The maintenance of iPhone startup constant current and current jump faults

In this video, we mainly explain the precautions after flashing

Note 1

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

The CPU will self-test through each bus,

but sometimes it will fail

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

Causes of restart failure include CPU, hard disk cover,

audio, WiFi, and inductors near the CPU

These will cause repeated restarts after flashing the machine

Note 2

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

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

If we use the flashing cable to flash,

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

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

it will automatically enter the flashing mode

Note 3

After flashing the machine,

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

it will restart infinitely after restarting

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

We can replace the audio or WiFi chip

Note 4

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

After a while, or before it enters the system,

there is a blurred screen problem

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

We need to replace the GPU power supply inductor

Problem that may occur when flashing machine with adjustable power supply

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

but use an adjustable power supply to flash the machine

When flashing with an adjustable power supply,

there will be some other situations

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

This is because the CPU cannot read the battery data,

and it will restart after 2 minutes

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

It restarts before the progress bar finishes

In this case, we can buckle up the battery

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

there will be no problems during the flashing process,

but after the flashing and self-test are completed,

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

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

In this case, we can install the battery back

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

but it can be encountered occasionally

Ok, that's it for this lesson