This set is proving to be a tough fix. I picked it up in the trash a while ago, and when I first tried it everything seemed to work fine. After about half an hour though the picture went very dark and shrunk in on the sides. The problem is permanent now and will not go away. All voltages on the secondary of the flyback - HV, CRT filament, etc. are about 30% below normal but the B+ is a solid 136V. All voltages from the power supply are good, and there are no bad caps... it seems like the horiz. drive signal isn't strong enough. I tried replacing the horizontal driver transistor as well as all electrolytics in that area, and fixed some cold solder as well, but it made no difference. Any ideas?
- posted
13 years ago