https://devzone.nordicsemi.com/f/nordic-q-a/85403/nrf9160-dk---doesn-t-power-after-external-supplyHello, I tried to power the nrf9160-DK with external supply on port P21, as suggered : https://infocenter.nordicsemi.com/pdf/nRF9160_DK_HW_User_Guide_v1.0.pdf So I put a li-ion cell directly (which was charged at 4.1V) to try the asset_trackeren-USTelligent Community 13Fri, 04 Mar 2022 13:03:34 GMThttps://devzone.nordicsemi.com/thread/356304?ContentTypeID=1Fri, 04 Mar 2022 13:03:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8e865e5-bfb0-4a50-85ed-0ad527b37d84JONATHAN LL[quote user="PierreLesc"]So I think I burnt something due to high voltage power in.[/quote] <p>That&#39;s a bummer if that is the case. I can try to figure out what went wrong if you want to, there are som alterative ways to power the DK, some only powering the SiP, and not the on board MCU\Debugger chip.<br /><br /><br /><a href="https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/hw_power_supply.html?cp=2_0_4_3_2">https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/hw_power_supply.html?cp=2_0_4_3_2</a>&nbsp;<br /><br />Some solder bridges can be cut\shorted to achieve different configurations.&nbsp;<br /><a href="https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/solder_bridge_configuration.html?cp=2_0_4_3_16">https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/solder_bridge_configuration.html?cp=2_0_4_3_16</a>&nbsp;<br /><br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/356191?ContentTypeID=1Fri, 04 Mar 2022 08:05:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab8d1d32-f088-435d-bbcb-d00b243cbd00PierreLesc<p>Ok, after checking everything, I use a charger li-ion during a test, and unplug the battery before the charger, this could (for sure) have sent a pic voltage on the external supply.</p> <p>So I think I burnt something due to high voltage power in.</p><div style="clear:both;"></div>