I have a 27" JVC AV-27BP3 CRT TV
and occasionally the picture becomes a single horizontal line at the center of the screen. If I bang the set, or cycle the power it off/on (after 30sec-1min), the full screen sometimes will show again. After fully cooling, it seems to show a full screen most of the time. Sound and other functions all work fine.
The TV is 13-14 years old. Thanks for any suggestions.
I have a similar problem on my CRT computer monitor (AcerView 76c). It is an old screen and I think it is just at the end of its life, much like your TV. Having some background in physics, I would be pretty sure that the problem is with the cathode ray tube's vertical deflection system. The horizontal deflection electrodes are working while the vertical one is not. This results in a display of a single horizontal line (or in my case, a few superimposed) in the centre of the screen. Where both X and Y (horizontal and vertical) deflectors fail then the electron gun firing would result in a single bright spot in the dead-centre of the screen.
So really, we have no choice but to move on and buy a new set as repair is probably just as, if not more, expensive than replacement with a new device. Seeing as your post was in 2007, I hope you managed to solve the problem.
Best wishes,
SZ (Sydney, AUS)
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