The LiftMaster 41A5483-4C Receiver Logic Board Assembly is an OEM replacement circuit board designed to restore the control and radio receiver functions of select LiftMaster, Chamberlain, and compatible Sears Craftsman residential garage door openers. This assembly manages the opener’s motor control, remote and keypad reception, safety sensor logic, and work light timing. It is intended for units that use LiftMaster Security+ technology with a purple Learn button (commonly associated with 315 MHz remotes such as 371LM/372LM/373LM and keyless entry models like 377LM). For proper fit, match the exact part number 41A5483-4C printed on your original board or your opener’s parts list; compatibility is model-specific and boards with similar numbers but different suffixes are not always interchangeable.
Installation involves disconnecting power, removing the opener’s cover, transferring the wall control and photo-eye wires to the corresponding terminals on the new board, mounting the assembly, and then reapplying power. After replacement, all remote controls and wireless keypads must be reprogrammed using the Learn button, and you may need to recheck travel and force settings according to the opener’s manual. This receiver logic board is intended for North American residential AC-powered trolley-style openers and requires functional safety reversing sensors for compliant operation. Observe electrostatic handling precautions and follow all manufacturer safety instructions. If your existing opener does not have a purple Learn button or your original part number differs from 41A5483-4C, consult the model’s service manual to identify the correct logic board before ordering.