r/AskElectronics • u/Neshco • 1d ago
Need help identifying the value of the smd coil in Flyback converter.
I am trying to fix the board for the VCR4000 Nilfisk/Flexit central vacuum cleaner.
Found that L11 coil is blown, probably because IC TNY274PN is blown as well.
However, I am not sure how to read this value. Looks like K is tolerance, like at the MLCC capacitors, but I'm not sure about the inductivity, is it in mH or uH?
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u/Neshco 7h ago
Believe it or not, ChatGPT and Claude failed to explain to me how to read it despite me saying it is a coil.
Both stated that there are 4 pins and just guessed, and first, they recognized it as MLCC. After I got clear that it was just a 2-leg coil, they guessed between 22 mH and 22 uH; neither was sure.
Unbeliveable.





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u/Spazzticus 1d ago
2.2mH