thread top ad

Collapse

Announcement

Collapse
No announcement yet.

820-4924 short on ppbus, repaired and still no green light

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • 820-4924 short on ppbus, repaired and still no green light

    820-4924 PPbus_g3h was shorted at C7900 to ground, injected power, and it heated up, under microscope it was obvious damaged,

    D7005 Pin 1 -1.6v-1.7v, Pin 2 0v, pin 3 1.49v-1.6v

    D7005 on diod mode Pin 2 - 0.13, Pin 3 0.33

    PPBUS_G3H: 0 V
    PP3V42_G3H: 0.18V
    PPVRTC_G3H: 0.0V
    PP5V_S5: 0.0V
    PP3V3_S5: 0.0V

    PM_SLP_S4: 0.0v

    SMC_BC_ACOK: 0.18V


    SMC_ONOFF_L: 0.18V

  • #2
    Which is the resistance to ground at PPBUS_G3H and 3V42 rails now?
    Also check at pin 3 of D7005.
    Post Q7010 voltages.

    Comment


    • #3
      Tried known good DC in board and OEM Chargers for sure?

      Comment


      • #4
        resistance to ground ppbus_g3h 0.62, 3V42 - 0.18V

        Q7010 pin 2,3 - 1.8V, Pin 5,6 1.9V, Pin 4 0.22V

        Resistance to ground------------
        Q7010 pin 2,3 - 75.2, Pin 5,6 34.34, Pin 4 21.99

        Known DC working, tried multiple ones

        Comment


        • #5
          Seems that charger detects leakage and gets blocked.

          You should have aprox 68k at pin5/Q7010 to ground; the value of R7012.
          Check if D7012 is open, or shorted to ground.

          Q7010 last posted values are in ohms, kohms, diode mode???

          Comment


          • #6
            q7010 are kohms,

            and D7012 is not found, could have been mis written ?
            Last edited by nelo1012; 04-11-2019, 08:50 PM.

            Comment


            • #7
              Sorry, is D7010 in this board...

              Comment


              • #8
                problem was D7010, it was a bit damaged for some reason, so im guessing it was not opening, another sucessful repair, thank you guys so much, specially you 2informaticos!!

                Comment

                thread bottom ad

                Collapse
                Working...
                X