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:

[PaKa]

Did the LEDs work when you plugged in the board the first time? Can you send a picture of the board so we can validate the jumper settings? You have updated to the latest board configurator app?

[nicell]

I don't think they worked the first time, but I don't remember for certain. The board configurator app is at 0.5.0, which is latest from what I can tell.

[PaKa]

Looking into this so don't do anything to the board in the meantime.

[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.