This is a very common problem with the macplus. When I was just about to sell one back in 1987 it was doing the same thing. I sold it anyway but maybe should have fixed it had I known what the problem was. I found out years later that if you have the problem of screen shutdown it is the connectors on the analog board that supply high voltage to the crt. that are the issue. These are the very sturdy pins that connect the board to the crt. Best idea is to clean this area on the board and resolder the pins. Done this with a recently acquires macplus and all is fine. Good luck
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