IPAD A1673 power constantly resetting

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  • AlexVG
    Senior Member
    • Apr 2022
    • 138
    • SPAIN
    #1

    IPAD A1673 power constantly resetting

    Hello. I came across with the power supply constantly resetting on IPAD A1673.
    (I connect it to USB power)
    PMU U8100 is rising all voltages except PP3V3_S2 . Consequently, the SYS_ALIVE is also absent.
    I have two identical boards with the same symptoms, and I think this is a common problem.
    I also have a working board. I've taken all the measurements to compare and haven't seen any abnormalities. There are no signs of a short circuit or water damage.
    VREF, IREF are also present.
    I also couldn't find any PP3V3_S2 enable signals.
    Please help me and suggest what the problem might be.
    Thank you
    Last edited by AlexVG; 09-24-2025, 05:28 PM.
    Tags: None
    • reformatt
      Badcaps Legend
      • Feb 2020
      • 1456
      • Australia
      #2
      I haven't worked on iPads for a long time, but IIRC, iPads will boot loop without the battery gas gauge data or missing voltage from the battery.

      Don't know about the more recent models. I don't work on anything these days held together with glue 🤣

        Comment

        • AlexVG
          Senior Member
          • Apr 2022
          • 138
          • SPAIN
          #3
          Hi,
          Thank you for the reply.
          But that's not it.
          My test mainboard boots without a battery.
          At the least, it should read the NAND. But it doesn't get to that point because there's no voltage on the NAND (3.3V)
          Last edited by AlexVG; 09-24-2025, 07:16 PM.

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