63 silvertone roundie
 

hey all, this set developed rgb retrace lines from top to bottom they are faint but i can see them which were never there. crt bias counter clockwise and the rgb drives are low. any quick fix that anyone may have an idea befor i go full blast into this set to look?

The color is working right otherwise? Do they go away if you turn the color all the way down?

color down they are still there, otherwise its working great.

Are they only visible in "low light" or "high light" areas of the video? Or all the time?

high lights in the video it can be seen.

Most TV sets use a pulse from the vertical output to drive a grid in the CRT to make the CRT cut off. If the set sends the video to the cathode, as most do. Bad capacitor?

Are you trying to watch a DVD or tape with Macrovision pulses in the vertical interval. These come and go every minute or so.

Have you checked the video output tube for shorts? It's probably a 12BY7 if it's an 11 or 12 clone. When mine developed a short the exact symptom you described showed up.

no dvds just tv. a cap, in the vert board?

red green and blue bars running up and down?
That is one I have never seen. Almost sounds like some low level ripple getting into the chroma board. Maybe a heater to cathode leak in one of the 6GU7s or other tubes in that area? Weak filter? Video tube with some weird condition like mentioned.

I would start pulling the tubes behind the 6GU7s out one at a time with the color off and see if it you can get it to go away.

the 3 color lines are left to right but each section of bars start on top and kind of fade toward the bottom.

Can you post a picture? It would be most helpful.

probably not be able to see them as they are very light.

I'd also look at voltages around the video output as well as making sure the service/normal switch is good and follow out to the drives and do some resistance checks/troubleshooting in that area. Do brightness and contrast work normal and is there any effect on your symptom?