No display, sound and buttons work

I have a Sanyo fw50d36f, it got hit by a power surge over a year ago, I've purchased replacement parts for the power board, main input board, and the display board, I've got the sound and the buttons working so I can change the source and hear it when it goes to different sources but no video. I can see that the brightness changes as I change sources but nothing is displayed. Any ideas?

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