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820-3024 PPVCORE_S0_AXG_REG missing

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  • 820-3024 PPVCORE_S0_AXG_REG missing

    Hi team,

    I have a 820-3024 that had a liquid damage but cleanned by someone else.
    the board is turning ON, fan spin and getting faster and faster , maybe sense issue.

    I have PVCORE_S0_CPU :1.159V and no PPVCORE_S0_AXG_REG:

    at Q7550:PPVIN_S0_CPUAXG: 8.37V

    at U7400
    P5V_S0_CPUIMVP_VDD: 5.065V
    CPUIMVP_VR_ON: 3.319V

    CPUIMVP_BOOT1G: 4.791V
    CPUIMVP_UGATE1G: 0V
    CPUIMVP_PHASE1G: 0V
    CPUIMVP_LGATE1G:0V

    Resistance pin8/9: 56Ohms OK
    CPUIMVP_IMAXB: 1.953V
    R7440: 10 Ohms
    R7423: 10 Ohms

    by comparaison
    CPUIMVP_IMAXA: 6.229V
    CPUIMVP_IMAXA: 1.844V
    CPUIMVP_PHASE1: 1.166V
    CPUIMVP_LGATE1: 4.355V
    CPUIMVP_IMAXA is 1.965V


    R7467 and R7469 both removed and mesured around 80Kohms
    Resistance to gnd at L7550/R7550 15 Ohms

    Question: What is not present or peventing U7400 for not turning the AXG rail ON?

  • #2
    What is the problem the board turning on or the sensors failing?? Run ASD and report any errors.

    Comment


    • #3
      Hi , thanks for replying
      ​​​​​​
      I've forgotten to say that it doesn't chime, doesn't boot, doesn't display , and also no backlight..
      It's just fan spinning faster and faster.

      Comment


      • #4
        I think PPVCORE_S0_AXG is present only when screen turns on / is detected?

        Comment


        • #5
          Really ? Can someone please confirm.
          ​​​​​​Thanks

          Comment


          • #6
            So i've replaced the Lio board and also tested with a good known screen but it's still the same

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            • #7
              I know from 820-2936, for Sandy Bridge AXG CORE should be present from the begining; it appears with 0.9V but rapidly drop and stays at 0.45V.
              Maybe not valid for al of them.

              In case of 820-3115, with Ivy Bridge I saw many of them giving image on LCD without AXG VCORE.
              You may see it for 2-3s with 1V and drops to 0V.

              So I cannot confirm 100% for your board; supposed to be Sandy Bridge.
              But if you can confirm USB activity, then probably AXG CORE stays at 0V until graphics load increases, like in Ivy Bridge models...

              Comment


              • #8
                Hi Team,


                I replaced the U6100 with a SOIC package one, because no WSON is stock, with a fresh clean dump: Turned it ON but had the same result, then I press power button before plugging the charger suddenly it chimed and booted correctly with image and backlight.

                But I've noticed that the ON/OFF power button doesn't work: I can't turn it OFF whith long press on the Power button.
                I did a PRAM reset successfully, but not sure for the SMC reset as the Power button doesn't react: so far Power button doesn't work.

                Should I open a new topic for this?

                Comment


                • #9
                  Disconnect keyboard.
                  Use SMC_ON_OFF_L to see if turns on/off correctly...

                  Comment


                  • #10
                    Hi,
                    You can mark this thread as SOLVED,
                    Regarding the Power buton the pin 11 of J5700 was not soldered correctly, after soldering it was still NOK i followed the line to different points on the trackpad board, passed throught a 1 KOhms resistor to the keyboard connector on the ttrackpad board when pressing on the power button I had no feedboack to the ground directly at that point so I assume that it's a keyboard issue.

                    Thanks 2Informaticos for your help and support Muchas Gracias amigo

                    Comment

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