I was right. It was very easy to fix.
There were really only two tedious parts to this fix. The first was getting into the keyboard. There were a lot of screws but - to the credit of the designer - they were all visible and easy to undo. Usually manufacturers put screws under the rubber feet of their product. This was not the case here.
Undoing all of the screws not only released the case, but it also released what I'll call the key shelf from the enclosure. So the two octave shelf was dangling by its wires. No worry, they were strong connections.
There wasn't much to this device. I'm not shocked or anything, I just didn't know what to expect. There are also a few more discrete boards than I expected. But I guess that makes sense, given they make larger versions of these boards and they probably want to reuse these parts and space them out across the interface.
When I plugged the keyboard in, it would get power, but it would not actually identify with the computer. So my first instinct was to check the USB connector on the IO board.
It looks like someone already tried to fix this and didn't do a good job. The ground pin of the USB connector was not connected to ground. This is what I fixed first. It probably doesn't matter since the whole connector is grounded, but it probably didn't hurt. This was the second tedious thing: the solder would not stick to the pin or the board - likely because the pad was burned away from bad soldering (I'm not much better, but still.)
This still didn't work, so I tried to find another pin that was not connected properly. One of the data pins - I think it was D+ - also wasn't making contact. When I resoldered that (with much struggle since the solder wasn't sticking there either), the computer recognized it immediately.
I'm not a fan of writing small projects like this but I imagine I'll have a bit more time next month to actually get some more interesting stuff done. But hopefully this helps someone.
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