Liftmaster K001D8439 -Power/Internet Board, CAPXL

LiftMaster K001D8439 Power and Internet Board for CAPXL and CAPXLV Product Overview

The K001D8439 power/internet board is an internal service board for LiftMaster CAPXL and CAPXLV connected access systems. It supports the access station electronics where power handling and internet/network board functions are part of the service assembly. In the field, a customer may be chasing symptoms such as communication loss, power-related faults, network failure, or intermittent access system behavior, but those symptoms can also come from the power supply, wiring, surge damage, router/network equipment, cellular gateway, or another internal board. This is why the exact board part number and connector arrangement should be matched before ordering. Replacing the wrong CAPXL board can create additional downtime on a community entry system.

Features and Specifications

Compatible With

• LiftMaster CAPXL high-capacity connected access system
• LiftMaster CAPXLV high-capacity connected access system with video
• Select CAPXL/CAPXLV service applications requiring the K001D8439 power/internet board
• Access control installations using compatible CAPXL/CAPXLV connected access hardware

Also Known As / Related Part Numbers

• K001D8439
• 001D8439
• K001D8439MC
• LiftMaster CAPXL power/internet board
• LiftMaster CAPXLV power/internet board
• CAPXL power internet board

Technician Note

Do not replace this board solely because the entry system is offline. Check incoming power, low-voltage supply, surge protection, network cabling, router/switch connection, and water damage first.

Before Ordering Checklist

• Confirm the access system model is CAPXL or CAPXLV.
• Match the installed board number to K001D8439 or a confirmed related suffix.
• Compare connector locations and harness count before removal.
• Check for surge, corrosion, moisture, or burned traces.
• Record network and access system settings before service when possible.

Important Ordering Warnings

This part is not a universal CAPXL main board and should not be treated as interchangeable with display boards, controller boards, CAPXS boards, or IPAC peripheral boards.

Professional Advisory

For access control systems serving a community, commercial property, or secured entry, board and low-voltage component replacement should be handled with the power disconnected and the wiring documented before removal. If there are damaged conductors, water intrusion, burned traces, or unreliable gate/door movement after replacement, have the system checked by a qualified access control technician.

Product Questions and Answers

What does the K001D8439 board do?

It is an internal CAPXL/CAPXLV service board associated with power and internet/network board functions.

Is K001D8439 the complete CAPXL controller?

No. It is one internal board and should not be confused with every other board inside the access system.

Can network problems be caused by something other than this board?

Yes. Router settings, cabling, cellular equipment, power issues, and surge damage can all cause communication problems.

What should be matched before ordering?

Match the access system model, board number, connector layout, and parts diagram.

Is K001D8439 used on IPAC systems?

No confirmed support was found for IPAC. It is associated with CAPXL and CAPXLV service applications.