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Plasma shows rings of contrast around highlights & shows echos of what has been on the screen which last several seconds before fading away

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This is common with plasmas actually. So long as the image fades and isn't a constant residual affect I wouldn't worry about it, but if it is constant and doesn't fade, its a sign of plasma burn out. The plasma in the tv has been active too long with one specific image or series of images. 

Plasma televisions have been complained about because of this. 

Posted on Sep 01, 2008

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If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

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finally a consumer that gives us plenty of info :)
sounds like an overdriven green tube, the only thing you can try is to find the G2/Focus block assembly, either behind front speaker grill or remove back of set and look for a black box approximately 5"X5" , this box will have 6 philips type adjustment screws(plastic) 3 are for focus, do NOT adjust these,
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