Old trick.....put a dvd in with a blank white screen(screen shot and burn to disc) and leave it on for a few hours, should take the burned in images of the screen. Plasma is the worst for gaming though.
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If you look on the settings, most plasmas have this option built in. Mine is old and cheap, and it will go full white, inverse like a negative image, or has a white cube you can set to bounce around the screen while you sleep.