I'm working on the above mentioned set for someone. Symptom is no picture, sound is fine. At first it was intermittent and would respond to smacking it but now it doesn't, as is usually the case the owner continued to use it for about 9 months until it quit entirely.
CRT heaters glow, some HV is present as indicated by a small pop when I discharged it immediately after shutting it off, however the HV appears to be low and doesn't make the usual static sound when turned on. I forgot to take my HV probe with me when I was out there so I couldn't verify this though. I did touch up a few suspect joints, checked the semiconductors in the horizontal/HV section and didn't find anything suspicious. I'm planning on taking another look at it but bringing the HV probe but that'll have to wait a few days. Also there's a gray block connected between the flyback and the tube, at first I thought it was a doubler but then I realized there's no ground connection, no connections of any sort other than the red wire going in and another coming out. What function does this serve?