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nostos

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Joined
Dec 4, 2018
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Location
Italy
Hi,

I've got an audio issue with a Gauntlet pcb.
The symptom is that I've got no audio at all in left and right channels.
I run into audio test and no audio, speech, or any kind of sound can be heard in both channels. Just a huuum and a little frying sound.
According to self test audio section is good:


I've checked sound ram chips 6116 with neoloch inquisitor and they are both fine.
I've also replaced 6502 CPU and Yamaha YM2151, but nothing changed.
Otherwise the game is working fine... input controls too.
I don't have any Pokey to make further test, but I suspect the issue is elsewhere...

Any suggestions of what to investigate into?

Thank you
 
this board has no amplifier on it.
so did you check at the board or the speaker??
 
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