Question about Apex Digital PF2720 27" TV

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Picture scrolls on all inputs except Componenet

My TV was in storage for about three months. When I put it in my apartment in October 2005, a problem had appeared: when the picture was intense -- for example, a bright solid color like white or orange -- the screen would "scroll." At first, it was annoying, but tolerable. Eventually, however, the picture started to scroll all the time. This happens both on Composite and TV Tuner input. However, it is completely fine on Component input. I'm not able to test S-Video because it looks like one of the pin holes on the input connector was damaged at some point. At first, I thought the problem might have something to do with NTSC decoding, but I realized that the component inputs are NTSC encoded as well, so that's out. I've worked as a computer technician, so I'm fully capable of making any repairs to this set that are needed, but I don't have experience with TVs, so I don't know how to troubleshoot. I've thought about de-soldering the S-Video connector, in case that whatever damage is there is affecting the picture. However, since it's only one pin, I can't fathom how any damage would cause a short or anything that would disrupt the picture. Since this was a progressive-decay problem -- i.e. it started with the bright picture and then eventually started happening all the time -- I'm a little stumped as far as troubleshooting goes. Perhaps a capacitor slowly died on me? I don't see anything exploded or badly soldered inside. Any ideas?

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Kim Yearick

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It certainly sounds like a defective capacitor. Was the storage area hot? Electrolytics can dry out and change value over time or flat out short out. They don't cost that much and it sounds like you know what you're doing around TVs. I would start in the vertical circuit and replace all electrolytics. Also look closely at all connections with magnification and solder anything which looks suspicious. If you have a scope and know how to use it a check of various waveforms should identify the culprit. Good luck and remember safety.

Posted on Jul 18, 2006


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