vertical lines in a Toshiba TV

[Alex KL-1]

Trying to imagine/figure about it...
Definitively, is very difficult to estimate where the periodic interference are being injected. Things like already said here crosses my mind, and also about ground or reference tracks being (almost) cracked, almost invisibly, near opening (high resistance).
Or, most unlikely, but not impossible, the jungle IC with a strange internal fault.

[vol.2]

Originally Posted by Alex KL-1

ground or reference tracks being (almost) cracked, almost invisibly, near opening (high resistance).

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.

Or, most unlikely, but not impossible, the jungle IC with a strange internal fault.

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.

[Alex KL-1]

Another thing very unlikely for a SS set, but anyway: the image are compressing at the bands positions? Tube sets sometimes makes that. Just seeing another thread. But, by design, SS systems are less prone to that.

OOPS, nevermind... it varies with bright, cannot be this cause.

[vol.2]

Originally Posted by old_tv_nut

Yes, it's possible this is a design flaw with this chassis, but it's so clearly visible in your photo, I wonder. I presume the bars don't move wildly, just get stronger or weaker when you change brightness?

No, the bars don't move at all. They are completely static. Depending on the brightness, they can appear to be either lighter lines on a darker background or darker lines on a brighter background, but I believe that's normal and is just an illusion; as the brightness value gets higher, the lines seem to disappear because (I assume) the voltage level on the raster overtakes the resolution of the lines (causes it to bloom over the bars)

You might try running added ground wires between boards, not following the path of the original ones, to see if it changes. (Still grasping at straws here.)

I could try that. I have to admit it seems like a long shot, but why not.

Originally Posted by Alex KL-1

Another thing very unlikely for a SS set, but anyway: the image are compressing at the bands positions? Tube sets sometimes makes that. Just seeing another thread. But, by design, SS systems are less prone to that.

OOPS, nevermind... it varies with bright, cannot be this cause.

Yeah, also, it definitely doesn't warp a video image at all. I see no compression.

In fact, if a busy image is on the screen, I can't see the bars at all. It's only noticeable in areas of solid color or grey.