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The maintenance of iPhone startup constant current and current jump faults

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In this video, we mainly explain how to view the error code of flashing

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First of all, when we flash the phone, we will choose different software,

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we may use iTunes, or we may use Aisi

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The error codes of these two softwares are different, how can we check them?

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Let's first look at the iTunes

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First, we need to check the progress bar of the flashing

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Because of the error codes that appear in different progress when flashing the machine,

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the maintenance methods are different

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For example, error 9 is reported at the third waiting point when flashing,

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and it is also reported when the software is being restored

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When it comes to restoring the firmware,

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or verifying the restoration, error 9 is also reported

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At this time, we want to determine which component caused the flashing error

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We need to check the maintenance direction according to the progress and error code

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Let's look at the flashing error of this faulty machine

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First, after the mobile phone enters the mode,

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connect it to the computer, and open the flashing software in the computer

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The status of the phone can be recognized by the flashing software,

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and the prompt shows that the serial number of the model is not applicable

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It means that the phone has entered DFU mode

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If it is in recovery mode, we can see the serial number

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We press the shift key,

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click restore,

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and then release the keyboard

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At this time, we can choose the system corresponding to the model

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If we choose wrong, it will prompt firmware incompatibility error

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After we select the correct system, click restore

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When preparing to restore, it directly prompts error 3194,

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and the mobile phone does not display the white apple icon

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In this case, it is generally a problem with the battery,

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data cable plug, network firmware, etc.

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Let's check to see if the system has expired

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Let's download the latest system of this model, and then try flashing it again

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We re-download the new system, let's try it

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This time there is no error message,

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it seems that the error just reported is a system problem

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Let's continue to wait for the flashing to see if there will be other questions

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The first one is waiting for the iPhone

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Preparing iPhone to restore from backup

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At this time, we can see that the Apple LOGO icon can be displayed on the screen

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the second waiting

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Software error 4014

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This kind of situation is generally caused by problems such as external components, I2C bus,

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hard disk, CPU, supply inductor, etc.,

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or because the working conditions of the CPU are not satisfied,

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and finally the CPU itself may be damaged

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At this time, we need to overhaul these lines

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We learned about the I2C bus lookup and measurement method in the previous lesson

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CPU working conditions are CPU power supply,

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clock signal and reset signal

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If the previous working conditions are all right,

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we can replace the power supply inductor of the CPU

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After the inductor is replaced, if it still doesn't work,

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we will replace the hard disk

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If it's still abnormal, it's basically a problem with the CPU

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We need to judge whether the CPU is damaged by moving the board

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Ok, that's all for this video