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Gain control feedback. Older sets had an agc and buzz control for this. Try fine tuning at his stage to see if it goes away. I had an 87 zenith 25" do the same in video games. Seems to be a signal overload. Try another video decoder assuming you use a VCR to convert video and audio to 75 ohm. Try a different VCR.
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Honey, turn on the tv.. I'm cold!
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