EBR78073734 Genuine LG Main PCB Assembly, Main Electronic Control Board for LG Appliances, Service Replacement Board

EBR78073734 is a genuine LG main PCB assembly, the control board that runs the appliance. LG has released several main boards in this number series, and some of them are tied to particular production runs of the same model. That makes the number on your old board, along with the model and serial number on the appliance, the key to getting the right one. The exact LG product isn't on our records.

Faults that lead back to the main control board

The main control board is responsible for timing, sensing and switching, so its failure tends to stop the appliance outright or make it behave strangely. People report dead displays, buttons that no longer respond, programs that won't start, and error codes that return straight after a reset. Check the power supply to the board and any fuses on it, then look for burnt components. Remember that a fault code is a clue rather than a verdict, since a failed sensor or load can generate the same code.

Part details

• Genuine LG part EBR78073734
• Main PCB assembly
• Several versions exist in this LG series, check model and serial
• LG product and models not on file

Fitting the main board

Isolate the power and wait a few minutes. Hard-wired installations need a licensed electrician. Before unplugging anything, compare the old and new boards side by side to confirm the connectors line up. Transfer the plugs, refit any covers, and run the appliance to check it works properly.

Questions about this part

Why does the serial number matter for this board?

LG sometimes changes the main board partway through a model's production, so two appliances with the same model number can need different boards. Comparing the number on your old board with EBR78073734, and keeping your serial number handy, avoids ordering the wrong version.