1980 Sears (Sanyo) 25" Console TV CRT Problem

[radiotvnut]

Does this TV have a focus divider in the HV circuit? This will be a big resistor with one end connected to the HV anode lead, one lead will go to the focus connection of the CRT socket, and one lead will go to the focus control. If this focus divider shorted, it would place full 25-30KV on the focus pin of the picture tube and that could very well take out the CRT, as well as the tube socket. Also, take the CRT socket apart (if it will come apart) and make sure there is no evidence of arcing. It's also possible that the HV is running way too high, resulting in arcing and damage to the CRT. Zenith had that problem where the HV would run so high that it would arc and break the neck off the CRT. This was all due to the safety cap in the HOT collector circuit opening. Then, test the new CRT to make sure you didn't ruin it.