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HELP! iPhone 5s keep restart after LCD screen replacement

When replace the iPhone 5s LCD screen, many iPhone 5s have a bad reaction,  the most common phenomenon is that iPhone 5s keep restarting when it show white Apple. 


According our experience, this faulty was caused by installing wrong screw when replace the LCD screen, and maybe the motherboard was broken down. How can we solve it? 

First, power off the device and remove the motherboard, we can see the screw  column is damaged when observing with the microscope, there are traces of being pierced. As shown in picture 7-9-2 and 7-9-3.



Continue to scrape the motherboard layer, there are four wires were interrupted. As shown in picture 7-9-4.



So we connect the broken wires one by one, and then make green oil solidification. As shown in picture 7-9-5.


Power on to test, it still reboot with the same symptom, replace U6 and U2 chip, fault is still as before, and the iPhone device reports error 9 at the last, as shown in picture 7-9-6.



Finally, we remove the iPhone 5s NAND and reball it again with corresponding reballingstencil.

Finally, the iPhone 5s can boot normally, the bad reaction is gone.



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