At noon, I received a 42-inch LED LCD TV from Konka. The fault phenomenon: it can be turned on, the backlight is bright, there is sound, and the screen is gray. Machine model: LED42R6610AU.
Disassemble and check the power board output 12V is normal, then go straight to the logic board, the measurement logic board power supply fuse has no voltage at both ends, after the shutdown, the point is shorted to ground.
Then remove the logic board separately, prepare to cook "burning chicken", connect 5V DC power supply, and soon a patch capacitor will appear in the original shape, "burning chicken" is finished, and the point is no longer short-circuited.
After the logic board is repaired, the connection is turned on and the fault remains. The retest logic board still has no power supply. It seems that there is still a problem with the motherboard. Since no drawings have been found, a wire has to be welded on the power supply end of the motherboard cable. The multimeter hits the buzzer file, a pen is connected to the wire, and the other pen is pulled on the motherboard for half a day. Finally, Find the power from an eight-foot patch ME9435A
It turned out to be a FET.
Look closely at the FET, which has burnt marks on it, but unfortunately there is no such component on hand. . I found a few old boards and I didn’t find them.
. Later, I found a P2003EVG on an old board, and the feet were the same. Just remove it and clean it. For the sake of safety, the logic board end cable will not be plugged in first, and the motherboard power supply terminal has 12V voltage. It seems that Successful replacement, plug in the logic board cable, boot KONKA screen appears, you're done
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