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What is this assembly on Abit SG-71 ?

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    #1

    What is this assembly on Abit SG-71 ?

    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 ?
    Attached Files
    better to keep quiet and be thought a fool, than to open your mouth and remove all doubt
    Tags: None
    #2
    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.

    Comment

      #3
      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.

      Comment

        #4
        Re: What is this assembly on Abit SG-71 ?

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

        Comment

          #5
          Re: What is this assembly on Abit SG-71 ?

          Originally posted by mariushm View Post
          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
          better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

          Comment

            #6
            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.

            Comment

              #7
              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
              Attached Files
              better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

              Comment

                #8
                Re: What is this assembly on Abit SG-71 ?

                Original removed from SG-71
                Attached Files
                better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                Comment

                  #9
                  Re: What is this assembly on Abit SG-71 ?

                  Donor assembly transplanted successfully - LAN and USB ports all working now
                  Attached Files
                  better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                  Comment

                    #10
                    Re: What is this assembly on Abit SG-71 ?

                    interesting that it also has pads for individual inductors.

                    Comment

                      #11
                      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

                      Comment

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