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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,

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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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Method 3 is to force DFU

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At the point where the DFU is forced, connect a 1.8V or 3V thin wire,

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and then insert the data cable, you can connect to the computer

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Because the location of the forced DFU point of each model of iPhone is different

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We can find maintenance materials in Xinzhizao self-study tutorials and mobile phone tutorials,

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including iPhone's forced DFU signal and test points

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Let me take the iPhone7 model as an example to demonstrate

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We first find the forced DFU test point of iPhone 7

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This is the forced DFU signal point name of iPhone 7,

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we can also query it through the drawing

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This is the forced DFU test point name for Apple models

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The test point for the iPhone 7 has a small dot on the mainboard

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We need to connect it to a 1.8V or 3V power supply

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We need to use bitmap to find the voltage

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Open the bitmap of the iPhone 7 and find the corresponding forced DFU test point

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Let's see if there is a 3V or 1.8V power supply near it

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There is a 3V photosensitive power supply here

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At this time, we can short the test point and this end of the capacitor

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After shorting, then plug in the data cable, we can enter the DFU mode

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Let me demonstrate

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We short-circuit the test point of the forced DFU and the photosensitive capacitor next to it

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we have shorted

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Let's test it next

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First open the flashing software,

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plug the data cable into the computer

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When the mobile phone is turned off,

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connect the adjustable power supply and insert the data cable

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The computer can quickly recognize that the phone has entered DFU mode

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After entering the DFU mode,

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the screen will not display the picture

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If we go to flash the machine at this time, there may be an error reporting problem,

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we need to disconnect the connection cable before flashing the machine

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Because it is more troublesome to disconnect the flying wires later,

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I am used to using tweezers to short-circuit them

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After entering the mode, release the tweezers and you can flash the phone

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Why disconnect the line of forced DFU?

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Because a good machine will also report an error when forcing DFU to flash the machine

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After we disconnect, if the error is reported again after flashing,

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we can repair according to the error code of flashing

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So, that's all for this video