Need help fault tracing RX580 GPU

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  • survivalbloke
    Badcaps Veteran
    • Aug 2021
    • 280
    • 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
  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3580
    • 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
      • 280
      • 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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