Received from USA this Pac-Mania ROM board (Namco System 1 hardware) for repair :
According to the owner board played fine but mute, this was confirmed once powered it up.Using my audio probe I could hear sound on the input (pin 2) of the two LA4460 amplifiers but nothing on outputs:
At closer inspection one of them was literally blown up:
So I proceeded to remove both:
and installed two new spares and some thermal compound on heatsink:
Sound restored and board 100% fixed.End of job.
After converting this board to Splatterhouse I found that voices and other sound FXs were missing:
I quickly pinpointed the fault in a bad TL084 OP-AMP, replacing it cured the issue: