MV1FS sound problem

Dexx1981

Dexx1981

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i have this MV1FS which worked fine yesterday but now i have this weird sound issue :unsure:
every game is different, for example:

Thrash Rally: no bios tune, Popping sound and nothing else
Andro Dunos: no bios tune, music works sometimes
Metal Slug: no bios tune and no sound at all
Pulstar: works fine...

what coud be the problem? battery is already removed the damage is not bad but ehm yeah.. o_O help??
 
Neo Alec

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Clean the cart slots and clear the backup memory.
 
Neo Alec

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It could still be just dirty slots/cart connectors. Also, your diag cart could be wrong.

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Tw3ek

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When you say the battery damage is "not bad", have you confirmed that everything in that area is cleaned up and still connected?
 
Dexx1981

Dexx1981

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Tw3ek said:
When you say the battery damage is "not bad", have you confirmed that everything in that area is cleaned up and still connected?
Click to expand...
the battery was already gone when i got it.. i need to check for bad traces now.
 
Dexx1981

Dexx1981

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desoldered the Z80 and tested it with the chiptester V2, PASSED even the BURN-IN test is ok :unsure: removed the ROM chip next to it.. PCB looks clean on both chips.. i'll do the YM2610 later.
 
Neo Alec

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No bad traces around the battery/backup ram area?
 
Dexx1981

Dexx1981

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Neo Alec said:
No bad traces around the battery/backup ram area?
Click to expand...
does this answer your question 😁 bonus photo included, it was filthy... if there is something with the C1 or D0 chips.. i do have spares that i forgot i had them :LOL: image2.jpeg
image1.jpeg
 
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Dr. Jigglin

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This might be a bit of a guess but I've had a trace or two break from just handling the motherboard, maybe it was me or maybe it was broken before hand it's a mystery but I'd start by tracing from the cart slot. It might be a nightmare but if you're intent on fixing this it's worth the time.
 
Neo Alec

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Dexx1981 said:
does this answer your question 😁 bonus photo included, it was filthy... if there is something with the C1 or D0 chips.. i do have spares that i forgot i had them :LOL: View attachment 95688
View attachment 95687
Click to expand...
No, it doesn't. It looks good, but you need to do the work of beeping them all out if you haven't already. Did you repair those ones in the immediate area? I see exposed copper already.
 
Dexx1981

Dexx1981

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Neo Alec said:
No, it doesn't. It looks good, but you need to do the work of beeping them all out if you haven't already. Did you repair those ones in the immediate area? I see exposed copper already.
Click to expand...
yeah, that's my fault.. i'm gonna BEEP some more on the traces :LOL:
 
Dexx1981

Dexx1981

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oh crap, corrosion detected in the RTC area.... but that isn't the issue of this thread, cleaned it anyway :giggle:
 
Dexx1981

Dexx1981

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tested the 6116 static ram, test failed... but after a firmware update on the chiptester V2 it passes the test :unsure: oh well, the only thing that could be bad is the YM2610.
 
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Dexx1981

Dexx1981

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ok! update about the sound issue, it's still there o_O i soldered sockets on the board so there has to be a bad trace under one of the custom chips... puzzle de pon is really off with the music, my ears... what to do next??? i checked all the connections from de chips to the cartridge connector...
 
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