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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

Seeing these dried/cracked solder joints brings back memories. CRT sockets and switching or flyback transformers were the first things to check.

That’s why people used to slap their TVs back then, to fix issues.

[–] • 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.