https://devzone.nordicsemi.com/f/nordic-q-a/96492/why-the-32mhz-crystal-for-nrf52840-failsHello, Our product uses nRF52840 and roughly 2 of 1000 has problem with 32MHz crystal. - Firmware always stuck at following code: (when USB connector is plugged) - The two products worked well before it is sold, since we have USB communicationen-USTelligent Community 13Thu, 09 Mar 2023 11:47:31 GMThttps://devzone.nordicsemi.com/thread/414354?ContentTypeID=1Thu, 09 Mar 2023 11:47:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3d7dfa4a-587a-4acf-8092-bf5b5c47c186Kazi Afroza Sultana<p>I have asked to our expert. We suspect&nbsp;<span><span dir="ltr">PCB has a short. You replaced both the nRF52840 and the crystal and it still doesn&#39;t work. Or some other component around the device.</span></span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/413699?ContentTypeID=1Tue, 07 Mar 2023 06:24:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:561878cf-e384-4fc5-aa3a-6eca8e423413irarykim<p>I tried to reflow the chip, still the same.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/411953?ContentTypeID=1Fri, 24 Feb 2023 12:12:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cb351c00-556c-49ec-823b-7a6d20dd1809Kazi Afroza Sultana<p>You can reflow the chip. May be XC1 and XC2 pins on the chip are not properly soldered to the board.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/411922?ContentTypeID=1Fri, 24 Feb 2023 10:49:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b1a888a9-47ff-4c40-a6f4-f4bba9a034e1irarykim<p>Then it seems that XC1,XC2 are not working. What can cause this?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/411916?ContentTypeID=1Fri, 24 Feb 2023 10:34:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9bee4740-fb15-4c4f-a6f4-2e42c5cf0623Kazi Afroza Sultana<p>Yes. it should be fine with the crystal.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/411238?ContentTypeID=1Wed, 22 Feb 2023 06:33:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1bed2734-7260-4748-8e37-b70f0234bf38irarykim<p>Hello Kazi,</p> <p></p> <p>I took crystal of the PBA (which I didn&#39;t change nRF52840) and soldered this crystal to another normal PBA.&nbsp;</p> <p>This crystal generates good sine wave in this normal PBA.</p> <p>So it means the crystal is fine and the nRF52840 of the abnormal PBA, isn&#39;t it?</p> <p></p> <p>Thank you</p> <p></p> <p>Jason</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/409604?ContentTypeID=1Mon, 13 Feb 2023 13:22:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ac6b19df-a6b8-4b0e-bff3-040e884b5a34Kazi Afroza Sultana<p>Hello Jason,</p> <p>Out of specification will not break the XC1 and XC2 pin.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/409451?ContentTypeID=1Sun, 12 Feb 2023 08:02:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0014c3a1-37f2-46f6-9d79-6b4fc3d1f528irarykim<p>Hello Kazi,</p> <p></p> <p>I replaced crystals for more than 5 times.. And finally I replaced nRF52840 too. But Still not working..</p> <p>Maybe it is impossible to find out the reason for that board since all related components are changed.</p> <p>I wish to know theoretical reason. For example, my crystal is out of spec and it caused nRF52840&#39;s XC1, XC2 pins broken.</p> <p></p> <p>Thank you</p> <p></p> <p>Jason</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/409204?ContentTypeID=1Thu, 09 Feb 2023 14:52:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d25e01f-a754-4567-b08c-b9b150beafe0Kazi Afroza Sultana<p>Hello Jason,</p> <p>It could be chip solder issue. You can try reflowing the crystal and the chip to see if there is any improvement?</p> <p>Thanks.</p> <p>BR</p> <p>Kazi</p><div style="clear:both;"></div>