I have a jvc tv # AV-270-20 serial # 17414089 I purchased it in Toronto in 2000 Daytime viewing is out of the question. The picture quality is very poor-at the moment I have a scrolling line I can't to stop. Video viewing is not bad but tv is worse. I have tried everything in the manual-it has gotten progressivly worse. Do tvs picture tubes ever need replacing? Hope you can help- Peggy

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