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My guess is... did the screen control on the flyback get moved? I've seen that control get flakey-intermittent too and need rotating back-and-forth a few times to make good contact, then set it til the lines disappear, I assume this set has a focus and screen controls on the flyback assy, if not, disregard!
(I had an NEC 30" set that needed a little tweaking to the screen control a couple of times in its 20 years of service, same symptom)
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