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this can happen from loose HD cables and faulty hdmi cable. Confirm when its doing it, like watching cale or just when you watch dvd'd. But if its not all the time, then the plasma cells are still good.
The TV is design for 16:9 format. The bars appear when the TV off showing that the TV has been watching under channels which is have 4:3 format for long time. The screen was burn out because no sweepping to those area. This is not critical problem but you can do nothing to fix it. To eliminate it a bit you shoud read the manual, I believe it has mentioned how to roll or sweep the screen. For plasma TV, if you keep watching 4:3 channels fomat, you shoud do it one a month within 30'. Good luck
I believe that this could be a type of "burn in". If you watch anything with a black stripe on the sides or bottom of the screen often, then this could be the problem. My suggestion is to watch things that have no black side bars for a while (>week) and see if this eliminates the problem.
Help! My Plasma by Magnavox is putting black verticle lines on the right side of the screen - comes and goes - and I replaced the entire Direct TV-HD unit - wires, everything - and had TV company repair - and it still came back. The TV repair refuses to take TV back because it does not show up when they come. Although I videotaped it and showed them which has the date and time - they still refused to take it - and tried to get me to sign a paper saying it was working while they were there - which of course I refused to sign - so they left and nastily said they will not be back-find someone else. I still have the lines - and do not know what to do! Can anyone help?