https://devzone.nordicsemi.com/f/nordic-q-a/46879/providing-external-power-supply-to-nrf52832Hello, I&#39;m developing a home automation related product using mesh. For testing mesh functionality I&#39;m placing the DK in different rooms and testing the range. As a power supply I&#39;m connecting a USB power bank that has 5V out. When I connect the poweren-USTelligent Community 13Mon, 18 Jun 2018 23:31:04 GMThttps://devzone.nordicsemi.com/thread/185003?ContentTypeID=1Mon, 18 Jun 2018 23:31:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:39f2e891-2f4a-4486-8640-6f23c870476fSunil519<p>Thank you for answering my questions</p> <p>&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/185002?ContentTypeID=1Mon, 18 Jun 2018 23:28:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0b104da4-7af2-416a-bd16-e88e2922d389Jeff4BLE<p>When I connect the power bank to the board, the LD5 blinks fast. What might be the reason for it?</p> <p>It indicates the debug interface MCU is powered but not connected to a host. This happens under the condition describes or if the debug interface MCU&#39;s firmware becomes corrupted, or the USB cable connected the host is bad and does not support data.</p> <p>Does powering the DK using power bank damage the board?</p> <p>No</p> <p>If SB29 is cut this will remove all power from the debug interface IC. The advantage is the battery will last longer. The disadvantage SB29 will need to be connected in order to use the DK&#39;s debugger interface.&nbsp;</p> <p>Best regards,</p> <p>Jeff</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p><div style="clear:both;"></div>