Sounds like panel fault. Check this site. There is screen shots to many faults that occurs to Plasma displays. Compare them to that of yours, and get confirmed. Pull up older posts there. Check the site with patience. More than 2000 post are there, and all are related to repair help to electronic entertainment and domestic equipment.
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Hello,solution has been found,the problem was a blue ray machine on top of media box causing this problem,so advise anyone not to place any machines(dvd recorder etc)on top of box.
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