IPhone11 can't brush more than 80% (the middle layer is soldered, and the baseband is not recognized)

IPhone11 can’t brush more than 80% (the middle layer is soldered, and the baseband is not recognized)

[Fault model] iPhone11

[Failure phenomenon] The brush machine fails to brush 80%.

[Maintenance process] I received a machine sent for repair by my colleague, the model is iPhone11. My colleague described that the machine was restarted by using a white apple normally. He connected the computer to brush the machine and found that it failed when it reached 80%, so I couldn’t brush it.

IPhone11 can’t brush 80%. Figure 1

After getting the machine, continue to brush the machine for testing, and see what the error code is. The result is still that when the machine is brushed to 80%, the error is reported. When the error is reported, the progress bar fails when it goes to the baseband, indicating that there is something wrong with the baseband, and the machine has not fallen or flooded. We first suspect that it is caused by virtual welding in the middle layer, so we delaminate the motherboard, re-attach it and brush the machine for testing.

IPhone11 can’t brush 80%. Figure 2

When it reaches 80%, it will be brushed directly, and then it can be activated into the system normally.

IPhone11 can’t brush 80%. 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.