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Need some serious help with MK2 sound

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Love5508:

I just got a Mortal Kombat 2 jamma board complete with the sound board and all the wiring.  Its revision 3.1 and looks like new.  I installed it into my MK4 cabinet and everything looks great EXCEPT....there is this constant annoying hum in the back ground.  Doesnt matter how loud or quite I make the volume, the static sounding hum is always the same loudness.  This does not happen with my MK4 board.  I checked all the power and I am getting the correct -5v to the sound board.  Its a hum that normally I would say is interference of some sort BUT when the game starts playing a demostration, the hum changes pitch depending on what is happening on screen...if the screen changes quickly from one frame then blacks out and goes to another, the hum goes with it.  I have heard a new power supply may fix this issue but I think I may be in denial.   :badmood:

Love5508:

I just read on these forums that the MK2 board uses p12, player 4 harness...hmm I have player 3 harness installed but I dont think that would cause this type of issue.  All my controls work fine.  Im stumped... ???

Malenko:

do you hear the hum when you put the MK2 in another cabinet? have you reseated the sound ROMs?

jcterzin:

if it changes with the video, could be your monitor. Are you saying that you used the same monitor when you tested the MK4 board?

Love5508:

Every thing tests fine when i swap my mk4 pcb into the cab.  No monitor or sound issues with mk4.  I only have this one cab.  This sucks.

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