LiftMaster 45ACT Security+ 2.0 Receiver Logic Board – Yellow Learn Button

LiftMaster

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LiftMaster 45ACT Security+ 2.0 Receiver Logic Board

The LiftMaster 45ACT Receiver Logic Board is a replacement control board for select LiftMaster and Chamberlain AC chain-drive and belt-drive garage door openers manufactured after 2011. It uses Security+ 2.0 technology and is identified by a yellow learn button.

The logic board controls the opener’s primary electronic functions, including motor operation, remote-control communication, wireless-keypad programming, safety-sensor processing, travel limits, force settings, lighting, and wall-control communication.

Product Features

• Genuine LiftMaster replacement receiver logic board
• Model: 45ACT
• Current replacement number: 045ACTMC
• Security+ 2.0 technology
• Yellow learn button
• Designed for select AC chain-drive and belt-drive openers
• Intended for compatible openers manufactured after 2011
• Restores remote-control and wireless-keypad communication
• Controls safety sensors, motor operation, travel, force, and lighting functions
• Suitable for replacing a damaged, burned, corroded, or malfunctioning original board

Common Symptoms of a Failing Logic Board

The logic board may require replacement when the garage door opener:

• Has power but does not operate correctly
• Does not respond to compatible remote controls or wireless keypads
• Operates intermittently or unpredictably
• Has visible burn marks, corrosion, or damaged components
• Stops working after a power surge or electrical event
• Does not correctly process safety-sensor signals
• Has lighting or wall-control communication problems
• Will not retain programmed accessories or operating settings

These symptoms may also be caused by damaged wiring, misaligned safety sensors, failed remotes, power-supply problems, a defective wall control, or another opener component. Proper diagnosis is recommended before replacing the board.

Compatibility

The LiftMaster 45ACT is designed for various compatible LiftMaster and Chamberlain AC chain-drive and belt-drive garage door openers manufactured after 2011.

The opener must use:

• Security+ 2.0 technology
• A yellow learn button
• The same compatible logic-board configuration
• An AC chain-drive or belt-drive operating system

Also known as:

• 045ACT
• 045ACTMC
• 1D7675
• 041D7675
• 041D7656
• 001D7675
• 41D7656

Compatibility must be confirmed using the number printed on the original logic board, the garage door opener model number, the owner’s manual, or the opener’s replacement-parts diagram.

A yellow learn button alone does not guarantee compatibility. Several different Security+ 2.0 logic boards use yellow learn buttons but are designed for different opener models and features.

Important Wi-Fi Compatibility Notice

The 45ACT is intended for compatible non-Wi-Fi Security+ 2.0 garage door openers.

Do not use this board as a replacement for a Wi-Fi-enabled or Bluetooth-enabled opener unless the opener’s parts diagram specifically identifies the 45ACT or 045ACTMC as the correct replacement.

Wi-Fi and Bluetooth-enabled opener models may require a different logic board.

Programming After Installation

After installing the replacement board, the opener’s settings and accessories may need to be programmed again, including:

• Remote controls
• Wireless keypads
• Vehicle HomeLink systems
• Travel limits
• Force settings
• Wall-control settings
• Light and lock functions

Follow the programming instructions for the specific garage door opener model.

Package Contents

• One LiftMaster 45ACT Security+ 2.0 receiver logic board

The end panel, travel module, capacitor, wiring harness, wall control, remote controls, safety sensors, and other opener components are not included unless specifically shown or stated with the product.

Installation Requirements

Before ordering or installing the board:

• Confirm the number printed on the original logic board
• Verify the opener has a yellow learn button
• Check the garage door opener model number
• Review the opener’s replacement-parts diagram
• Disconnect electrical power from the opener
• Disconnect battery power when applicable
• Photograph and label all wire connections
• Inspect the opener for surge damage or damaged wiring
• Confirm that the replacement board matches the original connection layout

Installation and Safety

Disconnect electrical power and battery power before opening the garage door opener housing or handling internal components.

Logic boards contain electronic components that may be damaged by static electricity, incorrect wiring, moisture, or electrical surges. Avoid touching the board’s circuits and connection points unnecessarily.

After installation, program the travel and force settings according to the opener manufacturer’s instructions. Test the safety-reversal system and photo-eye sensors before returning the garage door opener to normal service.

Installation by a qualified garage door technician is recommended when the cause of the opener failure has not been properly diagnosed.

LiftMaster 45ACT Security+ 2.0 Logic Board – Yellow Learn Button

LiftMaster 45ACT replacement Security+ 2.0 receiver logic board for select AC chain-drive and belt-drive garage door openers manufactured after 2011 with a yellow learn button.