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If memory serves me, you will find two MCZ3001d IC's on the power supply board. These usually give the trouble you described. If there is only one the trouble is in the zero crossing switch circuit. Due to the shear weight of these sets I don't repair them anymore (back is bad enough now). The new IC's are MCZ3001DB. It is supposed to be an improved version. Buy three at least as the sets are picky about them. They don't blow up but if the set doesn't like one of the new ones it won't power up, just blink.
Use IC sockets when you replace them. The sockets make finding IC's the set likes easier to change.
Some customers with those and the Mitsu 40's love em 'cause they are theftproof!
Even the back of these sets are heavy!
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