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I fixed a number of those, back in the '90s. Cold solder joints on the horizontal driver transformer, the horizontal output transistor, flyback transformer, and on the HV capacitors are common and they often won't look bad. Sometimes, all it takes is a micro-crack in the solder joint to cause problems. Also, that yellow capacitor on the right- hand side of the board would sometimes arc and burn. I ran into a few bad flyback transformers on these and if yours ever goes, you can probably hang it up because they were NLA 30 years ago.
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