Author Topic: Help Identify Component (Inductor?) Labelled 'EM' or 'W3'?  (Read 432 times)

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Offline jetpigeonTopic starter

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Help Identify Component (Inductor?) Labelled 'EM' or 'W3'?
« on: July 11, 2023, 09:39:59 am »
Hi All!

New to the forum and am excited to get a little more into this world.

I have a faulty 10G Brodcom NIC (BCM95780A1008G) - a casual inspection highlights what I assume are two broken inductors (photo of one attached). I've already desoldered the worst one (was in much worse shape than the pictured one) but am having a hard time figuring out exactly what they are and where I can find / buy new ones?

Photo attached, as far as I can see, the only identification on them are the letters 'EM' which doesn't seem to yield much when searching.

As pretty much a total newbie, can anyone help me on my path to identifying then and sourcing replacements?

Have done a fair amount of searching to no avail, but please forgive me if I've been stupid and missed something obvious. Thanks in advance!

Edit: removed in-line photo and attached instead.
Edit2: added photo of 2nd component, pretty sure it reads 'EM' but I guess it could be 'W3' upside down?
« Last Edit: July 11, 2023, 10:25:19 am by jetpigeon »
 

Offline ArdWar

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Re: Help Identify Component (Inductor?) Labelled 'EM' or 'W3'?
« Reply #1 on: July 11, 2023, 10:38:43 am »
They're most likely will work just fine if you left them as they are in your first picture.
 

Offline jetpigeonTopic starter

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Re: Help Identify Component (Inductor?) Labelled 'EM' or 'W3'?
« Reply #2 on: July 11, 2023, 12:05:53 pm »
Thanks for the reply. Unfortunately the 2nd one (that I've already removed) was so far gone that the connection on one leg was broken and not making contact.

I could try and solder on a small leg of metal and make the connection again I guess?

Presumably just bridging the connection would be a bad idea?

Thanks
 

Online MathWizard

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Re: Help Identify Component (Inductor?) Labelled 'EM' or 'W3'?
« Reply #3 on: July 12, 2023, 09:46:29 am »
It looks like it's just for rail filtering, rather than a DC-DC converter, unless all the circuitry is in the other side. A lot of circuits would not miss it, but IDK what that circuit really needs.

It's probably not super critical, you might find something similar on another similar PCB like a cablebox or old motherboard. How did they get damaged ?

If you can solder it back, I'd just do that, lay a little piece of bare copper wire between the pad and tinned end of the wire if the leg is too short now. Use flux if you have any, it would solder easy.
« Last Edit: July 12, 2023, 09:49:32 am by MathWizard »
 

Offline jetpigeonTopic starter

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Re: Help Identify Component (Inductor?) Labelled 'EM' or 'W3'?
« Reply #4 on: July 17, 2023, 02:30:38 pm »
Thanks MathWizard,

I'll have a go at re-soldering - I'm using this to learn with so I'm not too worried if it all goes wrong.

Not sure how it failed, it was pulled from a server as faulty and the damage was already apparent, there's a processor w/heat sync on the other side so I wonder if heat was a contributing factor? Or maybe it's just mechanical failure from poor handling in the past.

Sounds like attempting to re-solder is the way forward here then, I've had a look for similar components on other boards but as I'm new to this I don't really have much floating about that I can use for donor parts.

Thanks for your thoughts and advice, much appreciated.
 


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