This seems like an old topic, but I will reply to it anyway

I have the same mainboard in the same TV model. I have noticed that the elecrolytic capacitor which is next PSU input connector is shorted. After following the connections I have found that D1101 diode on the back side of the board is faulty and also MP1583 on the front side of the board was faulty. Please check if all the voltages are OK before dumping the main board.
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