What is it?

The issue that is number one is brightness. The screen brightness is turned quite high. So the set will be used on occasion like a specific show/movie that would have been watched back then. As it runs more often, the little flashes and interruptions as circuits come to life tend to take less and less time to correct themselves. I wonder if updating caps could fix that, it did on my older black and white set.

The color is superb considering a digital tv broadcast in hi-def is being run through an analog out RF coax. I think that makes sense.

The sound has a hum, so that could mean replacing filter caps? I notice high hum in other instruments and the feedback tends to mean replace capacitors, canned or otherwise.

How many scanning lines? Still 525? I have some color tv theory books to read, and the general Pinpoint TV Problems in 15 Minutes book, I like that one. It's been helpful with my black and white tv that I screwed the alignment, I'm still going slow to absorb that material and learn to use testing equipment.