Liftmaster 050ACTWFLK Receiver Logic Board, AC, WiFi, Lock Capable Garage Opener
The LiftMaster 050ACTWFLKMC is a lock-capable AC Wi-Fi receiver logic board for select LiftMaster and Chamberlain residential garage door openers. It is built for Security+ 2.0 systems with a yellow learn button and includes the two lock terminals used on compatible automatic garage door lock applications. In the field, this board is commonly replaced when the opener has confirmed logic board failure, damaged accessory terminals, radio receiver problems, Wi-Fi/myQ connection issues that are traced to the board, or control problems after surge or moisture exposure.
This board is not interchangeable with every 050ACT, 045ACT, 050DCT, or Bluetooth-enabled board. AC and DC opener boards, lock and non-lock boards, pre-2017 and later boards, and newer Bluetooth board families can look similar but have different firmware, terminal layouts, and model fitment. Correct identification by the original board label and opener parts diagram is critical.
Compatible With
Common applications
- Select LiftMaster AC chain drive Wi-Fi lock-capable garage door openers manufactured after 2017
- Select LiftMaster AC belt drive Wi-Fi lock-capable garage door openers manufactured after 2017
- Select Chamberlain AC chain drive and belt drive Wi-Fi lock-capable garage door openers manufactured after 2017
- Yellow learn button Security+ 2.0 systems with myQ and lock terminals
- LiftMaster 8587WL / 8587W lock-capable service applications when the original board label and parts diagram list 050ACTWFLK or 050ACTWFLKMC
Notable compatibility checks
- Must be AC, not DC.
- Must be lock-capable with the correct lock terminal layout.
- Must match Security+ 2.0 yellow learn button technology.
- Confirm whether the opener requires 050ACTWFLKMC, 050ACTWFLK, 050ACTBLKMC, 050ACTBMC, 050ACTWFMC, or another board number.
Features and Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
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| Product Type | Receiver logic board |
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| Part Number | 050ACTWFLKMC |
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| Application | AC Wi-Fi lock-capable garage door opener control board |
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| Compatible Operator Type | Select AC chain drive and AC belt drive Wi-Fi lock-capable garage door openers |
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| Security Technology | Security+ 2.0 |
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| Learn Button Color | Yellow |
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| Frequency | 315 MHz / Security+ 2.0 receiver technology |
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| Safety Monitoring | Designed for compatible monitored safety sensor systems |
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| Notes | Features myQ Wi-Fi and lock-capable terminals on compatible openers |
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Also Known As / Related Part Numbers
- 050ACTWFLKMC
- 050ACTWFLK
- LM-050ACTWFLKMC
- 050ACTBLKMC - related newer Bluetooth lock-capable AC Wi-Fi board, not automatic one-for-one replacement
- 050ACTBMC - related AC Wi-Fi board family, non-lock/variant fitment must be confirmed
- 050ACTWFMC - related AC Wi-Fi board family
- 050ACTWF - related discontinued AC Wi-Fi board family
- 045ACTWF / 45ACTWF - related AC Wi-Fi board reference
- Security+ 2.0 yellow learn button logic board
- LiftMaster AC Wi-Fi lock-capable logic board
Technician Note
When replacing this board, expect to reprogram travel limits, force settings, remotes, keypads, and myQ Wi-Fi setup. Photograph all wiring before removal and confirm the safety sensor wiring is restored exactly as required.
Before Ordering
- Match the original board part number and opener model number.
- Confirm the opener has a yellow learn button and Security+ 2.0 technology.
- Confirm the board is AC and lock-capable, with two lock terminals if the opener uses an automatic lock.
- Check whether the opener production date calls for 050ACTWFLKMC or a later Bluetooth-enabled board.
- Inspect for surge damage, water intrusion, or wiring shorts before installing a new board.
Professional Advisory
Logic board replacement involves electrical components and opener programming. If the opener has repeated board failures, damaged wiring, or unsafe door movement, have a qualified technician diagnose the system before installing another board.
Important Ordering Warnings
- Do not replace an AC board with a DC board.
- Do not assume all yellow learn button boards are interchangeable.
- A wrong logic board can cause accessory, lock, safety sensor, or programming problems.
- Safety sensors must remain connected and functioning after board replacement.
Product Questions and Answers
What does the 050ACTWFLKMC board control?
It controls receiver functions, Wi-Fi/myQ communication, accessory inputs, safety sensor monitoring, and lock-capable control functions on compatible AC garage door openers.
How do I know if my opener needs the lock-capable version?
Look for the original board number, the opener parts diagram, and the lock terminal layout. Lock-capable models are designed to work with an automatic garage door lock.
Is 050ACTWFLKMC the same as 050ACTBLKMC?
No. 050ACTBLKMC is a related Bluetooth-enabled lock-capable board family for later applications. It should not be treated as an automatic replacement unless the parts diagram confirms it.
Will remotes and keypads still work after replacing the board?
They normally need to be programmed again because the receiver memory is on the logic board.
Can this board be used on DC Wi-Fi openers?
No. This is for select AC Wi-Fi lock-capable models. DC openers use different board families and must be matched separately.
