I'm trying to see if I can get this thing fixed. I already have a spare from AliExpress but it would be cool to see if I can get my DIY one fixed.
It's this diode marked only "NU" and is ab-so-lutely tiny:
I only have through-hole diodes available currently. I was considering soldering a similar specced one to a bit of 0.1mm enameled wire and from there to the PCB. I have room to spare in the enclosure. I could also just bridge the pads and see if that works but I'd rather not. Ordering an SMD replacement is an option, just not a likely one.
I tried the SMD code book but couldn't find anything for "NU".