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Have I damaged my nRF52832 Dev Kit?

Rick

I have been analyzing the current consumption of my nRF52832 dev kit today using both a multi meter and an oscilloscope with a resistor. I'm not sure what I exactly did that lead to this, but now my board constantly uses 80mA. It can still be programmed and it does seem to run. Did my board get damaged somehow? If so, can it still be fixed?

Edit: What could have happened is that the dev kit was powered for a short time without a jumper on P22 (also no short on SB9 nor resistor on R6). Not sure what this could do to the board.

Edit2: The issue was temporarily fixed by replace the nRF52832 chip on the dev board but now it's back again. Not sure what I'm doing wrong.

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    Neither SB10 or SB11 are shorted. I measure current on P22, sometimes with a multi meter and sometimes with a scope. When using the scope I put a header pin on P22 that has a 10 or 100 ohm resistor between the two pins. That way I don't have to solder/desolder R6 all the time. The chip is functional. Both my own code and the examples work fine and I can connect to it with my phone.

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    Could you upload a close up photo of the board?

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    Here it is

    The area near P22 is a bit dirty but using the continuity function of a multimeter says there is no short.

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    The nRF52832 is classified as ESD HBM class 3A(up-to 4000 V), so it’s very unlikely that ESD from human is the cause. My theory is that the external power supply have caused this with voltage spikes. In order for this not to happen again, I would recommend to cut or de-solder the SB12 bridge( in order to activate/reconnect the voltage protection diode again), and then adjust the power supply to accommodate for the ~0.32V voltage drop that is over the protection diode.

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    Alright I will remove the bridge from SB12. Is there any harm in using the board like this for a few days to further develop my code (beside current optimization)? My colleague doesn't have time to replace the chip right now.

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