I am repairing an EVGA gtx 1080 8GB video card. It seems to have suffered damage in a power surge from what the original owner claimed. (Keep in mind there was many of these cards with VRM overheating issues, however this is a newer card that came with the silicon thermal pads pre-installed on the VRM’s so this is not the issue the card is having). In fact the card partially works if I use the built in windows VGA driver it displays fine - however when loading the Nvidia drivers the screen gets artifacts.
I have located one part that appears to have been blown/damaged at Q3302 but I cannot identify it despite locating multiple schematics at ( gadget-manual dot com /nvidia-geforce ) reason being - I am not able to open most of these diagrams on account of requiring Auto-Cad and similar softwares.
From what I can tell it appears to be a type of SMD transistor and the print on this part says AG4X (with an 18 written sideways to the main print if that means anything) again it is located at Q3302.
Can anyone help me to figure out what part to order from Digikey?
See attached files.
Hello Dr_PC_Repair. I found that AG may be the marking of some transistors that begin with 2SAxxx, however none that we carry. One that we do have is from Alpha and Omega: AO3416 785-1011-2-ND. No guarantee that this is your part, though. Here is a helpful link for surface mount part markings. Hopefully, you’ll get additional input from others on the Forum. As for the marking on the capacitors, because of their small physical size, not all will be marked.
(Also there is pink ink/paint blotched on this IC as some indicator from the factory like “passed” but there also appears to be a blotch of clear ink/paint? - or perhaps this is also an indication of a melted point on this IC as well? This seems similar to the melted AG4X part but I can’t tell if it’s melted or some sort of factory paint/marking - honestly I doubt this IC would also be damaged as the card more or less functions until the driver is installed which then requires extra power - I seem to think the only issue with the card is Q3302 - which I can clearly see has a bump/dent not looking like it might also be some clear paint/marking)
Well… any idea on how fast I might expect some answer from users on this forum?
I ask because I have an order to place for other components which I was delaying placing because I wanted to include this “AG4X” part so I did not have to make a 2nd order paying $10 shipping again (after it’s been identified) but since it’s Wed the shipping time (to Canada) has been 2 days, so if I don’t place the order tonight I might end up having to wait until after the weekend for delivery on these parts (which includes a large capacitor needed for a repair on a vintage iMac for a customer who wants it restored as a show piece)