Neo Geo AES - No sound

So I have a neo geo AES, and no sound at all from any game I play. Everything else works fine. Anyone have an idea on how to fix this, or what the issue might be? Is this common?

 

I'm not an expert but sometimes a dead capacitor leads to extremely low/no sound. Have you tried cranking the volume up as far as your TV or Stereo goes to see if you can faintly hear audio from the game? If you can faintly hear it, then there is likely a capacitor that needs replacing.

Others may have some ideas what it could be.

 

Headphone jack work? No lines on the screen, correct?

 

Yeah, first you should try the headphone jack.

Sound from A/V out, none from headphone = damage in headphone amp circuit
Sound from headphone, none from A/V out = damage in discrete amp or RGB encoder circuit
Crackly sound = bad trace between V ROM and 2610 (or could be the cart)
Sound from neither = most likely damage in digital sound circuit (Z80, 2610, M ROM connection, 6116, NEO-B*, NEO-C*, discretes) but it could also be the analog filter section or the audio loop

 

Could also be bad trace along the chip enable pin on the sound chip, as well, correct?

Funny, I just googled "chip enable pin" Neo Geo AES and this came up.


channelmaniac:
Model: AES
Symptom: No sound

This was a bear to track down. Cleaned corrosion off the board. Cleaned the right end pins on each slot and socketed 3 chips to check the traces under them. Found a bad trace between E9 pin 6 (74LS11) and CN4 (front slot) pin 47A and Q3 pin 9 (74LS04). This trace was the Chip Enable pin on the sound program ROM. Patched the trace and tested the board.

 

That's the M ROM, part of the digital circuit. There isn't really any trace that is more likely to be damaged on an AES than any other. I would:

-first probe for audio right after the DAC to verify that the digital portion is down
-move to a logic probe and note each pin in the digital portion of the audio circuit which is not pulsing
-discard the pins which are power or /reset
-check the remaining pins for continuity (multimeter) to their "nets" (bus line), you can try to determine their connection visually (could require desoldering...) or with a lot of computer engineering experience you can usually deduce their connections by adjacent signals

 

I am interested to know. I wish the OP would get back to us.