Customer Questions and Answers for Main Control Board (Pcb Assembly) by Lg

This main control board is the appliance's central electronics module, also called the main PCB assembly. It manages power and coordinates sensors and user commands so the unit runs correctly, restoring normal operation when the original board fails. What it does

• Controls and coordinates motors, fans, valves, and other components based on inputs
• Processes signals from sensors and the user interface to execute functions
• Manages timing and safety interlocks for reliable operation
• Common symptoms of a failed board: unit won't power on/start, unresponsive or erratic controls/display, intermittent shutdowns, or error codes

• One main PCB assembly

• Disconnect power to the appliance before servicing; avoid ESD by handling the board by the edges and using grounding protection
• Move connectors one at a time to matching positions; transfer any brackets, covers, or jumpers from the original board
• Ensure all plugs are fully seated and the board is mounted securely
• Some models require a control reset or service test after installation—follow the service manual for your model