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nildram
4
Feb 27, 2017
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Unfortunately the Ergodox I just finished assembling has 3 keys not working. The defaults mappings for the non-working keys are `o`, `k`, and `.`.
This keyboard is from the delayed drop of last summer. I was a little heavy with the solder, but nothing looks to be shorted.
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How can I diagnose the issue? Appreciate suggestions from @Parak or anyone else.
Feb 27, 2017
MagicSmoke
350
Feb 28, 2017
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s12 and s27 are in the same electrical column. s17 is not. I can't see an easy correlation. Perhaps there are two problems.
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Feb 28, 2017
daijizai
25
Feb 28, 2017
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No offense @nildram, but Were you soldering with a flame thrower and a potato? That poor board. You probably have some cold solder joints - In fact at first glance I am almost positive. Fix the cold solder joints and you should be good to go. Recommend next time using a helping hands and a magnifier. Also, so much solder!
Feb 28, 2017
Parak
89
Input Club
Feb 28, 2017
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That is definitely way too much solder on all of the joints, and the blobs are obscuring any potential issues. Remember, if you can no longer see the switch pin, you've gone too far - a volcano shape is the goal. The joints also look cold, as they are not flowing correctly, possibly a result of an iron with insufficient thermal capability and/or an oxidized tip.
First try closing the contacts with a paper clip. Does that generate a keypress? Got a multimeter? Put the leads on the contacts in continuity mode, and press the switch, see if that gets you a keypress.
Feb 28, 2017
nildram
4
Feb 28, 2017
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no offense taken, I was a bit embarrassed about posting the image, appreciate the feedback.
Feb 28, 2017
nildram
4
Feb 28, 2017
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Thank Parak. Appreciate the suggestions!
Yes, the iron is pretty old, so that's likely.
> First try closing the contacts with a paper clip. OK, I'll give that a shot.
What is continuity mode? Quick google did not reveal.
Feb 28, 2017
Parak
89
Input Club
Feb 28, 2017
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http://en-us.fluke.com/training/training-library/test-tools/digital-multimeters/how-to-test-for-continuity-with-a-digital-multimeter.html
You can also use older multimeters without audible continuity in ohms range (they should read close to 0 when switch is closed).
Feb 28, 2017
MagicSmoke
350
Mar 2, 2017
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I finally looked at the traces. O and . both go to the MCU via the larger pad for L. So if L works it is not likely a trace between L and the MCU. It would seem to be a soldering issue.
Please remember that you can't judge a man's soldering until you've worked 5,280 connections with his iron.
Mar 2, 2017
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