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Lots of issues in the (1970s) digital displays. Some parts are bad, some capacitors are dry, but I followed the problem back to it's source.

A single cracked solder joint on the isolated driver supply. The old heavy transformer, mounted vertically, on a PCB trick.

It pays to look at everything in the trouble area when you have a problem. It may not be exactly what you think it is.

Lots of issues in the (1970s) digital displays. Some parts are bad, some capacitors are dry, but I followed the problem back to it's source. A single cracked solder joint on the isolated driver supply. The old heavy transformer, mounted vertically, on a PCB trick. It pays to look at everything in the trouble area when you have a problem. It may not be exactly what you think it is.
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[–] • 3 pts

Your criticisms are duly noted and summarily discarded.

Often, we get messes left behind from the former owner's attempt at repairs. This one has quite a few in it. I've already cleaned up a lot of crap on the mainboard that looked like this...I assume the person I bought it from was easteregging things.

Lead-free solder does not enter this house.