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I once got about a year out of a Sony with a weak CRT by boosting the hearter voltage to about 8 v (you'll need a true RMS volt meter to measure this). I just added my own winding to the flyback and disconnected the built in one. I think it also had a H-K short. It ended up looking pretty good after that. I ended up selling it cheaply explaining that it will probably only last 6 months to a year at the most. They were happy and bought another set from me when it finally failed.
What does the picture look like when it's not blanked? If the CRT is weak, one color will be dim and blurry, but the others are probably fine. There are other failures that could cause these symptoms, but 9 times out of 10 it's the CRT.
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