The LiftMaster 41A5021-I Receiver Logic Board Assembly is a genuine replacement control board for select LiftMaster residential garage door openers that use the Security+ 315 MHz radio system. As the central controller, it manages the opener’s motor operation, integrated radio receiver for remote controls, safety reversing sensors, wall control input, and courtesy lighting. This assembly is typically used in chain-drive and belt-drive AC motor units from the mid-2000s era that feature a purple Learn button, and it pairs with Security+ 315 MHz accessories such as remotes in the 371LM/372LM/373LM family and the 377LM wireless keypad. It is not compatible with newer Security+ 2.0 (yellow Learn button) systems or older 390 MHz platforms.
Installation involves disconnecting power, transferring wire leads to the labeled terminals on the new board, mounting the assembly in the opener head, and reconnecting the safety sensors and wall control. After power is restored, remotes and keypads must be reprogrammed using the Learn button on the opener; travel and force adjustments should be checked and set per the opener’s manual. The board operates on the opener’s standard North American power input and maintains the encrypted rolling-code security of Security+. For best results, match the part number on your existing board and verify the Learn button color on the opener. Always disconnect power before servicing and ensure the safety reversing sensors are correctly aligned and functional after replacement.