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I can’t find what kind of component the black one with 150 on it is.
I thought a condensator but i can’t find anything resembling.
Part of a Netgear prosafe m4100-50g-poe+ network switch.
Es esta una buena pregunta?
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Hi @gmantunt
Normally there are some tell tale sign at the pcb components, e.g. C = Capacitor,
the picture, i would say is an inductor. It should be Label as L xx on the PCB
The number 150 indicates the value 15uH if im not wrong,
and btw what is the issues with this POE switch?
Fue útil esta respuesta?
Thank you. It is indeed.
For reference to others in search:
After searching a bit on 'Inductor' and 'inductor coil' i found multiple 'ferrite inductor coil' pictures that look the same.
The PCB says L62 and L63 but i don't know what i can do with that.
The switch doesn't have much problems. One fan is broken but still spinning. It was grinding itself away as far as i can see and the switch is filled with nasty dust and plastic. So my goal is to clean it and replace the fans.
While taking it apart i found some spots with an oily substance so i started looking for broken conductors or something similar i.e. the source.
I saw the inductor and was unfamiliair with it. It was weirdly shaped and others looked better so this was a potential broken part.
btw inductors rarely fails..... main concerns are those electrolytic capacitors, esp can be found on power supply....
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It looks like a 150ohm inductor coil to me, or it may be 15uH like @salmonjapan said. Take it off of the board and check it with an ohm meter, and see for sure.
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@nick ,
To my knowledge inductors are never marked as Ohms value as their reactance (AC resistance i.e. XL =2πfL) can change with frequency.
Their DC resistance will also be extremely low for that value of inductance as can be seen on this datasheet example for a 15uH inductor. It is in milliOhms
To measure its inductance you would need an LCR meter unless it tested open circuit with an Ohmmeter
Cheers
@jayeff yea right bro..... having a simple LCR meter is good though......
like for me ... have one cheap gm328a standby ...
inductance measure in henrys
@salmonjapan I've done ohms checks with my multimeter, but I consider it a rough guestimate to be double checked.
@jayeff DMM is def a in a pinch option. Do not rely on it for dead on accuracy.
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