Question about JVC AV-27720 27" TV

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JVC AV-27720 TV Problem: Picture goes to horizonal white line in center.

First, a little background. This TV worked fine until cats used the TV top case as a launching point. The screen would compress, then it finally went to just a horizontal white line in the center. Note that before it went completely bad, I could press on the top case and cause the picture to go back to full size.

Upon disassembly, I noticed that the only thing the top case was pressing on was a grey cable that is routed around the picture tube and is terminated into a 2 pin connector on the main PCB. The cable does have creases where the case was pressing. If I disconnect the cable, nothing changes.

I'm an old electronics tech (i.e. rusty), and I don't have schematics. I can perform basic AC/DC voltage tests, but don't have a signal tester/Oscope.

I'd hate to throw this TV out! Can you provide any insights or instructions on how to troubleshoot?

Thanks,

Joe (joejjt)

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In most cases the following parts need to be replaced I think the part location numbers are accurate
IC421 LA7832 ( vertical output IC )
Capacitor C424 100UF @35v
Zener Diode D422 MTZJ75-T2
Resistor R541 1.8ohm 2watts

Posted on Mar 12, 2009

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White lines at top of av27230


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Your posted description is a known (common) problem for the JAV-27230 and should be easily repaired. The vertical capacitor (C424 - 100uf/35V) needs to be replaced. It is relatively cheap and can be bought from any electronics parts store.

in some instances, it could be the vertical IC starting to fail or even a simple case of cold solder.

As always, extreme care when repairing the insides of a TV unit since HV can still be present even when off and unplug. A little knowledge of electronic components and use of a soldering iron should do just fine. Should you not be comfortable doing a DIY, then perhaps you can ask the assistance of a buddy who has some soldering experience.

Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.

good luck and kind regards.

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