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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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 ?

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Have you got horizontal drive?
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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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My 15 year old Toshiba Televisiononly shows a narrow horizontal band in the middle of the screen. Sound OK.

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,'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.



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The faint white lines at the top of the screen is the warning that the pump-up capacitor in the vertical output circuit is going bad and the output itself is about to short out. When the TV stops working, the vertical output IC has finally shorted out. Replacing the vertical output IC, the pump-up capacitor and possibly a small value resistor next to the flyback (B+ for the v-out) should bring the set back to life.

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