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Mac SE/30 flickering

Mine had a similar issue years back. Kind of hard to tell, is there any sort of crackling sound when that happens or not? Is it constant or random? Are you able to boot, read and write floppies, access hd, etc no problem or are there any errors?

Very minor chance it could be a bad ground in the back, the power supply to chassis connection. More likely power supply or flyback/ab related. Has anything in it been recapped?
 
If it's been happening a while, then yes, I'd lean towards what the above said. Remove the old solder and use new,don't just reflow.
 
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