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Author Topic: IGT 044 with no sound  (Read 790 times)

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Offline hotlsot

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IGT 044 with no sound
« on: July 04, 2022, 09:08:05 AM »
I have an IGT 044 with no sound. Swapped flash boards and 044 boards and it follows this board. I don't have a schematic for this board so I am flying blind. Take a look at the pic of the upper right of the board and you'll notice that many of the components have been removed. I have seen a few other boards with these components removed. Is this the sound section of the board? Would anyone have any interest in repairing this board?
thanks

Offline Tilt

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Re: IGT 044 with no sound
« Reply #1 on: July 04, 2022, 01:41:00 PM »
There's a schematic in the file section.  The removed components are for an auxiliary audio source, so it shouldn't affect game audio.  Not sure why someone removed them, maybe they were causing a problem?  Did the audio work before?  Not sure who can repair them these days.

Offline Retro tech repair

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Re: IGT 044 with no sound
« Reply #2 on: July 04, 2022, 08:10:19 PM »
If this is the board i just looked at yes I removed the auxiliary input components just incase they were the problem they were not. I replaced all the caps that usually cause no sound and checked all the supply voltages they were all good. I tried injecting sound into c3 and c4 after the dac and i did get sound out of the amps. I probed the debug headers for u18 and u40 and got nothing. That was the point i gave up.

Offline 474lsa

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Re: IGT 044 with no sound
« Reply #3 on: July 04, 2022, 08:19:20 PM »
Could you please post which caps are usually the cause of loss of sound on these boards please?

Offline Tilt

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Re: IGT 044 with no sound
« Reply #4 on: July 04, 2022, 10:22:45 PM »
If this is the board i just looked at yes I removed the auxiliary input components just incase they were the problem they were not. I replaced all the caps that usually cause no sound and checked all the supply voltages they were all good. I tried injecting sound into c3 and c4 after the dac and i did get sound out of the amps. I probed the debug headers for u18 and u40 and got nothing. That was the point i gave up.

That makes sense.  The AUX audio caps on the MML2 boards can cause a lot of audio problems with the 3902 MPU board. 

Did you check the +5V and +12V audio power?  If it is missing you'd have no audio out of the pre-amp (U2) or the audio amps (U9/U10). 

Offline hotlsot

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Re: IGT 044 with no sound
« Reply #5 on: July 05, 2022, 07:30:34 AM »
If this is the board i just looked at yes I removed the auxiliary input components just incase they were the problem they were not. I replaced all the caps that usually cause no sound and checked all the supply voltages they were all good. I tried injecting sound into c3 and c4 after the dac and i did get sound out of the amps. I probed the debug headers for u18 and u40 and got nothing. That was the point i gave up.

Yes, this is the same board. these 044 are so damn hard to come by and expensive I was hoping to maybe take a run at it myself, but it sounds like you covered everything. I can't think of anywhere I'd go that you didn't. It's off to the parts pile. Thanks for taking a run at it.

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Re: IGT 044 with no sound
« Reply #6 on: July 05, 2022, 07:45:07 AM »
If this is the board i just looked at yes I removed the auxiliary input components just incase they were the problem they were not. I replaced all the caps that usually cause no sound and checked all the supply voltages they were all good. I tried injecting sound into c3 and c4 after the dac and i did get sound out of the amps. I probed the debug headers for u18 and u40 and got nothing. That was the point i gave up.

Yes, this is the same board. these 044 are so damn hard to come by and expensive I was hoping to maybe take a run at it myself, but it sounds like you covered everything. I can't think of anywhere I'd go that you didn't. It's off to the parts pile. Thanks for taking a run at it.

I totally understand and encourage it. I do not know everything so its always a good idea to get a second opinion.

 

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