FACTORY MODE [SERVICE MODE]
- Push MUTE-MENU-OK-SLEEP key in turn at the interval of 1 second.
IF adjustment
- Input DV 5V into TP2, input 12V to TP6, Input 5V to TP4 and input 0V to TP5, monitor voltage of TP3, input 38.9 MHz signal to TP1, and use a non-inductance screw driver to adjust IFT L207 so that TP3 voltage is 1.65V
- Input DC 5V into TP2, input 12V to TP6, Input 0V to TP4 and input 5V to TP5, monitor voltage of TP3, input 33.9 MHz signal to TP1, adjust potential meter RP202 to set TP3 voltage to 1.65V.
- Connect IF line of tuner, control line L and L’: three disconnected points in total.
AGC Adjustment
- Receive D-8 signal of 60 db, measure the voltage of positive pole of D201 with DC potential meter.
- Adjust potential meter RP201 to make reading of potential meter just decrease below 4.0V.Input 100db from antenna, the picture should not appear non-synchronized and distorted, input weak signal of 35 dB--40 dB, color should not disappear, picture synchronizes, normal sound.
- Select a serial connection wire and a VGA connection wire and then connect them by means of a patch panel
- Use a serial wire to connect the PC to the patch panel and set TV set to off state
- Open the software upgrade file holder and double click FlashUpgraderNT(use under window 2000/XP/NT)
Based on the computer features, set up the serial port(COM Port). Select corresponding serial port (if it’s unable to FLASH WRITE, change to another port). Baud is selected to be 115200. Then select Reset Target After Download. Click FLASH push button, it’s ready to run.
Switch on TV set the FLASH write program begins to run;
After FLASH write is over, push button “cancel” will become flash. Then shut the main power supply and its OK just switch it on again. Do not shut the power off or turn the TV set on during the FLASH write. Otherwise it may lead to no way for flash to rewrite.
TROUBLESHOOTING [NO PICTURE]
Click on tables to Magnify
NO SOUND
NO PICTURE; HAVE RASTER [SCREEN]
