Zenith SG5745H9 Pincushion

[rwagoner]

Does anyone know what to look for on a Zenith "Advanced System 3" 27-inch console (I assume on the 9-754 sweep board) that would cause a sudden pincushion problem?

This is the TV that I have written about before; it isn't used much and my son wants it more for video games than anything else. It had a "jumpy" picture previously that would eventually go away if used a long time or if NOT used for a long time. Tonight I happened to try it and it was working perfectly for about ten minutes, then got "jumpy" (as if the picture were moving up and down an inch or so), then suddenly developed the pincushion problem. It came on suddenly.

Interestingly, though it may just be coincidence, when the pincushion problem appeared, the picture stopped being jumpy.
(EDIT: It was coincidence, but I did discover that turning the TV off and on a few times stopped the jumping).

The other board is a 9-959 main module.

Thanks

Also edit ... if it's not worth repairing, does anyone in So Cal need a set with a picture tube in excellent condition?