LiftMaster 041AC050-2M Receiver Logic Board – 315 MHz, Purple Learn Button

The LiftMaster 041AC050-2M is a replacement receiver logic board and end-panel assembly for select LiftMaster, Chamberlain, and Sears Craftsman AC chain-drive garage door openers equipped with a purple learn button.

This board controls the opener’s motor functions, travel, safety sensors, wall control, lighting, and wireless accessories. Its integrated 315 MHz Security+ receiver communicates with compatible purple-learn-button remotes and keypads.

Product Details

• Manufacturer: LiftMaster

• Part number: 041AC050-2M

• Also known as: 41AC050-2M, 41AC050-2 and 41AC050

• Product type: Receiver logic board with end panel

• Frequency: 315 MHz

• Security technology: Security+

• Learn-button color: Purple

• Drive type: AC chain drive

• Production period: Commonly used from 2005 through 2015

• Light socket: Included with the assembly

Compatibility

This receiver logic board is commonly used with the following purple-learn-button AC chain-drive openers:

LiftMaster

• 3265

Chamberlain

• PD610D

• PD612D

• PD612DM

• PD612KLD

• 7520D

• 48930D

• HD400D

• LW3000

Sears Craftsman

• 139.53985D

• 139.53985DM

The board may fit additional LiftMaster, Chamberlain, or Craftsman models when the original board is marked 41AC050-2M and the opener uses a purple 315 MHz learn button.

Important: The opener model alone is not sufficient to guarantee compatibility. Some opener families were manufactured with different boards during different production periods. Before ordering, confirm all of the following:

• The original logic board is marked 41AC050-2M, 041AC050-2M, or an approved replacement number

• The opener has a purple learn button

• The opener uses 315 MHz Security+ technology

• The opener is an AC chain-drive model

• The end-panel and light-socket arrangement matches

• The replacement-parts diagram specifies this board

Not Compatible With

• Yellow-learn-button Security+ 2.0 openers

• Red or orange-learn-button 390 MHz openers

• Green-learn-button Billion Code openers

• AC belt-drive openers using the 41AB050 board family

• DC-powered garage door openers

• Wi-Fi or myQ logic boards unless specifically listed as compatible

• 041AC050-1M boards unless the opener’s parts diagram approves the substitution

Common Signs of a Failed Logic Board

• Opener does not respond to compatible remotes or keypads

• Learn button does not enter programming mode

• Intermittent or unpredictable opener operation

• Opener light behaves incorrectly

• Motor fails to activate even though power is present

• Visible corrosion, burn marks, or surge damage

• Wireless range becomes unusually short

Before Replacing the Board

Inspect the power supply, wall control, safety sensors, wiring, motor capacitor, RPM sensor, and door balance. Problems with these components can produce symptoms similar to a failed logic board.

After Installation

• Reprogram all remote controls

• Reprogram the wireless keypad

• Test the wall control

• Verify both safety-sensor indicator lights

• Test the opener light

• Confirm complete opening and closing travel

• Perform the required safety-reversal test

Disconnect electrical power before removing the opener cover. If the original board shows signs of water intrusion, burned wiring, or electrical-surge damage, have the opener inspected by a qualified garage door technician before installing the replacement.

Order the LiftMaster 041AC050-2M receiver logic board to restore control and 315 MHz wireless operation to a compatible purple-learn-button AC chain-drive garage door opener.