Asus X756 no power.

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  • lapfix
    Badcaps Legend
    • Mar 2020
    • 2564
    • my workshop
    #1

    Asus X756 no power.

    Hello friends
    Got this motherboard that don't power on. Asus X756UXM.
    Power consumption stay at 0.02 amp before/after trigging.

    No short to ground at all coil.
    3/5v alwys are present.
    No shematics/brd...SIO- ene KB9026Q C so i use this brd from another asus to measure io requirements.

    https://www.badcaps.net/forum/showthread.php?t=85968

    +3VA_EC = 3v
    EC_RST# = 3v
    PM_PWRBTN# = 3v
    PM_RSMRST# = 0v !
    PWR_SW# = 3/0/3

    I try another bios ;ver 311 for X756UXK as mention at the ticket at ram socket but same issue.

    So what to check else!!
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13829
      • Canada
      #2
      Re: sus X756 no power.

      Start with the dcin mosfets and the charger IC.

      Remove all power, meter in resistance mode.

      Check the usual mosfet measurements to confirm the dcin mosfets are not defective.

      Source & drain
      Source & gate
      Gate & drain

      Post each resistance value and also the scale used on your meter.

        Comment

        • lapfix
          Badcaps Legend
          • Mar 2020
          • 2564
          • my workshop
          #3
          Re: sus X756 no power.

          Hello my friend

          Scale used : MOHM...other scale got nothing ( Kohm and Ohm )

          Acfet :
          Source & drain = 02.82mohm
          Source & gate = 03.11mohm
          Gate & drain = 01.05mohm

          Rbfet :
          Source & drain = 01.17ohm
          Source & gate = 03.19mohm
          Gate & drain = 04.55mohm

          Charger IC = BQ24780S
          pin 5 = acok = 3v
          pin 6 = acdet = 2.67v
          pin 24 = regn = 6v
          pin 28 = vcc = 19v

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: sus X756 no power.

              What is the resistance on RSMRST#?? Should be measured without any power source and should be 10K or higher.

                Comment

                • lapfix
                  Badcaps Legend
                  • Mar 2020
                  • 2564
                  • my workshop
                  #5
                  Re: sus X756 no power.

                  [QUOTE=lapfix;1150502
                  Rbfet :
                  Source & drain = 01.17ohm...not ohm but kohm
                  [/QUOTE]

                  Thank you mcplslg ...10.1kohm ..question : in asus motherboard no need to program io !!

                    Comment

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