Question about JVC AV-21meu 21" TV

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How can i solve or troubleshoot my jvc 21 inch tv?only a line horizontal is present..i suspected it the problem is in the vecrtical ic but how can i assure that and what are the symptoms of a cracked ic?in vertical ic it is craked .

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If thhe ic has a crak that you can see then it is no good replace the ic If looks good then look real close where it is soluder ontothe board for little crakes in the soluder where the pins are. I would resolder the ic anyway becouse some thime you cannot see the crakes but the pins are loose. Now there is some capasistors in that cerit also that go bad.You would ned a capasistor checking machine to check these out of cerit.These capasistors that im talking about are usley black with writeing on the side like 10u 25 v this is not for the ones you have in your set just trying to let you know what im talking about. There is a pos and neg side to this kind of cap and they have to be put in just the way they are took out. Try resoludering the ic first then see what happens if it looks ok, if that does not fix it replace the ic and caps. This ic will be mounted to a heatsink by the way.

Posted on Mar 09, 2009

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1 Answer

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First, You should to replace by original part, then you should check the voltages on power supply, and check the voltage for vertical IC based on datasheet, also check the voltages on vertical section including yoke and last you should check the ESR capacitors on vertical section.

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Check the deflection yoke connection cable for any loose contact at its connection socket at main board side. Unplug the connector out from the socket, and re-plug it back for at least tow times. Check the solder terminals of all connections to horizontal output. It will be best to re-solder all suspected solder terminals there. [horizontal sweep signals to the deflection yoke is absent now. Only vertical sweep is present now]

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My television, a jvc 21 inch shows only half-screen or at times just a bright line in the middle, what could be the problem and can it be fixed ?


Yes.This tv problems it is pretty easily repair,tv have a cold soldering in a vertical IC or around that area.But must have a soldering iron and a roll of solders and know and have some basic soldering skills.Take the tv aparts and turn it on take the plastic end of a screw driver tapping arond a vertical IC or around that area.Find out the vertical IC or around that area.Turn the tv off and resolders that vertical IC or that area,will solved this problems.Or take it to the tvs shops tell them the problems.If they're give u fairly priced for a job.Like about $25-$35 maxs.

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1 Answer

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normally this is a problem with the vertical ic, take a close look at the soldering if your lucky you find hair cracks and re soldering will solve the problem.if that does not help , check the connections of the deflection unit or the condensers around the vertical ic.take care chassis is still dangerous if unplugged.
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Hiii fairley,

You aren't specsificly dercribe yor tv set.
For common TV horizontal problem ;i.e : White line accross the horizontal screen, horizontal band,etc..it's can solved by replacing the IC Vertical/Transistor, and olso to replace the cap nearest the IC.

For common TV Vertical Problem :i.e : White line at the center of the screen (top to bottom),Vertical band,etc...It's can cure by Replacing the Horizontal IC/Transistor,and offcurse the cap's.

Tha's what all I know....

Hope can help you to solved the problem.

Thank's

h3liax

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1 Answer

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