Something a bit different than I usually do. Headphone jack broke off inside the Audio-Out socket. Jack in socket means the sound is getting routed away from the built-in speakers, and broken jack in socket means headphones can't be used either, so the keyboard was unplayable.
It's all chewed-up because the husband made an attempt before the wife brought it to me (there is a reason the industry refers to these kind of well-you-tried repair attempts as "dad fixes": it isn't always the men who do this, but most of the time it is the men who do this).
Opened up the outer shell and removed the circuit board to make the approach easier.
Inside a CT-1S Casio keyboard.
The circuit board. Damaged piece is the leftmost black cube-shaped bit at upper left.
Another view of the messed-up socket:
Did I win?
Hell yeah I did.
Approached it the same way I extract broken screws (grab it from the inside with a drill bit). The part that took longest was getting past the shredded plastic to find the jack itself in the first place. 3.5mm jacks are hollow, so I didn't even have to drill a pilot hole first. Once the bit grabbed enough that the plug carcass began spinning in the socket I twisted it until there was a piece sticking up far enough out of the hole that I could grab it with pliers and yank it out.
Bonus: I thought for sure the Audio-Out socket was going to be trashed after this, but it still works.
