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I would wager it has something to do with the power circuit for the screen. On an LCD CCFL back-lit TV it was a simple circuit to power up the CCFL bulb, so it was either the high voltage power circuit or the bulb, little to troubleshoot really. Plasma IS the lighting, so each pixel has power, in theory.
I think you would have to take it somewhere to have it looked at, or do a lot of interweb searching.
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