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Originally Posted by Alex KL-1
ground or reference tracks being (almost) cracked, almost invisibly, near opening (high resistance).
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Not impossible, but not likely. I reflowed the whole board for sure. If there is a crack I could see, I think it would be covered over. I could check again.
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Or, most unlikely, but not impossible, the jungle IC with a strange internal fault.
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I have already tried replacing the jungle IC. I have three of them, I could try the third one I guess. Maybe both the first two are bad, but I sort of doubt it.
I've also replaced the flyback trying to fix it. I found the original Toshiba part NOS.
Another thought crossed my mind, is that maybe this fault was here in the original design of the set, and I didn't notice it before I recapped it. When I first got it, there were so many bad components (basically all the caps in the deflection and PSU section) that had to be replaced to get it running that I didn't have a good baseline.
If this is true, and the set normally has these bars in low grey areas, is there someway to cure it by adding components?
I tried a few things already like putting low value caps on the neck board between the Grid and the Cathodes, and I did some shielding for the flyback, but I'm not sure if what I used was enough.