Not able to flash Thingy91x: nrf5340

[VinayKotadamakki]

Hello Team,

I am not able to flash any firmware to nRF5340 which is available in Thing 91x.

I had tried peripheral_lbs example which was working fine. When I tried to reflash it with standard connectivity bridge application, 

it got stuck and I had tried multiple restarts and even tried multiple flashing. SWD Switch is changed to nRF53 still I am not able to flash any firmware to it.

Even I am not able to re flash peripheral_lbs example. Need your support. I am doubting I may have bricked it.

Thanks and regards,

Vinay

[VinayKotadamakki]

Hi Jonathan,

As I have previously said, I have 2 Thingy 91x boards and I am able to flash one more 
thingy 91x using Jlink Ultra plus using SWD connections and it doesnt give any issues.

But this one board is not providing or able to flash any image or firmware using SWD interface or others.

And when I connect Jlink ultra plus debugger it only shows 1 led and if I power on Thingy 91x, 2 led will be glowing in Jlink ultra plus. So I believe SWD power is available.

Kindly please let me know any other issue is causing this problem.

Thanks and regards,

Vinay

[JONATHAN LL]

Hi Vinay,

VinayKotadamakki said:

have 2 Thingy 91x boards and I am able to flash one more 
thingy 91x using Jlink Ultra plus using SWD

Thanks for the extra explanation, i did not catch that you had tested on multiple different Thingy devices. 

What voltage do you measure on TP 2 and 3 ? 

https://docs.nordicsemi.com/bundle/ug_thingy91x/page/UG/thingy91x/hw_description/test_points.html 

It could be that the device is damaged in some way, but difficult to say exactly what.

Regards,
Jonathan

[VinayKotadamakki]

Hi Jonathan,

I have measured voltage. 

TP2 - 1.742v

TP3 - 4.130v

Is this measurements right?

Thanks and regards,

Vinay

[JONATHAN LL]

Values looks ok. So it seems that the nRF91 and nRF53 is powered correctly at least.

I am curious if the SWD switch is the issue, do you have the option to probe or connect to some other points on the board? 

You can probe the SWD lines on TP29 and TP 27 to see if there is any activity there. 


If there not much going on there then R4 and R6 can be probed, these are closer to the nRF5340 after the switch. 




Its not a design that is easy to probe as most of the traces and components are small and not named on the silkscreen so I understand if that is not a viable solution. So if you are not able to get it working the normal way and the device is unresponsive over SWD then there could be a issue with one of the switches or power\logic that drives these functions. If you are able to contact your supplier where you got the device from they might be able to issue a replacement for you. 

Regards,
Jonathan