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Identifying a Missing SMD Component Asus ROG Strix H370-I

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    #1

    Identifying a Missing SMD Component Asus ROG Strix H370-I

    I have some semi working motherboards from a computer salvage lot on ebay . I was hoping to fix and repurpose them.

    I have a mostly working Asus ROG Strix H370-I, I noticed the .2 WIFI slot does not work .

    I then traced the board and there is a component missing here, as shown in the attached images ( image 1 is a generic image off web, image 2 is my board )

    I reached out to Asus but I don't have much hope of them helping me out.

    Can anyone identify this ?

    Thanks in advance , this will save it from potential landfill
    Attached Files
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    #2
    Re: Identifying a Missing SMD Component Asus ROG Strix H370-I

    Asus typically wont help . They technically could but wont .

    Wish 'right to repair' was enforceable

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      #3
      Re: Identifying a Missing SMD Component Asus ROG Strix H370-I

      I looked at some similar boards that have the same shape/size component , that run along the same traces ( from M.2 and USB) . On another board (B350 ITX) , it appears it has potentially two of these mystery components . A spare board a ESD Transistor C96CH, these are not available to buy , however there are similar ESD Transistors of the same size e.g 'C96BJ'

      Perhaps I should just try this and see what happens

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        #4
        Re: Identifying a Missing SMD Component Asus ROG Strix H370-I

        If the mystery device is a esd protection diode array, I think its absence would not stop the wifi slot from working. Maybe the protection array failed and was removed, but something else blew at the same time?

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          #5
          Re: Identifying a Missing SMD Component Asus ROG Strix H370-I

          You may well be correct . The missing component's pad traces lead to the Intel Ethernet and USB 3.1 slots , the ethernet works full Gibabit , but the USB on these traces runs very slow (others are fine) .

          There is continuity between the missing components pads and the WiFi slot, hence my assumption that the non working WiFi Slot , though I may be wrong .

          Since I first posted I actually tried another couple of spare WiFi cards in the spare PCIE M.2 Slot, strangely the Wifi Card with less lanes (M.2 Less contacts) worked (in picture) just fine . Whereas the WiFi cards with more contacts/lanes get a 'code 10' error .
          Attached Files

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            #6
            Identifying 'C34QH' SMD Component Asus ROG Strix H370-I

            I had found a supplier of the same board , whom took some pictures of the missing component, the missing component is named 'C34QH' (Picture attached)
            I couldn't find anything on Google so , I am back here to try figure out what this is . As shown there are traces that lead to the USB 3.1 ports and Ethernet .
            Attached Files

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              #7
              Re: Identifying a Missing SMD Component Asus ROG Strix H370-I

              It seems to be a AZC099-04SP.R7G

              Comment

                #8
                Re: Identifying a Missing SMD Component Asus ROG Strix H370-I

                its a ESD protection array ..google the spec . this item can be found in many mobo

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