Sears Craftsman 139.53930D / LiftMaster 41AC050-1M Receiver Logic Board
The Sears Craftsman 139.53930D / LiftMaster 41AC050-1M receiver logic board is used in select Chamberlain-built Sears Craftsman garage door openers using 315 MHz Security+ radio technology. It is the main electronic board inside the opener head and is responsible for receiving commands from compatible 371LM-style remotes, 377LM-style wireless keypads, and hardwired wall controls, then sending the proper signals to the motor, lights, travel circuit, and safety sensor circuit.
This board may be needed when the opener has power but will not respond correctly to remotes, will not accept programming, has inconsistent light operation, fails to communicate with the wall station, or has visible electronic damage. Those symptoms can also be caused by bad safety sensors, damaged wiring, a failed wall console, a bad motor capacitor, or door travel problems, so the board should be matched and diagnosed carefully before replacement.
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 Models and Systems
- Sears Craftsman 139.53930D garage door opener applications
- LiftMaster / Chamberlain board family 41AC150-1 and 41AC050-1M
- Select AC chain drive openers using 315 MHz Security+ purple learn button technology
- Systems using compatible 371LM remote controls
- Systems using compatible 377LM wireless keyless entry keypads
- Select post-1997 / pre-Security+ 2.0 Chamberlain-built residential openers when confirmed by parts diagram
Additional Compatibility Notes
- Do not use for yellow learn button Security+ 2.0 systems.
- Do not use for red/orange 390 MHz or green billion-code systems unless the parts diagram specifically confirms the board.
- Confirm the Sears model number and original board label because 41AC050-1M and 41AC050-2M are not the same board.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain / Sears Craftsman |
| Product Type | Receiver Logic Board |
| Part Number | 41AC050-1M |
| Related Sears Model | 139.53930D |
| Application | Residential garage door opener logic board replacement |
| Radio Technology | 315 MHz Security+ |
| Learn Button Color | Purple on compatible units |
| Compatible Operator Type | Select AC chain drive residential garage door openers |
| Notes | Match original board number, opener model, and connector layout before ordering. |
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.
- 41AC050-1M
- 041AC050-1M
- 41AC050-1
- 41AC150-1
- 041AC150-1
- Sears Craftsman 139.53930D logic board
- 139.53930D receiver logic board
- 315 MHz purple learn button board
- Security+ logic board
- 371LM remote compatible board
- 377LM keypad compatible 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 label shows 41AC050-1M, 41AC150-1, or a confirmed related number.
- Opener model is Sears Craftsman 139.53930D or a confirmed matching Chamberlain-built model.
- System uses 315 MHz Security+ radio technology with a purple learn button.
- Connector layout, light socket wiring, and end panel style match the original board.
- Safety sensors, wall control wiring, and incoming power have been checked before replacing the 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
Is 41AC050-1M used with Sears Craftsman 139.53930D openers?
Yes. The 41AC050-1M board is commonly associated with Sears Craftsman 139.53930D and the related 41AC150-1 board family.
What remotes are commonly used with this board?
Compatible systems are commonly associated with 315 MHz Security+ accessories such as the 371LM remote and 377LM wireless keypad.
Is this the same as 41AC050-2M?
No. 41AC050-1M and 41AC050-2M are related board families but are tied to different opener model references and should not be treated as interchangeable without a parts diagram.
Will this work with yellow learn button openers?
No. Yellow learn button openers use Security+ 2.0 technology and require a different board family.
What should be checked before replacing the board?
Check the original board number, opener model, learn button color, connector layout, wall control wiring, and safety sensor circuit before replacing the logic board.
