House of the Dead PCB repair suggestions

might be cheaper to find another PCB as repair is going to cost $100 and above, is it HOTD or HOTD2 ? what is the problem with it?
 
HOTD 1.....someone wired in a Jamma connector and when I hook it up I get the fan and LEDs but no video or sound.
 
does the sound go thru an amp? also the video is routed thru the gun pcb I believe, was this working and just failed?
 
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