Hello everyone,We're using a NRF52840 dongle for a Uni project.We got a couple of dongles it.I stupidly used a image on google to know the pinout because it's hard for me to see the pin numbers in the board. Lucky me - it was completely wrong. So I shorted VDD out with GND...The board now doesn't turn on from USB though it can be powered externally.Even more weird, if I power the 3.3V for a second it will start working from usb power only.Is there any way to solve this or do I have to use external regulator from now on?
Try replacing FB1 and FB2 with 0R resistors; in practice that means just short both FB1 and FB2, either by soldering or holding something metallic.Note I don't mean connect them together, you just want to bypass the filter which can fail if you pull significant current or even sneeze on them. They act like fuses.
that what I was thinking. I tried to measure somehow if that was the problem but didn't find anything evident to I let it be.The VBus pin and GND pins are okay (not sure if they are after the beads) so I just cut and soldered the sb1 and sb2 and added an external regulator.So there's no trying now :/ Thanks for the input, if I decided to undo what I did and try that I will report back.