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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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[–] • 1 pt

Remember the sets that had those terminal strips with the solder pots that would crack from heat stress? I do not miss that at all.

[–] • 1 pt

"Easy pizza" fix, like likes to say.