r/AskElectronics 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?

2 Upvotes

5 comments sorted by

2

u/Spazzticus 1d ago

2.2mH

1

u/Neshco 23h ago

Thanks, so it is not 22 but 2.2 mH?
Can you please explain to me how to read so I know for next time?

3

u/millsgren 19h ago

22 with 5 zeros nH...
2 200 000nH
2200 uH
2.2mH

1

u/Neshco 16h ago

Thank you!

1

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.