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820-4923 - green light, no boot, no liquid damage

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  • 820-4923 - green light, no boot, no liquid damage

    Got this board, which i cant figure out, no story of what happened, no liquid damage, below some board info, Thank you guys in advance!

    PPBUS_G3H: 12.59V
    PP3V42_G3H: 3.431V
    PPVRTC_G3H: 3.336V

    PP5V_S5: 5.15V
    PP5V_S4: 5.15V
    PP5V_S3: 5.15V

    PP3V3_S5: 3.341V
    PP3V3_S4: 3.341V
    PP3V3_S3: 3.341V


    PM_SLP_S4: 3.34V

    SMC_BC_ACOK: 3.4V
    SMC_PM_G2_EN: 3.40V
    PM_BATLOW_L:3.31V
    SMC_ADAPTER_EN: 3.37V
    PM_SLP_SUS_L: 3.341V

    SMC_ONOFF_L: 3.429V


    PP1V2_S3_CPUDDR: 1.19V
    PP1V05_S0: 1.05V
    PPVCC_S0_CPU: 0V

  • #2
    Isn't 820-4924???

    ALL_SYS_PWRGD present?

    Comment


    • #3
      typed it wrong! 820-4924 sorry

      ALL_SYS_PWRGD - 0.10V

      DIODE mode to ground 0.23
      RESISTANCE to ground 14.85 Kohms

      PP5V_S0: 5.15V

      PP3V3_S0: 0.30V

      U1950
      PIN 1 - 0.10V
      PIN 2 - 0.30V
      PIN 3 - 0V
      PIN 4 - GRND
      PIN 5 - 0V
      PIN 6 - 0V
      PIN 7 - 0V
      PIN 8 - 3.41V
      Last edited by nelo1012; 04-12-2019, 04:31 PM.

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      • #4
        ALL_SYS_PWRGD is required, before VCORE comes on.
        Check which power supply pulls it down.
        Start removing Q8150, not really needed...

        Comment


        • #5
          took off q8150,

          im sorry for my stupidity, but i am not good at determining which power supply pulls a line down,

          i want to sound dumb and say PP3V3_S0,

          Comment


          • #6
            Fixed, U8030, problem was that PP3v3_S0 was not being created by U8030

            Comment

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