820-3437 PPBUS_G3H missing (ISL6259 getting hot)

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  • KappaDev
    Member
    • Feb 2019
    • 41
    • USA
    #1

    820-3437 PPBUS_G3H missing (ISL6259 getting hot)

    I have a 820-3437 logic board taken from a 2012 A1466 Macbook Air.

    No green or orange light on charger. No visible liquid damage. Had aftermarket charger which makes me suspect trashed ISL6259.

    Rails:
    PPBUS_G3H - no present 0V @ 350ohm to GND
    PPDCIN_G3H - 15.14V
    PP3V42_G3H - 3.434V
    SMC_RESET_L - 3.402V
    CHGR_DCIN - 11.85V
    SMC_BC_ACOK - 0.042V
    CHGR_ACIN - 3.963V

    Area around ISL6259 gets warm, but I can't really tell if that is exactly the shorted component as I don't immediately measure any shorts around it. Just want to be sure before I go looking for a replacement.

    Both boardview and schematics are attached.
    Any suggestions would be appreciated. Thanks!
    Attached Files
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4439
      • France
      #2
      Re: 820-3437 PPBUS_G3H missing (ISL6259 getting hot)

      Yes probably dead U7100. You can remove F7140 and check which side is the short on at least.
      If you confirm it's on pin 1 you can remove U7100 and see if resistance goes up.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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