nRF54LM20-DK no LED power

[nicell]

It seems like the nRF54LM20-DK is not properly powering LED 0-3. After measuring 0V from TP1 to GND, I opened the board configurator and tried applying "ledcontrol" as both off and on, and either way I'm getting no power. Any insight here would be appreciated!

PCA10184

DK Hardware Revision: 0.3.4

Board Controller FW version: 1.2.1

# nRFConnect System Report - 2025-10-19T21-06-18.849Z

- App: Board Configurator
- Version: 0.5.0
- Source: official
- Core version: 5.2.0
- Engine version: >=5.2.0
- System: Apple Inc. MacBookPro18,1
- BIOS: Apple Inc. 13822.1.2
- CPU: 1 x Apple M1 Pro 2.4 GHz 10 cores (10 physical)
- Memory: 73.2 MB free of 16 GB total
- Filesystem: /dev/disk3s1s1 (APFS) 460.4 GB 19.6% used

- OS: macOS (26.0) darwin arm64

- Versions
- kernel: 25.0.0
- git: 2.39.5
- node:
- python:
- python3: 3.9.6
- nrfutil-nrfutil-device: 2.12.3
- Connected devices:
- 001051856418 PCA10184: /dev/tty.usbmodem0010518564181, /dev/tty.usbmodem0010518564183

- Current device:
- name: nRF54LM20 DK
- serialNumber: 001051856418
- cores: 1
- website:

[cheeric]

I also ran into this issue with my nRF54LM20 DK rev 0.3.4.

I believe the reason the LEDs are not getting 5V power is because the nPM1300 default VDDIO (nPM VOUT1) and VDD_DRBG (nPM VOUT2) is configured to 3000mV by default out of the box:

Because nPM1300's VDDIO uses this VDD:nRF_PMIC voltage, the LED_PWR_CTRL (which is ~1.8V) from the debugger MCU is not able to assert HI and turn on the load switch output LSOUT2.

If I change the VDDIO (nPM VOUT1) and VDD_DRBG (nPM VOUT2) configuration to 1800mV or any value that satisfies , then the LSOUT2 turns on, P5V0:LED gets voltage, and LEDs turn on.

[nicell]

This was exactly it! Thanks for the reply and explanation.

[meemoo]

I was following along with the DevAcademy Connect SDK Fundamentals course with the blinky example and was completely stumped. My board is rev 0.3.4 as well. How do you reach this configuration ui to change VOUT1 and VOUT2? I have only been exposed to the official Connect SDK VS Code extensions so far. Thanks in advance.

[meemoo]

Nevermind, resolved. Google image searched, it is the Board Configurator within nRF Connect for Desktop.