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820-3476-a not turning on.

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  • 820-3476-a not turning on.

    Hi,

    Logic board was water damaged in U7501 area. Cleaned, replaced U7501 and R7537 C7537 C7536 that were burnt. Now seems that i am getting all reail ok but dont getting ALL SYS GOOD.


    CHecked and seems that board tries to enter S0 state once connect adapter. PP3V3_S0 is 1.7V and PP5V_S0 0 V. As i see i will not get sys good while PP5V_S0 is not activated.


    Bad U7501 ??? ALready replaced it twice.

  • #2
    Post voltage on big coils.
    Also check for short on all power rails which don't even pulse.

    Comment


    • #3
      L7130 - 12.6V

      L7520, L7320/10, L3095 are 0V

      L7560 - 3.3V


      PPVCC_S0_CPU is shorted - 1.2 Ohms to ground,

      Comment


      • #4
        There are other coils I was expected to know the voltage; like PCH and DDR (L7630, L7430)...

        L7310/20 could be low ohm to ground as normal; compare with known good working board.

        Comment


        • #5
          Both are 0V.

          L7430 is 200 Ohms to ground and L7630 is 20 to ground.

          Comment


          • #6
            Do you get any pulse at L7520?
            Trigger SMC_ONOFF_L and check that.
            Check all other coils at same moment.

            "Now seems that i am getting all reail ok"
            How that?
            You've said to get only 3V3_S5; didn't say anything about pulse (at least) on other coils...

            Comment

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