|I assume anything related to the audio has been enabled in cmos/bios setup?|
If it is the southbridge chip, or a separate audio chip for that matter, I doubt if it's practical to repair it. It'd probably be cheaper to replace the motherboard, but with a laptop that's going to be hard to do by yourself unless you have previous experience.
"It was far easier for you as civilized men to behave like barbarians
than it was for them as barbarians to behave like civilized men."