@kevinjacques just a preliminary quick look and it appears that there is some residue (Blue arrows) of something on your board. Could be a leaking capacitor. Teh capacitor itself (red Arrow) looks like it has a domed top. That would mean it is/has failing/failed. It could just be the angle of the image but have a closer look at that. Please remember that you are dealing with a rear projection TV that is essentially a CRT. those pack some high voltages and you always want to make sure that you discharge the capacitors before you touch the contacts etc.
I also noticed a degrading of the rubber boot on what appears to be the flyback transformer (Yellow arrow). Could just be aging of the rubber but could also be something more sinister. That should not be a cause for your TV not to show any sign of life. Just something to think of later. For now focus on the power board. That is the board where the power cord connects too. We may need some more images of that once you check the things I've pointed out.
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