nRF52840 DK LED5 is not glowing SW9 is on VDD mode and the PC doesn't Detect the board

[Sarkar]

Hi Support Team,

1. I have a problem with nrf52840 DK board, it was not detecting in nRF Connect SDK for DEsktop.

2. Previously it was working but now it is not working, I could not find the issue.

3. The LED5 is not blinking but while I change the SW9 from VDD to Li-Po mode the LED5 blinks for some times.

4. I checked the USB Cable with other nRF boards I have and they are working.

5. Then I followed this post nRF5340 DK LED5 is bright SW9 is on VDD mode and the PC doesn't Detect the board not working

and checked the VDD nrf and gnd pin and the voltage was 0V but when I check other pins like the 5V pin or normal Vdd pins they are working fine.

Then I also checked the micro usb cables pins and there I found 5V with respect to ground.

Please suggest some solution for this.

Thanks You.

Regards,
Sadasiba

[Brian]

Our nRF52840DK was working fine yesterday, but when I powered it up today, I can tell it is still running the firmware I flashed yesterday, but LED5 does not come on and none of our computers can detect the device. (I have tried 3 usb cables, all of which work with our nRF52832DK.). This is very frustrating and honestly I'm beginning to wonder if we made a mistake by selecting Nordic SOCs.

[Kenneth]

Hello,

That is unfortunate, we don't see many of these issues. Do you have a second nRF52840-DK you can use for comparison? Also in addition to the mentioned debug steps, you can also just double check that all switches are in the same configuration as previously. 

Kenneth

[Brian]

Hi Kenneth,

Yes, I tried all of the troubleshooting suggestions made here and elsewhere. (My board’s switches and jumpers remained unaltered from the factory state until after it failed.) 

It seems the Segger half of the board has failed since the nrf52840 is still running our firmware, It is just infuriating that the failure has halted all progress.

FYI, I ordered a new DK from DigiKey, so we should be able to resume testing in a few days,

I can send you the failed board for further analysis.

Thank you!

[Kenneth]

Which board version is it?

Kenneth

[Brian]

PCA10056 V1.1.0

[Kenneth]

Hi,

That board should still work, but it is also a really old board, so it might just have seen enough battles for it to eventually be worn out so to say (e.g. EOS damage and/or repeated handling) so I suggest to get a new one.

Kenneth

[Brian]

As I said before I already ordered a new one, but I just bought the defective one as “new old stock” about 6 months ago, and since the board looks pristine I’m going to assume it was not used before I acquired it. Which brings us back to my earlier question… Can I send it to Nordic for further analysis?