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It's probably a filtering problem. I used to repair hoards of video poker monitors for the casino industry and these typically ran 24/7 for years at a time. All various makes but one problem in particular- washed out screen with a bright band off to one side was always a bad B+ filter capacitor.
I'd first try checking or replacing the higher voltage electrolytic off of the B+ line near the HOT or flyback. They were always just dried out, but visually looked fine. Probably a 250v cap, 10 to 22uF, but I just don't know for sure on your Sony.
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