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

1. undefined: Check all loose connections on CON101 and CON5. 2. undefined: Measure voltage at CON101 pins 18 to 16. Expected: 12V. If not 12V: check hinge connection (loose wiring through hinge). If hinge is OK: replace Main PCB. 3. undefined: Measure voltage at CON101 pins 10 to 16. Expected: 5V. If not 5V: check hinge connection. If hinge is OK: replace Main PCB. 4. undefined: Measure voltage at CON101 pins 14 to 16. Expected: not 0V or 5V (variable signal). If 0V or 5V: replace Display PCB. 5. undefined: Measure voltage at CON101 pins 12 to 16. Expected: not 0V or 5V (variable signal). If 0V or 5V: replace Main PCB. 6. undefined: Measure voltage at CON5 pins 4 to 3. Expected: not 0V or 5V. If 0V or 5V: replace Display PCB. 7. undefined: Measure voltage at CON5 pins 5 to 3. Expected: not 0V or 5V. If 0V or 5V: replace Main PCB. 8. undefined: If all voltages are within spec: explain situation 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 all loose connections on CON101 and CON5.
2
Measure voltage at CON101 pins 18 to 16. Expected: 12V. If not 12V: check hinge connection (loose wiring through hinge). If hinge is OK: replace Main PCB.
3
Measure voltage at CON101 pins 10 to 16. Expected: 5V. If not 5V: check hinge connection. If hinge is OK: replace Main PCB.
4
Measure voltage at CON101 pins 14 to 16. Expected: not 0V or 5V (variable signal). If 0V or 5V: replace Display PCB.
5
Measure voltage at CON101 pins 12 to 16. Expected: not 0V or 5V (variable signal). If 0V or 5V: replace Main PCB.
6
Measure voltage at CON5 pins 4 to 3. Expected: not 0V or 5V. If 0V or 5V: replace Display PCB.
7
Measure voltage at CON5 pins 5 to 3. Expected: not 0V or 5V. If 0V or 5V: replace Main PCB.
8
If all voltages are within spec: explain situation to customer.