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The maintenance of iPhone startup constant current and current jump faults

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In this lesson, we mainly explain how to connect an iPhone to a computer

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There are two ways to connect your phone to your computer

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The first method is to plug in the data cable after the mobile phone is turned on,

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click trust on the screen, and enter the password to connect to the computer

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The second method is to enter the flash mode

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There are two Apple flashing modes,

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recovery mode and DFU mode

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Only after entering the flashing mode, we plug in the data cable,

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can the computer recognize the mobile phone

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If the mobile phone has a constant current when it is turned on,  

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current jumps, stuck white apple or white apple restart, etc.,

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after plugging in the data cable,

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the computer cannot recognize the mobile phone.

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So at this time, if we want to see the error report of the flash machine,

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we need to enter the recovery mode or DFU mode

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If the current of the mainboard is within 200mA after booting,

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we may not be able to enter the flashing mode through method 1 and method 2

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We need to use method 3 and method 4

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If none of the above three methods can enter,

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then we need to remove the hard disk on the mainboard

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After removing it, plug in the data cable to see if it can be connected

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Apple's full range of models will automatically enter DFU mode after removing the hard disk

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And the boot current is set at about 50mA

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Let's take the iPhone 7 as an example to illustrate

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If you can't get in through the above methods,

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you need to remove the hard disk

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After removing the hard drive, let's connect to the computer again

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The mainboard is connected to an adjustable power supply,

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and we plug in the data cable, and the current does not jump,

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which is an individual case

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Because in 90% of cases,

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the iPhone will be turned on after plugging in the data cable

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There is no current after we plug in the data cable,

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we need to press the switch first

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The current will be set at about 50mA,

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we will plug in the data cable at this time

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The computer will show that it has entered the DFU mode,

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and we can go to flash the machine

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After removing the hard disk from the mainboard,

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the progress can be refreshed to about 20%.

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If we only brush to 11% or 19% in the process of flashing

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At this time, we can also repair according to the error code

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If after we remove the hard disk, the computer is still not connected,

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it may be that there is a problem with the connection circuit of the mainboard

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and we need to repair the connection circuit

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If the iPhone cannot be connected to the computer after the connection circuit is repaired,

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there may be a problem with the CPU

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Ok, that's all for this video