I have a working PB 190CS which I've put together out of parts from 2 broken machines, both 190CS models. However, the working motherboard is missing the audio jack on the rear and there is no sound from the speaker. The case it it's in has the audio jack punch-out open as if there should have been a jack there, so I'm not sure if there was originally a jack that was removed somehow at some point. I also haven't disassembled the screen to make sure there's a speaker in there, but it seems unlikely to be missing. Were there any Powerbook 190 computers sold without sound functionality or would it be possible to get audio by soldering in the correct audio jack?