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Have you checked your convergence correction Amplifiers? These usually go bad. I believe they are the STK392-XXX (XXX stands for the last 3 digits) Mitsubishi uses the 500 series,They should be replaced with new ones and the bias resistors need to be changed also.
There are many other sites that can help you install the ICs but this one is very accurate.
If you need any help in removing and replacing the ICs let me know and I will be able to walk you through the process(be prepared to take picture to help me see what you are looking at so I can help faster.
It sounds like the TV has a Circuit problem in the convergence circuit. If it comes and goes then the concern can be corrected by re-soldering the 'conv' output IC"s. A semi-minor repair and cost.
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