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Probably the flyback. I had a CTC177 do that and I found a good flyback from a junk board and fixed it right up. If your screen is scratched, you're probably doing the right thing by letting it go. My flea market friend found a late '90's 25" Magnavox at the dump with a couple scratches on the screen. All that was wrong was a small blue disc cap going from the HOT collector to ground. I've seen the problem many times. The set makes a nice picture; but, anyone who has ever been interested runs the other way when they see those scratches.
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