GTX480 short/vCore issue

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  • tony359
    Badcaps Veteran
    • Oct 2018
    • 259
    • United Kingdom
    #1

    GTX480 short/vCore issue

    Hi all,

    I have a weird issue with a GTX480 I am repairing for fun.

    Originally it would crash Windows when drivers were being installed. I checked with MATS and found a faulty RAM IC. I replaced it, MATS is happy but still the installation fails to install the driver - but no more BSOD.

    While testing I found something weird.

    What I think is the VCORE, is completely shorted. I read 0.4 Ohm to ground. I'm aware that low resistance is normal around a GPU but I don't think 0.4 is ok?

    If I check the inductors and all the mosfets, they all read shorted to ground.

    If I use the oscilloscope, I see the attached (vcore.PNG) but that might be because I am very close to the inductors - I believe I found the same signal at the back and it's smooth.

    Do you think it's normal to read 0.4 Ohm on a vCore for a GPU??

    Thank you!
    Attached Files
    Last edited by tony359; 04-24-2023, 04:08 PM.
    Tags: None
    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3597
      • slovakia
      #2
      Re: GTX480 short/vCore issue

      yes

      if gpu is shorted u dont have picture at all

        Comment

        • tony359
          Badcaps Veteran
          • Oct 2018
          • 259
          • United Kingdom
          #3
          Re: GTX480 short/vCore issue

          Yeah that’s what I thought.
          The card works. The issue with the driver seems to be windows 10 as drivers work totally fine in windows 7. I did some stress tests and they are all fine.

          But 0.4ohm on GPU phases? Really?

            Comment

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