150's apple code name is Jedi. hence all the Jedi boards inside. |)

IIRC I have sound and I cleaned the backlight and contrast sliders have to double check on the sound thing. I'm about to give up on this particular machine, already has issues with the power input (have to go through the battery connectors to power up) and the case is not great, lots of broken plastic on the screw mounts. I'll test it again later this week and if I have sound still I'll give you my interconnect board for experimentation (I'd just ask the cost of shipping) if I don't have sound I'll be watching this thread for the solution