No Picture on a Hitachi 42EDT41A

I recently fixed my Hitachi 42edt41a plasma tv. I had sound but no picture originally, but I replaced the y-sustain and the z-sustain boards and it works just fine now. Hopefully I can narrow it down to what components went bad, but my guess is the transformers or capacitors.

Then it is probably not cold solder joints. You wouldn't think that an lcd TV would need a high voltage transformer but it does. They are very small compared to CRT televisions but they power up the screen. Without it you have no backround light to veiw what is there. There are two neon lamps on either side of the screen but they rarley go bad. My guess is the transformer ot the power supply feeding it.