I have a 36" tube Toshiba - model CF36G40 (Jan 97). The screen will sometimes shrink vertically with large black bands top and bottom. Sometimes it will actually expand such that the top and bottom are cut off. It does not seem to get worse or improve as the set warms up, but it is more frequent when watching a letterbox program.
I replaced capacitors C305, C308 and C320. Also, I reflowed some suspect looking solder joints while I was in there. This did not help at all. Same problem exists.
Any suggestions? I've read that C301 causes other problems. Any particular caps that I should replace or chips to reflow solder on maybe? I have a normal cap tester not a high frequency unit.
Thanks in advance. I normally work on rockets or pinball machines, not TV's.
John Cocoa Florida