(Topic ID: 62956)

Can you help diagnose this Whirlwind display?

By jtaudio

10 years ago

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Latest reply 10 years ago by jtaudio
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Whirlwind Williams, 1990

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Everything works fine expect the top display is missing the upper right diagonal segment shown in the lower display. Hoping someone can narrow down where the problem may be.

Thanks!

display.JPG

Thanks for the reply. It was not U16 so still stumped!

I think there are multiple UDN7180's ( four ?) so take a look at all of them.
I had the same problem with my WW display segment and it was one of the 7180's.

They are getting harder to find and more costly to replace.

U16 is the 7180 that drives the "K" segment on the P1 display (the one not working in the photo.)

Next thing back in the circuit is the 4049 at U8.

viperrwk

Thanks for your suggestions! Just wanted to follow up. Turned out to be a problem with the glass strip itself and not the chips or solder joints on the board.

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Can you help diagnose this Whirlwind display?

By jtaudio

10 years ago

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