I just did the fix described by others and it was fast and easy - thanks so much! Mine had two small black knobs on the right center rear (behind the cover), one labeled "picture". I only needed to turn it clockwise a tiny bit to stop the flashing picture - any farther and I got green lines on the picture. There are screws around the perimeter of the back and also three on the jack panel. Keep track of which goes where, some are different sizes/lengths.

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