How do I fix error code E CO on a LG refrigerators?

1. undefined: Check loose connections at display PCB connectors and hinge wiring connections. 2. undefined: Reconnect any loose connectors. 3. undefined: Measure voltage at CON101 18th Pin ~ 16th Pin. Should be 12V. If not 12V: check hinge connection (loose) or replace Main PCB. 4. undefined: Measure voltage at CON101 10th Pin ~ 16th Pin. Should be 5V. If not 5V: check hinge connection or replace Main PCB. 5. undefined: Measure voltage at CON101 14th Pin ~ 16th Pin. Should be not 0 or 5V. If 0 or 5V: replace Display PCB. 6. undefined: Measure voltage at CON101 12th Pin ~ 16th Pin. Should be not 0 or 5V. If 0 or 5V: replace Main PCB. 7. undefined: Measure voltage at CON5 4th Pin ~ 3rd Pin. Should be not 0 or 5V. If 0 or 5V: replace Display PCB. 8. undefined: Measure voltage at CON5 5th Pin ~ 3rd Pin. Should be not 0 or 5V. If 0 or 5V: replace Main PCB. 9. undefined: If all pass: explain to customer.

LG Refrigerators

Error Code E CO

Communication error between main MICOM and display MICOM

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Check loose connections at display PCB connectors and hinge wiring connections.
2
Reconnect any loose connectors.
3
Measure voltage at CON101 18th Pin ~ 16th Pin. Should be 12V. If not 12V: check hinge connection (loose) or replace Main PCB.
4
Measure voltage at CON101 10th Pin ~ 16th Pin. Should be 5V. If not 5V: check hinge connection or replace Main PCB.
5
Measure voltage at CON101 14th Pin ~ 16th Pin. Should be not 0 or 5V. If 0 or 5V: replace Display PCB.
6
Measure voltage at CON101 12th Pin ~ 16th Pin. Should be not 0 or 5V. If 0 or 5V: replace Main PCB.
7
Measure voltage at CON5 4th Pin ~ 3rd Pin. Should be not 0 or 5V. If 0 or 5V: replace Display PCB.
8
Measure voltage at CON5 5th Pin ~ 3rd Pin. Should be not 0 or 5V. If 0 or 5V: replace Main PCB.
9
If all pass: explain to customer.