LiftMaster 045ACTMC Security+ 2.0 Receiver Logic Board
The LiftMaster 045ACTMC is a Security+ 2.0 receiver logic board for select residential AC chain drive and AC belt drive garage door openers. It is the replacement-style board used after the legacy 045ACT / 41D7675 family and is most commonly identified by yellow learn button Security+ 2.0 technology.
This board controls the opener radio receiver, memory for compatible remotes and keypads, wall control communication, light control, motor command logic, and accessory communication on compatible openers. A failing board may cause failed programming, intermittent operation, no response, light-control issues, or travel-setting problems after other system faults have been ruled out.
Compatible With
Compatibility depends on the exact opener model, original part number, production generation, and parts diagram. The following models, families, and applications are commonly associated with this part where the original documentation supports the same part number or technology.
Common Compatible LiftMaster Models
- LiftMaster 8065 1/2 HP AC chain drive garage door opener
- LiftMaster 8075 1/2 HP AC chain drive garage door opener
- LiftMaster 8155 1/2 HP AC belt drive garage door opener
- LiftMaster 8165 1/2 HP AC chain drive garage door opener
- LiftMaster 8355 1/2 HP AC belt drive garage door opener
- LiftMaster 8365 1/2 HP AC chain drive garage door opener when confirmed by parts diagram
- LiftMaster 8557 3/4 HP AC belt drive garage door opener
- LiftMaster 8587 3/4 HP AC chain drive garage door opener when confirmed by parts diagram
- Select Chamberlain AC chain and belt drive yellow learn button models manufactured after 2011
Additional Compatibility Notes
- Do not use for Wi-Fi/myQ openers that require 050ACTWF / 050ACTWFMC style boards.
- Do not use for older green, red/orange, or purple learn button systems.
- Confirm original board number, motor type, connector layout, and parts diagram before ordering.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain |
| Product Type | Receiver Logic Board |
| Part Number | 045ACTMC |
| Legacy Related Part | 045ACT |
| Application | Residential garage door opener logic board replacement |
| Radio Technology | Security+ 2.0 |
| Learn Button Color | Yellow on compatible units |
| Compatible Operator Type | Select AC chain drive and AC belt drive openers |
| Notes | Not for all Wi-Fi/myQ openers; verify original board number. |
Also Known As / Related Part Numbers
This part may be searched or referenced under the following manufacturer numbers, old numbers, related numbers, catalog aliases, or common search variations. Related numbers should be verified by the original parts diagram before treating them as exact replacements.
- 045ACTMC
- 45ACTMC
- 045ACT
- 45ACT
- 041D7675
- 41D7675
- 001D7675
- 1D7675
- 041D7656
- 41D7656
- Security+ 2.0 receiver logic board
- yellow learn button logic board
- 045ACT replacement board
Technician Note
Do not order this part by appearance alone. LiftMaster, Chamberlain, Sears Craftsman, and Linear parts can look similar while using different frequencies, control circuits, connector layouts, rail generations, or production-specific hardware. Match the original part number, opener model, and parts diagram before installation.
Before Ordering, Confirm
- Original board is 045ACT, 045ACTMC, 41D7675, 41D7656, or a confirmed related number.
- Opener is a compatible AC chain or AC belt drive model manufactured after 2011.
- The opener uses a yellow learn button and Security+ 2.0 accessories.
- The opener is not a Wi-Fi model requiring a 050ACTWF-style board.
- Connector layout, end panel, and wiring match the original board.
Professional Advisory
Disconnect power before servicing any garage door opener component. For internal electrical parts, control boards, power supplies, and wiring-related failures, have the system inspected by a qualified garage door technician when there is visible damage, surge damage, unsafe door movement, or uncertainty about the diagnosis. Safety sensors and door balance should be tested after any repair.
Important Ordering Warnings
- Similar-looking parts may not be interchangeable across different opener generations.
- A compatible learn button color or brand name alone is not enough to confirm fitment.
- If the original issue was caused by wiring damage, a shorted accessory, water intrusion, or a binding door, the replacement part may fail again unless the root cause is corrected.
Questions & Answers
What models commonly use the 045ACTMC board?
Common LiftMaster references include select 8065, 8075, 8155, 8165, 8355, 8365, 8557, and 8587 AC opener models.
What older numbers are related to 045ACTMC?
Related numbers include 045ACT, 45ACT, 041D7675, 41D7675, 001D7675, 1D7675, 041D7656, and 41D7656.
Is this for yellow learn button openers?
Yes. The 045ACTMC is for select Security+ 2.0 yellow learn button AC chain and belt drive openers.
Will this work with Wi-Fi myQ openers?
Not automatically. Some Wi-Fi myQ openers require 050ACTWF or 050ACTWFMC style boards instead.
What needs to be programmed after replacement?
Remotes and keypads usually need to be reprogrammed, and travel or force settings may need to be checked after board replacement.
