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.
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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