PCA10056 Not working

[vishal.roy]

Just bought 2 nrf52840 DK's both stopped working

Observation

• Was able to program and run SDK examples.
• Above working setup not disturbed,so all cables are in order verified that
• The current problem i have:
  1. when I connect the DK to PC the device is not shown in device manager initially.After awhile it pops up
  2. When I try to flash it fails and LEDs switch of and come back up.
  3. The board had the blinky example code.So if from Step 1 I toggle IF Boot/Reset switch I can see the UART logs in terminal.
  4. Very weird observation is there is buzzing sound coming from the board.Can i do something to fix this issue.
  5. When I go near the switch usb/VDD/Lipo selection the entire board switches off and comes back up as a move my hand.Attached video.The buzzing sound can be heard in video
•  

[Simonr]

Again, thank you for the update. I have updated the internal ticket and we are currently looking into this. Does your other board work as intended now, or not at all? Can you try removing the battery from the DK as well to see if the issue still ensues? Does your device reset like this if you touch the VIO_REF pin on header P20 as well?

Best regards,

Simon

[vishal.roy]

• Yes it does and also if touch C92 i get same issue.
• The other board works as intended not seeing this issue if use the probe to touch SW9 as shown in video,but this happens when I make contact with VIO_REF(Both boards resets if i touch VIO_REF)
• Tried removing the battery on the board same observation.All switches in default locations.