Any digital electronics experts? Need help with iPhone 6s

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  • caphair
    Badcaps Legend
    • Nov 2011
    • 1249
    #1

    Any digital electronics experts? Need help with iPhone 6s

    I'm trying to diagnose an iPhone 6s that's stuck in a boot loop. iTunes error points to a baseband issue.

    So I've compared to a known working board and found that the PMU_TO_BB_PMIC_RESET_L line (at Resistor R2200) should be high at 1.8v but when I measure it's very momentary high then quickly drops and stays low at 0v

    Tracing the line it's an out from the GPIO section of the main power ic for the entire phone

    I have no other literature or information on how the circuit's supposed to function so I'm here asking to hopefully gather any information that may help me determine what's going on

    If GPIO outputs are software controlled then I need to figure out what parameters are causing it to go low and stay low
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    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30919
      • Albion
      #2
      Re: Any digital electronics experts? Need help with iPhone 6s

      does the board have a serial port?
      the iphone3/4 did.

      i'm just wondering - as it's running BSD if it outputs text as it boots.

        Comment

        • caphair
          Badcaps Legend
          • Nov 2011
          • 1249
          #3
          Re: Any digital electronics experts? Need help with iPhone 6s

          I don’t think so I don’t see any

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