CPS2 A board sound issue

[Neo'nate]

I appreciate a lot has already been documented about CPS2 sound settings (being saved) depends on a functioning chip/part, but before I start with that route is there honestly anything else I can possibly try -

I have one A board that resets to full volume (39) after almost every turn off and on again.
I have one A board that the volume up switch does not seem to work at all, so now the sounds locked into zero

I have tried the 'hold down the volume buttons' for 5 seconds/ splash screen to hard reset, but that's not working. Are there any other simple tricks to try before I start tinkering with swapping components and following traces etc?

Thanks

[nem]

I have one A board that resets to full volume (39) after almost every turn off and on again.

There's a supercap that may or may not hold settings.

https://www.arcade-projects.com/threads ... lume.4463/

I have one A board that the volume up switch does not seem to work at all, so now the sounds locked into zero

Volume up and down can also be found on the kick harness connector. You could repin a connector and see if you can get volume increased that way.

https://wiki.arcadeotaku.com/w/Kick_Harness

[Neo'nate]

Thanks for those links, awesome stuff nem!