iPad 7 A2197 - no power

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  • martyjelen
    Senior Member
    • Mar 2023
    • 127
    • Czech republic
    #21
    Re: iPad 7 A2197 - no power

    I don't have another battery for testing, but I think it's not necessary, since there is a problem with PCB.

      Comment

      • martyjelen
        Senior Member
        • Mar 2023
        • 127
        • Czech republic
        #22
        Re: iPad 7 A2197 - no power

        Here are measurements of charge port connector.

        Attached Files

          Comment

          • martyjelen
            Senior Member
            • Mar 2023
            • 127
            • Czech republic
            #23
            Re: iPad 7 A2197 - no power

            There is also 5V, so connector looks OK i think.

              Comment

              • vahamb
                New Member
                • Sep 2019
                • 2
                • USA
                #24
                Re: iPad 7 A2197 - no power

                Originally posted by elecsoluces
                no power : check first PPBATT_VCC and PPVDDMAIN.
                Inject 4V/3A to PPBATT_VCC and try to boot the device. Report the current draw on your power supply.
                Sorry for jumping in. If I could ask some help figuring out with same model dead. . Plug the charger amps go up hit 1.6 and reset. Nothing on the screen. PPBATT_VCC is fluctuating between 0 and 1.37v. Injecting voltage to PPBATT_VCC 0.68 amps driven from dc power supply, then go down to zero All other rails seem present. Tristar replaced with no positive change. Looks like pmic is getting reset signal but don't know how.
                OP needs cpu reball I think. That's pretty common fault on these.
                Last edited by vahamb; 06-08-2023, 11:28 PM.

                  Comment

                  • vahamb
                    New Member
                    • Sep 2019
                    • 2
                    • USA
                    #25
                    Re: iPad 7 A2197 - no power

                    Originally posted by vahamb
                    Sorry for jumping in. If I could ask some help figuring out with same model dead. . Plug the charger amps go up hit 1.6 and reset. Nothing on the screen. PPBATT_VCC is fluctuating between 0 and 1.37v. Injecting voltage to PPBATT_VCC 0.68 amps driven from dc power supply, then go down to zero All other rails seem present. Tristar replaced with no positive change. Looks like pmic is getting reset signal but don't know how.
                    OP needs cpu reball I think. That's pretty common fault on these.
                    Ended up being bad q8504 on PPBATT_VCC rail.

                      Comment

                      • martyjelen
                        Senior Member
                        • Mar 2023
                        • 127
                        • Czech republic
                        #26
                        Re: iPad 7 A2197 - no power

                        Originally posted by vahamb
                        Sorry for jumping in. If I could ask some help figuring out with same model dead. . Plug the charger amps go up hit 1.6 and reset. Nothing on the screen. PPBATT_VCC is fluctuating between 0 and 1.37v. Injecting voltage to PPBATT_VCC 0.68 amps driven from dc power supply, then go down to zero All other rails seem present. Tristar replaced with no positive change. Looks like pmic is getting reset signal but don't know how.
                        OP needs cpu reball I think. That's pretty common fault on these.
                        So, you think, the CPU is bad? Reballing this is unreal for me, I think. This is bad news. I hope there is some short somewhere, but I didn't find anything yet.

                          Comment

                          • martyjelen
                            Senior Member
                            • Mar 2023
                            • 127
                            • Czech republic
                            #27
                            Re: iPad 7 A2197 - no power

                            I tried to reheat CPU and now the current draw without battery connected is about 0.280A. Still won't power on.

                              Comment

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