Ugh, modern crap.

This Korg i2, or some such stupid name, has a busted backlight. I think. Either way, I've replaced the backlight and I hope that was the problem, because I can't find any specs for the dang thing, and the complete service manual that I have is pretty much useless. All it has is scratchy little photocopied diagrams of where the screws are...

Pretty common situation.