Dead Board?

[Dropout]

Hey there,

I've bumped into a problem that I've not seen before and wondered if this rings any bells for anybody.

I'm using a Filco Majestouch 2 tenkeyless which has been fine for a while - but I've been getting occasional phantom keypresses, I've recently caught it in the act, where pressing the T key also registered a hit on 5 -- Sort of like if you'd spilled some gunk on a rubber dome board



More frustratingly, occasionally, hitting Left Ctrl will send down a LeftCtrl, and also Shutdown or Volume Mute -- two keys which don't even exist on the keyboard, which is the most confusing thing.

Giving the keyboard the slightest of nudges always fixes the problem, but Its getting a bit untenable with my machine attempting to shut down multiple times a day when I'm working so I'm looking at replacement but was just wondering if anyone has any brighter ideas?  Ta!

[tp4tissue]

take it apart. check the switch.

If it's chatter,  just replace the switch.

If it's a cracked PCB trace, you'll have to look for the crack, and either bridge, or jump it.

Cold solder joint also possible, just touch it up.

[Findecanor]

It sounds like there is some junk inside your keyboard that is conductive, and which bridges signals between component pins that shouldn't be connected. This could happen if you have spilled some liquid on it.
It could also happen with a bad solder job that would bridge contacts that are close to one-another. Or if a diode on the circuit board is broken.

I would open it up and take a look! The controller's circuit board is on a separate socketed circuit board mounted on the top side of the PCB — with several pins close together, so there is where I would look first.