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820-00165 macbook air battery issue

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  • 820-00165 macbook air battery issue

    820-00165 macbook air battery issue, problem is laptop will power on from the keyboard when the mains is plugged in but not when its on battery only, i dont mean the laptop turns on when the mains is connected i mean it turns on via the keyboard when mains connected but not when just on battery , the laptop sees the battery , charges the battery and even runs from the battery if started from the mains supply, im a bit confused and any help would be thankfull

  • #2
    Inspect the trackpad and trackpad flex for corrosion. Have you tried a new trackpad/trackpad cable/keyboard?

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    • #3
      Hi , just tried the board in a known good housing and still the same, i cant see any signs of spillage anyway

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      • #4
        Inspect for corrosion near or under the SMC

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        • #5
          Try battery alone disconnecting LIO flex.
          Do you get 3V42 without charger connected?
          PM_PWRBTN_L reacts when trigger SMC_ONOFF_L?
          First be sure SMC_ONOFF_L has 3V; all tests no charger...

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          • #6
            cant see any corrosion anywhere on this board but reflowed the smc just incase, tried without lio flex connected, i do get 3v42 without charger connected, get 3.3v at SMC_ONOFF_L and PM_PWRBTN_L does get a slight milliamp draw when i short SMC_ONOFF_L, could it be the smc is faulty somehow ???, would it be worth changing it or would it be a waste of time ???
            Last edited by laptopcity; 09-13-2019, 04:38 PM.

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            • #7
              PM_PWRBTN_L should stay low all the time you press power button; or shorting R5115/16 pads.

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