No LTE connection

[Vojislav]

I have developed a new board based around NRF91 module. Ten prototypes are produced and six of them work. Other four devices cannot connect to the LTE network. I am using the at_client example with nRFconnect v3.0.0 LTE link monitor, and the device is always searching, but cannot find the network. 

Here is the picture of the link monitor window and current consumption while searching for the network. 
I know this is most likely a soldering issue, but I have resoldered antenna part many times and still nothing... Do you have any suggestion about what could be a problem?

[Martin Lesund]

Hi Voja,

I have a suspicion that this can be related to your 'nrfjprog' version. 
We have seen that if you are not using the latest 10.2.1 version there can appear issues similar to this when flashing.

Please update the nrfjprog to the latest, and then make sure to delete everything from the application side 'nrfjprog -e' before you re-flash the application.

You are highly recommended to update to mfw v1.0.0 as well. (since you cannot go into production with an older modem firmware)

Best regards,
Martin L.

[slomusti]

Hi Martin, I have tested this with Voja, using the latest nrfjprog 10.2.1 and Jlink 6.44e and the problem persists. As outlined in the other issues, we ahve nto yet upgraded the modem firmware as we can not run code with the new firmware on our custom boards of an yet unknown reason, however we have a few working with this one.

[Vojislav]

Hi Martin,

We have managed to get rest of the boards working after resoldering them a few times. Also, we put the new version fo the firmware on them, and they work with application firmware.

Best regards,
Voja