super pacman pcb help-no sound

arcadejunke9

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hi guys, i have a super pacman pcb that has no sound.. every so often i will hear popping out of the speaker from the game when super pac is eating the keys, fruits and the ghosts and so on in attract mode... i have went as far as to do the following...


1.replaced the caps in the audio section

2. replaced the audio amp with a nos mb8370

3. swapped the 4066 out with another one robbed off another board..

i still cant figure out why im not getting any sounds except popping... maybe someone could lead me in the right direction... help?!
 
Are the legs on 3N crusty/tarnished? If so clean and try again.

Do you have a logic probe? If so, check the outputs of 3M and 4M...

If not, replace 4M and try again.
 
Oh, also make sure none of the speaker wires are grounded. The amp is bridged.
 
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