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Dell 3421 wont turn on with strange behavior

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    #1

    Dell 3421 wont turn on with strange behavior

    Hi all
    I've been working on dell 3421 that won't turn on/charge
    Specs: i3-3217U no discrete gpu

    The behavior is
    -won't charge (charging light up for 3 second and goes away)
    -won't turn on if both battery + power adapter plugged in
    -in other way it can turn on with either power adapter only or battery only

    But sometimes all this issue goes away with no clear reason.
    Does it indicates faulty board chipset?
    Thanks
    Tags: None
    #2
    Re: Dell 3421 wont turn on with strange behavior

    Review the DCin mosfets. Often the 2nd DCin mosfet will be leaky. Review the sticky article above by @Piernov on charger circuits.

    Comment

      #3
      Re: Dell 3421 wont turn on with strange behavior

      Originally posted by mon2 View Post
      Review the DCin mosfets. Often the 2nd DCin mosfet will be leaky. Review the sticky article above by @Piernov on charger circuits.
      Digging around and just found out that 5v/3v tps51225 was faulty and glowing hot
      Thanks

      Comment

        #4
        Re: Dell 3421 wont turn on with strange behavior

        Before going for replacement of 51225 Ic,do take measurements of PSL logic circuit. Often, its PSL fault and not the PWM itself. Other reason could be shorting in RTC circuit.

        Comment

          #5
          Re: Dell 3421 wont turn on with strange behavior

          Originally posted by mcplslg123 View Post
          Before going for replacement of 51225 Ic,do take measurements of PSL logic circuit. Often, its PSL fault and not the PWM itself. Other reason could be shorting in RTC circuit.
          Ah, I'am so late for this.
          You're correct, the pwm it self was fine
          Still searching the rabbit hole..

          Comment

            #6
            Re: Dell 3421 wont turn on with strange behavior

            I'd check the peripherals that are connected in standby. Could be a bad keyboard or touchpad or the KBC chip itself.
            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

              #7
              Re: Dell 3421 wont turn on with strange behavior

              Originally posted by julianmustofa View Post
              Ah, I'am so late for this.
              You're correct, the pwm it self was fine
              Still searching the rabbit hole..
              Going by this board, its either shorted/leaky RTC and/or PSL circuit.

              Comment

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