dell d420 power problem, Please help.

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  • nazrul145
    Badcaps Veteran
    • Jan 2014
    • 333
    • BD

    #1

    dell d420 power problem, Please help.

    Hi there, i have problem with dell latitude d420 with no power. TPS51120 vreg3 and VREG5 ok. But PL6 and PL7 Have not any voltage. i checked TPS51120 Pin29 EN1 and Pin 12 EN2 is 0v. Also SIO not release Aux_en and Sus_on voltage to enable 51120. I have change sio and reflash bios but sio not release aux_en voltage. Now i want help which pin voltage is input of sio for find those voltage.
    PN: La-3071p
    Please help to find this problem.
    Attached Files
  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3574
    • slovakia

    #2
    Re: dell d420 power problem, Please help.

    what about ALWON signal?

    Comment

    • spidey
      climbs
      • Dec 2012
      • 644
      • Cyprus

      #3
      Re: dell d420 power problem, Please help.

      Check EC power (3.3v)present and ACIN, LID_SW is 3.3v

      Comment

      • nazrul145
        Badcaps Veteran
        • Jan 2014
        • 333
        • BD

        #4
        Re: dell d420 power problem, Please help.

        thanks for help.
        ec power 3.3v ok, alw_on 3.3v ok. Max 8731 ACIN 2.2v, Which pin is lid_sw? i cant identify this point.
        Last edited by nazrul145; 10-28-2014, 04:09 AM.

        Comment

        • spidey
          climbs
          • Dec 2012
          • 644
          • Cyprus

          #5
          Re: dell d420 power problem, Please help.

          It is very old system and looks like it has 2 separate SIO that have different functions. On page 46, EMC5004 which has the power functions and if i'm not mistaken ACIN is ACAV_IN, lid_sw is LID_CL_SIO#. Check that pins, i hope it helps. Good luck..

          Comment

          • nazrul145
            Badcaps Veteran
            • Jan 2014
            • 333
            • BD

            #6
            Re: dell d420 power problem, Please help.

            Thanks for reply, but ACAV_IN and LID_CL_SIO also 3.3v.

            Comment

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