When an LG refrigerator stops cooling while interior lights remain lit, the linear compressor is often the culprit. Older linear compressors rely on an internal piston spring design that can lose compression over time. We verify low-side suction pressure, test inverter drive output voltage from the main PCB, and replace failed units with upgraded universal LG Smart Inverter compressors—complete with factory software updates on your refrigerator's control board to match the new drive algorithm.
- Digital manifold gauge testing for correct R134a or R600a operating pressures
- Inverter PCB drive signal and compressor coil winding resistance checks
- Installation of factory-updated compressor with software flashing and high-capacity copper filter drier