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SMPS POWER SUPPLY SCHEMATIC - IC SG3844 - TDA 8170ST – MJF18204 - Used with Edison Continental TV
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LG 42PT250B - 42PT250B-SA - PLASMA TV - TROUBLESHOOTING TABLE
Check system, after power Off/On one time.
- Power-Up Boot Fail Trouble Shooting
- No OSD Trouble Shooting
- Digital TV Video Trouble Shooting
- Analog TV Video Trouble Shooting
- Component Video Trouble Shooting
- RGB Video Trouble Shooting
- AV Video Trouble Shooting
- HDMI Video Trouble Shooting
- All Source Audio Trouble Shooting
- Digital TV Audio Trouble Shooting
- Analog TV Audio Trouble Shooting
- Component / RGB / AV Audio Trouble Shooting
- USB Trouble Shooting.
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MODULE CONTROL TROUBLESHOOT
USB power could be disabled by inrushing current. In this case, remove the device and try to reboot the TV AC power off/on.
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HOW TO ADJUST POWER PCB ASS'Y VOLTAGES - LG 42PT250B - PASMA TV
Vs adjustment.
- Connect + terminal of D.M.M. to Vs pin of P811, connect -terminal to GND pin of P811
- After turning VR901, voltage of D.M.M adjustment as same as Vs voltage which on label of panel left/top (deviation; ±0.5V)
Va adjustment
- After receiving 100% Full White Pattern, HEAT RUN.
- Connect + terminal of D.M.M. to Va pin of P811, connect -terminal to GND pin of P811.
- After turning VR502,voltage of D.M.M adjustment as same as Va voltage which on label of panel left/top (deviation; ±0.5V)
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HOW TO DOWNLOAD EDID AND DDC - LG 42PT250B - PLASMA TV
It is established in VESA, for communication between PC and Monitor without order from user for building user condition. It helps to make easily use realize “Plug and Play” function.
For EDID data write, use DDC2B protocolAUTO DOWNLOAD
After enter Service Mode by pushing “ADJ” key,
- Enter EDID D/L mode.
- Enter “START” by pushing “OK” key.
It only needs to PCM EDID D/L for North America Product. (PU11A)
EDID data (Model name = LG TV) HDMI -1 EDID table (2D HD) - South Central America (PT250B/E, PT260E)
HDMI-2 EDID table (2D HD) - South Central America (PT250B/E, PT260E)
MANUAL DOWNLOAD
Using instruments
- Jig. (PC Serial to D-Sub connection) for PC, DDC adjustment.
- S/W for DDC recording (EDID data write and read)
- D-sub jack
- Additional HDMI cable connection Jig.
- Set instruments and Jig. then turn on PC and Jig.
- Operate DDC write S/W (EDID write & read)
- It will operate in the DOS mode.
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HOW TO EJECT DISC MANUALLY - JVC LT-32D200-AK - LT-32DV20-AK - HOW TO IDENTIFY THE TRANS INVERTER
- Remove the Rear Cabinet.
- Rotate the gear in the direction of the arrow as shown below.
DVD MECHANISM - TOP VIEW
TRANS INVERTER IDENTIFICATION
- When you replace one of the below Trans Inverters on INVERTER PWB, replace with the one that has same parts number.
- For the part FU-LTZ3PZDAR007, in addition to the lot number, the letter “DARFON 7609A” is printed on the bottom of the part.
- For the part FU-LTZ3PZ0XB009, in addition to the lot number, the letter ”3PZ0XB009 JS HVT-153” is printed on the bottom of the part.
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HOW TO ENTER SERVICE MODE - LT-32D200/AK - LT-32DV20/AK - HOW TO INITIALIZE
Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to perform these adjustments only after all repairs and replacements have been completed. Also, do not attempt these adjustments unless the proper equipment is available.
HOW TO MAKE THE SERVICE REMOTE CONTROL UNIT:
Cut "A" portion of the attached remote control unit as shown.
SERVICE MODE SET-UP
- Use the service remote control unit.
- Turn the power on.
- Press the service button on the service remote control unit. The following screen appears.
PURITY CHECK
This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.- Enter the Service mode.
- Each time pressing [7] button on the service remote control unit, the display changes as follows.
When entering this mode, the default setting is White mode.
INITIALIZATION
The purpose of initialization is to place the set in a new out of box condition. The customer will be prompted to select a language and program channels after the set has been initialized. To put the program back at the factory-default, initialize the LCD TV/DVD using the following procedure.DVD SECTION
- Turn the power on.
- To enter the service mode, press the service button on the service remote control unit.
- To cancel the service mode, press [POWER] button on the service remote control unit.
- To put the LCD TV/DVD into the DVD mode, press [CH RETURN] on the remote control unit.
- To put the LCD TV/DVD into the Flash clear mode, press [INPUT SELECT] buttons on the remote control unit in that order within five seconds. The following screen appears.
To exit this mode, press [CHANNEL UP/DOWN] button to go to TV mode, or press [POWER] button to turn the power off.
LCD TV SECTION
- Turn the power on.
- To enter the service mode, press the service button on the service remote control unit.
- To cancel the service mode, press [POWER] button on the service remote control unit.
- Press [INFO] button on the service remote control unit to initialize the LCD television.
- "INITIALIZED" will appear in the upper right of the screen. "INITIALIZED" color will change to green from red when initializing is complete.
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JVC LT-32D200/AK - LT-32DV20/AK - LCD TELEVISION BUILT-IN DVD PLAYER - MAIN POWER [SMPS] - BACK-LIGHT INVERTER - SCHEMATIC [Circuit Diagram] - 2SK3563 – LTV817MCF
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BACK-LIGHT INVERTER SCHEMATIC
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JVC LT-37A80SU - LT-37A80ZU - LT-37DA8BJ - LT-37DA8SU - LT-37DA8ZU -POWER SUPPLY [SMPS] - SCHEMATIC [Circuit Diagram]
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JVC AV-17V214 - TV - POWER SUPPLY [SMPS] - SCHEMATIC [Circuit Diagram] - STR W6754-F5
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JVC AV-27D502 /AR - AV-27D502 - SMPS - Schematic Diagram [Circuit Diagram] - STR G6624/F8
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JVC AV32H20EUS - AV28H20EUS - AV28H20EUB - SMPS SCHEMATIC [Power Supply Regulator Circuit diagram] - STR F6667B/F7
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STR-F6667B
STR G6624
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SAMSUNG HL T5076 - PTV - MAIN POWER [SMPS] - SCHEMATIC [Circuit Diagram]
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HOW TO TROUBLESHOOT - SAMSUNG HL T5076 - SCREEN ERRORS - SERVICE MODE - Internal Noise
SCREEN ERRORS
- 40 Vertical lines 16 pixels wide: DDP3021 or BGA, DMD panel interference.
- Replace the DMD board or DMD Panel.
Horizontal Bar or No Raster: Error in DAD2000 or DMD Panel or other DMD board problem. Replace the DMD board or DMD Panel.
Dotted Vertical Bar: Error in Rambus Dram(IC 403) or the soldering. Replace the DMD board.
Beehive mosaic patterns all over the screen: Error in the TMDS Receiver (IC100) or the soldering. The H sync signals are not transferred to DDP3021. Check the Digital Board and DVI cable If there was no problem, Replace the DMD board.
VIDEO CIRCUIT ERROR CHECKING
Basics:
- The DDP3021 on the DMD board has a feature to display internal test patterns.
- SDP62, which is an end port in the digital board, has a feature to display internal test patterns.
- The rear board is the first output and the main board is the second one, followed by DMD, which is the final one.
- Access Service Mode. (In Standby mode, press "Mute", "1", "8", "2" and "Power" to turn the screen on and enter service mode)
- Check if there is an error in the DMD board DDP3021 →TEST PATTERN →Press the right arrow key: Options of FULL WHITE, BLACK, RED, GREEN and BLUE PATTERN are displayed on the screen. If "Pattern" does not appear, this is a DMD board error.
- Check if there is an error in the main board before the DMD. When the DMD board has been determined to be error free based on the test patterns: FACTORY MODE àSDP62 àTEST PATTERN normal display: no error in the main board. If "Pattern" does not appear, you have to check a rear board first, and check a DMD Board second, next check a main Board.
- Check for a power signal from the SMPS to the main boards.
NOISE
A foreign substance on the fan or driving device may cause internal noise. For a DLP TV, the lamp fan, DMD board fan and color wheel are vulnerable to noise. Sometimes the connector wire around the lamp or DMD fan makes contact with the fan, while the color wheel is protected inside the module and cannot make contact with any nearby wires. However the color wheel sensor or the drive motor may cause noise by making contact with the color wheel. As the color wheel uses an air bearing system, it has a very slight possibility of creating internal noise.When irregular noise occurs for no particular reason, check the inside of the TV for any foreign substances. The DLP projection TV may cause noise as the physical screen is empty inside, causing a resonance to a particular frequency. Thus a low vibration is not a malfunction.
Any 'creaking' noise is mostly from the structure of the device itself. A short, harsh noise may occur from a distortion or malformation due to thermal expansion between the metal joints, screws and loaded parts, respectively. Any intermittent 'creaking' noise can be removed by loosening the screws.
- A black screen with the lamp on: Replace the DMD board.
- Line Pattern: Regular line patterns occur vertically or horizontally: Replace the DMD board.
- Voice Distortion: Replace the main or rear board.
- Outside Light: This is not a product malfunction, but a possible installation or human error. This occurs when the projected light from the surrounding illumination reflects onto the screen. This disappears as the TV starts operating and the TV lamp gets brighter. However, you can avoid outside light by changing the position of the TV or the installation angle. Decreasing the illumination or changing the indoor lighting may work.
- Screen Flip-over: Enter Factory mode in DDP3021 and perform H-Flip (flip horizontally) and V-Flip (flip vertically). The screen will flip over horizontally or vertically.
Blinking Temp & Timer LED CLICK ON THE PICTURE TO ZOOM
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SAMSUNG DLP PROJECTION TV - LED BLINKING CODES - PROTECT STATUS - Malfunction Flochart
It takes about 30 seconds for the TV to warm up, so normal brightness may not appear immediately.
The TV has a fan to keep the inside lamp from overheating. You'll occasionally hear it working.
PROTECT STATUS
Attempting to turn the LED on fails repeatedly
If turning the lamp on fails, the set automatically tries turning the LED on 3 times. If all attempts fail, all LED's on the front panel will blink. Check the LED,LED Driver and Sub power check the LED,LED Driver and Sub SMPS and replace them if necessary.
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SAMSUNG TXM2756 - CT29F6 - CT26F6 - TXM2556 POWER SUPPLY [SMPS] - Horizontal & Vertical scan Output - Video Output - SCHEMATIC [Circuit Diagram]
CT29F6SWX/XAO - CT26F6SWX/XAO - CT29F6SWX/XAP - CT26F6SWX/XAP]
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CRT BASE CARD SCHEMATIC
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RPTV - SAMSUNG - PCL545 - PCL6215 - HCL552WX - HCL652WX - POWER - SOUND - VIDEO OUTPUT - SCHEMATIC [Circuit Diagram]
Applicable to: PCL545RX/XAA - PCL5415RX/XAA - PCL5415R3C/XAA - PCL6215R3C/XAA - HCL552WX/XAA HCL5515WX/XAA - HCL652WX/XAA - HCL6515WX/XAA
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R/G/B OUTPUT
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SAMSUNG - PCL545 - PCL6215 - HCL552WX - HCL652WX [RPTV] - Convergence Adjustment Procedure
- A sensor is attached on the center of each side of the Convergence Mode pattern. The sensors are required for normal Perfect Focus function.
- Use a screen jig to do the convergence adjustments correctly (Especially, perform correct convergence adjustments on the center of each side where a sensor is located.)
- Do the convergence adjustments correctly. Otherwise, any Perfect Focus error can happen.
- Warm up the TV for least 30 minutes.
- Input an NTSC Signal.(Use an antenna or AV source.)
- Enter the Convergence Mode by pressing the remote control keys in the following sequence: MENUà1 à8à3
- If OSD displayed as shown in figure below, press the key to exit. Then, redo step 3 to enter the Convergence Mode. After entering the Convergence Mode, Stand by for about five seconds before doing the adjustments.
To adjust Green, first press the [+100] and the [Pre-Ch] keys and then press the [8] key.
The TV/Video, key moves the cursor horizontally or vertically.
When the TV/Video, key is pressed once again, the cursor moves horizontally.
The 'Mute' key moves the cursor right, and the [P-Mode] key moves the cursor right.
New adjustment.
Use the joystick on the remote control (type TM63) to move the cursor. Move the joystick left/right/up/down to move the cursor left/right/up/down.
Use the (4) key for overall balance.
After line shift is cancelled by pressing the (4) key, use the channel and volume keys [up/dn] to make big adjustments.
After the Green convergence adjustments are completed, press the [Add/Erase] key to save the data.
Superimpose the Red and Green colors by pressing the [+100] and the [7] keys.
To adjust Red, re-do the above steps.
To superimpose the Blue and Green colors press [1] the (+100) key for R-Mute, [2] the (Pre-Ch) key to cancel the B-Mute, and [3] the (9) key for B-Select.
To adjust Blue, re-do these steps 5to8
If any color is not properly adjusted when displaying the Red, Blue and Green colors, readjust the color.
After color adjustments are completed, press the [Add/Erase] key to save the data. The cursor moves to center, and then automatically moves up and to the left above five seconds later.
After the adjustment is completely saved, press the Perfect Focus key to perform auto-convergence (Factory Mode). Auto convergence is performed in the following sequence:
G > R > B
UP > LEFT > DOWN > RIGHT.
When auto convergence is complete, the data is automatically saved and the convergence pattern reverts.
After Factory Auto Convergence is complete, make sure that the cursor flickers for about 1 second on the center, and then saved.
Check the presence of error through the flicker of the cursor.
When any error happens, be sure to re-do Factory Auto Convergence.
When convergence adjustment is normally done, or the convergence center is misaligned with the sensing point, any adjustment error happens. Therefore, be sure to use the screen jig to correctly adjust during troubleshooting.
After the convergence adjustments are completed, press [S-mode] key to Exit.
DTV convergence must be done same as the above normal mode convergence adjustment.
After DTV convergence adjustments are completed, do the following items for normal operation of perfect focus.
Select DTV mode.
Enter the Factory mode to change OFS 0 > 1
Move the mode geometrically in Vertical Size increased.
Adjust VSO/VAO/VLO to change the value of Vertical size/Vertical Shift offset. (Vertical size: 2.5 ~2:2.5~2/ Horizontal size: 5.5)
Re-change the OFS after all adjustments are complete. [OFS > 0]
Exit the Factory Mode. (OSD: "Factory Mode")
If nothing is abnormal, then Exit from the Convergence Adjustment Mode.
Re-do perfect focus in User Mode.
If no error happens, complete the perfect focus.
When convergence adjustments are not normally done or the convergence center is misaligned with the sensing point, any adjustment error happens. Therefore, be sure to use a screen jig to correctly adjusting during troubleshooting.
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PROJECTION TV - SAMSUNG PT-5492S - CONVERGENCE BOARD - SCHEMATIC DIAGRAM
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Convergence MDL
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HOW TO DISASSEMBLE WelchAllyn VIDEO COLPOSCOPE - Medical Equipment
- Slide access door away from housing assembly.
- Remove connector from lamp. Note: Connector has 2 different size holes.
- Slide lamp away from lamp housing assembly.
- Observe the correct path for lamp wires.
- Remove the 4-torx screws from left outer housing with a T-15 screwdriver.
- Reach under label and peel away from housing.
- Open outer housing this way to avoid stress on ribbon cable.
- Disconnect locking connector.
- Observe the correct positioning of ribbon cable in left outer housing.
- Remove the 6 Phillips head screws that hold the switch PCB to the left outer housing.
- The switch pad is attached to the left and right switch PCB by rubber tabs. Gently pull tabs away from switch PCB.
- Logic PCB is removed by removing connectors and 4 Phillips head screws. Note connector orientation and wire harness path on Logic PCB. Fan wire exits on left side.
- Gently pull the light director from focusing sleeve.
- Observe the positioning of plastic tie wrap. This tie wrap serves as a polarizing filter brake.
- Unscrew focusing sleeve from lamp housing. Note orientation of light director, filter and focusing sleeve.
- The glass rod/ferrule assembly may come out with the focusing sleeve. Do not lose the UV filter in the end of the brass ferrule.
- Camera chassis removal, from the right housing is accomplished by removing the 3 torx T-15 screws from right outer housing.
- Remove camera from right housing.
- Unscrew outer lens.
- Remove lens gasket and lens filter. Note lens filter tab orientation.
- Removal of ballast PCB is accomplished by removing connector and 4 screws.
- Unscrew three Phillips head screws for Sony camera removal.
- Gently pull camera from chassis.
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TROUBLESHOOTING - WelchAllyn - Video Colposcope [Medical Equipment]
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