I'd get repair estimates next. Or replace boards until you find it.
We had a lightning storm and it knocked out the TV and two other devices that were attached to my Monster power supply. I might have been able to do something with monster but I lost the receipt and haven't heard back from them.
So, the light was blinking red and the TV wouldn't come on. I've read that the issue was the power supply / board or some capacitors. I don't have the skill to replace these individually so I purchased a replacement on ebay. After installing the new board (3 wires, 2 small up top and one cable that ran to the input board), it's not even showing the red light anymore. I switched the board back to the original and it's doing the same thing. Is there something I'm missing to reset the board after installing the new one?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic