SHARP LC-37GA8 - SHARP LC-32GA8 - HOW TO UPGRADE SOFTWARE - I2C METHOD

June 22, 2013, 4:48 am

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SOFTWARE UPGRADE [IIC-METHOD]

The hardware tools requirement are:

1. A Parallel port I2C interface with 20 pin to 3 pin cable (Sharp Code: CKIT-0004WJV0).

Make the connections as indicated below:

• Connect Parallel port I2C interface to LPT port of the computer.
• Connect the 20 to 3 pin cable from the I2C interface to the P2306 socket in the main board (XD603).

Before using I2C method is necessary to install Visual I2C software following next procedure.

• Install Visual I2C release V3.2.3b from file (“Setup_Visual_I2C_v3-2-3b8h.exe”).
• It’s strongly recommended to accept the suggested default folder (“C:\Program Files\Micronas\Visual I2C”).
• Install Visual I2C VCTp extension from file (“Setup_VI2C_for_VCT6wxyP_v0111.exe”).
• It’s interesting to change default folder to same as Visual I2C (“C:\Program Files\Micronas\Visual I2C”).  During this installation process is possible to install also a complementary software to manage NVM memories .
• This installation is not needed, for this reason uncheck the option when the setup program ask to you. In case of installation it’s interesting to change default folder to same as Visual I2C (“C:\Program Files\Micronas\Visual I2C”).
• Install Parallel driver depending of your Windows version from existing files inside the Visual I2C installation folder “C:\Program Files\Micronas\Visual I2C\Port_Driver”, following next criteria

[A] Windows 98/Me (“Setup_LptDrv_v0104_9x.exe”).

[B] Windows NT (“Setup_LptDrv_v0104_NT_2000.exe”).

[C] Windows Xp/2000 (“Setup_LptDrv_v020201_XP_2000.exe”).

After installing Visual I2C, the new generated file structure should look like this:

• Check installation LPT driver using “C:\Program Files\Micronas\LptDrv\LptDrvTest.exe”. After run this software, if LPT driver is installed properly must appear this screen

• If the result is not OK, check inside PC Bios:  Parallel Port Mode=EEP
• To run VCTp software update program, click over 'VCTP' icon from the 'Start\all programms\micronas\visualI2C\IC\VCTP and after Visual I2C finish their starting processes click on 'TVT' modlule.  As addisional method it is possible to create a direct access to C:\Program files\Micronas\Visual I2C\ic\vct6wxyP\vctq_tvt.vi2c and launch it from windows desktop.

To start updating process follow next instructions:

• Set Autoread in ON option.
• Click on “GO” button.
• Wait until “40” appears in Bootloader Version field.
• Close DOS pop up windows pressing any key (“Press any key to continue…”.).
• Click on the “Erase flash” button and wait for a seconds and set the AutoRead to OFF.
• Check in the desired software version is selected in the “Load BinàFlash” option. If it’s not the correct one, double click on the file name and select it. The first time this software is use it’s necessary to confirm write Addressing margin as from 0x0 to 0x7ffff.

• Click on the 'Load Bin -> Flash' to start updating process.

When updating process finishes, the ‘Progress’ pop up window automatically  closes.  If appears some problem during the updating process a error label appears in the file name information line.  If the TV has problem to enter in the ‘Bootloader mode’, it is possible to force it by hardware method.  This alternative method is described below.

1. Switch off the TV set, or hold VCTp RESET line to GND.
2. Pull down the SCL line [pin-1] to GND [pin-3] in P2306 connector.
3. Switch on the TV set or release VCTp RESET line.
4. Release SCL pull down after minimum of 2 seconds.
5. Check if VCTp is in Bootloader mode with Autoread setting in ON.
6. Follow the instruction from item 5 on software method.

Sometimes depending on the PC hardware, the progress bar runs very fast [Normal time: 1 minute], or some error message appears in the file-name information line.  This means it’s necessary to modify some parameter of LPT port, for this reason select ‘LPT Preferences’ on the ‘File\Preferences…’ menu and increase Delay from ‘0’ to ‘1’ or ‘2’.

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JVC LT-26B60BJ - LT-26B60BU - LT-26B60SJ - LT-26B60SU - HOW TO ENTER SERVICE MODE - LCD PANEL FAULTS - DOTS - FLICKER - MAIN POWER SUPPLY [SMPS] SCHEMATIC

June 22, 2013, 7:24 am

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SERVICE MODE

• Press [INFORMATION] key and [MUTING] key on the remote control unit simultaneously to enter the SERVICE MODE SCREEN.

SERVICE MODE SCREEN

• Press the [MENU]key to exit the Service mode.
• [FUNCTION ▲/▼ key : Select the SETTING MENU & ITEM
• [OK] key : Decision the SETTING MENU & ITEM
• CHANGE OF SETTING VALUE (DATA) => [FUNCTION ◄/►] key.
• The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.

SERVICE MODE SETTING ITEMS [OPTIONS]

LCD PANEL FAULTS

PIXEL FAULT:  There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.

BRIGHT FAULT:  In this pixel fault, a cell that should not light originally is lighting on and off.  For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.

DARK FAULT:  In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.  For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.

FLICKER FAULT:  In the pixel fault, a cell that should light originally or not light originally is flashing on and off.  For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on and off.

SMPS SCHEMATIC

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JVC LT-26C31BC - LCD TV - HOW TO ENTER SERVICE MENU - DEFAULT DATA VALUES

June 22, 2013, 10:20 pm

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SERVICE MODE

• Press the [INFORMATION] key and the [MUTING] key of the REMOTE CONTROL UNIT simultaneously, and the SERVICE MENU screen.
• When the Main Menu is displayed, press any key of the [1] to [0] key to enter the corresponding menu mode.
• Press any of the [1] to [0] keys before the Service Menu mode disappears.
• Select the service item using the [FUNCTION ▲▼ ]  key.
• Set the value using the [FUNCTION ◄►  key.
• Press the [OK] key to save the value.
• Press the [INFORMATION] key to exit the Service Menu mode.

SERVICE MENU SCREEN

SERVICE MENU SETTINGS

• IF (VCO adjustment, ATT setting) [Do not adjust].
• V/C (VIDEO setting).  [Do not change settings of items that are not included in the "ADJUSTMENT PROCEDURE".] Sets output data to the video circuit.
• [Function ▲▼ key].  For scrolling up/down the setting items.
• [Function ◄/► key].  For scrolling up/down the setting values.
• AUDIO (SOUND setting).  [Do not adjust]
• STATUS;  (The version of software, the aspect, and the state of debugging are displayed.)  [Setting for this item is not required in servicing]
• VNR (Noise reduction setting).  [Do not adjust] Sets output data to the digital noise reduction circuit.
• IP (DIST setting).  [Do not adjust] Sets output data to the DIST circuit.
• SHIPPING (OFF).  [Setting for this item is not required in servicing]
• BUE FREE.  [Setting for this item is not required in servicing]

SERVICE MENU

ADJUSTMENT LOCATIONS

DEFAULT DATA VALUES

• Perform fine-tuning based on the "default values" using the remote control when in the SERVICE MENU setting mode.
• The "default values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved may be different from the default values. But, don't change the values that are not written in "ADJUSTMENT PROCEDURE". They are fixed values.

Video System

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Audio System

EMERSON CR202EM8 - HOW TO ENTER SERVICE MODE - Initial Settings - SD-Check Mode - SOFTWARE RESET - INITIALIZATION - SMPS [POWER SUPPLY] SCHEMATIC - Universal Remote Control Set-up Codes

June 23, 2013, 4:05 am

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SERVICE MODE

How to make Service remote control unit by supplied remote control unit

• Prepare normal remote control unit. (Part No. NE601UE)
• Remove 3 Screws from the back lid.
• Add J1 (Jumper Wire) to the remote control CBA.

How to enter the service mode:

Use the service remote control unit.

• Turn the power on. (Use main power on the TV unit.)
• Press [SLEEP] button on the service remote control unit. Version of microcomputer will display on the CRT. (Ex: 058-0.06)
• Check the display on the lower left is “3641” and if it is not “3641,” set it at “3641” according to "Initial Setting"

INITIAL SETTINGS

• Enter the Service mode.
• Press [VOL n] button on the service remote  control unit. Display changes “C/D,” “7F,” “SOUND TYPE,” “VIDEO,” “1000,” “YUV MEMORY,” “TUNER A/M/S,” “QAM,” “DTV-H,” “D-SOUND,” and “DL V-CHIP” cyclically when [VOL n] button is pressed.

To set the following each data value, press [CH ▲▼] buttons on the service remote control unit.

• 7F --- Set to “FF.”
• SOUND TYPE --- Set to “MONO.”
• VIDEO --- Set to “V1/V2.”
• 1000 (monitoring time) --- Set to “1000.”
• YUV MEMORY --- Set to “OFF.”

TUNER A/M/S --- Set it by indication of TUNER as follows.

• UTUNATSMS001: Set it in “M.”
• UTUNATSSP001: Set it in “S.”
• QAM --- Set to “135.”
• DTV-H --- Set to “B.”
• D-SOUND --- Set to “STEREO.”
• DL V-CHIP --- Set to “ON.”

Setting for BRIGHT, CONTRAST, COLOR, S-COLOR, C-COLOR, TINT, V-TINT, S-TINT, C-TINT, SHARP, S-SHARP, and C-SHARP Data Values.

• Enter the Service mode.
• Press [MENU] button on the service remote control unit. Display changes “BRT,” “CNT,” “CLR,” “S-CLR,” “C-CLR,” “TNT,” “V-TNT,” “S-TNT,” “CTNT,” “SHARP,” “S-SRP,” and “C-SRP,” cyclically when [MENU] button is pressed.

CNT

• Press [MENU] button on the service remote control unit. Then select “CONTRAST” (CNT) display.
• Press [CH ▲▼] buttons on the service remote control unit so that the value of “CONTRAST” (CNT) becomes 84.

Use the same way as stated above, and adjust the values to the following

CLR => 58

S-CLR => 58

C-CLR => 66

TNT => 54

V-TNT => 58

S-TNT => 58

C-TNT => 59

SHARP => 43

S-SHARP => 40

C-SRP => 40

SD CHECK MODE

• Enter the Service mode.
• Press [1] button on the remote control unit. The unit enters the SD-Check mode.
• The unit starts selecting the added channel from the first channel according to the memorized CH ADD/DEL data and CATV/TV data in RAM.

SOFTWARE RESET

To reset software, press [5] button on the remote control unit for at least 5 seconds after pressing [CH RETURN] button on the remote control unit.

INITIALIZATION

To put the program back at the factory-default, initialize the television as the following procedure.

• Use the service remote control unit.
• Turn the power on. (Use main power on the TV unit.)
• Press [SLEEP] button on the service remote control unit to enter the Service mode. (Refer to “How to enter the Service mode” )
• Press [VOL▼] button on the service remote control unit twice, and confirm that OSD indication is “7F = FF.” If needed, set it to become “7F = FF” by pressing [CH▲/▼ ] buttons on the service remote control unit.
• Confirm that OSD indication on the four corners on TV screen changes from on and off light indication to red by pressing a [DISPLAY] button.  (It takes one or two seconds.)
• Turn the power off by pressing main power button on the TV unit, and unplug the AC cord from the AC outlet.

POWER SUPPLY [SMPS] SCHEMATIC

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UNIVERSAL REMOTE CONTROL SET-UP CODES

GE UNIVERSAL REMOTE: 0004 0009 0044 0135 0049 0051 0189 0053 0147 0039 0130 0227 0233 0250 0252 0254 0257 0265 0266 0310 0325 0456 0040 0041 0042 0021 0023 0024 0179 0045 0025 0027 0030 0032 0034 0035 0037

RCA RCR 311W: 1003, 1004, 1009, 1011, 1018, 1021, 1023, 1025, 1026,1028, 1030, 1031, 1033, 1035, 1038, 1039, 1041, 1045,1047, 1054, 1078, 1083, 1109, 1123, 1127, 1128, 1133, 1163, 1165, 1167, 1206, 1207, 1208, 1230

RCA RCR 312W: 10017, 10154, 10451, 10236, 10463, 10180, 10178, 10171, 11394, 11963

ALL OTHER BRANDS: 1051 1061 1075 10521091 1147 1195 1145 1120 1225 1012 1231 1002 1317 1032 1184 1298 1287 1288 1171

BEKO L6E – PE CHASSIS LCD – PLASMA - HOW TO ENTER SERVICE MODE - OPTIONS - Universal Remote Control Set-up Codes

June 23, 2013, 8:36 am

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SET APPEARANCE OF LCD & PLASMA

SERVICE MODE

• Service Menu is entered by pressing “9, 3, 0, 1” keys on the remote controller when the OSD Menu is Picture icon is highlighted in the Main Menu.
• Service Menu has 3 sub-menus. These are:

1. Adjustment
2. Selection
3. Option

Pressing OK button can do navigation through these menus. 

Every adjustment made in this menu is saved automatically.

ADJUSTMENT

FACTORY MODE: There are two (2) values for this adjustment “OFF” and “ON”. When “OFF” is set, the unit goes to stand-by at start up else the unit operates directly.

I2S PRESCALE:  This topic adjusts the level of the volume received via HDMI.

SCART PRESCALE:  This topic adjusts the level of Analog Stereo Sound at MSP Scart Audio inputs.

NICAM PRESCALE:  This topic adjusts the level of NICAM Stereo Sound at MSP IF Audio inputs.

FM/AM PRESCALE:  This topic adjusts the level of FM/AM Stereo Sound at MSP IF Audio inputs.

AGC: Adjusts the AGC(Automatic Gain Control) value.

WHITE R / WHITE G / WHITE B/ PIP WHITE R / PIP WHITE G / PIP WHITE B:  These are used for color bias adjustment. Unlike other items in the service menu, changes will take effect immediately.

SELECTION

FACTORY RESET: Resets all the values to factory values.

BACKLIGHT: Selects the backlight illumination level of the panel.

TUNER TYPE:  Selects the type of the tuner, should be selected parallel to the tuner used in the unit.

TELETEXT: Selects the Teletext type(No Text, Fast, Fast&Top).

TIMER MODE: If OFF TIMER is selected, the user will be able to enter time of the day info for the TV to switch off. If SLEEP TIMER is selected, the user can specify some time period, after which the TV will go to stand by automatically.

MSP CLIP: There are four (4) values for this topic, with “Reduce Vol” MSP output limiting is done by Volume, with “Reduce Tone” MSP output limiting is done by bass and treble, with “Compromise MSP output limiting is done by volume, bass and treble, and with “Dynamic” MSP output limiting is done automatically internal by IC.

HOTEL MAX VOLUME:  By this topic the volume level at Hotel Mode can be limited, also see HOTEL MODE under OPTIONS.

COUNTRY: Selects the Country.

OPTIONS

HOTEL MODE: Enabling Hotel Mode has two effects. First, SETUP menu is no longer accessible by the user. Second, maximum adjustable volume value is limited to HOTEL VOLUME value.

STDBY RECALL: If this Option is “OFF”, the TV will stay in Stand By mode when switched on. If this Option is “ON”, the TV will recall its last stand by status.

RECALL LAST AV: If this Option is “ON”, then the TV will recall the last AV mode when switched on, If this Option is “OFF” then will start up with standby.

MSP CAR. MUTE: If this option is “ON”, sound processor’s carrier mute functionality will be enabled. The MSP will mute the sound automatically if the signal quality is bad. Setting this option “OFF” will disable this function.

WSS RF: If this option is “ON”, TV automatically goes to WSS mode when recognized via RF. Setting this option “OFF” will disable this function.

AUTO AV 16:9: If this option is “ON”, TV automatically goes to 16:9 modes when recognized via AVs. Setting this option “OFF” will disable this function.

FIRST ATS: If this option is set to ON, TV will display Country Selection menu in the next start. After some country is selected, the user will be prompted for the start of Auto Programming process.

HEADPHONE: If the LCD consist Headphone this parameter will be opted as “ON” else “OFF”

PARENTAL LOCK: When “ON” set, then “Parental LOCK” is added at OSD.

SERVICE MODE ADJUSTMENT DATA

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SET-UP CODES [Universal Remote Controls]

049 085 086 090 108 117 130 195 225 250 255 263 296

0039 0101 0152 0163 0215 0241 0421 0433 0460 0465 0685 1203 1158 1147 1145 1061 1287 1012 1051 1093 1052 1180 1232 1435 1198 1068 1039 1101

AIWA TV - A-219 - SCHEMATIC DIAGRAM - Using ICs - STR-S6707 - NJM2904L – LA7565N – LA7832 – LA7956 – TDA2007A – LA7953 – TA8759BN – M37221M6-277SP – SLA24C-4-D

June 23, 2013, 11:17 am

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MAIN BOARD SCHEMATIC

CRT BASE BOARD

{Click on Schematics to Zoom In}

SUB-BOARD

AIWA SE2130 - SE1430 - SCHEMATIC [CIRCUIT] DIAGRAM - USED ICs TDA9367LW – TDA6107Q – 24C08EEPROM – TDA8357J – STR-F6653 – TDA9044J

June 23, 2013, 9:41 pm

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SCHEMATIC DIAGRAM

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SANYO CE30LC3-C - CE30LC3BK-C - HOW TO ENTER SERVICE MODE - OPTION SETTINGS - INITIALIZATION - ALIGNMENTS - Universal Remote Control Set-up Codes

June 23, 2013, 10:56 pm

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SERVICE MODE

• While pressing the green button on the remote control press the P▼ on the cabinet front.  The service menu appears.
• Use the P▲ or P▼ to highlight the service menu you require and press the F/OK button to enter.
• To ‘Exit’ Press the Menu button to navigate backwards through the service menus until menus disappear.

Do not attempt to adjust service adjustments not listed on the above otherwise it may cause loss of performance and product safety.

SERVICE MENU

OPTION SETTINGS

The memory IC, IC803, stores the option data of TV set and service adjustments data for each circuit, therefore, when the memory IC is replaced, it should be performed  following setting and “SERVICE ADJUSTMENT”

To enter to the Option Mode

• Press and hold the F/OK button on the remote control and P▼button on the front panel of the TV. The option window will appear on the screen.

                            OPTION MODE FOR CE30LC3-C-00 / CE30LC3BK-C-00

To set the option mode

• Highlight the desired option item by using  the P▲ or  P▼ button .
• To switch the option mode, use the Volume - (LEFT) or  Volume + (RIGHT)button.
• The data which is set in the option mode is stored into the memory IC automatically.

                      Following table shows the available option items and default setting mode.

• To Exit from the Service Mode Press the MENU button.

SERVICE ADJUSTMENTS

Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the adjustments are carried out by using the RC handset.

INITIALIZATION OF MEMORY IC

• To initialize the memory IC (IC803), press and hold the NORMAL button on the remote control, then press the P▼ button on the front panel of the TV set and then turn the Mains switch Off and On. The initialization is now completed.
• When initialized the memory IC and all of the setting data (option data and service adjustment data) stored in the IC are reset to the default value. It is necessary to set the option settings and readjust the service adjustments.

The available adjustment items are as follows;

TDA9885 : This can be adjusted for AGC.

Video : This can be adjusted for the service adjustment.

DO NOT ADJUST OTHER SETTINGS

After replacing the Memory IC (IC803)

The memory IC, IC803, stores the service adjustments data for each circuit, therefore, when the memory IC is replaced, using “OPTION SETTING” on previous page and the following adjustments should program it.

Service menu: Video

• Enter the service adjustment menu as described on the previous page and select “Video” using the P▼or P▲ buttons and then press the F/OK button to enter.
• Use the P▼ or P▲ buttons to select the option, and then press the F/OK button on the remote control to enter.

Service menu: Sound

• Enter the service adjustment menu as described on the previous page and select “Sound” using the P▼ or P▲ buttons and then press the F/OK button to enter.
• Use the P ▼or P▲ buttons to select the option, and then press the F/OK button on the remote control to enter.

Service menu: TDA9885

• Enter the service adjustment menu as described on the previous page and select “TDA9885” using the P▼ or P▲ buttons and then press the F/OK button to enter.
• Use the P▼ or P▲ buttons to select the option, then press the F/OK button on the remote control to enter.

TDA9885

Write 1         70

Do not attempt to adjust the following service adjustments except when adjustments are required in servicing otherwise it may cause loss of performance and product safety.

AGC ADJUSTMENT

• Select the clearest VHF station
• Connect a digital voltmeter to test point TP-A and GND  
• Enter service menu : TDA9885
• With the P▼ or P▲ buttons select “Write 1”
• Adjust using the Vol ▼ or Vol  ▲ buttons until the readout from the voltmeter is 3.2 VDC.

GREY SCALE ADJUSTMENT [SCREEN ADJUSTMENT]

• Make sure the set is warm (20 mins)
• Receive Black and White picture/pattern
• Enter service menu “Video”
• Select item “White Point R” or “White Point B”
• Using the Vol +  or Vol - buttons adjust to make the white, white.

HORIZONTAL ADJUSTMENT [HORIZONTAL CENTRING ADJUSTMENT]

• Set wide screen mode to “FULL”.
• Preferably receive a circular pattern
• Enter service menu “LCD Parameters”
• Use the P▼ or P▲ buttons to highlight “H Display start”.
• Press the Vol ▲  or Vol ▼  buttons to adjust horizontal centre.

VERTICAL ADJUSTMENT [VERTICAL CENTRING ADJUSTMENT]

• Set wide screen mode to “FULL”.
• Preferably receive a circular pattern
• Enter service menu “LCD Parameters”
• Use the P▼ or P▲ buttons to highlight “V Display start”
• Press the Vol ▼ or Vol ▲  buttons to adjust the vertical centre.

Universal Remote Control Set-up Codes

GE Universal Remote: 0049 0097 0110 0004 0268 0012 0108 0180

RCA RCR 311W: 1047, 1078, 1080, 1121, 1129, 1163

RCA RCR 312W: 10054, 10154, 10159, 11142 

{Others} 0018 0020 0041 0049 0050 0065 0101 0102 0107 0131 0139 0152 0161 0166 0177 0181 0195 0198 0209 0215 0314 0320 0379 0391 0408 0421 0634 0660 0667 1073 1079 1069 1072 1145 1423 10611178 1047 1171 1298 1316 1347 1349 1143 1157 1172 1208 1360 1024 1115 1052 1232 1046

007 014 020 032 033 051 052 074 086 087 108 123 159 189 218 221 249 286

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HORIZONTAL OUTPUT TRANSISTOR BLOWS UP - REASONS (CRT Based TVs)

June 24, 2013, 2:21 am

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The reasons for this fault are:

• Over voltage from SMPS power regulator. 
• Line Output Transformer’s winding short [Internal]. 
• Frequency of horizontal oscillator is very high than normal.
• An defective free-wheeling capacitor connected between the collector of horizontal output transistor to GND.
• A solder loose to the above said capacitor.
• Shorted winding inside the defection yoke [Horizontal deflection winding]
• A loosely fitted horizontal output transistor to metal heat sink.

   Always sit for work with the schematic diagram of the TV you want to repair.   
   Assuming that the SMPS section circuit works normally, we can check this voltage for no load to confirm it is OK.  In most TVs, this secondary main output voltage will be within the range of [90 to 135VDC], and must be stable too.  It should not vary with time.  To check this, locate the smoothing capacitor to this main voltage at the secondary side main supply voltage. The value to this capacitor will be within 100 to 220MFD, 160VDC.  This voltage is fed to the LOT winding, and is supplied to the collector of the horizontal output transistor.  Either disconnect the supply to LOT , or de-soder out the horizontal output transistor from circuit.  Thus, we get an open [No Load] voltage point across the secondary main voltage, across its filter capacitor. Solder two wires from the to terminals of this smoothing capacitor, and connect it with a bulb holder.  Insert a [100W 220V Filament Type] bulb.  Never use CFL or like other as load.

   Plug the TV to AC power, and switch it on.  If the voltage is there, the bulb will glow faintly [at about half its intensity].  All the other low voltages from the SMPS will be present.  The power LED at the front panel of the TV (If any) will glow, indicating that the standby voltage [5VDC] is present.  Measure the voltage across the connection that we have connected with the bulb. It should be correct as specified in the service manual.  Keep the set in this condition, for at least 5 minutes, and check the voltage again,  It shouldn't vary by any means.  0.3VDC difference is allowed.  It is OK, but if it varies by 2VDC or more during this time, the power supply is not stable.  Check all the components at the power control side.  Be sure to wear surgical gloves, when you work with the primary side of the SMPS power supply, because all the points at that side will be HOT. Refer to service manual for details about the components used at this stage circuits, and be sure to replace the same type and number; if a replacement is needed.  If there is no voltage variation to the secondary power supply noted, we could go to next stage of troubleshooting.

   Check all the solder terminals at the horizontal output stage.  Practically, it is not possible to detect these loose solder terminals, as they will be microscopic in nature, that we can’t detect it  without using a magnifying glass.  It is best to re-solder all the suspected solder terminals, by applying a little more solder to each terminals, without making any solder bridge short in between adjacent solder points.

   If the horizontal output transistor found Leakey, that is, its collector to emitter junction shows a dead short [less than 1Ohms], the free-wheeling capacitor should be suspected.  It is a best practice to replace it too along with new horizontal output transistor.  The capacitance value to it can be vary by 3900 to 9500Pf 2000VDC according to different manufactures.  Make sure when you replace it that the value presently used must be the value to the replacement, because, this capacitor has an important role in generating EHT, Focus voltage etc:- More over, it determines the width of the picture.  If you use one that has a capacitance value more than that of used one , the EHT and Focus voltage will decrease, and the picture will look larger than normal.  If it goes down, the EHT and focus voltages will get high, which in turn cause arcing to take place inside the CRT gun as well as failure to horizontal output transisor.  In some sets, an other capacitor with a very low capacitance; say [470Pf 200VDC or so] value, too will be connected in parallel to this free-wheeling capacitor.  If there is such, replace it too. Note the value of this capacitor; especially when you service Samsung Brand CTVs; because, Samsung do not use any heat sink to the Horizontal Output Transistor.  When you replace any component to the Samsung TV circuit, It must be the original type and number used. If improper replacement have done to Samsung circuit, frequent failure of horizontal output transistor will be the result.

   Then comes the problem of winding short, inside the LOT.  Normally, we can’t measure this by ordinary methods,  The EHT winding inside the LOT have several turns of very thin copper wire.  Even a short to its single turn, will cause to put a heavy load to horizontal output transistor, and the transistor will heat up.  It will heat up to a temperature, that we can’t even touch it by bare finger. Finally, it’s collector to emitter junction will get shorted.  Just see, here , by schematic, the collector to this transistor is connected to +B voltage, via the windings of the LOT, and its emitter is connected to Gnd.  So, if this transistor shorts, means, a direct short to +B supply to Gnd.  With most of modern circuits, there the SMPS supply circuit will have a short circuit protection facility, and it will detect any short circuit to the secondary DC outputs, and send a message to the main system control, which in turn shut off all the functions of the SMPS oscillator and control.  The set will remain dead, as a fuse failure, but not.  So if you get a set in dead condition, first check whether the AC mains fuse has blown up.  If it has blown, make sure that the fault lies within the SMPS regulator control section [HOT] side, and not with the secondary side.  If fuse is found opened, check all the components at the main power regulator section.  Suppose; during checking, you've found one among the four rectifier diodes have shorted.  Do not replace the damaged one only.  Replace all the four [In some sets, a rectifier stalk will be used].  
   The best way to troubleshoot for a dead set is, first check the mains fuse.  If it is found OK, de-solder out the horizontal output transistor.  Plug the TV to AC mains, and switch it ON.  If the failure is only with the horizontal output transistor, the power supply will switch On, and standby light will glow. This is true to all local CTV kits [Chinese].  Then find out the reason for the blow up of the horizontal output transistor.  In some cases, a loosely fitted transistor to heat sink metal plate might be the trouble.  When replacing the horizontal transistor, be sure to fix it firmly.
   If LOT is suspected, the only way to check it is to switch ON the TV; after replacing all the damaged components; set for a very short time, say, for 5 seconds or so, and switch it OFF.  Feel the temperature of the horizontal output transistor by bare fingers after disconnecting the AC cord from AC Mains Socket.  It can be just warm, but not too hot. If LOT is faulty, the horizontal output transistor will heat up much within this time period.  If so, you have to replace the LOT too.
   If the horizontal oscillator frequency shift beyond limit, the horizontal output transistor will fail.  To make it sure, before inserting the transistor  check the frequency at the base terminal of this transistor with a multimeter have frequency measure range.  Check the frequency, either at the base terminal of the horizontal output transistor  or at the collector terminal of the horizontal drive transistor.  It should measure within the range of 15KHz.  If not, make sure that the horizontal oscillator stage is faulty.  In most modern one chip circuits, this section is within the main IC, and the replacement of that IC is the only remedy, no repair to it.
   Shorted winding inside the deflection yoke is a very rare case; one out of thousand; but could happen and can be measured by taking the resistance of the horizontal winding terminals.  Resistance value of this winding will be below [3-Ohms] to most television    In most case, the failure to horizontal output transistor will be the reasons as described above.  Troubleshooting to any equipment is an art.  A deep knowledge in the subject won't help anybody to to do a repair work too easily   Practical experience will do much.  [An Ounce of Practical Experience is more than a Ton of Theory].

HOW TO DIAGNOSE A FAILED T'CON BOARD - HOW TO REPLACE A T'CON BOARD

June 24, 2013, 7:34 am

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T'Con boards
Sony T'Con board

Samsung T'Con board

DIAGNOSING A FAILED T'CON BOARD

   All video inputs received by the video process circuits are handled on a frame-by-frame basis.  The video frames are converted and scaled to 8 to 10 bit RGB information.  It is virtually impossible for the video process circuit to cause a problem on a specific area of the screen.  Failures on this board usually appear as distortions, color level shifts, video level shifts or noise that involves the entire picture.  The T’Con can generate symptoms that appear to be video process related, but the video process circuit cannot produce the symptoms of a failed T’Con board circuit.
T'CON FAILURES

   Failures in the timing control circuits of the T’Con can produce symptoms of absolutely no video or generate lines and patterns that usually cover all or a substantial part of the screen.  Determining if the T’Con is the cause of a ‘No Video’ condition is a bit more difficult since there are no indications on the screen to analyze. Many of the Sony TV models ove the last few years will detect a T’Con that has completely failed.  The communications data between the video process circuits and the T;Con will cease to communicate, iif the T’Con fails completely.  This will cause the TV to shut down and display a diagnostic code, indicating a failure of the T’Con.  Not all chassis designs have this feature and it is not found on older models.  The typical scenario when this failure arises is for the technician to bring a video process board to the repair location.  It is usually safe to assume that the problem lies on the T’Con board, if the replacement video board dos not give a solution to the problem since it is highly unlikely that a replacement board with the same failure was received.  One trick to check most T’Cons for functionality is to loosen the LVDS connector at the T’Con while unit is turned ON.  Handle the LVDS connector with care and be certain to fully release the lock tabs.  Gently rock the cable in and out of the connector while observing the screen for any response.  Depending on the chassis, the symptoms of the screen ma be gentle white flashes, intermittent coloured lines, or a screen full of random patterns.  The idea at this point is to provoke some kind of response on the screen.  Another helpful procedure is to rapidly heat and/cool the T’Con with a hot air devices or circuit coolant and watch for patterns appear on the screen. 

LVDS cable failures

Although the problem with LVDS cable or connectors can generate symptoms of T’Con failures this usually tends to be intermittent and wiggling of the connectors will usually provoke  a change in the symptom on the screen.  LVDS cable and connectors have became rather robust over the past few years.  Technicians who damage them cause most problems and this is generally quite oblivious upon close examination.

LVDS CABLE

LCD panel failures

Some LCD panel failures could possibly mistaken for T’Con board issues.  Other than damage to the LCD glass, most panel failures are isolated to a particular area of the screen.  Since the T’Con disperses the pixel data to groups of line and column dirve IC’s situated on the outer edges of the panel, it is unlikely that more than one of these IC’s would fail at the same time.  Multiple columns of struck on or stuck off pixels are therefore, more likely to be the fault of the T’Con circuits.  The same applies to a single row of lit or unlit pixels.  The T’Con simply cannot cut out a single line of information.

T'CON REPLACEMENT

   In many instances, replacement of the T’Con board will be relatively straight forward.  In some case, the other boards may have to be loosened or removed to allow access to the mounting screws and clearance to remove the T’Con board.  The issue of most concern is keeping track of the heat transfer pads, stand offs and insulators.  The T’Con is heavily shielded and it si ease to have one or more of these components accidentally fall out of the assembly when removing.  T’Con assemblies that use multiple heat transfer pads must be removed slowly and every attempt must be made to keep the shield and circuit board together as they are removed from the unit.  Check for any service bulletins pertaining to the model and panel design that contain the subject lie of ‘T’Con heat transfer pad locations’ for pictures to show the proper location of these components.  This site itself has covered disassembly procedure to some model LCD TVs, here.  Pull up older posts here, or see the site in Timeslide option, which can be accessed by the drop down  at the top left side of the display window.  It will make search the easily.

Remove the screw from the LVDS cable ground strap so the cable can be moved away.  Unplug the connector to inverter board and remove harness from the retainer.  Remove all screws securing the board sub-chassis to the panel.  Pull the top of the board toward you and downward to allow access to the bottom screws securing T’Con.  The position of screws, and disassembly method may vary set to set.

   Carefully unpeel the conductive tape from the top bracket taking care not to tear them.  Leave the tape attacked to the T’Con shield.  Remove the top bracket covering the gate and source driver components.  This will allow access to the upper flat cable connectors, if any.  Carefully lift the locking tabs securing the flat cables.  Leave the fat cables attached to the T’Con and shield ass;y.  the T’Con board will have an insulating pad between it and the LCD panel that will cause the board to stick.  Not much effort is required to release it.  The goal at this point is to remove the board and shield together so as to avoid dropping heat transfer pads and insulators located between the front of the board and the shield.  If successful, Both components should stay together as insulated.  Note the spaces mounted on the backside of the board.  These will need to be transferred to the replacement board.  Lift the circuit board upward slowly while observing the location of the heat transfer and insulating pads.  In most cases the heat transfer pad will remain attached to their appropriate ICs and the insulating pads will be struck to the shield.  If anything falls off, use the instruction to return them to their proper position.  Transfer all heat and insulating pads along with the flat cables to the replacement board.  Once the components have been transferred to the front of the circuit board, attach the shield and flip the assembly.  Transfer any spacers or insulating pads to the replacement bard.  Temporarily secure the T’Con board to the shield with electrical tape.  This helps in preventing movements of the circuit bard while installing the assembly back into the LCD panel.  Once the T’Con ass’y is secured to the panel, insert and lock the flat cables.  Plug in all connectors and secure the board sub chassis.  Do not forget about the wire harness that was removed from its retainer.

HOW TO TROUBLESHOOT PLASMA TVs - Part of the screen do not work - Vertical & Horizontal lines - Refuse to switch ON etc:

June 25, 2013, 12:44 am

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HOW TO TROUBLESHOOT - WORKING PRINCIPLE 

The idea of plasma display is to illuminate a colored substance to form an image.  You see on the screen is burning gas between to pieces of glass. The gas is neon or xenon.  The estimated life span of a plasma display is 45,000 to 60,000 hours.  The serene contains a complex structure, has millions of colored pixels.  Each of these pixels are powered by tiny electrodes, has ists own gas and color. Each one controlled by brightness and color.  It is plasma display.  Usually plasma display problems start with its screen.  If a plasma screen is broken or crashed, it is not repairable by no way.  It needs a new screen replacement, which might cost around 2/3^rd of the total cost of a new plasma TV.  The front protection screen glass can be replaced and is not so expensive.  If you have just a protection screen damage problem, after the replacement of the same, TV will work without any problem.  Plasma screen have aluminum base, and two pieces of glass with gas in between them.  The gas is not rechargeable.  Pixels with gas, controlled by tiny electrodes. Each pixel contains three colored sub pixels of Red, Green & Blue.  The plasma screen works in two steps. [1] Gas ignition [2] Picture reproduce.

Ignition => power supply => logic control => Z or X sustain => screen.

Picture => power supply => video control board [otherwise called as scaler] => logic control board => Y-sustain => X-sustain => buffer boards => screen.

Defects to screen.

Flashing red dots or pixels on the screen when it is cold.  even though after some time it might disappear.

Color distortion at one part of the screen, either be its left or right corner.

Colored vertical line/s on picture

Flashing red dots on some part of the screen, or all around.

BURN IN IMAGE

This is an image you notice on top of the normal picture.  It is usually displayed as dark lines or dark area on the screen.  The static [still] image display for along time will develop burn-in spots.  This is not a repairable issue.

VERTICAL/HORIZONTAL LINES/BAR

The problem might be due to a dead driver [part of the screen], or poor connection between plasma glass and ribbon wire connector. PDP panel and address driver on it are not separated.  If one of drivers is going out, need a new screen replacement. Defective buffer boards cause other common problem with lines on screen.  Voltage needed to operate controllers on buffer is high for a small SMD IC.  They are mot strong enough to drive address electrodes.

Plasma TV is a very hard working device.  It is working harder than any other TV, which has been built before, and produces a lot of heat. Overheating causes 80% of technical problems to it.  If there is no active cooling system, most of the plasma TVs will die in the first 3 to 6 years. After about 5 hours of work without cooling system some of the components on power supply regulator board were out of temperature balance.  Vs voltage changes up to 2 or more volts.  This may lead to overheating problem and cause other permanent damages.

POWER SUPPLY

In a plasma TV, it develops voltage to supply all the components, high current-high voltage.  Input fuse is of 10 Amps, with not so many TVs in TV history use input fuse of 10Amps.  Very sensitive for input AC voltage and output DC voltage.  It is a good idea to check the electric outlet, before hook up the plasma TV. All connections should be perfect in all respect.  A sparking electric plug connection can damage the TV.  Never use chap extension cords, and very old electrical connections.  Keep in mind that the plasma needs twice as much input current.  Common power supply problems are:

Hard to turn ON.

Stops working after a while.

Does not turn ON at all.

Flashing pixels on screen.

LOGIC CONTROL, X,Y USTAIN & BUFFER BOARDS

Controls picture, fires the gas, and many other functions.  Common problems include negative image, no image, vertical or horizontal stripes on picture, turns ON and OFF, and many more.

CARE

Cooling system.

Good electrical plug & connections without any loose contacts.

Do not leave the TV on one channel for a long time, say  2 to 6 days.

Do not use plasma TV on the same electric line with other powerful units, such as electric motors, electric cutters, welding equipments etc:

Standard companies build their own product, there own components, and have there own design.  So when you determine to buy a plama TV, care the Brand you’re looking for.  Never choose it from exotic companies, as they do copy and paste.

PLASMA TV FAILURE SYMPTOMS

No power supply  => Power supply.

Hard to turn ON. No power light on front panel. => Stand-by power supply.

Power turn On after 20 minutes of so.  Turn ON and shuts dow immediately. => Stand-by voltage. 

Flashing pixels on screen.  Turn ON, but no video and sound. => Board.

Negative image.  TV turns ON and shuts down in 2 seconds, or Z flashing pixels on screen.  Dark image => X or Y sustain board.

Has sound, but no picture.  Screen goes blank and then return to normal picture.  Vertical color lines on the screen, no video. Vertical color lines along with video.  Vertical bars on screen.  Horizontal lines on image.  Picture turns ‘Red’ after a while  => Sustain boards should be checked.

Left part of the screen only works.  Right part of the screen only work. = > Logic board

Vertical & Horizontal lines on screen.  Part of the screen do not work.  Some functions do not works. No video, but has sound. => Control board.

Part of the screen not working.  Black vertical bars on screen.  Burning smell. Vertical color line size changes.  White or colored horizontal lines => Buffer Boards.

No video from one of the inputs.  No sound.  No video, but have Menu lettering on screen. Some channels not working properly.  Snow on screen, no video at all. A gray colored screen try to shut OFF. Picture gets distorted after a while.  Intermittent sound.  Want to bring Menu on screen but shuts down for no reason.  Dark image on part of the screen.  =>  Audio/video main board.

Burn-in image.  Static image from previous seen channel or show.  Clears in few minutes.  Turn ON and shuts down.  Flashing red dots when it is cold.  intermittent change of colors => Plasma Panel.

ROLSEN RL-32B01 - RL-37B01 - RL-42B01 - HOW TO ENTER SERVICE MODE TRPUBLESHOOTING - HOW TO UPGRADE THE SOFTWARE

June 25, 2013, 6:21 am

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SERVICE MODE

• Use the remote control, first open MAIN MENU with MENU button, and choose SOUND with the CHANNEL ▲/▼ button, then choose the BALANCE with VOLUME ▲, while Balance value is 0, press 0-5-3-2, to enter factory menu.

FACTORY MENU DISPLAY

TROUBLESHOOTING

Number	Trouble	Measure
1	Turn on the TV, The LED is red, no display on screen.	Replace the main board or update the software.
2	Turn on the TV, The LED is blue, but no picture or/and no sound	Replace the main board.
3	In TV state, tuning is not possible.	should replace the main board.
4	No teletext	should replace the main board.
5	No sound	should replace the main board.
6	can not to update software	should replace the main board.
7	No reaction with PC	should replace the main board.

SOFTWARE UPDATE PROCEDURE

Connect the Debug board to the TV use VGA interface, and then connect the Debug board to the computer.

Set the ISP_TOOL4.0.9 ---- only for the first time update.  DLPORTIO.dll and FTD2XX.DLL must be in the same folder.

Find the folder where the ISP_TOOL4.0.9 lies in. [Note: DLPORTIO.dll and FTD2XX.DLL must be in the same folder.]

Double click the ISP_TOOL4.0.9 icon, and then a dialogue will show.

Click the Config button. And then a dialogue will show as below. You should set the Config like what the picture shows.

After you have finished all above, you should click the Apply button to complete the configuration.

Turn on the TV, then we can update.

Double click the ISP_TOOL4.0.9icon, and then a dialogue will show as below.

Click the Read button. And then do as shown

Find the update file in your computer.

Double click the update file. A dialogue will show as below.

Click the Connect button. And then do as shown below.

Click the Run button.

When the update is finished, a dialogue will show as below.

MAIN BOARD

POWER BOARD [LCD3707]

POWER BOARD [LCD4007]

MITSUBISHI LT-40133 - - LT-52144 - LT-52244 - ERROR CODES - HOW TO RESET - OPTION MENU {Click on Pictures to Magnify}

June 26, 2013, 12:43 am

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APPLICABLE TO LT-40133 - LT-46133 - LT-52133 - LT-46144 - LT-52144 - LT-40134 - LT-46244 - LT-52244

ERROR CODES OPERATIONAL CHECK
The TV must be in “Shut Down” and not have been switched OFF, to perform the Error Code Operational Check. When the TV is switched OFF, the code automatically resets to “12” No Error.

• Pressing the front panel “INPUT” and “MENU” buttons at the same time, and holding for 5 seconds, activates the Error Code Mode.
• The “POWER LED” flashes denoting a two digit Error Code, or indicating no problem has occurred since the last Initialization.

Note: The front panel buttons must be used, NOT those on the Remote Control.

The number of flashes indicates the value of the MSD (tens digit) of the Error Code.

The flashing then pauses for approximately 1/2 second.

The LED then flashes indicating the value of the LSD (ones digit) of the Error Code.

The Error Code is repeated a total of 5 times.

EXAMPLE - When the error code is 35, the LED flashes.

RESET & INITIALIZATION

• Many customer generated symptoms, intermittent symptoms or no symptom found can be resolved by using the various Reset and Initialization options. Before visiting the customer’s home ask the customer 1^st to try the System Reset button on the control panel and if this does not resolve the issue, then they can perform an A/V Reset by pressing the Guide+ Format buttons on the front panel at the same time. Then, if necessary, perform a user level Initialization by pressing MENU-123-ENTER with the remote. The customer should be made aware when settings and/or options will be reset. For more information, see the chart below.
• During Initialization, the set will reboot. Wait until the Power LED stops flashing before unplugging or powering ON the TV.

RESET / INITIALIZATION GUIDE

Initial Settings

OPTION MENU

• Press the “MENU” button on the remote hand unit.
• Press the buttons “2”, “4”, “7” and “0” in order. (The screen will change to the option menu.)

Item Description

Initial - Resets Settings

Power Restore - Power Restore ON/OFF

Netcommand Software - Displays software version

Digital Signal Strength - Digital Signal Data (not for analogue sources)

DIGITAL SIGNAL STRENGTH

• Tune to a Digital Channel
• From the Option menu scroll down and highlight Digital Signal Strength
• Press Enter.

A/V INITIAL SETTINGS

NORMAL & ABNORMAL LED INDICATIONS

POWER/TIMER LED	STATUS LED	CONDITION
Off	Off	Off (standby mode)
Blinks Blue (Fast)	Off	Initializing (10~65 seconds) (AC off)
Blue	Off	Power On
Blink Blue (Slow)	Off	Power On Timer is set
Off	Blinks Red	Fan stopped (LT-46244/LT-52244 Only)
Off	Red	Circuit failure (short) * LCD PON-short or Inverter short * LVDS cable disconnected, chassis to panel.

HOW TO DISASSEMBLE [OPEN] - MITSUBISHI -LT SERIES LCD TELEVISIONS [Click on Pictures to Zoom]

June 26, 2013, 3:29 am

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40 & 46" MODELS [LT-40133 - LT-40134 - LT-46133 - LT-46144 - LT-46244]
Back cover removal

• Remove 24 screws (A) from the back cover ((21 screws on 40” models).
• Pull the back cover from the TV.

52" MODELS [ LT-52133 - LT-52144 - LT-52244 ]

STAND REMOVAL

• Lay the unit face down on a soft non-scratching surface.
• Remove 4 screws (B)
• Pull the stand from the bottom of the unit.

WALL MOUNTING BRACKETS REMOVAL

• Remove 8 screws (D) (4 on 52” models).
• Lift the mounting brackets from the unit.

CHASSIS & STAND HOLDER REMOVAL

1. Remove 6 screws (A).
2. Remove two screws (B). (40 & 46 inch models only)
3. Unplug all inter-connecting cables and lift the chassis from the unit.

• Remove screws (c).
• Lift the stand holder from the unit.

PWB-DM COVER REMOVAL

• Remove screws (F) to remove the LVDS Cover.
• Remove screws (E) to remove the DM-COVER and EARTH PLATE.
• Lift the PWB-DM Cover from the unit.

PWBs - POWER, SIGNAL & DM REMOVAL

• PWB-POWER remove (10) screws (D).
• PWB-SIGNAL remove 6 screws (C).
• PWB-DM remove 3 screws (A) from the end bracket and service connector cover, and screws (B) from the PWB-DM.

NOTE: Additional disassembly required in LT-52244

LT-46144, LT-46244, LT-52144 & LT-52244 PWB-DM Removal

• Remove 4 screws (C) to remove the shield top.
• Remove 3 screws (A) from the end support plate.
• Remove 12 screws from the PWB-DM
• Carefully lift the PWB-DM from the unit.

PWB-DM End Support Plate Removal

• Remove two hex nuts (G).
• Remove 5 screws (H) from the end support plate.
• Pull the support plate away from the DM.

HOW TO LOCATE ELECTRICAL SYSTEM FAULT TO FORD MONDEO [Click on Pictures to Zoom]

June 26, 2013, 6:09 am

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ELECTRICAL SYSTEM TROUBLESHOOTING HINTS

• Before attempting to diagnose an electrical fault, first study the appropriate wiring diagram, to obtain a complete understanding of the components included in the particular circuit concerned. Noting if other components related to the circuit are operating properly can narrow the possible sources of a fault down. If several components or circuits fail at one time, the problem is likely to be related to a shared fuse or earth connection.
• Electrical problems usually stem from simple causes, such as loose or corroded connections, a faulty earth connection, a blown fuse, a melted fusible link, or a faulty relay. Visually inspect the condition of all fuses, wires and connections in a problem circuit before testing the components. Use the wiring diagrams to determine which terminal connections will need to be checked in order to pinpoint the trouble spot.
• The basic tools required for electrical faultfinding include a circuit tester or voltmeter (a 12-volt bulb with a set of test leads can also be used for certain tests); an ohmmeter (to measure resistance and check for continuity); a battery and set of test leads; and a jumper wire, preferably with a circuit breaker or fuse incorporated, which can be used to bypass suspect wires or electrical components.  Before attempting to locate a problem with test instruments, use the wiring diagram to determine where to make the connections.
• To find the source of an intermittent wiring fault (usually due to a poor or dirty connection, or damaged wiring insulation), a “wiggle” test can be performed on the wiring.  This involves wiggling the wiring by hand to see if the fault occurs as the wiring is moved.  It should be possible to narrow down the source of the fault to a particular section of wiring. This method of testing can be used in conjunction with any of the tests described.
• Apart from problems due to poor connections, two basic types of fault can occur in an electrical circuit - open-circuit, or short-circuit. 
• Open-circuit faults are caused by a break somewhere in the circuit, which prevents current from flowing. An open-circuit fault will prevent a component from working.
• Short-circuit faults are caused by a “short” somewhere in the circuit, which allows the current flowing in the circuit to “escape” along an alternative route, usually to earth. Short-circuit faults are normally caused by a breakdown in wiring insulation, which allows a feed wire to touch either another wire, or an earthed component such as the body shell. A short-circuit fault will normally cause the relevant circuit fuse to blow.

FINDING AN OPEN-CIRCUIT

• To check for an open-circuit, connect one lead of a circuit tester or the negative lead of a voltmeter either to the battery negative terminal or to a known good earth.
• Connect the other lead to a connector in the circuit being tested, preferably nearest to the battery or fuse. At this point, battery voltage should be present, unless the lead from the battery or the fuse itself is faulty (bearing in mind that some circuits are live only when the ignition switch is moved to a particular position).
• Switch on the circuit, then connect the tester lead to the connector nearest the circuit switch on the component side. 12 If voltage is present (indicated either by the tester bulb lighting or a voltmeter reading, as applicable), this means that the section of the circuit between the relevant connector and the switch is problem-free.
• Continue to check the remainder of the circuit in the same fashion.  14 When a point is reached at which no voltage is present, the problem must lie between that point and the previous test point with voltage. Most problems can be traced to a broken, corroded or loose connection.

FINDING A SHORT-CIRCUIT

• To check for a short-circuit, first disconnect the load (s) from the circuit (loads are the components which draw current from a circuit, such as bulbs, motors, heating elements, etc).
• Remove the relevant fuse from the circuit, and connect a circuit tester or voltmeter to the fuse connections.
• Switch on the circuit, bearing in mind that some circuits are live only when the ignition switch is moved to a particular position.  18 If voltage is present (indicated either by the tester bulb lighting or a voltmeter reading, as applicable), this means that there is a short-circuit.
• If no voltage is present during this test, but the fuse still blows with the load (s) reconnected, this indicates an internal fault in the load (s).

TO FIND AN EARTH FAULT

• The battery negative terminal is connected to “earth” - the metal of the engine/transmission unit and the vehicle body - and many systems are wired so that they only receive a positive feed, the current returning via the metal of the car body. This means that the component mounting and the body form part of that circuit. Loose or corroded mountings can therefore cause a range of electrical faults, ranging from total failure of a circuit, to a puzzling partial failure.  In particular, lights may shine dimly (especially when another circuit sharing the same earth point is in operation), motors (eg wiper motors or the radiator cooling fan motor) may run slowly, and the operation of one circuit may have an apparently-unrelated effect on another. Note that on many vehicles, earth straps are used between certain components, such as the engine/transmission and the body, usually where there is no metal-to metal contact between components, due to flexible rubber mountings, etc.
• To check whether a component is properly earthed, disconnect the battery, and connect one lead of an ohmmeter to a known good earth point. Connect the other lead to the wire or earth connection being tested. The resistance reading should be zero; if not, check the connection as follows.
• If an earth connection is thought to be faulty, dismantle the connection, and clean both the body shell and the wire terminal (or the component earth connection mating surface) back to bare metal. Be careful to remove all traces of dirt and corrosion, and then use a knife to trim away any paint, so that a clean metal-to-metal joint is made. On reassembly, tighten the joint fasteners securely; if a wire terminal is being refitted, use serrated washers between the terminal and the body shell, to ensure a clean and secure connection. When the connection is remade, prevent the onset of corrosion in the future by applying a coat of petroleum jelly or silicone-based grease, or by spraying on (at regular intervals) a proprietary ignition sealer such as Holts Damp Start, or a water dispersant lubricant such as Holts Wet Start.

FUSES, RELAYS & TIMER MODULE TESTING

• Fuses are designed to break a circuit when a predetermined current is reached, in order to protect components and wiring which could be damaged by excessive current flow.  Any excessive current flow will be due to a fault in the circuit, usually a short-circuit. The main fuse box, which also carries some relays, is located inside the vehicle below the facial panel on the passenger’s side, and is accessed by a lever behind the glove box.

MAIN FUSE BOX LAYOUT

1. Fuse/relay removal tweezers
2. Diode
3. Multi-plug connections.

AUX: FUSE BOX LAYOUT

1. Fuses 1 to 3
2. Fuses 4 to 8, 11 to 14
3. Relays R2, R5 and R6
4. Relays R7 to R11
5. Relay sockets for relays R1 and R4
6. Diode

• A central timer module is located on the bottom of the main fuse box. This module contains the time control elements for the heated rear window, interior lights and intermittent wiper operation. The module also activates a warning buzzer/chime when the vehicle is left with the lights switched on, or if a vehicle fitted with automatic transmission is not parked in position “P”.
• The auxiliary fuse box is located on the front left-hand side of the engine compartment, and is accessed by unclipping and removing the cover. The auxiliary fuse box also contains some relays (see illustration). Each circuit is identified by numbers on the main fuse box and on the inside of the auxiliary fuse box cover
• Plastic tweezers are attached to the main fuse box and to the inside face of the auxiliary fuse and block cover, to remove and fit the fuses and relays.
• To remove a fuse, use the tweezers provided to pull it out of the holder. Slide the fuse sideways from the tweezers. The wire within the fuse is clearly visible, and it will be broken if the fuse is blown (see illustration).
• Always renew a fuse with one of an identical rating. Never substitute a fuse of a higher rating, or make temporary repairs using wire or metal foil; more serious damage, or even fire, could result. The fuse rating is stamped on top of the fuse. Never renew a fuse more than once without tracing the source of the trouble.
• Spare fuses of various current ratings are provided in the cover of the auxiliary fuse box.  Note that if the vehicle is to be laid up for a long period, fuse 34 in the main fuse box should be removed, to prevent the ancillary electrical components from discharging the battery.
• Relays are electrically operated switches, which are used in certain circuits. The various relays can be removed from their respective locations by carefully pulling them from the sockets. Each relay in the fuse boxes has a plastic bar on its upper surface to enable the use of the tweezers. The locations and functions of the various relays are given in the Specifications.

The fuses can be checked visually to determine if they are blown.

• If a component controlled by a relay becomes inoperative and the relay is suspect, listen to the relay as the circuit is operated. If the relay is functioning, it should be possible to hear it click as it is energized. If the relay proves satisfactory, the fault lies with the components or wiring of the system. If the relay is not being energized, then either the relay is not receiving a switching voltage, or the relay itself is faulty. (Do not overlook the relay socket terminals when tracing faults.)  Testing is by the substitution of a known good unit, but be careful; while some relays are identical in appearance and in operation, others look similar, but perform different functions.
• The central timer module located on the bottom of the main fuse box incorporates its own self-diagnosis function. Note that diagnosis cannot take place if the heated rear window is defective.
• To activate the system, press the heated rear window button while the ignition is being switched on, then release the button. Operate the light switch, washer pump switch and all of the door switches one after the other, and check that the buzzer confirms that the input signals are correct. 
• Now move the wiper lever to the intermittent wipe position, and check the output signals by operating the same switches.
• Switching the ignition off and on again turns off the self-diagnosis function.

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HOW TO TROUBLESHOOT PRIMA PH-50D8 - PLASMA TV - HOW TO UPDATE SOFTWARE - DEBUGGING

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TROUBLE DIAGNOSIS [THE SCREEN IS NOT BRIGHT]

• Check to see if the power supply plug from the power filter board to the power supply board is well inserted into the socket. If not, plug it in.
• Check if the fuse on the power supply board is blown up. If yes, replace it for a good one. 
• Remove our main board and the video frequency processing board, ground the pin 4 POWER_ON/OFF of socket CN802 of the power supply board, and then push the slide switch SW2001 on the logic board to the internal modes (1, 3 up and 2, 4 down) from external modes (1, 2, 4 up and 3down).
• Switch the power on and see if the screen is lit. If the screen can give a normal and completely white field signal, then the problem lies in our main board or video frequency processing board, which will be dealt with separately.
• If the screen is not lit, then first replace the power supply board to see if the problem is solved.
• If the problem remains after the power supply board is replaced, then the problem lies in the screen. Replace the entire screen for treatment.

LINE OF SEVERAL UNLIT LINES

• Check if the socket between Y driving board and Y BUFFER is plugged well. If not, plug it well. If yes then replace Y BUFFER (upper, lower) in respect to the upper , lower part of the dark line on the screen.

The screen has one or several horizontal lines that are much brighter than the remaining horizontal lines at the edge: 

• Check if the socket between Y driving board and Y BUFFER is plugged well. If not, plug it well. If yes then replace Y BUFFER (upper, lower) in respect to the upper , lower part of the dark line on the screen.

One vertical unlit line or a vertical entirely unlit block.

• If it’s one vertical unlit line, then COF has problem. If it’s a vertical entirely unlit block, then first check if the connection socket between COF and logic BUFFER has problem. If not, check if the connection sockets between the logic BUFFER and the logic board is normal. If yes, replace the logic BUFFER. Finally, if the problem still remains when the replacement is over, then replace the logic board.

A mono color signal and one or several vertical bright lines of other colors:

• If it’s a vertical bright line of other colors, then the problem lies with COF or the screen.
• If it’s an entire vertical block of other colors, then first check to see if the connection socket between COF and logic BUFFER has problem. If no problem, check if the connection sockets between the logic BUFFER and the logic board is normal. If it’s normal, then replace the logic BUFFER. If the problem still remains after the replacement, then replace the logic board. Finally if the problem is still there, then the problem lies with COF.

The screen abnormal bright spots or blocks that are different from what’s described above:

• Check if the connection socket between COF and logic BUFFER board has been well plugged.
• Replace the logic BUFFER board. If it’s not solved then replace logic board. If the problem still remains, then it’s the problem with COF.

DEBUGGING

For Models PS-42D8 and PH-50D8, the debugging part lies only in the white balance adjustment. Nothing else should be adjusted and the maintenance software supplied for after-sale purpose has normally shielded the value of white balance i.e., no more adjustment is needed when upgrading the software. In case of special circumstances where the main board is replaced following method can be adopted:

• The white balance adjustment is made respectively in three ways - TV/AV, VGA,YpbPr. First adjust TV/AV, then VGA and YpbPr at the last
• Select corresponding channels respectively. After successively press the keys on the production plant’s remote control (the key at the right hand lower corner doesn’t show up), go on to press the left key, right key, confirmation key on the small keyboard one by one and then it’s possible to enter the menu set up in the plant.     
• Use the right key to select and calibrate the menu. The white balance adjustment and YpbPr white balance adjustment are for the purpose of white balance adjustment. For the white balance adjustment of TV/AV and VGA it’s OK just directly adjust the first item whereas for YpbPr adjust the second item.
• For the white balance adjustment of TV/AV and VGA: select the item of “white balance adjustment” from the menu. When it’s entered, keep RCUI immovable and adjust GCUT and BCUT so as to adjust the white balance of the dark area. For the adjustment of white balance of the bright area, keep RGR immovable and then adjust GGRV and BGRV. Repeat the above steps several times until the picture is normal in white balance.   For the white balance adjustment of YpbPr: select the item of “white balance adjustment” from the menu. When it’s entered, adjust RCUT, BCUT and it’s done.

SOFTWARE UPGRADING

• Select a connection wire of serial port, which is required to have a notch on its both ends, and also the pins 2 and 3 on the two ends are cross connected.
• Use the serial port connection wire to connect PC with PDP and set PDP to the off position.
• Open the folder of the upgrading software and double click the FlashUpgraderNT (on condition of window 2000/XP/NT)

• Based on the features of computer set up the serial port (COM Port) and select corresponding serial port (if it’s not possible to burnt-write other serial port can be used instead).
• Baud-select 115200 and then select Reset Target After Download. Hit flash press button and it’s ready to operate. For the setup of other items please refer to the figure above (already defaulted by the system so it’s normally unnecessary to alter).
• Switch on PDP and it begins to run the burnt-write program.
• Once it’s over with burnt-write, the cancel push button will become flash. Switch off the main power and then to switch on the TV set again.    

Note:   Do not switch the power or the set off in the course of burnt-writing. Otherwise it may result in the inability of the flash to burnt-write again.

HBUSTER HBTV-32L01HD - HBTV-42L01FD - MAIN POWER - 12V POWER & 1.3V POWER - SCHEMATIC DIAGRAM [Click on Schematics to Zoom]

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MAIN POWER REGULATOR [TYPE-1]

MAIN POWER REGULATOR [TYPE-2]

12V & 1.3V POWER 

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REMOVE THE BOTTOM & BACK COVER

MAIN BOARD REMOVAL

POWER SUPPLY REMOVAL

REMOVAL OF REMOTE CONTROL BOARD

REMOVE THE SIDE METAL SLICE - REMOVE THE BRACKET OF THE MAIN BOARD

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DISASSEMBLY PROCEDURE

MAIN BOARD BRACKET REMOVAL

POWER ASSEMBLY REMOVAL

SPEAKER REMOVAL

PANEL BRACKET REMOVAL

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TROUBLESHOOTING
The unit does not power ON.

• Check whether there is a fuse in the filter box of power line or whether the fuse has been blown
• If the unit can not be powered on yet, change the power line
• If the unit still can not be powered on, you should check whether the reset button is pushed down by the front panel
• If the unit can not be powered on yet after the above operation, you should change the main board part.

No Display

• Check whether the connection of video output is right.
• If there is no display yet, change the video output line.
• If there is no display yet, change the main board part.
• If there is no display after the above operation, you should change the video driver board part.

Unit Shut-down automatically.

• Check whether the power supply is accord with the specification.
• Check whether the fuse in the filter box of the power line has been blown.
• Check whether the ACC is connected to the high level (The ACC is connected to the battery generally.
• If the trouble is still not solved yet, check the connection between the front panel and the main board. If necessary, change the connector.
• If the unit shuts down automatically yet after the above operation, you should change the main board part.

No Audio Output

• Check whether the MUTE key is pressed.
• Check whether the Fast Forward key or the Fast backward key is pressed.
• Check whether now playing has audio.
• Change the audio output line.
• If there is no audio output yet, change the main board part.
• If the trouble is not solved yet after the above operation, change the loader part.

No AUX-IN function

• Check whether the AUX-IN input line is available.
• If the AUX-IN function is void yet, change the main board part. 

Fan do not work

• Check whether the power supply is turned on.
• Check whether the power socket of the fan is connected firmly.
• Change a good fan.
• If the fan cannot turn yet after the above operation, change the main board. 

Abnormal colour

• Check whether the video output of rear zone is normal.
• If the video output of rear zone is normal, that is to say the decode works normally, and you should check the connection between the main board and the TFT unit.
• If the video output of rear zone is abnormal, change the main board part.
• If the colour of TFT is abnormal yet after the above operation, change the video driver board part.

Only a White Screen

• Check the connection between the loader and the main board, the main board and the power supply board of TFT, the power supply board of TFT and the TFT.
• If the trouble is still not solved, change the power supply board of TFT.
• If the trouble is still not solved after the above operation, change the Display part.

No display.  Black Screen

• Check the connection between the loader and the main board, the main board and the power supply board of TFT, the power supply board of TFT and the TFT.
• Check whether the background lights are illumed. If not, change the CCFL board.
• If there is no display in the TFT, change the display part.
• If there is still no display in the TFT after the above operation, change the main board part.

Blue Screen

• Check whether the video output of rear zone is normal.
• Check whether the source can normally change. And have sound output.
• If yes,check the reverse detect line.
• If not, change the main board part.
• If not yet, change the video driver board part.

Mute Icon Display

• Check whether there is any audio output.
• If the audio output is normal, change the main board part. If the trouble is still not solved, change the display part.
• If the audio output is abnormal, change the main board part. If the trouble is still not solved, change the loader part.

Beeper function failure

• Check whether the beeper has turn off in the set-up option.
• Change the beeper.
• If the trouble is not solved yet, change the main board part. 

No Key Function

• Check whether the key in the front panel is available.
• Check the connection between the front panel and the main board. If necessary, change the FFC connector.
• If the key in the front panel is void, change the front panel part. 

No remote control function

• Check whether the key in the front panel is valid.
• If the key in the front panel is valid, that is to say the main board works normally. Check whether the battery of the remote controller is available or change another one good.
• If the key in the front panel is void, you should check the connection between the front panel and the main board. If necessary, change the FFC connector.
• If the trouble is still not solved yet, change the front panel.
• If the trouble is still not solved yet, change the main board part.

No Display in LCD

• Make sure the TFT unit is closed.
• If there is no display in the LCD also, you should change the LCD board. 

Abnormal display in LCD

• Check the connection between the main board and keypad.
• If the display of LCD is abnormal, you should change the LCD board.

No Volume Display in the TFT

• Check whether the volume knob is available.
• Check whether there is volume display in the TFT using the remoter controller to adjust the volume.
• If there is volume display in the TFT using the remoter controller to adjust the volume, that is to say the display part and the main board part work normally, you should change the front panel part.
• If there is no volume display in the TFT using the remoter controller to adjust the volume, change the main board part.
• If the trouble is still not solved yet, change the display part.

Playback picture is not good

• Check whether the disc is dirty, scratched or deformed.
• Check whether the lens of pick-up is dirty and clean it.
• If the picture of playback is not fluent yet, you should change the loader part.

Cannot insert disc

• Check whether there is another disc in the unit.
• Check the connection between the loader part and the main board part. If necessary, change the connector.
• If the trouble still exists, change the loader part.
• If the trouble is still not solved after the above operation, change the main board part.

Cannot Eject Disc

• Check the connection between the front panel and the main board.
• Check the connection between the main board and the loader.
• If the trouble is still not be solved, change the loader. 
• If the trouble is still not be solved after changing the loader, change the main board.

Disc Ejects Automatically

• Check the connection between the loader and the main board.
• If the trouble still exists, change the loader.
• If the trouble is not solved yet after changing the loader, you should change the main board.

TV function failure

• Check whether the connection is right.
• The TV/NAVI function is void yet, change the main board part.

Fails to Load

• Check whether the disc you want playback is accord with the specification
• Check the connection between the pick-up mechanism and the Servo & MPEG board. If necessary, change the loader part.