MK2 and UMK3 problems

[diosleon]

Hello. I recently picked up a MK2 and UMK3 boards from different sellers.

MK2 has no sound. I get the “boop” at the start and the soundboard is on but I still get not sound. The board was tested before shipping

UMK3 has no sound as well and the graphics are glitched.

Anyone knows what could be wrong?

 

[Estenze]

Is your cabinet wired up for -5v? MK pcbs need -5v for sound.

 

[santa978]

I had the same problem
My cab didn't have -5v

 

[diosleon]

Is your cabinet wired up for -5v? MK pcbs need -5v for sound.

Turns out. I forgot to plug in one of the cables


UMK3 might be a dirty board causing everything