Identifying a Missing SMD Component Asus ROG Strix H370-I

[90Ninety]

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

[90Ninety]

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

[90Ninety]

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

[Bozog]

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?

[90Ninety]

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 .

[90Ninety]

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 .

[R_J]

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

It seems to be a AZC099-04SP.R7G

[anikin73]

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