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Sounds like flyback/focus divider failing. The CRT on this set shows color tinting when it starts to fail and then ends up not drawing enough current to get the set out of video mute. I don't know if that flyback assembly is available or not. I would not use a generic replacement if one is available since they can cause Sonys to give all kinds of weird symptoms. The screen circuit is in the flyback too (if I remember right) and that could cause the flashing.
Have you ever changed the MCZ3001DB IC's in the power supply? These are common failure also but they cause the set not to start sometimes or just go dead. They won't cause the symptoms you are having but they can make you sratch your head a good bit!
Also, does yours use the fine pitch picture tube?
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