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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes are given with illustrations. You can get an idea about the fault to an extent.
Plasmas are like tube TV's(CRT). Once the plasma tube breaks, air gets in, plasma gas gets out. And that's it. They are an enclosed vacuum picture tube. I don't know why people buy plasma. The newer LED have a much better picture. Rich people who swear by plasma, are ridiculous in my opinion. Again, if plasma tube breaks, thats it. Any wrong jarring can break a plasma tube.
Mainly, this kind of fault is due to loose connection to its COF to display panel. The number of these COFs will be different according to screens size. These Chip On Film [COF] can be located in a row at the bottom of the screen, looking after the back cover removed. re-seat them, and check. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts. Screen-shots to defective plasmas are given. You can compare it to that of your TVs, and can make sure. Beware! All plasma TVs have dangerous potentials inside. Be sure to ware hand goloves to both hands during service work.
It denotes a panel fault. Anyway, contact any service technician to make it sure. If you wish to get some details, http://electronicshelponline.blogspot.com/ Pull up older posts. Scren-shots to defective plasma TV are given. Compare it to that of your TVs' and make sure about the fault. Good Luck.
The cost of getting this plasma fixed is not costwise compared to getting a new TV. I recommend NOT to get another plasma but get either an LCD or LED for the best quality compared with price. Plasma parts can be quite expensive especially for a 10 year old model or may not be available.