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Troubleshoot: iPad Air 2 Touch Screen not working

The iPad Air 2 can turn on, but when we touch the display screen, it has no response.  Now, Vip Pro Shop Team provides a solution for you.
1. Measure the iPad touch power supply, however, we can't find PPVDD_STINGER_BOOST voltage.

PPVDD_STINGER_BOOST bitmap position of iPad as shown in picture 8-8-1.


PPVDD_STINGER_BOOST iPad circuit diagram  as shown in picture 8-8-2.



2. Diode value of L4001 inductor cannot be found when measuring with multimeter. As shown in picture 8-8-3.



3. So we have to replace a new L4001 replacement parts. In order to ensure the stability of the iPad, after replacing the L4001, by the way, D4001, C4014 and C4017 are replaced together. As shown in picture 8-8-4.



4. Connect and reboot the iPad Air 2 to measure the value again, we find PPVDD_STINGER_BOOST shows 20V voltage now. As shown in picture 8-8-5.



Finally,  assemble iPad and test it, the touch function now back to normal, you can touch the LCD screen freely. The iPad motherboard was repaired!




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