IPhone 11 white apple does not boot after restarting (middle layer virtual welding)

IPhone 11 white apple does not boot after restarting (middle layer virtual welding)

An iPhone11 white apple doesn’t start when it is restarted, which is usually caused by external equipment, system, hard disk and middle layer. We can find out the cause of the failure one by one. Find out the reasons and analyze the specific problems. Please see below for content analysis:

[Fault model] iPhone 11

【 Fault Phenomenon 】 White Apple does not boot after restarting.

[Maintenance process] I received a machine sent by a customer for repair, the model is iPhone 11, and the fault is that the white apple does not start when it is restarted.

The customer described it as a sudden automatic restart in normal use, which is generally caused by external equipment, system, hard disk and middle layer, so we can rule it out one by one.

IPhone 11 white apple restarts and does not boot Figure 1

First, the motherboard was removed, and it was found that the single board was still restarted by the white apple. At this time, we first considered the common problem of the iPhone11, the middle-level virtual welding. Many iPhones 11 were repaired before, all of which were restarted by the middle-level virtual welding, so in the second step, we don’t brush the machine first, but layer it directly.

IPhone 11 white apple restarts and does not boot Figure 2

After the upper layer of the layered sheet is powered on, it is found that it can be turned on, which means that the middle layer or the lower layer caused the restart. After dragging the lower layer of tin, it is clamped with a test rack to start the test, and it is found that it can still be turned on normally. It seems that it is the restart caused by the common fault of virtual welding. After the lower layer is planted with tin, it is attached to the upper and lower layers again, and the boot test is normal to enter the system.

IPhone 11 white apple restarts and does not boot Figure 3

[Maintenance Result] Install the motherboard into the shell.mobile phoneIt can be turned on normally, and the functions of WiFi, Bluetooth, voice, charging, fingerprint, taking photos and making phone calls are all normal, so the maintenance is over.