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820-4924 no g3h

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  • 820-4924 no g3h

    liquid damage, the SMC side of the board , close tot the side connectors, all over that place, cleaned, doesn't look that bad, when it came few days ago actually it was working fine, now there is green light on charger, takes 0.01A on 16.5V , i replaced U7100 twice, same issue, here are the measurement for u7100


    1 0
    2 16.3
    3 3.96
    4 3.3
    5 0
    6 0
    7 0
    8 0
    9 0
    10 3.18
    11 2.8-3.4
    12 0
    13 3.3
    14 3.2
    15 0.7
    16 0.7
    17 0.5
    18 0.5
    19 5.4
    20 5.4
    21 0
    22 0
    23 0.6
    24 0.6
    25 7.7
    26 14
    27 16.2
    28 16.2



  • #2
    "6 0
    ---
    12 0"
    Corroded/broken trace; there must arrive 3V42...

    Check resistance to ground at L7330.
    Also check between pins 17/18 and 27/28.
    Last edited by 2informaticos; 09-26-2018, 06:15 AM.

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    • #3
      yeah, near u4600 the pad was gone for 3.4V, fixed, once it turned on with the apple logo, then off, now it wont turn back, but its charging now, takes 2.5A

      is that normal that g3h is 12.5V but with the charging the empty battery it drops to 11.7V ?

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      • #4
        When connect battery, PPBUS_G3H is adjusted to charge it.
        It will come back to 12.5V when battery is fully charged (100%).

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        • #5
          ok

          i put it in the ultrasonic cleaner, now it works fine
          thx

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