I have a Sampo color TV from the early 80's which has what may be this problem from the sci.electronics.repair FAQ:
The bars I'm seeing are 1/2 to 1 inch wide, with 1/2 to 1 inch between them.
I have the schematic and can do my own repair work, but needed some help with the troubleshooting since I don't have a scope or signal generator. For a small fee, a local shop marked 10 caps on the schematic for me to replace. None solved the problem- in fact of the
10, 2 were not even on the board. On the second attempt, their tech claimed to have tracked a signal from the tuner to the final video driver and everything seemed fine. Their final answer was "the tube must be bad".I'm not ready to give up yet. The colors and picture quality are fine, except for vertical stripes of increased brightness across the screen. If I can fix this set I'd really like to, as it is the last piece of "repairable" electronic gear I will probably ever own. Repair shops will not fix anything this old, for obvious reasons.
All advice appreciated.