How to stop "short" between 2 keys
Once upon a time, a friend gave me this keyboard, that was not working properly since day 1, and he got it replaced but they did not asked the failing keyboard back.
So I'd like to repair it to give it to a friend with a lame keyboard.
This is a mecanical keyboard, here is all the references I can give you :
There is some kind of short circuit between key " 3 " and " 4 ", meaning that when I type either of theses, both fires.
So far I tried to de-solder both and re-solder them and checked with a continuity test that there was a indeed short between the keys.
There was no visual problem with the cherry MX switches that I re-soldered and no visual problems on the other side of the board either. But I may be wrong (?).
Here is a picture of the logicboard centered on keys " 3 " and " 4 ".
Here is a close up shot of the traces of the PCB on failing keys :
And there is a close up shot of the traces of the PCB on normal keys :
I have solder and electrical tools but I'm "short" ( ;) ) on ideas on how to fix it.
Thank you for your time !
Edit 07/03/17 :
I tried to de-solder the diode you asked me to test and I'm having difficulties to pry it out. It feels like I would need to heat it more but I am afraid I might kill the diode in the process. Still I can confirm that it's soldered on a pad and not in a " hole " since I can observe some other places where there is no key and where there's still a key slot with all the pads and mounting holes.
How to you feel about it ?
Also the more I think about it, the more I wonder why we should do that.
The only anomaly we found yet, never seen on other keys is on the 2 big pads on this picture :
Es esta una buena pregunta?