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PP3V3_S5 Missing on 820-3437

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  • PP3V3_S5 Missing on 820-3437

    hi guys,

    im having some issue with this 820-3437 board,condition should be as below :

    plug in charger,green light,

    PPBUS_G3H fine at 8.56v
    PP5V_S5 at pin 1 C7505 is fine at 5.02v

    but PP3V3_S5 to wake the machine at pin 5 U8180 is missing.

    what created the pp3v3_s5? i check at PP3V3_S5_REG_R also missing.

  • #2
    pp3v3_s5_en

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    • #3
      S5_PWR_EN present? Look around U7501 area

      Comment


      • #4
        S5_PWR_EN at pin 1 R7552 is 3.415v

        Comment


        • #5
          is the 3v3 power supply being told to turn on, is there power coming out, is there a short to ground

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          • #6
            L7560 should have 3V on it then. If not then check for a short on this rail. If not shorted a bad U7501 is possible, also check for corroded traces around there.

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