Liftmaster 45ACT / 045ACT Replacement Logic Control Board for Garage Opener
The LiftMaster 045ACTMC is a replacement Security+ 2.0 receiver logic board used in select post-2011 LiftMaster and Chamberlain AC garage door openers with a yellow learn button. The receiver logic board is the main control board for many opener functions, including remote-control programming, wall-control input, motor commands, safety sensor monitoring, and travel or force behavior depending on the opener platform. A failed board may cause symptoms such as no response from remotes, programming failure, intermittent operation, light or wall-control issues, safety-sensor errors, or a completely unresponsive opener after power and wiring have been checked. Because LiftMaster used several similar-looking boards across AC, DC, Wi-Fi, and non-Wi-Fi openers, part number matching is critical. This board should be selected by the original board number, opener model, yellow learn button technology, and the opener parts diagram.
Compatible With
- Select LiftMaster AC chain drive and belt drive garage door openers manufactured after 2011 with yellow learn button Security+ 2.0 technology
- Select Chamberlain AC chain drive and belt drive garage door openers manufactured after 2011 with yellow learn button Security+ 2.0 technology
- LiftMaster 8557 3/4 HP AC belt drive opener when listed by parts diagram
- LiftMaster 8155 1/2 HP AC belt drive opener when listed by parts diagram
- LiftMaster 8165 1/2 HP AC chain drive opener when listed by parts diagram
- LiftMaster 8365 1/2 HP AC chain drive opener when listed by parts diagram
- LiftMaster 8075 1/2 HP AC chain drive opener when listed by parts diagram
- LiftMaster 8355 1/2 HP AC belt drive opener when listed by parts diagram
- LiftMaster 8065 1/2 HP AC chain drive opener when listed by parts diagram
- LiftMaster 8587 3/4 HP AC chain drive opener when listed by parts diagram
- Not a direct substitute for 050ACTWF / 050ACTWFMC Wi-Fi boards unless the official replacement chart confirms it
Also Known As / Related Part Numbers
- 045ACTMC
- 045ACT
- 45ACT
- 45ACTMC
- 041D7675
- 41D7675
- Security+ 2.0 receiver logic board
- yellow learn button logic board
- LiftMaster 045ACT replacement board
Features & Specifications
| Manufacturer | LiftMaster / Chamberlain |
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| Product Type | Receiver logic board |
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| Part Number | 045ACTMC |
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| Technology | Security+ 2.0 |
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| Learn Button Color | Yellow |
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| Application | Select post-2011 AC chain and belt drive residential garage door openers |
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| Compatible Operator Type | AC residential garage door openers |
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| Related Numbers | 045ACT, 45ACT, 45ACTMC, 041D7675 |
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| Notes | Model, date, and connector layout must match before ordering |
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Technician Note
Before replacing a logic board, verify incoming power, safety sensor alignment, wall-control wiring, lock mode, and remote batteries. Board replacement should be based on diagnosis, not only on one symptom.
Before Ordering Checklist
- Confirm the opener model number and manufacture date.
- Confirm the existing board has a yellow learn button.
- Compare the original board number and connector layout.
- Check whether the opener is Wi-Fi or non-Wi-Fi.
- Plan to reprogram remotes, keypads, and travel settings after board replacement.
Professional Advisory
Unplug the opener before servicing the logic board. If the opener has damaged wiring, power surges, water intrusion, or unsafe door movement, have a qualified garage door technician inspect the unit.
Important Ordering Warnings
- 045ACTMC is not automatically interchangeable with every 045ACT or 050ACT board.
- Using the wrong board can cause programming, accessory, or motor-control problems.
- A failed safety sensor circuit should not be bypassed to make the opener run.
Product Questions and Answers
What openers commonly use the 045ACTMC board?
It is commonly listed for select post-2011 LiftMaster and Chamberlain AC chain and belt drive openers with a yellow learn button, including models such as 8557, 8155, 8165, 8365, 8075, 8355, 8065, and 8587 when confirmed by the parts diagram.
Is 045ACTMC for yellow learn button openers?
Yes. It is a Security+ 2.0 receiver logic board associated with yellow learn button technology.
Will I need to reprogram remotes after replacing this board?
Yes. Remote controls, keypads, and some settings normally need to be programmed again after logic board replacement.
Is this the same as a 050ACTWF Wi-Fi board?
No. Wi-Fi and non-Wi-Fi boards can differ. Match the original board number and opener model before ordering.
What symptoms can point to a bad receiver logic board?
Possible symptoms include no remote programming, no response, intermittent operation, accessory issues, or control errors after power, sensors, and wiring have been checked.
