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Author Topic: Neo Geo AES sound issue  (Read 4811 times)
ArtificialEnemy
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« on: October 03, 2013, 03:51:25 AM »
Hi recently bought a NEO GEO AES but it has a sound issue. BGM and sound effects work perfectly. But whenever voice is played I hear popping and cracking and the voice is inaudible. This happens on all games i have tried (6 in total). I have taken the cover off of the Neo Geo AES and looked at the main board but cannot see anything visually wrong.  What are my possible next steps. I would even be fine sending it to someone for repair if anybody knows of a repairman.
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channelmaniac
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« Reply #1 on: October 03, 2013, 01:55:22 PM »
FM sounds are working but sound samples are not?

Check the traces between the YM2610 and the slots. You seem to have a problem between the sound ROM(s) on the cart and the YM2610, or a bad YM2610.
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ArtificialEnemy
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« Reply #2 on: October 03, 2013, 02:09:52 PM »
Not sure about the samples vs fm sounds but during league bowling when the character talks and says oh my gosh all I hear is popping cracking noises. I hear the ball sfx and bgm. I will try and work on the board in the next few days. If I have a bad trace I might be able to repair it but if the chip is bad I'm not sure I will be able to fix that. I will let you know what I find. Thanks for the help.

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rickhunter
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« Reply #3 on: October 03, 2013, 02:22:25 PM »
fm sounds are typicaly melodies and "synthesizer" type sounds.  Samples are recordings, like voices and the ball hitting the pins.
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ArtificialEnemy
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« Reply #4 on: October 03, 2013, 02:32:02 PM »
So I actually hear the ball hitting the pins too. But I will check the traces tonight. And would I check the slot connector to the trace nearest to the ym chip. Not having the board in front of me I can't remember where the traces start from the cartridge slot. Are the traces underneath the cartridge slot or next to the slot.
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rickhunter
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« Reply #5 on: October 03, 2013, 03:43:13 PM »
In the earlier games like those, the ball hitting the pins was synthesized and not an actual recording.  Voices, can be synthesized, but they sound weird.  I agree with channelmaniac's theory that there's something wrong with the DAC circuitry or path.
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ArtificialEnemy
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« Reply #6 on: October 04, 2013, 01:21:15 AM »
Ok so I tried to test the traces but I don't really know what I'm doing. Anybody know of somebody that fixes Neo Geo Aes systems. I'm willing to send it in for repair. I don't want to mess the board up and kill my neo geo.
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channelmaniac
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« Reply #7 on: October 04, 2013, 01:27:50 AM »
I can, but I'm backed up on work and have a waiting list that is a few months deep.

Raymond
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ArtificialEnemy
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« Reply #8 on: October 04, 2013, 01:37:41 AM »
Well could I get put on that waiting list. I would appreciate it very much.
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