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LG 47lb5800 Blue screen, no video or sound, but stays on.

LG 47lb5800 Blue screen, no video or sound, but stays on.

As the title states. I have tried resetting the tv by holding down the power button, I have replaced the main board and still the same problem. I can see the led strips do works through the small holes on the back of the tv. There are no domed capacitors on the power supply board, i dont think the tv would stay on if it was the power supply board. Please help.

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