- Thread starter kikaso
- Start date
curious if you have checked the voltage on the 5V rail while the board is powered on? I would check the board side to verify its at/near 5V. The Metal Slug X picture seems to point to issues beyond just sound cutting out.
channelmaniac
Professional
Is the 12v dying off? That would cause no audio.
Ah good idea. I’ll fire up Metal Slug and wait for the sound to cut out then check the 12V
Raph_friend
Grand Master
But then it would be a PSU problem, since there is nothing in the way of the 12V line to the amplifier. Also, this problem would happen with all JAMMA boards, not just this specific one.
A buddy loaned me a MV1F one slot and the sound issues,
In the meantime, I ordered a new YM2610 to see if that solves the audio issues on the MV1FZ.
EDIT: both motherboards are having same audio issues and glitching on Metal Slug X. I’m ready to rule out cartridges and the motherboards as faulty unless I have awful luck? That leaves the arcade cabinet and PVM supergun setup. The voltages are 5V tested on two different multimeters. What’s happening?!
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I'm curious, what was the result of this test?
Forgot to post that update. Stays steady at 12.2V with sound and after sound cuts out.
Another update:
I played Metal Slug, Neo Turf Masters, and Metal Slug X all the way through to the end. Took me about 30-45 minutes per game—no issues whatsoever. After getting to the end, I let the game loop in attract mode and the sound stayed on. Further, Metal Slug X didn’t glitch out after more than 45 minutes of attract loop after beating the game.
It seems that the games lose audio (or glitch out In the case of Metal Slug X) if I turn them on and let them loop in attract mode for 20 minutes or more. If I insert a credit at any point while it still has audio, the game plays fine with no issues. If I insert a credit after audio is lost, I have to power cycle to get audio back.
I’m issuing a bounty; anyone who can help me solve this gets a free Fujiyama Buster / Shogun Warrior arcade board. The game works fine but I never got the kicks sorted out. I have a couple of harnesses but I never put the time into figuring it out. Free shipping to the US but if international, I’ll split the shipping costs with you.
Solving this mystery could mean I have no more audio issues and/or glitches or it could mean finding evidence that certain Neo Geo games losing audio if left in attract mode is a known and documented problem.
I played Metal Slug, Neo Turf Masters, and Metal Slug X all the way through to the end. Took me about 30-45 minutes per game—no issues whatsoever. After getting to the end, I let the game loop in attract mode and the sound stayed on. Further, Metal Slug X didn’t glitch out after more than 45 minutes of attract loop after beating the game.
It seems that the games lose audio (or glitch out In the case of Metal Slug X) if I turn them on and let them loop in attract mode for 20 minutes or more. If I insert a credit at any point while it still has audio, the game plays fine with no issues. If I insert a credit after audio is lost, I have to power cycle to get audio back.
I’m issuing a bounty; anyone who can help me solve this gets a free Fujiyama Buster / Shogun Warrior arcade board. The game works fine but I never got the kicks sorted out. I have a couple of harnesses but I never put the time into figuring it out. Free shipping to the US but if international, I’ll split the shipping costs with you.
Solving this mystery could mean I have no more audio issues and/or glitches or it could mean finding evidence that certain Neo Geo games losing audio if left in attract mode is a known and documented problem.
channelmaniac
Professional
Do you have a UniBIOS installed? UniBIOS 4.0 has been doing some weird shit on boards sent into my shop like a 4 slot with no audio on Samurai Shodown and no audio on slots 2 and 4 on another board. Leave the carts in the slots while lifting the top board up and changing the BIOS then plugging it back to the bottom board gives you audio back. Repeating with reinstalling the UniBIOS and audio goes out again. Crazy stuff. I downgraded one to a UniBIOS 3.3 and reset the backup RAM on the other.
I do have unibios 4.0 on both. I’ll put the original Japan bios in and do some testing tonight.
Swapped in the original Japanese BIOS and Metal Slug has been running for two hours with no audio issues. Seems like the UniBIOS was causing the audio issues. I’m testing Metal Slug X now since that game was also having issues, (graphical not audio) but I’m confident that it was UniBIOS 4.0 that was responsible for the errors.
@channelmaniac PM me your address; you’re the proud owner of a kusoge.
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Now that I’ve “fixed” the audio with channelmaniac’s help, I’ll go ahead and install your stereo board
