What Causes CH05 on LG Dual Inverter Inverter ACs?

LG Dual Inverter serial communication line packet loss between Micom chips.

How Our Diagnostic Lab Fixes This Motherboard

Oscilloscope check on communication pin 3. Replace optocoupler ICs, check 300V PFC circuit, and inspect communication diode D01 & D02.

Oscilloscope Wave Analysis Inspect bus signals and PWM drive gates.

Infrared Rework & Desoldering Safe component replacement with zero track lift.

Full-Load Compressor Rig Test 30-minute burn-in simulation under live load.

90-Day Warranty Seal Insured return courier across 19,000 pin codes.

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Stuck Diagnosing LG Dual Inverter CH05? Send PCB photo or error symptoms directly to our lab engineers on WhatsApp for quick confirmation.

Reported Symptoms: Indoor unit beeps and displays CH 05. Outdoor compressor remains completely silent.

Technical Cause: LG Dual Inverter serial communication line packet loss between Micom chips.

Oscilloscope check on communication pin 3. Replace optocoupler ICs, check 300V PFC circuit, and inspect communication diode D01 & D02.

Send your board to our dedicated testing lab via all-India courier pickup for high-voltage bench diagnostics and 90-day replacement warranty.