Toshiba ce27f15

Question

I have a Toshiba CE27F15 27" TV, vintage 1996.

The video input works fine, but the cable input is breaking up the signal, audio and video. It's thermally sensitive, as the problem improves when the set warms up for 20 minutes or so. Sometimes it clears completely.

I haven't cracked it open yet because I don't have a schematic.

Any ideas where to start? Is there a free schematic available somewhere on-line?

The set works great other than this, but it's not worth putting much money into since it's so old. But I'd like to give it one good attempt at a repair.

Thanks, All...