[TV MAN]

To me the picture looks "bloomed", as in low high voltage. You're probably using a set top box, which will cause the dark spaces at the top and bottom (normal), I'm also observing that it looks like most of the capacitors are originals. Those should be replaced, which is some work, but could be some are 'leaky', causing a drain on your power supply. I don't know what your abilities are concerning TV service, but you should have around 14kv on the anode of your CRT (picture tube). Some immediate causes would be a bad 1B3 high voltage tube. They tend to go to air and are readily available on different sites. You could look for a violet/blue glow from the HV tube,(inside the high voltage box) connecting to the flyback. If you see that, the 1B3, its bad. But that glow ON the glass (of other tubes) doesn't mean the tubes are bad, unless its inside the elements, which IS bad. Also, be very careful not to break the lead off that flyback transformer. It looks like the damper tube has some use on it. This could be causing your problem too. Usually you replace the horizontal output and damper as sets for good measure. This would probably solve the immediate problem. I doubt the picture tube is bad, those 17" usually last a long time. Mr Anderson has a lot of good videos on these and might jump in here too. (BAnderson tv on youtube) Also, IF you do try to test the picture tube, it is probably a 2v filament, so be careful.