I killed my Pixl.js board after connecting accidentally 12V directly to one of the GPIO pins. That was really frustrating, as I need the board for a Trumpet Playing Robot I'm trying to build together with friends.
Before declaring the board a total-loss, I decided to try and fix it by replacing the nRF52832 chip inside the Bluetooth module. It felt like a long shot to me, but I didn't have much to lose so I tried anyway. Surprisingly, it worked and was even easier than I initially thought. I shared a blog post with all the details, many photos and even some videos of the process: