Audio problem with NeoGeo single slot

Gov

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I bought a single slot NEOGEO MVS about a month ago from a fellow KLOV'er and I also picked up a Metal Slug cart from them. I have a standard Jamma cab that is a Dynamo HS9A. I have used several other boards and a PC hooked up to the JAMMA harness with no problems. However with the MVS the bios screen sound is fine as well as the test screen tones. When a game boots though it is a loud garbled static over the game sounds and in place of some game sounds. I have made sure the Mono/Stereo switch is set to mono. I have also taken off the only removable chip on the board and re-seated it.

I have contacted the seller about the problem and we decided to wait until my 161 in 1 cart showed up and to test it to see if it was the Metal Slug cart or the MVS. It appears there is something wrong on the MVS board. I have contacted the seller and I am sure he is going to take care of things, but I thought I would post the video of the problem here to see if it might be an easy fix or if the audio amp or something is toast.

Sorry for the video being sideways, I was using my phone and I can never remember which way to hold it.

 
First off, good job making sure the sound is set to mono. I would take the cart apart and clean the edge connectors. Use a pink eraser and scrub them down. Then use isopropyl alcohol and a cutip to finish them off. Do not leave any eraser shavings in there. Good luck buddy.
 
Fair enough. Next, you move onto the mvs. Unhook it and take a peice of poster board and fold it over to make it more thick. Put some isopropyl alcohol on it and work in the slot a few times. I would also take a tooth brush and scrub it.
 
It looks like the original battery is still on there....remove it and wash the area right meow.
Hopefully nothing is damaged too bad yet.

THe MVS sounds like it needs new caps, pretty common problem on older boards.
 
I was told the battery had been replaced, but I don't know for sure. He said he has another board he can send me. I am going to try cleaning the contacts tonight just in case, but i am not hopeful.

Is a cap kit very expensive for these?
 
I was told the battery had been replaced, but I don't know for sure. He said he has another board he can send me. I am going to try cleaning the contacts tonight just in case, but i am not hopeful.

Is a cap kit very expensive for these?

There might be $2-3 worth of caps in the sound section.
 
Fair enough, is there any kind of guide out there for locating which ones to replace and where I can get the caps needed? Still new to a lot of this repair stuff so I don't have any kind of stock in repair parts. I can solder though ;)
 
http://www.arcadecomponents.com/catalog/item/5727916/5603363.htm

If you are a collector with game consoles and other things that are over 15 years old
it might be a good idea to order from Mouser and stock up on some common used caps.

4.7, 10, 22, 47, 100, 220, 330, 470 and a few 1000 and 2200uF capacitors.
25V will do most jobs and few at 50V come in handy too.
 
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Thanks for the link. I don't have any old consoles as they don't really appeal to me, but I am starting to get more arcade stuff as I have 3 cabs now. :) I will look into ordering up some stuff to have on hand.

Thanks again.
 
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