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iPad Air 2 reboot problem: why is that and how to fix

Did you met the iPad Air 2 3G version reboots after being used for a while, and you have no idea what's going on. Don't worry, you can get rid of it, because the Vipprog wrote a solution to this problem

Firstly, try to turn on the iPad Air 2.It has no response when pressing the power button and it can be turned on after inserting USB cable. Enter system and battery percentage is 100%. It shows “is searching” when being inserted SIM card and it turns off when plugging USB cable. Now press the power button and it has no response. According to the trouble phenomenon, there are two problems. One is the USB chip that must have something wrong. The USB chips of iPhone and iPad have greater chance to be broken. The other is that iPad does not recognize. So we doubt about the 3G part. Then teardown iPad and measure it, as shown in picture 1-1.
1-1

Then, remove the motherboard and measure the diode data of each testing point of USB chip with multimeter, finding no problem. Next measure the capacitors of each supply power circuit on motherboard to check whether there is any short circuit. When testing the RF part, we find that RF amplifier IC of 3G function circuit has burn mark, as shown in picture 1-2.
1-2

Third, using HOT AIR GUN to remove power amplifier chip , as shown in picture 1-3, and clean the solder pad. Test the power on and off function and they are normal. Battery displays 56%. Charging it and testing it for several days, we find it is still normal. But as the amplifier chip is damaged, iPad displays no service when inserted SIM card. If you don’t use this function anymore then you can ignore the problem.
1-3

Finally, assemble the iPad and test. After it can enter the system normally, the problem is solved, and the iPad Air 2 can back to normal work.

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