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JVC TV - horizonal lines at bottom of screen

Hey all... I've got an old (1996?) JVC AV-27BP6 27" television with a problem.

After it warms up for a minute or two, some horizontal black lines start to appear on the bottom of the screen. They flicker and scroll a bit, often reaching halfway up the screen and distorting the picture. There are anywhere from 5-25 lines, sort of a venetian blind effect. Hitting the side of the tv usually makes them go away for 5-10 minutes, but lo and behold they return!

I know that this is an oldish tv and is probably not worth doing any major repairs to, but I'm wondering if this is something that I could fix myself without being an expert (I do have some very rudimentary electronic repair skills). I'd like to avoid replacing the tv because besides those lines the picture is great, plus I'm on quite a tight budget these days and really only use it occasionally for movies. Because the hitting seems to work it makes me think there's a loose connection somewhere...

If anyone is familiar with this sort of problem and could point me in the right direction for a fix, I'd be *greatly* appreciative! Thanks...

-Rob

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rob77
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rob77
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It is best to indicate the manufacture name and model number.

In a general context, troubleshoot for thermo sensitive capacitors in the vertical deflection amplifier section. It is also possible because of the age of your set, there are a fair number of capacitors that are going high in ESR, and will eventually cause other types of failures.

Jerry Greenberg

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Jerry G.

Jerry put your glasses on..

Reply to
kip

I was told the problem is quite possibly a loose vertical ic connection, spoke with two people with similar models who fixed it by applying a little bit of solder.... since I have nothing to lose there, figured I'd give it a shot. But how to figure out which part that is once the tv's opened up? Are there any telltale signs I should look for?

kip Wrote:

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rob77
Reply to
rob77

rob77: This problem you are seeing is most likely NOT a "loose vertical ic connection" and is probably NOT going to be solved by "applying a little bit of solder" ..... More than likely, as others that have replied to your original post have indicated, the problem is caused by faulty and/or high ESR electrolytics in and around the vertical deflection circuitry. Not a difficult or expensive repair at a shop but not necessarily a do it yourself job for a rank novice..... particularly since televisions can pose a dangerous electrical shock hazard even when unplugged from the AC power. TAKE it to a shop for at the very least a repair cost estimate so you can make an intelligent repair decision with facts instead of Internet guesses.

-- Best Regards, Daniel Sofie Electronics Supply & Repair

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sofie

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