https://devzone.nordicsemi.com/f/nordic-q-a/64307/nrf52-dk-faulting-with-external-3v-supply-twiceI&#39;ve a prototype board which I need to externally program. The prototype board supplies it&#39;s own 3v supply to the chip (working fine) via a 5v supply which is current limited to no more than 100mA. The nRF52-DK is powered by USB. I blew one yesterdayen-USTelligent Community 13Thu, 30 Jul 2020 12:29:33 GMThttps://devzone.nordicsemi.com/thread/262402?ContentTypeID=1Thu, 30 Jul 2020 12:29:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:35c109b3-bc74-4658-8400-02bd4495a579snoopy20<p>Actually the external pins on this are damaged. Third board is working well!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/262158?ContentTypeID=1Wed, 29 Jul 2020 10:43:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d5bfc40c-f829-4886-b08c-de0a444121besnoopy20<p>I left the second DK for a while and went back to it. LED5 slowly ramped up and eventually the other LED&#39;s come on and the board is back to normal. Now it works fine on each plug/unplug. I suspect a chip was partially damaged but not enough as per the first board which is dead (and heating up).<br /><br /><br /><br /><br /><br /><br /></p><div style="clear:both;"></div>