Non-functioning as in built but doesn't talk to the player. I've done what trouble-shooting I can (checked the output of the tuner's regulators) but without a schematic its hard to go farther. The trouble must be something fairly basic because AFAIK all I would need for the player to see the tuner would be a functioning PIC.

I've soldered a lot of connections in my time and have inspected the boards and can't see any obvious mistakes.

-- Craig