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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 the precautions after flashing

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Note 1

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After the phone is flashed, the phone will restart and enter the progress bar again

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The CPU will self-test through each bus,

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but sometimes it will fail

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If the self-test fails, it will cause repeated restarts

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Causes of restart failure include CPU, hard disk cover,

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audio, WiFi, and inductors near the CPU

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These will cause repeated restarts after flashing the machine

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Note 2

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After flashing the machine, it will automatically enter the recovery mode

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In this case, there is usually a problem with the hard disk

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If we use the flashing cable to flash,

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after flashing, we have to unplug the cable first and then turn on the machine

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If you plug in the flashing cable and turn it on,

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it will automatically enter the flashing mode

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Note 3

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After flashing the machine,

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if the mainboard can enter the system normally for the first time,

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it will restart infinitely after restarting

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This kind of failure is usually caused by the audio or WiFi problems

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We can replace the audio or WiFi chip

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Note 4

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After flashing the machine, if it can run normally for the first time when it is turned on

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After a while, or before it enters the system,

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there is a blurred screen problem

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This kind of failure is generally caused by a problem with the inductor of the GPU power supply

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We need to replace the GPU power supply inductor

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Problem that may occur when flashing machine with adjustable power supply

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In actual maintenance, sometimes we may not install a battery,

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but use an adjustable power supply to flash the machine

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When flashing with an adjustable power supply,

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there will be some other situations

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For example, after flashing the machine, it will restart if the progress bar is not finished

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This is because the CPU cannot read the battery data,

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and it will restart after 2 minutes

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It takes about 3- 4 minutes for the progress bar to finish after flashing the machine

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It restarts before the progress bar finishes

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In this case, we can buckle up the battery

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Some mainboards, when we flash with the adjustable power supply,

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there will be no problems during the flashing process,

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but after the flashing and self-test are completed,

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when we use the adjustable power supply to turn it on,

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it will prompt that the temperature is high, and generally the battery is not detected

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In this case, we can install the battery back

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This kind of situation does not appear much in actual maintenance,

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but it can be encountered occasionally

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Ok, that's it for this lesson