I have this same set and a similar problem. I have 2 very thin white bars, each about about and inch or two wide in the upper left corner of the screen when watching cable or a dvd. I thought it might be interference from my center speaker, but if that were the case then there should be these bars when on a blue screen for a video input. I also tried unplugging the coax cable because I thought it may have been a bad line, but with no cable coming in there are still the bars when watching a dvd. Anybody know how to get into the service menu to maybe shift the image slightly up to eliminate the problem?

Man thanks for the great thread - I had the white lines with reflections in the upper part of my screen as well and I changed out the capacitor mentioned. It worked like a charm and the part cost $1.30 from Radio Shack. BTW, I don't know anything about electronics and just decided I had nothing to lose by giving it a try. Thanks

will this fix my white line when replacing the C424 cap?

Add me to the JVC white lines across the top of the screen gang. A smart fellow who used to repair TV's guessed that the problem might be The filter capacitor on the 25-28 VDC supply to the vertical IC is failing. As it gets warmer, its value increases, resulting in the improvement you describe. Eventually the vertical deflection IC will fail in this situation, resulting in a single white line across the middle of the screen. He didn't think it would be too expensive to repair, but didn't guess at a dollar amount. Mike

I started having this problem a few months ago and it's slowly gotten worse, now it's to the point where I have 4 lines covering about 1/5th of the screen. I called JVC and they basically told me they didn't care about it and that this was the first time they had heard anything about it. Which is about par for the course with pretty much any manufacturer these days, so I wasn't suprised. Guess It's time to find a new TV.

Did you guys ever figure out what was causing the lines? I have the same problem.

Hey - room in the club for one more 27" JVC owner with horizontal white lines across the top of the screen. Problem started with just a couple now up to about four inches of the screen. Doesn't sound promising.

I called JVC yet again and they still deny the problem is their fault because they haven't heard any complaints about it. We have about 8 people here who are experiencing this problem - if we each were to call JVC and complain about it, PERHAPS they might be willing to fix it for free. JVC Customer Support 1-800-252-5722

Ok, the situation has now deteriorated to exactly what Richard describes. When I turn the tv on, the top quarter of my screen has thin white lines that go all the way across. After the tv is left on for a while, it slowly diminishes so that only the top 5th or 6th of the screen has these thin white lines. This problem is apparent on every video setting (video 1, video 2, video 3, and tv). Once again, the model is JVC AV-27230. I would REALLY appreciate some help.