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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:

Diode

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".

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  • \$\begingroup\$ It is likely that the layout has an effect on the performance, so using wires and especially a different diode will cause problems. The best chances to fix the board is pribably to reverse-engineer that part of the circuit and find a suitable SMD replacement. The product marking "NU" does often not help much as that's difficult to find with search engines. \$\endgroup\$
    – Sim Son
    Mar 12, 2022 at 15:46

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Looks to be a DZ2J100. Marking confirmed in datasheet.

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  • \$\begingroup\$ Thank you! Now to find out where to get one (or a handful) or what a decent equivalent is. \$\endgroup\$
    – RobIII
    Mar 15, 2022 at 16:14

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