Sears Craftsman 139.3043 Receiver Logic Circuit Board
The Sears Craftsman 139.3043 / LiftMaster 45DCT receiver logic circuit board is a Security+ 2.0 service board for select DC chain and belt drive garage door openers with a yellow learn button. Unlike the older purple learn button 315 MHz boards, this board belongs to the later tri-band Security+ 2.0 platform used on many post-2011 LiftMaster, Chamberlain, and Sears Craftsman openers.
The 45DCT board manages the opener logic, radio receiver, accessory learning, travel setup functions, and supported MyQ or AssureLink communication features depending on the opener model. Because there are several 45-series and 41D-series yellow learn button boards, the original board part number and opener parts diagram should be checked before ordering. A board from the wrong HP, drive, or firmware family may look similar but still be incorrect.
Compatible With
Compatible with select Security+ 2.0 yellow learn button DC chain and belt drive LiftMaster, Chamberlain, and Sears Craftsman openers where the 045DCT / 45DCT board is specified.
- Sears Craftsman 139.3043 receiver logic board applications where 45DCT is the specified replacement
- Select LiftMaster and Chamberlain DC chain drive openers manufactured after 2011 that call for 045DCT
- Select LiftMaster and Chamberlain DC belt drive openers manufactured after 2011 that call for 045DCT
- Commonly searched model families include 8360, 8550, HD920EV, LW5000EV, WD962KEV, WD962KPEV, and WD962MLEV where the parts diagram matches
- Security+ 2.0 yellow learn button accessories such as 891LM, 893LM, 877LM, and compatible MyQ/AssureLink accessories where supported
- Not compatible with older 315 MHz purple learn button boards, 390 MHz red/orange boards, green learn button boards, or AC-only 41AB/41AC/41AS board families
Also Known As / Related Part Numbers
- 045DCT
- 45DCT
- 041D7356
- 41D7356
- 1D7356
- 04D11741
- 139.3043
- Sears Craftsman 139.3043
- Security+ 2.0 receiver logic board
- Yellow learn button board
- 891LM compatible remote reference
- 893LM compatible remote reference
- 877LM compatible keypad reference
Features & Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
| Product Type | Receiver logic board |
| Sears / Craftsman Reference | 139.3043 |
| LiftMaster Service Part | 045DCT / 45DCT |
| Application | Receiver logic board replacement for select DC chain and belt drive Security+ 2.0 openers |
| Drive Type | DC chain and belt drive |
| Motor / Power Family | DC residential garage door opener |
| Security Technology | Security+ 2.0 |
| Radio Frequency | Tri-band Security+ 2.0 family, commonly 310/315/390 MHz |
| Learn Button Color | Yellow |
| Production Range | Select post-2011 openers |
| Compatible Accessories | Security+ 2.0 remotes and keypads such as 891LM, 893LM, 877LM, and compatible MyQ/AssureLink accessories where supported |
| Notes | Yellow learn button Security+ 2.0 board family; not compatible with older purple, red/orange, or green learn button systems. |
Common Replacement Reasons
- Garage door opener has power but will not respond correctly to remotes, keypad, or wall control after other basic issues have been ruled out.
- The radio receiver section will not learn compatible remotes or drops programmed accessories after reset.
- Visible board damage, burnt components, lightning surge damage, or corrosion is found on the original board.
- The motor, safety sensor, and wall-control circuits have been checked and the parts diagram calls for this receiver logic board family.
- A previous board was replaced with the wrong frequency or wrong learn-button generation and the accessories no longer match.
Technician Note
This is a yellow learn button Security+ 2.0 DC opener board family. Do not use it to replace older purple learn button 315 MHz boards, even if the opener is also a Craftsman, Chamberlain, or LiftMaster product.
Before Ordering Checklist
- Match the original board label and parts diagram to 045DCT / 45DCT before ordering.
- Confirm the opener has a yellow learn button and belongs to the Security+ 2.0 platform.
- Confirm the opener is a compatible DC chain or DC belt drive model; do not assume fitment on AC-only operators.
- Plan to reprogram remotes, wireless keypads, vehicle transmitters, and MyQ/AssureLink functions where applicable after board replacement.
- Disconnect power before service and complete travel, force, and safety reversal testing after installation.
Professional Advisory
Receiver logic board replacement affects the opener controls, radio memory, travel/force setup, and safety input behavior. Do not bypass photo eyes or safety circuits to make a board work. If the opener has erratic movement, damaged wiring, or repeated board failures, have the door balance, power supply, sensor wiring, and surge exposure checked by a qualified garage door technician.
Product Questions & Answers
Is 45DCT the same as 045DCT?
Yes. 45DCT and 045DCT are commonly used as dashed/no-leading-zero references for the same LiftMaster Security+ 2.0 receiver logic board family.
Does this replace Sears Craftsman 139.3043?
This listing is written around the Sears Craftsman 139.3043 application where the LiftMaster 45DCT board is the correct service replacement.
What learn button color should the opener have?
This board family is for yellow learn button Security+ 2.0 openers, not purple, red/orange, or green learn button systems.
What remotes are commonly compatible?
Compatible Security+ 2.0 accessories commonly include 891LM, 893LM, and 877LM style devices where supported by the opener model.
Can this replace 41AB, 41AC, 41DB, or 41AS boards?
No. Those are older 315 MHz purple learn button board families and are not interchangeable with the 45DCT Security+ 2.0 platform.
