What is this assembly on Abit SG-71 ?

[pfrcom]

I think I recall this SG-71 not working, so I put it aside

Having rediscovered it recently, I desoldered the remaining wires from the 8-legged IC, after which it did work

Although neither of its USB ports, nor its LAN port, work - assembly in question is just beside those ports connector block

So, what is it ? - an inductor glued to an IC, or what ?

Speaking of glue, I've tried scraping it off, without success

What can I do to fix it ? - rewind the core with strands taken from a cable, then resolder to the IC - or would those strands not being coated, be a show-stopper ?

Or replace the whole assembly with something from a scrap board ?

[stj]

Re: What is this assembly on Abit SG-71 ?

looks like a pulse transformer.
i dont think it's a chip under it - just the original base.

[mariushm]

Re: What is this assembly on Abit SG-71 ?

I'm also going with a transformer for the data pairs of the 100mbit network card. Use a continuity mode on your meter to find where those traces go, they probably go into that RTL8100 network chip.

[dragos2009]

Re: What is this assembly on Abit SG-71 ?

it's an inductor for filtering power to usb and lan

[pfrcom]

Re: What is this assembly on Abit SG-71 ?

Use a continuity mode on your meter to find where those traces go, they probably go into that RTL8100 network chip.

Didn't get a continuous beep from any of those 8 legs, to any of the leads on the Realtek chip

Two legs did give a brief beep to certain leads of the Realtek, similar to that produced when testing a Mosfet

[gabiz_ro]

Re: What is this assembly on Abit SG-71 ?

It could be also filter for USB data lines.
2 pairs of D+ and D- located in same area as network socket.

[pfrcom]

Re: What is this assembly on Abit SG-71 ?

I was too hasty opening this thread, thinking the assembly was unique to Abit

Not so, examination of scrap boards produced donor Gigabyte GA-8LD533, same vintage as SG-71

[pfrcom]

Re: What is this assembly on Abit SG-71 ?

Original removed from SG-71

[pfrcom]

Re: What is this assembly on Abit SG-71 ?

Donor assembly transplanted successfully - LAN and USB ports all working now

[stj]

Re: What is this assembly on Abit SG-71 ?

interesting that it also has pads for individual inductors.

[brethin]

Re: What is this assembly on Abit SG-71 ?

That looks like a "Common Mode Filter" something like this https://cdn.badcaps-static.com/pdfs/...1c67be10dc.pdf