Hello,
my nRF9151 DK appears to be damaged or has a power-path failure.
Current symptoms:
- No LEDs light up
- No J-Link is detected
- No COM port appears
- No mass storage device appears
- Windows does not show a usable device anymore
What happened before:
- I used nRF Connect for Desktop Quick Start on the board
- At that time, a W5500 Arduino evaluation board was attached
- After the issue appeared, I removed all external hardware and tested only with a minimal setup
Current test conditions:
- Minimal setup only
- No external peripherals attached
- No SIM
- No jumper wires
- Different USB cable tested
- Different direct USB port tested
- No VM involved during these checks
Visual/mechanical checks:
- USB-C connector looks fine
- No visible damage
- No burn marks
- Nothing gets warm
- P22 area unchanged
Measured voltages with USB connected:
- 5V = 4.9 V
- VDD_nRF = 4.9 V
- VDD_5V = 4.9 V
- VDD_GPIO = 0.6 V
- VDD = 0.6 V
Measured resistance with USB disconnected:
- VDD_GPIO to GND: >14 kOhm
- VDD to GND: >1 MOhm
Additional context:
Earlier, Quick Start still detected the nRF9151 DK. In the log, it selected the board, later opened COM16 at 115200 baud, and even found a shell prompt mosh:~$, so the target was still alive at that point.
The same log also shows that Quick Start reached the Verify/SIM/Evaluate/Learn/Develop/Apps/Finish stages after talking to the device over COM16. I also noticed earlier USB enumeration-related messages in the log, and the setup used SEGGER J-Link V9.38a. A later log again shows J-Link V9.38a in use.
At this point, however, the board is no longer detected at all, and the low VDD/VDD_GPIO rails remain.
Does this look like a hardware failure in the power-management / regulator path of the DK, and should the board be replaced / RMA’d?
Thank you.
