Dead Apple Keyboard II Repair - where to start ?

[Dj Mike]

Anyone ever repair one of these ? Where to start repairing one. Apple Extended Keyboard II - I already have it apart. It's an ALPS version.
Nothing is broke physically, but there is no response when ANY of the keys are pressed.
I'm relatively new to repair work, so I need a dumbed down version the first time around.

 

[GiGaBiTe]

Start by checking continuity, if the keyboard is not responding at all, I'd suspect something like a broken wire or solder joint.

Beep out the ADB cable and make sure all four wires are good. Also make sure the connectors to the PCB inside the keyboard don't have cracked solder joints.

 

[AndyO]

I had one a few years ago where the tiny surface mount fuse had blown due to it being connected or disconnected while the system was powered up. The symptom was the entire keyboard was dead. Fairly simple repair, and worth checking.