iPhone 5 bootlooping

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  • Jenzo
    Senior Member
    • Jul 2019
    • 135
    • Belgium
    #1

    iPhone 5 bootlooping

    Hey everyone,

    Working on an iPhone 5, came in for data recovery.

    Phone booted straight into recovery mode, connected it to 3uTools, used "exit recovery mode", and since then it just bootloops. I get the Apple logo, after a good 5 to 10 seconds, then power gets cut and the logo fades.

    Took it out of the housing, only battery, chargeport and screen connected, same issue. took off the heatshield to measure a bit, but I'm not experienced with iPhone 5 so no clue what to check first.

    With a thermal cam I could see L2 heats up to about 45c, and sometimes the U7 chip next to get get a little heatspot close to it. Connected to a power supply it never draws more then 0.29a.

    Where do I go from here? What should I measure? Thanx in advance!
    Tags: None
    • Jenzo
      Senior Member
      • Jul 2019
      • 135
      • Belgium
      #2
      Re: iPhone 5 bootlooping

      Could someone tell me what the regular resistance to ground on PP_VCC_MAIN should be by any chance?

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13887
          • Canada
          #3
          Re: iPhone 5 bootlooping

          Review the first post here:

          https://www.ifixit.com/Answers/View/...+then+restarts

            Comment

            • Jenzo
              Senior Member
              • Jul 2019
              • 135
              • Belgium
              #4
              Re: iPhone 5 bootlooping

              Hey! Thanx for the reply, I've checked the area and everything is present. The board is pretty much in mint condition, except for me removing the heatshield.

                Comment

                • tiny13
                  Member
                  • Jul 2022
                  • 17
                  • russia
                  #5
                  Re: iPhone 5 bootlooping

                  Originally posted by Jenzo
                  Hey! Thanx for the reply, I've checked the area and everything is present. The board is pretty much in mint condition, except for me removing the heatshield.
                  Hi. you need to check tristar (u2) thermal camera.

                    Comment

                    • Jenzo
                      Senior Member
                      • Jul 2019
                      • 135
                      • Belgium
                      #6
                      Re: iPhone 5 bootlooping

                      Under the thermal cam only the L2 is getting hot, and the U7 a little bit. The tristar doesn't seem to heat up. Also the tristar tester gave no issue.

                        Comment

                        • mon2
                          Badcaps Legend
                          • Dec 2019
                          • 13887
                          • Canada
                          #7
                          Re: iPhone 5 bootlooping

                          https://forum.gsmhosting.com/vbb/f63...ts-up-1872638/

                          Do you have schematics for this phone you can post here?

                          Remove all power and battery.

                          Meter in resistance mode.

                          What is the resistance to ground of this L2 inductor?

                            Comment

                            • Jenzo
                              Senior Member
                              • Jul 2019
                              • 135
                              • Belgium
                              #8
                              Re: iPhone 5 bootlooping

                              I came across that forum post, there they measure a short, as far as I can tell I don't have a short.

                              I'm working in ZXW so I don't think I can share The boardnumber of the schematic I'm working of is 820-3141-B.

                              Resistance is 0.168 to ground.

                                Comment

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