A year later, finally some success with lighted buttons!
EDIT: Long-time readers (hah) may remember about a year ago I attempted to upgrade the arcade cabinet control panel. Mostly it worked, but unfortunately I failed at hooking up the LEDs. Yeah, I wired all 24 LEDs backwards. That's 48 solders, 96 wire-end-strips, and 8 crimped disconnectors all that needed to be removed. Luckily, the ridiculousness that I went through to get all 24 resistors connected to the controller board still was usable.
I finally got around to looking at this again, and after ordering a new set of LEDs and a close inspection of what I needed to achieve, I have something working. The photo shows player 4's buttons lit up in glorious yellow. Unfortunately that was like 2 hours of work. Hopefully the last three players go a bit faster now that I'm back in the swing of soldering.

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