The Zsus and Ysus Board are common failures. It is a possibility that the Plasma Panel also is the problem. If you take the back off, (make sure unplug the set first), the board on your left is the Zsus and is marked accordingly. The Ysus is on the right of the Power supply. Look for fuses being open on the Zsus Board and Power Supply using a ohm meter. If they are, I would replace both Zsus and Ysus. They seen to fail together many times. If the fuses are good. I would suspect the Plasma Panel.
I hope this helps,
Skyassoc
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