If the freezer is still cold but the fridge section is warming up, this problem in 80% of cases is caused by restricted airflow, due to burnt defrost thermal fuse, defrost heating element, or failed evaporator fan. If your LG refrigerator is not cooling in both compartments, this cooling problem is common for double door (french door) refrigerators and in 90% of cases is related to a failed inverter linear compressor and in 10% of cases to a failed start relay.
Compressor Start relay failed (If Not Linear Compressor).LG Refrigerator Not Cooling Or Freezing.