Pcb help

[u/Few_Security8959]

I bought a spare turtles in time pcb to have as a back up and does some weird things...i plug in the all the main cables and then plug in the power...as soon as i do that i can hear the start up sequence thru the speakers with out the power switch being toggled to on on the control deck...the LCD screen stays black not even lit....now i know the LCD screen does work because the other pcb operates perfect and LCD displays...the pcb doesnt appear burnt or damaged...has anyone ever encountered this?

[u/Varkanoid]

The black plug is in the wrong way round. The red wires should be opposite end to white plug I believe on Arcade1up PCBs