Battle Garegga Bootleg (No Sound)

[d00mdrew]

Just got a BG bootleg but can’t get audio from the board. Graphics are fine, and the game recognizes all inputs. Here’s pics of the board:

Boot screen:

Worth noting, I can only get it to boot with graphics on my supergun. When I tried running it through my cab, I got clicking noises from the PSU and very faint garbled graphics on the monitor. Not sure where to start, but doing a quick search showed @Hatsune Mike has some experience with these?

Thanks!

 

[djsheep]

Post in thread 'Lei Shen Zhuan / Battle Garegga hack - Help / Advice needed'
https://www.arcade-projects.com/thr...egga-hack-help-advice-needed.8151/post-212586

 

[dexa]

You can swap speaker + and - to get audio working but note that you have a bootleg sound chip (KA51…). Your sound mix will be … different I still have to try if exact 5.00v really fixes the audio mix.

I guess I got a pcb from the same batch last week and I struggled with the same problems.

 

[d00mdrew]

Browsing through the OG thread now…thanks!

 

[Neodogg]

I tried reseating all the socketed chips and reflowed the volume pot…seems to have audio now…not sure what the exact culprit was…definitely has the hum. Might have to order some caps…

 

[Neodogg]

So I replace the C5 cap and didn’t notice any change in the hum/buzz.

It’s weird if I play the board in my cabs the sound of there but if I fire it up with my supergun, the sound is gone. Guess I stick with it in the cabs.

 

[8bitforlife]

Not to necro this thread but in curious what correct amp would be for this boot?

 

[Hammy]

Bootlegs will use random amps depending where it was made and what they can get hold of.

KA51 is just a copy of the 2151, it should be decent but i think those clone YM chips are a little bit quieter than the originals.

 

[8bitforlife]

Found out there's a dip switch that turns off oki sounds.

 

[dexa]

Found out there's a dip switch that turns off oki sounds.

which dip switch? I am still missing sound effects .. perhaps that helps me too