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you can check the horrible sound glitch on my twitter account :giggle: neogeo glitch...

i meant information about how to tackle that issue :giggle: and YEP, that chip was the problem.

PROBLEM FOUND and FIXED!! the issue was this chip. i couldn't find much info on the web so i tried this, glad i had a spare chip in stock :sneaky:

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...

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.

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

yeah, that's my fault.. i'm gonna BEEP some more on the traces :LOL:

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:

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.

the battery was already gone when i got it.. i need to check for bad traces now.

hmm, it could be the Z80 then :unsure:

grabbed my diagbios and cart.. now i'm getting somewhere :sneaky:

no luck, this is a mobo problem :cautious:

backup ram is cleared and i'll clean the cart slot again.

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...

ah yes, i ended up giving the board to a friend, maybe he can fix it :geek: i got a free MV4FS back which does have a VG2430 battery, replaced that one with a Lir2477, i really hope you get yours working again.

right, got it (y) thanks.

interesting, i use this kind of NiMH battery for my spare 1 slot MV1FS board... on 2 wires, thanks for the link :D still thinking if this doesn't give any trouble.. the VG2430 is 3V and this one is 3.6V :unsure: sorry for the questions, i just want to be sure.

lol, it really needs a new battery.. it can't even hold the time for a whole day :LOL:

hehe, it is for a MV1B or MV1C, a MV4FS needs a very long lasting battery so i don't have to unscrew 12 screws when the battery is dead :LOL: i'll go for that big ass battery then! also, i don't know how long it will work on this board, if yours holds a charge for 5 years now, imagine what a...