Analysis and Solved: iPhone 6 doesn't boot failure

The iPhone 6 doesn't boot, which means all functions on iPhone cannot be used, it lost its original value. Now, two choice, one is abandon it and buy the new one, the other one is fix it by phone repair tools. The first choise is easy, but i think many users want fix their iPhone. So, after analysis the reasons, we privide the defferent methods to solve it.

Analysis

There are mianly two reasons can cause iPhone 6 doesn't boot failure

1. iPhone circuit is shorted

Measure the iPhone 6 current by DC power supply, if it has leakage or large current alarm phenomenons, then it must be one of the PP_BATT_VCC and PP_VCC_MAIN has short circuit failure; if there is no power leakage when supplying power, but it will get leakage or large current once pressing the power button,then it must be one of the circuit on output voltage of power IC is shorted.

2. some iPhone chips is damaged

Damaged iPhone USB control IC cann cause iPhone 6 stuck on White Apple logo and doesn't boot; damaged iPhone compass IC can cause iPhone reports iTunes error 4013 and doesn't boot; damaged iPhone Nand flash can cause iPhone stuck on blue or red screen and then keep restarting; damaged iPhone CPU can cause iPhone 6 stuck on 100mA and doesn't boot. Damaged NFC module or baseband power can cause iPhone reports iTunes unknown error 56.

Solved

1. Use multemeter to measure the diode data of iPhone cirucit to find out the short-circuit line, and then use rosin method to locate specific short-circuit parts, after find it, just remove it.

2. Put iPhone motherboard under the 7-45X Trinocular Stereo Microscope to check, whether there are obviouly scar, and then measure the step-by- step, if the iPhone IC is damaged,first you can try to fix by re-installing, if not working, then you can replace the new on.