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Macbook pro 13, 820 2879 b, Turn on only with batery

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  • Macbook pro 13, 820 2879 b, Turn on only with batery

    Hey guys,
    At first i have a problem with ppv3v42_g3h, because some liquid damage close to u5010. i clean up and 3v42 came back..
    After i have a prob with =ppbus_g3h, only have 1.4v.
    I take the fuse F7040, and have 1.4v in the same sides(pin1 and pin2).
    i already change u7000 and capacitor c7040..
    the board works fine only with battery.

    any ideas ??

    cumps

  • #2
    Sense resistors R7021/22/51/52 or the traces connecting them to ISL and R7020/50.

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    • #3
      Sense resistors is fine, R7021/22 = 10ohm, 51/52 = 3 and 0.7 ohm.. Traces is ok too.. =(

      sometimes i get 12.6v unstable and then drop to 1.6v.. only turn on with battery and dont charg the battery...

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      • #4
        Must be corroded trace in sense circuit. When PPBUS drops to 1.6V does 3V42 bus stay high?

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        • #5
          ya, i have stable 3v42.. the traces around U7000 appear to be well. if i let the charge on board PPBUS stay on 12V6, unstable but ok..

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          • #6
            What is unstable? With a battery connected it should be stable.

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