nRF52840 DK suddenly STOPED working.

RE: nRF52840 DK suddenly STOPED working.

Simonr — Mon, 16 Dec 2019 11:42:45 GMT

Have you cut any other solder bridges than the SB40? Could you check that the jumper on P22 is working properly?

Best regards,

Simon

RE: nRF52840 DK suddenly STOPED working.

SKV — Mon, 16 Dec 2019 05:58:32 GMT

Hi,

The firmware flashed to the board was 802_15_4 (wireless_uart).

->I tried using nrfjprog -- recover it did not work.

->LED5 turns ON only when connected to the external power supply.

I reapplied the MCU firmware, it did not hlep.

Its OK i can manage with external power supply, but i have to carry the power when i am test different location.

RE: nRF52840 DK suddenly STOPED working.

Simonr — Mon, 09 Dec 2019 13:36:38 GMT

A few more questions from my side:

What firmware was flashed onto the board when it stopped working? Are you able to recover it by using nrfjprog --recover in the command line (you'll need to download the nRF command-line tool first for this to work)?
Is the debugger LED (LED5) still on when you power it through J2?

You can also try to re-apply the Interface MCU firmware to the debugger chip on your DK, as described in this case.

Best regards,

Simon

RE: nRF52840 DK suddenly STOPED working.

SKV — Mon, 09 Dec 2019 09:57:17 GMT

Yes i have cut the S40 solder bridge for measuring the power and i have put a jumper to it. I was conducting an experiment on TiSCh for 802.15.4. This board was used as a receiver.

Thanks in advance.

RE: nRF52840 DK suddenly STOPED working.

Simonr — Mon, 09 Dec 2019 06:31:11 GMT

Have you cut any of the solder bridges on your DK? Please upload a hi-resolution picture of your DK so I can take a look. Can you tell me more about what experiment you were testing when the board stopped working?

Best regards,

Simon

RE: nRF52840 DK suddenly STOPED working.

SKV — Mon, 09 Dec 2019 04:34:20 GMT

Thanks for replying. The nRF power source switch is in the VDD position only. Any other method to solve the issue.

Thanks in advance.

RE: nRF52840 DK suddenly STOPED working.

Simonr — Fri, 06 Dec 2019 11:27:16 GMT

Can you check what position you have put the nRF power source switch (SW9) is in? It should be in VDD (middle position) in order to run normally.

Best regards,

Simon