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
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    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3577
      • slovakia
      #2
      Re: dell d420 power problem, Please help.

      what about ALWON signal?

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        • 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.

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