This sounds like your Z sustain board has gone bad. I just repaired an HP plasma today with the same complaint. All the modules inside were LG. The Z board is the one on the Right side of the set with the cover off or facing the back. You might have 1 or 2 ceramic fuses on it, check them, if one is bad Replace the board.
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hello robert,
did you ever get that tv sorted out? Looks like i'm having the same problem: bad picture with pixels jumping in and out all over the screen
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