nRF52 DK board stopped working and does not power up anymore

[AimHigh]

Hi,

It all happened today after being used the board for a month. when I tried to turn on the board it does not blink LED5 nor does it show up in the device manager. I to find info online with no success. I am in deep trouble now, need some quick suggestions, please help me with this.

[Amanda Hsieh]

Hi, 

Please try/confirm and reply regarding to this post. 

Best regards,

Amanda

[AimHigh]

Hello, thanks for the reply. I followed some of the methods from the trailing post.

4. Have you tried to press the IF BOOT/RESET button while power cycling the kit? It should then show up as a Removable Storage Device named "BOOTLOADER". Then you can drag-and-drop the J-LINK interface MCU firmware found here (v170724) onto the storage device to reprogram the JLINK firmware.

This seems to give me some hope, but now LED5 is only flashing continuously for every second. 

And in device manager, it says unknown device. What shall I do now?

[Amanda Hsieh]

Please check with this post.

-Amanda

[AimHigh]

Exactly what is happening to me, LED5 blinks slowly but on computer, USB is not recognized due to malfunction. I have measured voltages on the Kit btw VDD and GND  it is showing 2.92 ~2.93V

Heres the video and image 

 

What shall I do now in this scenario?

[AimHigh]

What could be the problem? Downtime is really piling up the development pressure. I appreciate if someone could step in and resolve this problem asap!

[AimHigh]

In my observation, I tried to enter boot mode using a coin battery and it did enter boot mode(except that LED flashes every second. Same situation as if it is connected to USB and not recognized). 

But the strange thing is when entered boot mode using a coin battery, LED5 would blink and die out quickly. Like as if something is shorted on the board. And this phenomenon is difficult to observe when it is connected thru the USB port. 

Does that give any clue?