help ID Soyo P4VTE MOSFET and cap?

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  • macgyver
    New Member
    • Nov 2009
    • 7
    #1

    help ID Soyo P4VTE MOSFET and cap?

    This is a Soyo (SY-)P4VTE motherboard that got screwed over by a bad video card. The card was inserted and had a short, which burnt out a MOSFET and blew a small capacitor near the AGP slot. The board powers up fine, but of course doesn't post or power up video.

    The MOSFET in question is a Niko Semiconductor P3055LD, basically an N-channel 25V/12A model in To-252 packaging. The datasheet is at http://datasheets.ru/datasheets/3932...a-P3055LD.html. I've been unable to find it (or an equivalent) at Mouser Electronics, DigiKey, or Jameco. I e-mailed all to get either no response or simply "can't help you". I've also got a message in to Niko Semiconductor (http://english.niko-sem.com/in/front...CompanyProfile) at all the contacts they've listed as they don't list a technical contact and don't appear to deal with the US directly. Incidentally, Niko appears to make a P3057LD with the same specs.

    The blown cap, marked CB26 on this board, is unidentified and long gone. I *do* have another of these boards, but it's simply a brown surface-mount cap with no markings on it. How can I (non-destructively) measure capacitance to ID it? Can I make measurements while connected on the working, good board?

    I'd appreciate any help identifying these components and equivalent substitutes I can get in the US.

    Thanks in advance!
    Tags: None
    • PCBONEZ
      Grumpy Old Fart
      • Aug 2005
      • 10661
      • USA
      #2
      Re: help ID Soyo P4VTE MOSFET and cap?

      http://cgi.ebay.com/ws/eBayISAPI.dll...m=330369964185

      For the cap, if you don't want to pull it to measure.
      Trace the circuit.
      If nothing is in parallel you can measure it where it is.
      .
      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

        • richr69
          Senior Member
          • Jul 2010
          • 58
          #3
          Re: help ID Soyo P4VTE MOSFET and cap?

          The alldatasheet website is your friend See http://www.alldatasheet.com/view.jsp?Searchword=P3055LD.

            Comment

            • richr69
              Senior Member
              • Jul 2010
              • 58
              #4
              Re: help ID Soyo P4VTE MOSFET and cap?

              Sorry about that, you already have the data sheet on the MOSFET. The website is still a good resource.

                Comment

                • Th3_uN1Qu3
                  Believe in
                  • Jul 2010
                  • 6031
                  • Romania
                  #5
                  Re: help ID Soyo P4VTE MOSFET and cap?

                  Originally posted by macgyver
                  but it's simply a brown surface-mount cap with no markings on it.
                  All bypass caps in digital systems are 100nF. Since this cap you are talking about is near the power MOSFET so it's in a power supply, it's a no-brainer. It is 100nF no doubt about it.
                  Originally posted by PeteS in CA
                  Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                  A working TV? How boring!

                    Comment

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