Cause

Od is displayed when there has been no signal between WiFi and Display PCB.

Solution

Check to see if the unit shows up in the wifi access points on your phone when activating Wifi from the display. If so, the Wifi PCB is functioning but having a communication problem to the Display PCB. In this case check wiring connections at Display PCB and Wifi PCB.

(Please see your specific units Schematic for correct wire colors and pin numbers.)