AES no sound YM2610

[everten]

Trying to fix an AES with no sound for a friend. Seeing the mangled solder job, it looks like someone tried to replace the 2610 chip. Pin 4 trace is broken and fixed with a jumper wire, but the jumper wire is not connected on the other end. It's hard to follow the trace as is goes under the slot. Does anyone know where I should jump pin 4 on the 2610 to?

 

[bustedstr8]

Pin4 is D2 on the 2610, so I would think a jumper to D2 on the Z80 would work fine.

 

[Xian Xi]

WTF?!?

 

[HeavyMachineGoob]

I think it's time to send that Neo Geo to a professional.

 

[everten]

WTF?!?

Tell me about it...

 

[everten]

D2 on the Z80 is pin 12, correct?

 

[Xian Xi]

D2 on the Z80 is pin 12, correct?

Yup.

 

[mjs256]

I think if I were working on that board the first thing I would do is remove that YM2610 and closely inspect the board underneath for damage, solder bridges, etc... since the pins look like they are just sitting on top of the board it probably will not be hard to remove. Then suck the solder out of the holes and install a socket before putting the YM2610 back.

Anyway, if you give me the board revision number I may be able to tell you where that pin4 trace goes.

 

[everten]

I think if I were working on that board the first thing I would do is remove that YM2610 and closely inspect the board underneath for damage, solder bridges, etc... since the pins look like they are just sitting on top of the board it probably will not be hard to remove. Then suck the solder out of the holes and install a socket before putting the YM2610 back.

Anyway, if you give me the board revision number I may be able to tell you where that pin4 trace goes.

Not seeing a revision number, just says NEO-AES.

 

[mjs256]

Not seeing a revision number, just says NEO-AES.

Thanks for the picture - I checked and I have one that looks exactly like that. I checked it with my multimeter and confirmed that pin4 of the YM2610 does indeed connect to pin12 of the Z80.

 

[everten]

Thanks for the picture - I checked and I have one that looks exactly like that. I checked it with my multimeter and confirmed that pin4 of the YM2610 does indeed connect to pin12 of the Z80.

Thanks!

 

[mjs256]

Thanks!

No problem Let me know if you need any logic states off mine for comparison with yours (though you should be aware that mine has a weird audio "stuttering" problem that I have not yet gotten to the bottom of - so it is not perfect either).

 

[everten]

WTF?!?

It gets better, check out the other side of pins:

 

[Kid Panda]

It gets better, check out the other side of pins:

 

[mikejmoffitt]

Looks like someone did this job and didn't have a proper desoldering iron / station, and couldn't empty all the holes, so he just semi-surface mounted it.

 

[everten]

I jumped pin 4 on YM2610 to pin 12 on the Z80, still not working. When the system boots I hear 2 or 3 quick static tones and then silence, same with the headphone jack. Is it worth a shot ripping the YM2610 out and replacing? It looks like you can buy that chip for about $5 on eBay.

 

[bustedstr8]

Ya...abort that monstrosity and clean up the area. Check for shorts, lifted pads, ripped traces, etc. before installing the new IC.

 

[Xian Xi]

Make sure to put a socket in.

 

[everten]

Does anyone have a YM2610 chip they could sell or know a US supplier?

 

[aha2940]

Does anyone have a YM2610 chip they could sell or know a US supplier?

eBay has them for $3 to $6, shipped from China.

 

[mjs256]

Does anyone have a YM2610 chip they could sell or know a US supplier?

My recommendation would be to remove the YM2610 first, then inspect for issues underneath it, then install a socket, then put the YM2610 back in the socket and test. That prior "repair" job is so ugly it may well be a bad solder joint on one of the pins - the YM2610 could be okay but just not connected properly to the board.

If you still need a new YM2610 then I can sell you one. PM me if you are interested.

 

[everten]

I cleaned up the mess and installed a socket w/ new YM2610. I had to jumper pin 4 to pin 12 on the Z80 again. Still no sound. Any ideas?

 

[Hairy Otter]

Nice cleaning job!
Now you have to check for activity on all the pins of the Z80 and YM2610 with a logic probe. Take mjs256's offer to give a list of logic states for comparison. Maybe he can share it with the group?

Maybe it compares to the YM2610 on an MVS board (logic state only). This info can be found here: Botem of this reply:
Link. Thanks mjs256

 

[mikejmoffitt]

Have you tried listening for the PSG audio directly from the YM2610? That'll tell you if it's alive at all. That, or the serial data out, it'll sound hissy but you may hear traces of the game audio in it.

 

[Hairy Otter]

Have you tried listening for the PSG audio directly from the YM2610? That'll tell you if it's alive at all. That, or the serial data out, it'll sound hissy but you may hear traces of the game audio in it.

Can you please explain how to do this. What do we need, to listen to the audio?