Pacman Bootleg Sound problem

[Equites]

Dudes

I've got this Pacman two layer bootleg PCB which runs on Midway pinout. It had issues to begin with but I have now got it running 100% except for the sound.

The PCB was originally designed to run via AC, but seems to have been hacked to run on DC.

I have been running it on my Vogatek Supergun which runs via a PC PSU.

I noticed that the original MB3721 Amp was getting very hot eventually, hot enough to burn. Also, the sound does not work, well sort of anyway. The sound is coming from the PC PSU?? This is where I am stumped.

I did replace the original MB3721 Amp with a new one, thinking it may solve the problem, but no, the sound is still coming from the PSU and not the speaker??

Anyone seen this before?

Pics;

http://imageshack.us/g/23/dsc01081yw.jpg/
Equites2011-10-26 02:46:24

 

[PaulSwan]

Check the power and output from the audio amp and if it has a series AC coupling electrolytic between the amp audio out and speaker out verify that it's not short. I've noted that some amps get hot if the audio out electrolytic is shorted out.

 

[Equites]

Thanks Paul, I will do just that and let you know what I find.