Hi, this is a long shot attempt at doing my own keyboard repair.
My friend cleaned his Matias Tactile Pro with soap solution, and it can't work anymore. Passed me his kb. I tried soaking the PCB and keyboard controller in alcohol, then scrubbing with toothbrush. When connecting to computer, it can kinda detect, and occasionally can type a few letters, then the connection is broken again. So there is a 'detecting, then disconnected sound' cycle going on when I connect to Windows.
I think it might just be the kb controller being messed up by soap, since the PCB basically looks all ok. Whole kb is very nice and clean. According to friend, not a single key was dead prior to the kb dying.
So I would like to buy a kb controller off anyone who doesn't want his Matias board anymore because of their crappy repeating key problem. Maybe I can revive the board!