LG Main refrigerator electronic control board / main PCB assembly EBR78940501, Replaces EBR78940502

Is This the Right Part?

✅ Cross Reference Information

Common Symptoms

• Refrigerator or freezer fails to maintain temperature
• Irregular or failed defrost operation
• Refrigerator control panel or electronically controlled functions do not respond properly
• Cooling system runs continuously or does not start when commanded
• Refrigerator displays error codes associated with control operation

Check Before Replacing

• Confirm the refrigerator has power and that the outlet, power cord, and circuit protection are functioning normally.
• Record any displayed error codes and compare them with the appliance’s service documentation before replacing the board.
• Check that control-panel settings are enabled and that the refrigerator is not in a showroom/demo mode.
• With power disconnected, visually inspect accessible wiring harnesses and board connectors for loose, backed-out, pinched, or damaged connections.
• Do not assume the board is defective until more commonly failed components and wiring have been checked by a qualified technician.

Pro Tip

Part Details

Installation Notes

• Safely store or protect perishable food while the refrigerator is powered off.
• Unplug the refrigerator before beginning installation.
• Wear work gloves to help protect hands during replacement.
• Match all connectors and board labeling to the original part, and do not force connectors.
• If board-level electrical diagnosis is required, use a qualified appliance technician.

Verified Compatible Models

LFXS29626B, LFXS29626B/00, LFXS29626B/01, LFXS29626S, LFXS29626S/00, LFXS29626S/01, LFXS29626W, LFXS29766S, LFXS29766S/00, LFXS29766S/01

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.