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I have found that these kinds of sudden issues that happen after doing a big recap or repair can be often caused by two things.
1) there are some broken solder joints on the PCB and you disturbed them when you did the repairs. you will not be able to see them with you bare eyes in most cases, they require a microscope to see them and even then they might not be visible until the board is running and heats up
-solution is to reflow the boards. pay special attention to connectors, heavy or large components and any area that looks burnt on the PCB
2) the G2 pot on the flyback is wonky and if you touch it, the brightness jumps around. easy to verify by poking it a bit or putting some upwards or downwards pressure on the screen knob while the set is running. be careful, if this is the problem, it will not take very much pressure to make it happen. be very gentle and don't touch it with your hand when you do this, use a long plastic thing
if this is the problem, it can sometimes get better with some deoxit or something like that, but it's usually unfixable. you can also sometimes get it to the right spot and fix it in place with a little loctite, but i won't promise it won't move after that. plan on looking for a new flyback. good news is that this is less common (but i've had it happen to me a couple of times)
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