LG Washer/Dryer Combo PCB Assembly, Display / Display Control Board / User Interface EBR78923311

Is This the Right Part?

Common Symptoms

• Display is blank, dim, flickering, or shows missing/incorrect information.
• Buttons or cycle-selection inputs do not respond consistently.
• The appliance cannot accept cycle selections or may not start from the user interface.
• Intermittent display or input operation caused by a loose display-board wiring connection or board communication fault.
• Visible scorching or damaged components on the display PCB.

Check Before Replacing

• Disconnect appliance power before servicing or inspecting the board.
• Perform a safe power reset and check whether the display and controls recover; persistent failure warrants further service diagnosis.
• With power disconnected, visually inspect the display-board area and wiring connectors for looseness, corrosion, moisture, or obvious damage.
• Confirm that the appliance has power and that the symptom is limited to the display/user-interface functions before identifying this PCB as the likely fault.
• Verify the replacement board number against the appliance model and the original board markings before installation.

Pro Tip

Part Details

Installation Notes

• Disconnect the appliance from power and other utilities before service.
• Wear work gloves and appropriate safety equipment when handling the appliance and PCB.
• Use the appliance service documentation or owner’s manual for the model-specific access, connector, and reassembly procedure.
• Verify the part number and physical fit before installation because similar-looking boards can have dimensional or connector differences.
• After reassembly, restore utilities and verify display and control operation before normal use.

Verified Compatible Models

FH399RYN, WM3997HWA, WM3997HWA/00, WM3997HWA/01, WM3998HBA

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