Each IDC plug on the receiver card corresponds to a row of panels on the LED wall.

J1 goes to the top row, J2 to the second row, J3 to the third row, etc. Again, make sure the connector is oriented correctly with the red wire on the R1 side and on the top side of the RGB panel as shown.

Stack the IDC ribbons on top of each other and wrap it with velcro.

Place a small piece of adhesive velcro onto the extrusion to keep the ribbon cables as close to the back as possible.