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

1. undefined: 1. Check loose connections between Main PCB (CON3) and Sub PCB (CON1). 2. undefined: 2. Measure voltage at Sub CON1 Pin 8 to Pin 33. Expected: Not 0 V or 5 V (varying). If stuck at 0 or 5 V, check sub PCB connection or replace Sub PCB. 3. undefined: 3. Measure voltage at Sub CON1 Pin 10 to Pin 33. Expected: Not 0 V or 5 V. If stuck, replace Sub PCB. 4. undefined: 4. Measure voltage at Main CON3 Pin 1 to Pin 15. Expected: Not 0 V or 5 V. If stuck, check Display PCB loose connection or replace Display PCB. 5. undefined: 5. Measure voltage at Main CON3 Pin 3 to Pin 15. Expected: Not 0 V or 5 V. If stuck, check Display PCB loose connection or replace Display PCB. 6. undefined: 6. If all voltage checks pass, explain to customer (intermittent Sub PCB communication).

LG Refrigerators

Error Code E Sd

Sub PCB Communication Error — Main MICOM to Sub MICOM

Moderate

Address soon - your appliance may not work properly

How to Fix

1
1. Check loose connections between Main PCB (CON3) and Sub PCB (CON1).
2
2. Measure voltage at Sub CON1 Pin 8 to Pin 33. Expected: Not 0 V or 5 V (varying). If stuck at 0 or 5 V, check sub PCB connection or replace Sub PCB.
3
3. Measure voltage at Sub CON1 Pin 10 to Pin 33. Expected: Not 0 V or 5 V. If stuck, replace Sub PCB.
4
4. Measure voltage at Main CON3 Pin 1 to Pin 15. Expected: Not 0 V or 5 V. If stuck, check Display PCB loose connection or replace Display PCB.
5
5. Measure voltage at Main CON3 Pin 3 to Pin 15. Expected: Not 0 V or 5 V. If stuck, check Display PCB loose connection or replace Display PCB.
6
6. If all voltage checks pass, explain to customer (intermittent Sub PCB communication).

This Error Applies To

LG LCFC26XSS Series Refrigerators

Service manual exact match: LCFC26XSSService manual exact match: LCFC26XSWService manual exact match: LCFC26XSBService manual exact match: LF31T6230SSService manual exact match: LF31T6230SWService manual exact match: LF31T6230SB