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

1. undefined: Check all connector housings at CON101 (hinge connector between main and display PCB) and CON5 for looseness. 2. undefined: Measure voltage at CON101 pins 1-2. Expected: 12V DC. If not 12V, check hinge wiring for looseness or damage; if wiring is good, replace main PCB. 3. undefined: Measure voltage at CON101 pins 5-2. Expected: 12V DC. If not 12V, check hinge wiring; if good, replace main PCB. 4. undefined: Measure voltage at CON101 pins 3-2. Expected: Not 0V or 5V (active signal). If stuck at 0V or 5V, replace display PCB. 5. undefined: Measure voltage at CON101 pins 4-2. Expected: Not 0V or 5V. If stuck, replace main PCB. 6. undefined: Measure voltage at CON5 pins 4-3. Expected: Not 0V or 5V. If stuck, replace display PCB. 7. undefined: Measure voltage at CON5 pins 5-3. Expected: Not 0V or 5V. If stuck, replace main PCB. 8. undefined: If all signals are correct, 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 all connector housings at CON101 (hinge connector between main and display PCB) and CON5 for looseness.
2
Measure voltage at CON101 pins 1-2. Expected: 12V DC. If not 12V, check hinge wiring for looseness or damage; if wiring is good, replace main PCB.
3
Measure voltage at CON101 pins 5-2. Expected: 12V DC. If not 12V, check hinge wiring; if good, replace main PCB.
4
Measure voltage at CON101 pins 3-2. Expected: Not 0V or 5V (active signal). If stuck at 0V or 5V, replace display PCB.
5
Measure voltage at CON101 pins 4-2. Expected: Not 0V or 5V. If stuck, replace main PCB.
6
Measure voltage at CON5 pins 4-3. Expected: Not 0V or 5V. If stuck, replace display PCB.
7
Measure voltage at CON5 pins 5-3. Expected: Not 0V or 5V. If stuck, replace main PCB.
8
If all signals are correct, explain to customer.