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there is a lot of ways to approach this. replacing caps is one. diagnosing and replacing in the offending area is another. Tube subbing (like the video out) and the CRT, is a way. Using a scope to see the signal is good. there are so many ways its just you need to decide what your end game is.
If you just want to watch a tv, I would start with shot gun of caps, they are not expensive,there are not a lot, and it may help.
If you want to learn to diagnose, then I would get the scope out and look at the wave forms while replacing caps/making sure tube sockets are clean/pots are clean and look to see whats going on with each change. I think of TVs as a learning tool, so a few problems are a good thing. If you are getting a good signal to the CRT and good HV, and it still looks bad, then its prob a weak CRT that is having to be driven to hard. But remember this is a low end set, no DC restoration so black levels will be all over the place.
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