Magnavox CD4756 (T989 chassis) dark bands down left edge

[old_tv_nut]

If you have replaced all the caps in the H sweep circuit it must be something else. I don't know, check caps in horizontal oscillator and amp sections?

Cracked circuit/solder traces taking one of the safety caps out of the circuit? Can you check connectivity from the horizontal output collector to the lead of each safety cap?

I was going to suggest looking for a capacitor mounted on the yoke, but I don't see one on the schematic.

[James_S]

I checked the safety caps and they're all in the circuit, they're distributed around the horizontal/HV subchassis and a bad connection would result in other issues. I've replaced almost all of the electrolytic caps in the whole set except for a few that are on the chassis and those test ok in circuit. I don't normally do shotgun re-capping but I was running out of ideas. I wondered if there was a damper resistor somewhere that had opened but I can't see anything on the schematic, I don't see any components on the yoke. I'll keep looking.