Ki2 board no sound ? Help

[Killerinstinct69]

Hello All

I have a ki2 board off ebay plays n such but no
Sound when sound is plugged in buzzn noise..
Seller replaced the ram chips he gave me some capacitors to replace the one on board and i fire it up and still no sound? After i installed a new one..

Thanks

 

[Killerinstinct69]

Video

View: https://youtube.com/shorts/Bmkv5s_zIsg?feature=share

 

[100Proof]

You have a +5V line on your supergun? KI will run without sound if you try to run it on a cab/supergun with no +5V line.

 

[BuddyC]

@100Proof I think you mean -5v.
To run most Midway PCB’s with sound, you need a PSU with a -5V rail

 

[100Proof]

You are correct. It got it backwards.