Help identifying components EVGA RTX 2080 Black Edition

[trepachka]

Hello,

I have this EVGA RTX 2080 Black Edition (Printed EVGA196) graphics card that works just fine when idling but quickly heats under a load.

I noticed fan speed always stays @ 0 rpm which is a problem. Under close graphics card examination, I found a burn spot near the FAN connector. Also, both pins 5 and 6 on the PCIx1 key are showing 13 ohms.
Voltage injections on either of these pins has revealed U628 heating up. I am including a photo of this component. It's some kind of a mosfet switch with markings "ELMAC" (letter "C" has underscore). Sifting thru donor boards, I found some "GAF" chips that look just like this chip but I don't know whether it is a match or a good replacement for it. I do not wish to kill this motherboard foolishly.

I do not have either boardview or schematics for this graphics card. I hope someone can help me identify this component. Also, if you can look at that burn spot, perhaps it used to contain a component. I would be needing this info as well.

Thanks.

[noname2024]

gs7612s5ma-r

[trepachka]

Thank you for responding. Can I substitute this IC chip for AP2204K (GAF) chip?

Also, for testing purposes, Can I remove the shorted chip, bypass it by connecting Vin to Vout?

[noname2024]

connect pin 1-5

[trepachka]

Yes. This will allow me to test the circuit.

Can you tell me whether this chip is related to fan control? Also, I provided a photo of the burn spot. It is located directly under the fan harness. Do you know if there was a component there? Without boardview or a donor board I am clueless.

[trepachka]

Last question. I found this IC here: https://www.digikey.com/en/products/...3-33GB/2470048

It looks like I can use it in this circuit. Can you confirm?

[trepachka]

I removed the chip and the short is gone. I hard wired pins 1 and 5. No change. Fan speed is still showing 0 RPM