Apple iPhone 6 won't turn on (dead) -- what to do?

Apple iPhone 6 won't turn on,  it is dead.  So sad for the users, becasue they can't use it if the iPhone won't turn on.  However,  perhaps your iPhone 6 still can be saved, what to do? 

Check iPhone circuit diagram on WUXINJI Dongle, so that we can know the working principle for iPhone 6, and then we can fix it easily.

iPhone Motherboard Short circuit

1.  There is a short circuit issue on PP_BATT_VCC or PP_VCC_MAIN

First measure  the diod data of  PP_BATT_VCC or PP_VCC_MAIN with multimeter, it's abnormal.  Then use rosin method to find the specific short-circuit position. After find the short circuit capacitor, you can remove it by Precision Titanium Tweezers.

2. There is short circuit on output voltage of power IC

Respectively measure each output of the bypass capacitance measurement resistance, find the short circuit parts.  And then use rosin methods to find the specific short-circuit position.After find int, remove it by tweezers.

Damaged IC

1.  if  the USB control IC is damaged, it will cause iPhone 6 stuck on White Apple logo and won't turn on.  Measure the iPhone USB control IC, if it is damaged,  you can replace the new one.

2. if the compass IC is damaged, it will cause iPhone reports unknown error 4013 and won't turn on. After measurement, you can replace it the new one.

3. If the iPhone Nand flash is damaged, it will cause iPhone blue or red screen and then auto restart. After measurement, you can use weld the U0301 first, if not working, then you can re-install or replace the iPhone NAND flash.

4. If the CPU is damaged, it will cause iPhone stuck on 100mA and won't turn on.  Connect iPhone to PC, if it can't identify the hardware, which means CPU not working, re-install or replace U1202; if it can indentify the hardware, try to flash it with iTunes, if the it reports iTunes error 4005/4014/14/40, then basically it is CPU  or iPhone Nand flash error, you can re-install or replace it.

4 Steps To Fix iPhone 6 Won’t Turn On Issue

The iPhone 6 has been dropped heavily, and then the iPhone won't turn on and overheating. Now we need to repair it step by step.

Step 1

Disassemble the iPhone 6 by JM-P01 Essential Toolkit, take out the iPhone motherboard and measure it with DC power supply, it shows large current when booting, about 1300mA.

Step 2

The boot current shows about 1300mA, which is abnormal. Put the iPhone motherboard under a VGA Camera 7-45X Trinocular Stereo Microscope to observe it carefully, we found the culprit on the motherboard. There is a capacitor has been penetrated, which caused the iPhone to turn on with an abnormal large current phenomenon.

Step 3

Now, we've decided to dismantle this capacitor. With the help of Hot Air Gun and Precision Titanium Alloy Tweezers, we succeeded in tearing down this capacitor. Using Fluke 15B+ Digital Multimeter to measure it, the diode data shows more than 300, it is normal. This circuit is iPhone Nand flash power supply 3V, PP3VO_NAND short circuit will causes iPhone won't turn on, and the boot current up to 1000mA.

 

Step 4

After removal, measure it again with 1503D+ DC power supply, the boot current is normal now. Install the iPhone well, and the press the iPhone power button to turn it on, now the iPhone 6 can turn on normally and smoothly into IOS.