All the LEDs are controlled by the AR2035X LED controller board located behind the score display of each lane. When the games are successfully linked the LEDs across all of the lanes will flash the same color sequence. The red led on location D4 should have a constant rapid flash, if the led is slowly flashing it is an indication that the boards are not communicating.
All of the phone jacks on the controller board are on a parallel circuit. If you suspect you have a bad jack you can move it to another to verify.
If you have no LED lighting at all check the power on connector J7, it is the input power. Take your red probe and place it on either pins 1 or 2. Now take your black probe and put it on either pins 4 or 5. Your meter should read +12 volts of DC power. If you are reading 0vdc then check the 5 amp fuse in the harness between the power supply and the LED controller board
J1 and J2 connectors are the outputs to the LEDS on the game/marquee. Pins 1 and 5 on J1 and J2 have +12 volts of DC always present. The grounds for the LED output are switched on and off by transistors. So you need to place your black probe on J7, pin 4 or 5 to read the voltage. Both J1 and J2 connectors have the same pin outs and are interchangeable. J2 controls the side glass led strips normally and J1 controls the lane led strips normally.
The led strips are driven by the IRL540N transistors at locations Q1- Q6. Q1 controls the red LEDs on pin 2 of both J1 and J2. Q2 controls the green LEDs on pin 3 of both J1 and J2. Q3 controls the blue LEDs on pin 4 of both J1 and J2. Q4 controls the red LEDs on pin 7 of both J1 and J2. Q5 controls the green LEDs on pin 8 of both J1 and J2. Q6 controls the blue LEDs on pin 9 of both J1 and J2. You can short the color drive lines to ground and the corresponding color will light.