Neo-Geo MVH-MV4 - Sound Issues

zed7

n00b
Joined
May 9, 2020
Posts
42
Hello, here's the quick rundown with my 4 slots issues.

The cause: the ground wire for the monitor fell off, and shorted at least 3 buffer chips. 2 bad LS244 chips were found via temperature, which restored partial sound, and stopped the system from randomly crashing.

I have built a SMKDAN diagnostic cartridge and received the error(s):
Z80 Reported Error Code: 14
M1 BANK ERROR (16K)

Quick things: The cartridge slots are clean and are NOT the issue.
It is NOT the Z80 or YM2610.

Sound is inconsistent. No sound in Last Blade or Metal Slug X, but a hum SFX in Ragnagard attract, and distorted noisy audio for Ninja Commando with game intro (the guy talking)
Bust-A-Move has almost ALL noises in-tact, but missing attract and NEO-GEO jingle.

Any schematics of chips in between the M1 and Z80 is a fantastic help. Thank you again!
 
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