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

1. undefined: Step 1: Check all loose connections between Main PCB and Sub PCB. 2. undefined: Step 2: Measure voltage at Sub CON1 pins 8-33 — expected NOT 0 or 5V; if 0 or 5V, check Sub PCB connection and if normal, replace Sub PCB. 3. undefined: Step 3: Measure voltage at Sub CON1 pins 10-33 — expected NOT 0 or 5V; if 0 or 5V, check Sub PCB connection and replace Sub PCB. 4. undefined: Step 4: Measure voltage at Main CON3 pins 1-15 — expected NOT 0 or 5V; if 0 or 5V, check Display PCB loose connection and replace Display PCB. 5. undefined: Step 5: Measure voltage at Main CON3 pins 3-15 — expected NOT 0 or 5V; if 0 or 5V, check Display PCB loose connection and replace Display PCB. 6. undefined: Step 6: If all checks are normal, explain to customer.

LG Refrigerators2023–present

Error Code E Sd

Q: What does error code E Sd mean on a LG refrigerators?

Sub PCB Communication Error — Main MICOM and Sub MICOM Defective Tx or Rx communication line; Defective Sub PCB; Loose connector between Main PCB and Sub PCB

Sub PCB Communication Error — Main MICOM and Sub MICOM

Moderate

Address soon - your appliance may not work properly

What This Means

Defective Tx or Rx communication line; Defective Sub PCB; Loose connector between Main PCB and Sub PCB

How to Fix

1
Step 1: Check all loose connections between Main PCB and Sub PCB.
2
Step 2: Measure voltage at Sub CON1 pins 8-33 — expected NOT 0 or 5V; if 0 or 5V, check Sub PCB connection and if normal, replace Sub PCB.
3
Step 3: Measure voltage at Sub CON1 pins 10-33 — expected NOT 0 or 5V; if 0 or 5V, check Sub PCB connection and replace Sub PCB.
4
Step 4: Measure voltage at Main CON3 pins 1-15 — expected NOT 0 or 5V; if 0 or 5V, check Display PCB loose connection and replace Display PCB.
5
Step 5: Measure voltage at Main CON3 pins 3-15 — expected NOT 0 or 5V; if 0 or 5V, check Display PCB loose connection and replace Display PCB.
6
Step 6: If all checks are normal, explain to customer.