The LiftMaster 045DCT is a replacement receiver logic board for select LiftMaster DC-powered garage door openers that use Security+ 2.0 and MyQ technology. As the control center of the operator, this board manages the DC motor, soft start/stop operation, travel limits, safety reversing sensors, wall control inputs, and pairing with remotes and keypads. It is designed for residential applications and restores proper performance when the original control board fails or remotes become unresponsive. The 045DCT platform supports MyQ accessories for smart control; if your opener does not have built-in Wi‑Fi, app control typically requires a compatible MyQ Internet Gateway (such as 828LM) sold separately.
Engineered for Security+ 2.0 systems, the 045DCT uses a yellow LEARN button and works with tri-band 310/315/390 MHz Security+ 2.0 remote controls and wireless keypads. This part is not universal; verify your opener’s model and the existing board label for “045DCT” before ordering, as Wi‑Fi “W” variants commonly use different assemblies (e.g., 050DCTWF). Installation involves disconnecting power, removing the original board, transferring all terminal connections one-for-one (wall control, photo-eyes, traveler, etc.), mounting the new board, then restoring power to reprogram remotes and travel limits via the LEARN function. For safety and compliance, ensure photo-eye sensors are correctly wired and aligned; never bypass safety devices.