how to save way to split CGA video for doble display monitor

[Acidrock]

i have 2 cabinet i need to link cabinet for versus
i use link cable from pcb board  wire link


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i connect and power on my pcb have fail can't open it again T_T  i think video amp from pcb not enough
i need to know how to make cga video from pcb to Split to 2 signal  for doble monitor and  save pcb game  board

my chasis is WEI-YA 829HR CGA

my pic pcb broken now i send to fix in hongkong Saddddddddddddddddddddd


Thanks: ฝากรูป

thank you for any answer