What are some general tests that I could conduct to see what the problem is with sound in a machine? I have a Double Dragon and Neo Geo 2-slot MVS. Both work, but both have no sound. The Double Dragon has a loud buzzing sound whose pitch changes when something in the game changes, which tells me that at the very least, it is getting a signal from the PCB. In the Neo Geo I used to be able to hear some sound coming out of one of the speakers, extremely faint, but it was there. Now I don't even get that. So what do you think?
