I am a Changhong 42-inch plasma TV 3D42738IV suddenly in the process of using the automatic black screen power off. Once again, the power indicator light can be on, but when the standby button is activated, the TV is gone, enter the protection state.
After disassembling, it was found that the three IGBT tubes of VSUSH and VSUSL were short-circuited. After replacement, the tube was burned again. It seems that there are other faults on the board that cause the tube to burn.
In the power-off state, use a multimeter to measure whether the surrounding components of all power tubes are open-circuited, and the luck is good. It is found that the gate current limiting resistor RC345 of the IGBT tube of the VSUSL part is open. There is also the gate current limiting resistor of the IGBT tube of the RMAP_DN part. RC374 short circuit. After all other resistances are checked, after the two places are replaced, the fault is recovered.
I have spent a long time in the repair process to find the drawings of the machine Y board on the Internet, but none of them. Finally, I took a part of the picture, because of the time relationship, not all the painting. Only the Y drive circuit part was drawn. Source file It is drawn with AD10 software, and the source file is provided. I hope that the enthusiastic heroes can improve this picture on this basis. If there are any errors in the picture, please indicate the correction. I hope that we can share the perfect one. Changhong 3D42738IV Y board drive part schematic.pdf
Changhong 3D42738iV Y board schematic (AD10 file).rar
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