Restore the high-efficiency performance and precise motor control of your system with the LG Air Conditioner Inverter PCB (EBR79838602). Often referred to as the "onboarding" or power module PCB, this sophisticated circuit board is the intelligence behind your unit’s variable-speed operation. It converts incoming AC power into a controlled DC signal to drive the inverter compressor at varying speeds. If your air conditioner is displaying inverter communication error codes, the compressor fails to ramp up, or the unit trips the breaker immediately upon starting the cooling cycle, this PCB is likely the component requiring replacement.

The EBR79838602 is engineered with heavy-duty capacitors and heat-synced power transistors designed to handle the high electrical loads of modern, energy-saving HVAC systems. Replacing a faulty inverter board is essential for maintaining the whisper-quiet operation and low energy consumption that defines LG’s inverter technology.

1. Critical Safety Protocol: Completely power off the air conditioner and shut off the dedicated circuit breaker. Warning: Inverter boards contain high-voltage capacitors that can hold a lethal charge for several minutes after power is disconnected. Wait at least 10–15 minutes before touching the board.
2. Access the Control Compartment: For split systems, remove the top or side panel of the outdoor unit. For window units, remove the outer cabinet to locate the inverter assembly.
3. Map the Connections: Take clear, high-resolution photographs of all wire harnesses and high-voltage leads. Pay close attention to the colors and positions of the wires leading to the compressor.
4. Remove the Old PCB: Carefully unplug all connectors. Unscrew the board from its mounting plate or release the plastic clips. If the board is attached to a heat sink, you may need to gently pry it loose from the thermal paste.
5. Install the New Board: Secure the new EBR79838602 PCB in place. If required, apply a thin layer of fresh thermal grease to the heat sink area. Reconnect all wiring harnesses exactly as shown in your reference photos.
6. Reassemble and Test: Replace all protective covers and panels. Restore power at the breaker and turn the unit on. Allow a few minutes for the system to perform its startup self-check and verify that the compressor starts smoothly and operates at variable speeds.
7. Compatible with select LG inverter air conditioner models, this OEM-quality inverter PCB ensures seamless communication between the controller and the compressor for maximum energy efficiency.

1. AC Inverter PCB / Power Module – Part number EBR79838602
2. Variable Speed Control – Manages the frequency and voltage sent to the inverter compressor
3. Resolves Inverter Faults – Fixes "DC Link" errors, compressor startup failures, and communication loss
4. High-Grade Components – Features robust capacitors and transistors for long-term electrical stability
5. Optimizes Energy Usage – Enables the unit to run at lower speeds once the target temperature is reached
6. Genuine OEM Part – Pre-configured for exact compatibility and safety with LG inverter systems