How do I fix error code E Sd on my LG LRYKC2606S?

1. undefined: Check all loose connections between Main PCB and Sub PCB. 2. undefined: Check Sub CON1 8th-to-33rd-pin voltage: should NOT be 0 or 5 V (data). If stuck, check Sub PCB connection then replace Sub PCB. 3. undefined: Check Sub CON1 10th-to-33rd-pin voltage: should NOT be 0 or 5 V. If stuck, replace Sub PCB. 4. undefined: Check Main CON3 1st-to-15th-pin voltage: should NOT be 0 or 5 V. If stuck, check hinge connection then replace Display PCB. 5. undefined: Check Main CON3 3rd-to-15th-pin voltage: should NOT be 0 or 5 V. If stuck, replace Display PCB. 6. undefined: If all pass, explain to customer.

LG LRYKC2606SRefrigerator

Error Code E Sd

Sub PCB communication error

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Check all loose connections between Main PCB and Sub PCB.
2
Check Sub CON1 8th-to-33rd-pin voltage: should NOT be 0 or 5 V (data). If stuck, check Sub PCB connection then replace Sub PCB.
3
Check Sub CON1 10th-to-33rd-pin voltage: should NOT be 0 or 5 V. If stuck, replace Sub PCB.
4
Check Main CON3 1st-to-15th-pin voltage: should NOT be 0 or 5 V. If stuck, check hinge connection then replace Display PCB.
5
Check Main CON3 3rd-to-15th-pin voltage: should NOT be 0 or 5 V. If stuck, replace Display PCB.
6
If all pass, explain to customer.