Question about Panasonic AG-1980 S-VHS VCR

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Noisy video on tuner input

I have several of these decks, and a few have developed noisy video, but only from the tuner. The noise resembles a moving herringbone pattern. I've swapped out the tuner and mpx board with a known good one. I even swapped out the power supply. No difference.
Any ideas? Tracing the tuner video throught the deck is about as far as you can get from easy. The service manual offers little encouragement.

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  • HadYourPhil Jan 14, 2008

    It doesn't seem to be the tuner. I was able to greatly improve the picture by replacing the caps on the timer/display board. Those are notorious for failing and darkening the display. I'll try the main power supply next. Those switch mode supplies can be a bear!



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Well, if replacing the tuner did not solve it, the next likely culprit is the power supply. Does it look OK on A/V cable input? You didn't say what brand this is but all the older Matshushita made VCRs (panasonic, sylvania, quasar, magnavox ond others) have power supplies that fail often in this manner spewing out noise that interferes with the video signals. Some of us know how to repair the supplies as they are usually not available for replacement.

Posted on Dec 28, 2007


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