iPhone 11 restarts once every three minutes for troubleshooting

IPhone 11 is restarted once every three minutes. The pin solder is very little when observing the battery holder under the microscope. The test will not be restarted after the tin is replenished. After it is left for several hours,mobile phoneStill occasionally restart, refer to the maintenance instruction on Xinzhizao Soft, find the fault and repair it perfectly.

iPhone 11 restarts once every three minutes for troubleshooting.

Machine model: iPhone 11.
Malfunction: after the customer replaced the back cover glass, iPhone 11 restarted once every three minutes, the customer replaced the battery holder, and welding passed the upper and lower layers.
Actual measurement: It is really less than 3 minutes to restart after the pick-up.
Maintenance method:
First of all, exclude the places repaired by customers, observe that pin solder is very little in the inspection of battery holder under microscope, and the test will not be restarted after the tin is replenished. After being left for several hours, it is found that, mobile phoneIt still restarts occasionally, so I removed the upper layer and found that welding at I2C3 position on the motherboard was defective. After re-observing welding, I observed it again. After a period of time, I still restarted occasionally. I checked the restart log and combined with the maintenance instructions on Xinzhizao Soft. Finally, I replaced charging connector FPC to solve the fault. After testing, I did not see any restart in one day. At this point, the iPhone 11 restarted once every three minutes to repair the fault.