EBR77627403 Genuine PCB Assembly Sub for LG Appliances, LG Sub Control Board, Secondary PCB Replacement Part

This is genuine LG PCB assembly EBR77627403, listed as a sub board. In LG appliances a sub PCB handles part of the electronics on behalf of the main board, and it connects back to it through a harness or ribbon cable. We don't have the LG product or model numbers it belongs to. A match on the number printed on your old board is the best confirmation.

Telling a sub board fault from a main board fault

Because the main and sub boards talk to each other, a fault in either one can look the same. Clues that point to the sub board are problems limited to one area, such as a single bank of buttons, one part of the display, or one group of functions, while everything else works. A communication error code between the boards can come from either board or the cable linking them. Reseat that cable and inspect it for damage before deciding. Moisture is a common cause of sub board failure, so look for corrosion.

Part details

• Genuine LG part EBR77627403
• Sub PCB assembly
• Connects to the main board by harness or ribbon cable
• LG product and models not on file

Replacing the sub PCB

Make the appliance safe first by switching off and unplugging it, or have a licensed electrician isolate a hard-wired unit. Note how any ribbon cable locks into its socket, as these latches break easily. Fit the new board, reconnect everything, and test the area of the appliance that had the fault.

Questions about this part

What's the difference between EBR77627403 and EBR77627404?

They're separate LG part numbers, and our records don't say how they differ. Order the number that matches your old board, or the one LG specifies for your model. If you're unsure, send your model number through the parts enquiry form.