(Topic ID: 208482)

Stern Display Segment Problem

By oldschoolbob

6 years ago


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#3 6 years ago

First step with bad segments is to replace the related transistors

#5 6 years ago

Bad in any way, it's usually the transistors for me or occasionally the BCD decoder.

#9 6 years ago
Quoted from oldschoolbob:

I just pulled up the base of Q17 and decoder pins 12 and 13 still show a short. I think the decoder is shorted.

Definitely seems like the decoder has a problem then, but do the transistors test fine? Something had to damage those pins on the decoder. It could have been a one time spike or something and the transistors are fine, but I'd test them after replacing the decoder to be safe

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