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I wonder if this could be horizontal garbage on the contrast control line? Can you see any pulses on the contrast control? Are all caps connected to it good (C7, C6, any others that may be off the edge of the schematic you posted)?
Edit: you could try bridging these points to ground with a spare 50 microfarad.
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Old TV literature, New York World's Fair, and other miscellany
Last edited by old_tv_nut; 11-11-2019 at 03:54 PM.
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