DK Boards Not Working

[DataMate]

I have 2 DK boards neither of which is working.

The first is a PCA10040 V1.2.1.  When I plug it into my Window 10 computer with a data cable, Windows says it's an unrecognized device.  I tried uninstalling the driver in Windows Device Manager but that did not fix the problem.  The green LED is flickering.  No matter which computer or USB port I try to plug into, it always behaves the same way.  If I hold the IF BOOT/RESET button down when I slide the power switch to on, the green LED will start blinking, but there is still no USB connection.

The second is a PCA10056 2.0.2.  When I plug in to either USB port on the board and switch the power on, nothing happens, even while holding IF BOOT/RESET down.  No LED's are lit.  If I measure between the 5V and GND pads on the back of the board with a voltmeter I get 5V.  I tried switching between VDD and USB for the nRF power source, but it didn't make a difference either.

Is there a way to restore both of these boards so that I can use them again.  They were both working at one time.  I was using them for power profiling.

Thanks,

Alec

[DataMate]

For the PCA10040, I was able to get the BOOTLOADER drive to appear and follow step 4 at   My nRF52/nRF51 DK kit doesn't work. dragging and dropping the bin file from https://www.nordicsemi.com/Products/Development-hardware/nrf52840-dk/download#infotabs but after powering off and powering back on I still don't see the mass storage drive appear, though the unrecognized device error message doesn't pop up any more.  Just LEDs 1, 2, 3, and 4 are faintly lit. 

For PCA10056, I can see JLink Device in nRF Connect for Desktop Programmer when I plug my JLink probe into the DEBUG IN connector on the board.  Is there a zip file I can drop in to restore functionality so that the board enters mass storage mode when I plug it into the USB port on my PC without the JLink probe connected?

[DataMate]

Found the issue.  Under high magnification I could see that what had been a solder bridge at SB9 had been severed.  I jumpered the pins for the nRF current measurement connector together, and the board now consumes the hex file that I copy to the JLINK drive without any errors.

[tesc]

Hi,

I am happy to hear you that you figured it out! SB9, of all things, that can't have been easy to spot.

Does this mean everything is now in working order?

Regards,
Terje

[tesc]

Hi,

Out of curiosity I checked SB9 on the nRF52840 DK (PCA10056) and it seems to be normally open, related to LEDs, connecting VDD_PER to VDD if closed. Did you mean SB40 or 41, which are both related to power measurement?

Regards,
Terje

[DataMate]

That was on the nRF52832 DK (PCA10040).  Haven't gotten the nRF52840 DK (PCA10056) working yet.

With the nRF52832 DK, I did find a couple of the USB ports on my PC couldn't read the device, while the other 2 could, all presumably on the same hub.  All I can figure was the registry was trashed somehow, but didn't know exactly what the VID & PID were to search through the registry to see if anything was amiss.  What are they for both products?

[tesc]

Hi,

Please try installing the latest version of J-Link Software and Documentation Pack. If it doesn't work, try uninstalling existing versions and reinstall the newest version.

Regards,
Terje