Restore the advanced communication and display functions of your cooling system with the LG 6871A20363G Air Conditioner Sub PCB. This auxiliary printed circuit board acts as a critical bridge between the user and the main control system. Typically responsible for managing the LED display, infrared (IR) remote receiver, and button interface, this Sub PCB ensures that your commands are accurately processed and that the unit's status is clearly communicated. If your air conditioner is unresponsive to the remote, has a blank display, or shows garbled characters, this genuine replacement board is the required professional solution.

The 6871A20363G is manufactured with high-grade multi-layer circuitry and moisture-resistant soldering to protect against the humidity found in HVAC environments. Each board is factory-programmed with the specific logic required to synchronize perfectly with the main power PCB, ensuring seamless operation across all cooling and heating modes.

1. Safety First: Turn off the air conditioner and completely disconnect it from the power source (unplug it or switch off the dedicated circuit breaker). Wait 5 minutes for internal capacitors to discharge.
2. Access the Control Panel: Open the front intake grille and remove the plastic covers surrounding the display area. You may need to remove the main front cabinet.
3. Locate the Sub PCB: The board is usually mounted directly behind the display window or the manual control buttons.
4. Disconnect the Wiring: Carefully unplug the ribbon cables or wire harnesses connected to the 6871A20363G. These are delicate; pull by the connector, not the wires.
5. Swap the Board: Unscrew the mounting screws or release the plastic clips holding the old board. Align the new board and secure it in place.
6. Reassemble and Test: Reconnect the wiring harnesses, ensuring they are seated firmly. Replace the unit covers and restore power. Test the remote control and display to verify full functionality.

1. AC Interface/Display Control Board – Part Number: 6871A20363G
2. User Interface Management: Restores remote control responsiveness and LED display clarity.
3. Corrosion-Resistant Coating: Features a protective layer to prevent circuitry failure in high-humidity conditions.
4. Precision Logic Integration: Pre-programmed to communicate flawlessly with the main system PCB.
5. High-Quality IR Receiver: Ensures a wide-angle range for remote control signals.
6. OEM-Quality Part: A genuine LG replacement component designed to meet original factory performance and safety standards.