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Asus P4P800 SE dead

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    #21
    Re: Asus P4P800 SE dead

    The caps are going to be late... Not that I care, now I am worried about my main computer recap project.

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      #22
      Re: Asus P4P800 SE dead

      The p4 processor I'm using to test that board has 1.75V nominal voltage.

      I tested the Vcore caps voltage with my multimeter and I got a steady 1.83V.

      Does this rule out that the motherboard doesn't post due to bad Vcore caps?

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        #23
        Re: Asus P4P800 SE dead

        Originally posted by goodpsusearch View Post
        The p4 processor I'm using to test that board has 1.75V nominal voltage.

        I tested the Vcore caps voltage with my multimeter and I got a steady 1.83V.

        Does this rule out that the motherboard doesn't post due to bad Vcore caps?
        No.
        You would need an o'scope to check the ripple.
        .
        That also doesn't sound like a good reading for DC.
        It looks like the VID is screwing up and setting the wrong voltage.
        That could be a small cap or an SMD part [cap, diode, resistor] causing the controller IC to get the wrong voltage or that is corrupting one of the VID signals to it.
        .
        Mann-Made Global Warming.
        - We should be more concerned about the Intellectual Climate.
        -
        Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
        - Dr Seuss
        -
        You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
        -

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          #24
          Re: Asus P4P800 SE dead

          I have a P4C800-E Deluxe here which uses this IC for that.
          https://cdn.badcaps-static.com/pdfs/...5a7e781990.pdf
          There's a fair chance you have the same IC.
          Page 7 shows the voltage steps which are 0.0125v.
          .
          Last edited by PCBONEZ; 02-08-2012, 11:02 AM.
          Mann-Made Global Warming.
          - We should be more concerned about the Intellectual Climate.
          -
          Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
          - Dr Seuss
          -
          You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
          -

          Comment

            #25
            Re: Asus P4P800 SE dead

            I took out all the OST caps from the VRM and tested with the ESR Micro Meter. It showed 0.00-0.01, so the problem isn't capacitor related.

            Thank you very much for the help! I will keep the board for parts, unless I have free time to mess more with it and look for faulty ICs.

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              #26
              Re: Asus P4P800 SE dead

              Dead southbridge is a common sign of 5VSB overvoltage, like from a Bestec gone crazy.

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