Dell 3542 no stand by voltage

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  • badal5130
    Senior Member
    • Aug 2018
    • 56
    • nepal

    #1

    Dell 3542 no stand by voltage

    There is no stand by voltage (2 mobo with same problem) on Dell 3542 fx3me. There is no voltage on gate of the mosfets.i have changed the power ic but no luck....what should I check now...???please guide me thanks in advanced
  • sourcebf
    Badcaps Veteran
    • Jul 2016
    • 431
    • N/A

    #2
    Re: Dell 3542 no stand by voltage

    Let's start with schematics here you go
    Attached Files

    Comment

    • sourcebf
      Badcaps Veteran
      • Jul 2016
      • 431
      • N/A

      #3
      Re: Dell 3542 no stand by voltage

      there is voltage (19V) in PR4402 ? see schematics page 43

      Comment

      • badal5130
        Senior Member
        • Aug 2018
        • 56
        • nepal

        #4
        Re: Dell 3542 no stand by voltage

        yes there is voltage in 4402 and also on in of power ic but no output on gate of mosfet

        Comment

        • sourcebf
          Badcaps Veteran
          • Jul 2016
          • 431
          • N/A

          #5
          Re: Dell 3542 no stand by voltage

          Originally posted by badal5130
          yes there is voltage in 4402 and also on in of power ic but no output on gate of mosfet
          you talk about PU4503?? 5V and 3.3V Always?

          Comment

          • sourcebf
            Badcaps Veteran
            • Jul 2016
            • 431
            • N/A

            #6
            Re: Dell 3542 no stand by voltage

            see the attached picture
            Attached Files

            Comment

            • badal5130
              Senior Member
              • Aug 2018
              • 56
              • nepal

              #7
              Re: Dell 3542 no stand by voltage

              yes..that means it must be 3.3v input on pwr_5v_en1 and 3.3v en1 to generate 3.3 and 5v always ...

              Comment

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