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820-00165 2 quarter fan spin

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  • 820-00165 2 quarter fan spin

    WD, passed in the UC

    2 Quarter Fan Spin
    No green Light
    PPBUS_G3H: 8.19V U7100 not talking to SMC
    PP3V42: 3.415V
    PPVRTC_GH: 3.328V
    PP5V_S5: 4.987V
    PP5V_S4RS3: 0V
    CPUVCore, Pins 7 & 3 of U1950 twice too

    Able to read SPI Rom, and doesn't look corrupted.
    Checked all SPI Bus Series Termination resistors and traces: OK

    R17/18: 3.4 Ohms
    R27/28: 20.5 Ohms
    SMC_TDI and SMC_TCK shorted to GND under SMC

    reflowed SMC: fan was spinning at full speed then stopped after 2-3 minutes but still SMC_TDI and SMC_TCK shorted to GND.
    Waited turned off and on then came back to 2 quarter fan spin.
    When I put my probe on PM_DSW_PWRGD at R1451 the fan does a quarter spin, this rail is directely connected to the SMC

    Before removing SMC for reballing any suggestion?

  • #2
    "SMC_TDI and SMC_TCK shorted to GND under SMC"
    If is pure short, reballing doesn't help; change the SMC.

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    • #3
      Reballed SMC :
      Short to GND for SMC_TDI and SMC_TCK GONE both: 3.414V
      Goes in S3 State
      Fan Spin at ful speed around few minutes then stops
      NO Green Led
      PPBUS_G3H: 8.19V
      SMC_ADAPTER_EN: 0V
      SMC_S4_WAKESRC_EN: 0V

      All symptoms looks like SMC Dead or pb in reballing ( I'm not an expert in reballing: took few hours to reball this one and some ball smaller that the others )

      Comment


      • #4
        Replace the SMC.....

        Comment


        • #5
          I reballed the SMC again.
          Now I'm almost sure my reballing job is ok.
          Unfortunately The board reacts the exact same way: DEAD SMC
          00165 are compatible with 00164 right?

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          • #6
            No MUST be 00165....

            Comment


            • #7
              OK thanks
              Just to let you know that I reballed it again ( 100% sure ) exact same issue.
              Will try to get a 00165 SMC

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