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I had a similar issue on my 2004 super-fine-pitch HD Trinitron. Gray scale would intermittently get too red red and green would smear and eventually it would shoot so red it would trip the protection circuits and shut down....a smack before it reached shut down would usually bring things back to normal...got sick of the problem and reflowed the solder on the red amp IC and heatsink and it hasn't misbehaved since.
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