deskthority

Well, it is a non-authorized shop that does component-level repair and microsoldering. So while this is not their core expertise, they should have some experience in fixing electronics without having access to all schematics, and in getting scarce parts. It sounds (or at least I hope) that they made ...

If anyone is still interested: I finally gave it to my local Mac repair shop. They apparently tried to fix it with an aftermarket controller chip, that apparently gave up after their testing. They say thei're now trying to source the original controller in Asia...

Just as a quick update: I'll have to find some time for this, but I'll try to get back and let you know how it worked

I'll try the reflow, but are you sure that this is a shift register? It is not a chip, and looks like a SIP resistor array to me...

Hi, sorry I didn't have that much time for explaining. I unsoldered the diode too, for testing.
However, all the capacitors I pulled and the diode all seemed to check out okay when I measured them. When I reconnect the diode and the capacitor next to it, the problem resumes...

What confuses we is ...

Unfortunately pulling the capacitor only stopped the erroneous "keypress", but also stopped the keyboard from working.
Here are pics of the board, I marked the missing caps.

Hi,

I've got a Cherry MX 5000 that I've been using since 1996, and it now stopped working after I removed the keycaps for a bit of cleaning :cry: .

I initially though that a key must've got stuck, but when I disconnected the whole keyboard from the controller PCB the problem persisted.

Symptom ...