NRF52833 DK not powering up

[chethans]

Hi,

We have 4 NRF52833 DK being used for our development work.

Among that, 3 of them have stopped working and are not powering up.

They power up some times when connected to a power source for a long time, after 30 minutes or so. But this is rare.

Its very frustrating behaviour. We even got a new DK just couple of weeks back and it is also showing the same behaviour.

What could be the reason for this?

Thank you,

Chethan

[Simonr]

Hi Chethan

This sounds very strange. How are you powering these DKs? Are they not powering up if you're connecting it via a USB cable from the computer to the J2 connector on the board either? Have you made any modifications to these boards?

Also, please make sure that all onboard switches are in the correct position. nRF power source should be set to VDD. VEXT->nRF should be set to OFF, TRACE should be set to Def, and nRF ONLY | DEFAULT should be set to DEFAULT.

Best regards,

Simon

[chethans]

Hi Simon,

All the switches are in correct position.

We have not done any modifications to the boards.

Its a very strange problem indeed, I have not faced anything like this with previous NRF51 and NRF52 boards.

We are seeing the behaviour of dev kit powering up after keeping it connected to a power source for ~30 mins consistent across all boards. Sometimes they make a high frequency sound (barely audible) after powering up.

Thank you,

Chethan