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The plasma display screen is made of a matrix of elements
connected to cables along the side and top. On your unit, some of
these many, tiny connections are making contact intermittantly thus
losing the elements in that area. These contacts are held in
place with just pressure and if that is disturbed, you lose that line
of elements. Try squeezing the cabinet of the TV on the outside
at the top in the area of the loss and see if that makes a
difference. May have to go inside and see if the contact assembly
is disturbed or warped or something.
the problem was the y-sus board, i had a local tv repair shop diagnos that much for me. although, he couldn't fix it i did some research and found a company in california, itritek.com, who could. you send him the y-sus board and the two buffer boards and he not only repairs them but he upgrades them. apparently the y-sus board gets too much heat and eventually goes out, sometimes the buffer boards are affected too. itritek.com replaces the components on the y-sus board with better parts which are more heat resistent. i believe this will help you with your problem. let me know...good luck.