Problem: Double Dragon pcb no music

[hd]

Hi!

got a like new Double Dragon. pcb has no music but low volume sound. some kind of low frequency background noise is present. seems to be the music but distorted.
any hints ?
replace caps in the audio path ?

thanx

[system11]

If the sound effects work, it's very likely an op-amp has failed, or maybe the DAC. If the sound effects are similarly affected it could be the main amp caps or the amp itself. Really needs someone with an oscilloscope to diagnose properly.

I can't remember if this one needs -5v, I'm assuming your cab has that though.

[hd]

hehe i guess it is just missing -5V

Thanx for the hint

[cools]

I can't remember if this one needs -5v

It does

[slap_fight]

if no -5 then no sound at all.