Fix Overall Malfunctions & Restore Basic Cooling：Old mainboard causes cooling issues, circuit gets repaired after replacement, fridge refrigeration and freezing functions work as intended Regular Compressor Start-Stop & Extend Compressor Service Life：Out-of-control fridge mainboard triggers frequent compressor activation; replacement brings orderly start-stop to cut component wear and extend service life Recover Full Display Functions for Easy Operation：Damaged mainboard leads to unresponsive screen and buttons; replacement enables normal temperature adjustment, mode selection and fault alerts on fridge Lower Overall Operating Noise for Quiet Household Use：Disordered mainboard creates loud noises from fan and compressor; replacement stabilizes fridge operation and greatly cuts indoor noise levels Compatible for LG, EBR86063015