mk2 sound issue

musicmanhs

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Belfair, Washington
I need help, my board works fine all roms pass and sound board does its one tone and functions. the problem is it has a whining sound in it on startup. (A wee ooo wee ooo sound) I converted a missile command cabinet to jamma and thought the board was screwed up, I ended up testing my known good nba jam TE in it. I have the same sound problem. Any help or input would be appreciated.
 
can you take a pic of the inside of the cab. I would think this is a -5v problem.
 
if it's like an agonizing static buzzing sound, it's because you're not getting -5V to the board. :)

it's the most horrifying sound I've probably ever heard in my life.
 
are you running the original power supply from the Missle Command? o_O

if you dropped a switcher in, that's kinda scary if it doesn't have -5..
 
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