Well if the board works and the speakers work in another machine, I would say it's got to be a wiring issue 1st, then bad sound ROM 2nd. I would take all the speakers from TAF and put them in FT. If they work, then I would test continuity on all the speaker wiring and grounds in TAF. If that checks out I would get a new sound ROM. After that, I don't know, possibly mpu? Not sure that helps, but I checked mine. I have rev p-2 ,but mine is original.