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  1. #1
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    820-4924-a MBP 2015 water damage

    HI. IM working in my macbook pro 2015..... have little water damage. don't turn on. when try turn on with smc bypass quarter fan spin come..... I have measured all the rails.........


    PPBUS_G3H......................................... ...12,6v
    PPBUS_S5_HS_COMPUTING......................12,6v
    PPBUS_S5_HS_OTHER5V.......... ................12,6v
    PPDCIN_G3H_ISOL..................................1 6,50v
    PPDCIN_G3H........................................ ...16,50V
    PP3V42_G3H........................................ ....3,425V
    PPVRTC_G3H........................................ ....3,3V
    PP5V_S5........................................... .......5,0V
    PP5V_S4........................................... ......MEASURE 5V AND 0 EACH SECOND. COME AND GO
    PP5V_S3........................................... .....MEASURE 5V AND 0 EACH SECOND. COME AND GO
    PP5V_S0........................................... ......MEASURE 5V AND 0 EACH SECOND. COME AND GO

    PM_SLP_S4_L....................................... ....MEASURE 3,3V AND 0 EACH SECOND. COME AND GO


    ALL THE REST OF RAILS S0 ARE MISSING.....COME AND GO
    PLEASE I NEED HELP WITH THIS LOGICBOARD......THANKS
    Last edited by Carlosqg76; 06-01-2018 at 10:52 AM.

  2. #2
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    Re: 820-4924-a MBP 2015 water damage

    Check for shorts on the S0 rails and also check current/voltage sensing.

  3. #3
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    Re: 820-4924-a MBP 2015 water damage

    pp3v3_s0_fet............short to ground 0.084v diode mode
    ppvvcc_s0_cpu..........short to ground 0.0007v dione mode

    current sensing resistor are fine

 

 

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