warning E19: communication between display system and main control board is abnormal
a) This failure means the “communication abnormality between display system and main control board”. Use it again after restarting the instrument. If this failure occurs again, find out the problem. If no problem is discovered, it will be caused by interference. At this time, continue to use it by ignoring this problem.
b) First, confirm whether the indicator lamp D32 of main control board of main console flickers; otherwise, it should be the failure of main control board. Replace the main control board of main console or try updating the firmware.
c) Try updating the P4 wiring harness of main control board of main console.
d) Switch the communication interface TTL of “ARM development board” to RS232 electric level through the “Android LCD communication board”. Try replacing the two components in display system.