Question about Panasonic AG-1980 S-VHS VCR

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Colour Noise and Dim Display

I have a Panasonic AG-1980 I use for the home; pretty expensive investment so I hope I can rescue it. Playing back VHStape shows wavy diagonal red & blue stripes on the screen. S-VHS tapes are considerabley better, but still show fine interference patterns. VHS recorded on it seem to play back on other machines fine. Last year, the front panel display worked well only part of the time. When it worked at full brightness, I could hear a high-pitched capacitor squeal, now the display is very dim and it needs to be in a very dark room to be effectively used. I have the full service manual.

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Don Roth

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The display on the AG-1980 goes dim mostly from old age - replacement of the display usually cures the problem, though you may need to replace some or all capacitors in the power supply. The diagonal stripes are usually caused by a defective video amp/filter IC on one of the video boards. If they are still available from Panasonic, they're about $40.

Posted on Jun 29, 2007

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You may have a slightly damaged power supply...although swapping the main supply chassis may solve, I have seen front panels that have an additional supply section. look on the front panel board for any TP's and probe with an O-scope. if you see a TP that may also show (+ xx V), where xx is a numerical value-may be one x only, the scope must show a straight horizontal line that is shifted vertically away from its normal (ground) position. that confirms a DC value present. then determine the DC value of the shift. Another possibility, since you invested, is to search ebay for a second unit for part swapping. look for as-is units.

Posted on May 27, 2007

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