Need help fault tracing RX580 GPU

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  • survivalbloke
    Badcaps Veteran
    • Aug 2021
    • 289
    • United States
    #1

    Need help fault tracing RX580 GPU

    Hey!

    I'm working on a Sapphire RX580 Pulse graphics card which has no power. As shown in the picture, the two main B+ fuses are both open. If I measure from the bottom end of the fuses to ground, I get 1.3ohms, which I *think* means I'm reading resistance of the GPU - I'm still very much learning. Ground to output side of Vcore coils shows the same, 1.3ohms. If I inject 1v 2a into the bottom of the fuse, I'm sinking almost the entire 2a into the GPU which is the only visible component on a my thermal camera.

    I'm not sure where to go here. I'm tempted to just pull the driver to see if the short goes away but before I do that, I wanted to check in here to make sure I'm not chasing my tail.
    https://imgur.com/L7xBpkl
    Tags: None
    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3582
      • slovakia
      #2
      Re: Need help fault tracing RX580 GPU

      1.3ohm mean u have shorted power stage/mosfet,optimos,.../

        Comment

        • survivalbloke
          Badcaps Veteran
          • Aug 2021
          • 289
          • United States
          #3
          Re: Need help fault tracing RX580 GPU

          Originally posted by ktmmotocross
          1.3ohm mean u have shorted power stage/mosfet,optimos,.../
          Yeah, but I'm wondering, how can I tell if it's one of the power stages or the driver chip? Also, what's a optimos?

            Comment

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