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G-Net audio went to shit randomly

awbacon1

awbacon1

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Just overly distorted BGM music on Chaos Heat and Super Puzzle Bobble. Audio was fine, ten minutes into Chaos Heat...sounds like its clipping.

Thoughts? Not sure if one of the PSX custom audio chips on board ate shit or what. Randomly ZOOO has perfect audio but that may be using a diff chip / diff function.

Stumped on this one
 
astro_zombie138 said:
Maybe the caps in the audio circuit?
Click to expand...
SFX are fine...its just BGM audio. If you go into the test menu and select SFX playback...nice and clear. BGM music...sounds distorted AF and almost like its clipping but its clearly not

but thats the oddity...only SOME audio is screwed. Some is fine
 
awbacon1 said:
SFX are fine...its just BGM audio. If you go into the test menu and select SFX playback...nice and clear. BGM music...sounds distorted AF and almost like its clipping but its clearly not

but thats the oddity...only SOME audio is screwed. Some is fine
Click to expand...
That is super weird. Did you try pushing on the customs? Maybe you get lucky and it's a cold joint.
 
astro_zombie138 said:
That is super weird. Did you try pushing on the customs? Maybe you get lucky and it's a cold joint.
Click to expand...
no. Thats next steps. I just wanted to see if anyone here ever encountered it before I went fault finding. If its a cold custom I can reflow. If its a dead custom I can replace that board with a spare if I can find one
 
ShootTheCore said:
The Ensoniq music chip is voltage sensitive on these boards. Make sure the 5V rail is getting 5.0V on the JAMMA edge. If so, try raising or lowering it a bit and see if it makes any difference. @Tailsnic Retroworks adjusted the on-board pot for voltage on that chip with his recently and did a write up:

https://www.arcade-projects.com/threads/kaiser-knuckle-eeprom-location.20052/post-403176
https://www.arcade-projects.com/threads/taito-f3-ensoniq-correct-voltage-calibration.28847/
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Unless I missed it on the board GNET is a ZOOM and Ti combo deal on the audio side with a Panasonic sound CPU
 
My mistake - I had it in my head that you were running a Taito F3 for some reason. :P

With G-Net, all of the Sony PS1 based boards are notorious for various audio issues due to aging SMD caps. Definitely start with replacing those - especially since the behavior changes over time.
 
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