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  • Case ID: 362100
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nRF52-DK Non-responsive

Emlyn

I have been using a NRF52-DK board to develop a BTle solution for the past week.
Today, midway through a debug session, the board vanished from my BT interfaces.

It also no longer shows up on USB when plugged in, neither directly or when attempting to put into DFU mode (holding the reset button down and powering on over USB).

Is there something in software I can do, or is this a hardware fault somewhere?

LED5 is not on.

Nothign is seen on USB.

  • 0 in reply to Emlyn
    Hello Emlyn,
    Thank you for the picture of the kit. It's not a common issue, but with the number of kits we do have in the market, sometimes things do go wrong. Unfortunately it can come down to board switches set incorrectly (hence the picture request), often it is related to USB port and cable along with non-windows environment. Some then try to peel of the sticker and re-program the On Board Debugger. As indicated by Paal below here as well.
    • Did you try to reprogram the ODB on the kit through the JTAG header under the sticker?
    • The behaviour you're describing does indicate that the FW on the nRF5340 ODB has been changed and this isn't something we have a clear path understand on how it could be. What sort of OS environment are you working with? What versions of Segger SW and tools are you using?
    Best regards
    Asbjørn
  • 0 in reply to Asbjørn

    Hello Asbjørn,

    No, I did not try to reprogram the ODB. I don't have a J-Link other than this broken board.
    My questions down this path were whether it could be recovered this way though another J-link, but that seems not to be the case.

    I was running a BTle app on the application processor, using softdevice 132. 
    RTT viewer 9.62
    nRF Connect Desktop 5.3.2, programmer 4.8.0
    Windows 11, 64 bit

  • 0 in reply to Emlyn

    Hi Emlyn, 

    I should have asked you in a previous reply, but what are you measuring on the VBUS input to the ODB nRF5340? 

    See the red arrow for the location of the R9, C35 and C36 cap on the VBUS input. When the cable and everything is plugged in, what voltage are you measuring there on these three components?

    Best regards

    Asbjørn

  • 0 in reply to Emlyn

    Hi there, 

    So in the devices view in NRF_SDK in VB, there is a " RECOVER BOARD" Did you try that First ?

    It can happen that some code or issue can corrupt the board , Clicking recover will return it to normal.

    DO you know where that option is ?

    HTH

    GL :-) PJ:v:

  • 0 in reply to Asbjørn

    5.18V on the bottom pads of the two left most components (R/C) and 0V on the bottom of the right component of the three (the other cap).

    Resistor is measuring 2ohms, 
    Top pads of the two caps measure zero 

    So:

    5.18     0       0
       |        |        |

    5.18   5.18    0

    A full schematic would be helpful to diagnose.
    The P1 VDDs have 3v reading

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