https://devzone.nordicsemi.com/f/nordic-q-a/47472/leds-not-functioning-after-using-external-li-po-batteryHi all, I purchase a Li-Po batter where it will output 4.2V when I connected to nrf52480 DK, it causes all 4 LEDs (LED1, LED2, LED3, LED4) not functioning anymore. The Li-Po battery connected to battery connectors P27, please refer to the doc linken-USTelligent Community 13Sat, 25 May 2019 03:04:09 GMThttps://devzone.nordicsemi.com/thread/189122?ContentTypeID=1Sat, 25 May 2019 03:04:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b0ab94e3-68b4-40df-959b-7247898b73e1kokheng<p>Hi Ketiljo,</p> <p>IC SC728 (location: U4) is missing on my board, you can refer below picture&nbsp;&nbsp;</p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/IMG_5F00_20190519_5F00_161846.jpg" /></p> <p>and Nordic doc show it connected to 4 LEDs, it this the reason why the LEDs can&#39;t work? do you have any workaround to resolve this issue?</p> <p>I believe the&nbsp;<span>IC SC728C just stripped out from PCB without any reason because this board was fine previously. Not sure what I did to make it like that.&nbsp;</span></p> <p><a href="https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/nrf52840_DK/hw_buttons_leds.html">https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/nrf52840_DK/hw_buttons_leds.html</a></p> <p></p> <h1 class="name hierarchy-component"></h1><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/188527?ContentTypeID=1Wed, 22 May 2019 11:27:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8e067af4-7e07-4287-8435-a92ec4bd9f30ketiljo<p>Do you measure any voltage on either side of <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf52840_dk%2FUG%2Fnrf52840_DK%2Fpower_source.html">SB9</a>?</p><div style="clear:both;"></div>