LiftMaster K001D8439-MC CAPXL Power / Internet Board
LiftMaster K001D8439-MC CAPXL Power / Internet Board
The LiftMaster K001D8439-MC is a replacement power / internet board for the applicable CAPXL / CAPXLV access-control portal revision. The offered reference is K001D8439MC; base reference K001D8439. It is an internal service component, not a complete intercom or a universal board for the CAP family. Match the original label and the portal’s parts documentation before ordering. A failed visitor call, blank screen or offline portal can involve several components, so identify the actual fault before replacing this board.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| CAPXL / CAPXLV documented base board | Manufacturer repair lists identify K001D8439; confirm the offered MC revision for the installed unit. |
| K41-0112-000 control board | A separate component with a different service function. |
| K002A1978 external power supply | Separate from the internal power / internet board; diagnose the supply before replacing portal electronics. |
| CAPXLV2 and other CAP models | No cross-generation fit established. |
Identify the Board’s Function Before Choosing the Repair
This board is identified for power and internet functions within the portal. It should not be confused with the main control board, a door-interface board or the external power supply. An apparent loss of portal power or networking needs a systematic check of those separate elements. Confirm the complete part reference rather than choosing by board color or a similar connector arrangement.
Record the existing portal model, original board reference and observed fault. The access-control system also depends on its power supply, network, field wiring and configured services. A replacement board does not itself renew a subscription, restore a failed internet connection or repair an external lock. Have the technician check the system and preserve the information needed to restore operation after service.
Specifications and Product Identification
| Specification | Details |
|---|---|
| Supplier SKU | K001D8439-MC |
| Service reference | K001D8439MC; base reference K001D8439 |
| Component | power / internet board |
| Equipment category | CAPXL / CAPXLV access-control portals |
| Selection requirement | Exact portal generation, board label and approved service replacement |
| Not established | Compatibility with CAPXS, CAPXM or CAPXLV2 |
Before Ordering
- Photograph the portal label and the complete original board number.
- Confirm the approved replacement for the hardware generation.
- Have power, connections and the relevant network or field wiring inspected.
- Plan configuration recovery and testing of every controlled entrance.
Package Contents and Separate Requirements
This listing identifies the named board service item. A touchscreen, faceplate, camera, door-control board, external power supply, lock or complete wiring harness is not promised as included. Confirm the supplied revision and carton contents before ordering. An exploded diagram can show several boards in one cabinet without making them one replacement package.
Safety Warnings — Read Before Installation or Service
- WARNING: Access-control service can affect door release and gate movement. Use a qualified access-control professional and maintain a safe access arrangement during the repair.
- Isolate the relevant power sources before handling boards or changing connections. Follow the manufacturer’s static-handling and wiring instructions.
- Do not bypass locks, egress functions or gate-protection devices to conceal an unresolved fault.
- After service, test portal communication, authorized release and the controlled openings’ independent safety functions before normal use.
Related Products and Important Differences
- KPW250 wireless keypad — a different access method for compatible gate operators; it is not a replacement board or guaranteed backup for a CAPXL portal.
- LMRRUL monitored photo eye — a separate protection device for approved gate operators; portal electronics do not replace its safety function.
Frequently Asked Questions
Is this the main control board?
No. The parts list identifies the control board separately as K41-0112-000 in the applicable revision.
Why does the manual show K001D8439 without MC?
The manual uses the base reference. The supplier offers K001D8439MC; confirm its approved replacement relationship with the actual installed revision.
Will the board alone fix an offline portal?
Not necessarily. The supply, network, wiring, configuration and service account also require diagnosis.
Are all CAP-family boards interchangeable?
No. Match the exact portal generation and service reference. CAPXS, CAPXM and CAPXLV2 are not established as compatible here.
Need Help Confirming the Right Product?
Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.
Details
Need Help With Compatibility?
Not sure if this is the correct part for your garage door, operator, gate system, or application? Contact Us before ordering — we’re happy to help.
Garage-DoorParts.com carries a large selection of residential and commercial parts, and many components can look similar while having important differences in dimensions, model numbers, voltage, mounting, or compatibility.
For the best assistance, please provide as much information as possible, including the manufacturer, model number, part number, door or operator type, dimensions, and clear photos of the existing part or equipment.
Our goal is to help you identify the correct product before you order and reduce the possibility of ordering an incompatible part.
Contact Us with your product questions and compatibility information, and we’ll do our best to point you in the right direction.
Shipping & Returns
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