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The maintenance of iPhone startup constant current and current jump faults

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In this lesson, we mainly learn how to flash the phone with Aisi Assistant,

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and how to check the error codes when flashing the phone

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Aisi flashing error viewing method

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When iTunes flashes, it will report a numerical error

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For Aisi, we usually look at the flashing progress

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Different progress errors, maintenance methods are also different

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Below we take this faulty iPhone 7 as an example, refresh the machine to check

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After the mobile phone enters the flashing mode, we first connect to the computer,

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and the Aisi software will automatically recognize that the mobile phone has entered the DFU mode

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We click on the flashing page, you can choose to download the system of this model

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Now the system has been downloaded

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We choose one-click flashing,

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choose to flash immediately,

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and choose to confirm flashing

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At this point it will go into the progress bar

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According to the different positions of the progress bar,

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the error is reported, and we can repair it according to the error code

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The progress has been flashed to 16%

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At this time, the Apple logo will be displayed on the screen

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After flashing to 18%, normally it should enter normal mode

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But at this time, it shows that it has entered DFU mode,

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which belongs to the unlimited DFU

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In the case of unlimited DFU, we also repair according to the error code of flashing

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19%, it reports an error

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At this time, we can check the problem according to the error codes

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We open the error code table, when Aisi reports an error at 19%,

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it is caused by the I2C bus, hard disk, CPU, and power supply inductor

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It is the same as the iTunes error 4014

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We learned in previous lessons how to find and measure the I2C bus

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CPU working conditions are CPU power supply, clock signal and reset signal

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If the working conditions of the CPU are normal

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At this time, we only need to replace the power supply inductor of the CPU and the hard disk

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If it is still not normal after replacement,

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it may be a CPU problem or a board layer problem

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We need to replace the CPU with a new bottom of the board

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If the error is still reported, it means that the CPU is damaged

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Ok, that's it for this lesson