The LG EBR86771819 Washer Main PCB Assembly. This replacement printed circuit board serves as the central control component of a compatible washing machine, managing communication between the user interface, sensors, motor, and other internal systems. It works by processing commands and coordinating wash cycles, water levels, spin functions, and additional operating features. Designed for use with select washer models, it helps ensure that key appliance functions perform as intended. Replacing a faulty PCB assembly can help resolve control-related issues, improve operational reliability, and support consistent washing performance while extending the useful life of the appliance.