After the iPhone 6 Plus fell, it have some
problem, it always restarts itself. When we root it, it shows unknown error 9.
If you want fix it, and then you can follow the following steps to repair it.
1.
Disassemble the iPhone 6 Plus, remove the CPU. Because if dropped
iPhone reports unknown error (9), mostly the CPU pins connected with logic
board are missing. Measure U16X eeprom chip,
finding it is pseudo soldering. Solder
CPU and jump wires, as shown in picture 7-36.
2. Get into IOS and test it, the screen is
blurred sometimes. Check display circuit and we find that display power supply
PP5V7_LCM_AVDDH near display screen FPC socket is abnormal. PP5V7_LCM_AVDDH is output by chipU1501, as shown in picture 7-37. At U1501’s peripheral capacitor
C1569, I measure its output voltage. The voltage is normal. The location of
C1569 on motherboard is shown in picture 7-38.
We can't find any voltage at C2071. U 1501
outputs PP5V7_LCM_AVDDH and transmits it to display socket passing by FL2037,
as shown in picture 7-39.
Measure inductor FL2037 and it is workable.
The location of FL2037 on motherboard is shown in picture 7-40.
3. Thus we can be sure that motherboard is disconnected somewhere. Jump a wire to connect the disconnected
place, as shown in picture 7-41 and 42.
4. After jumping the wire, turn on the
iPhone, it can enter the IOS normally, the problem has been solved. The iPhone
6 Plus back to health.
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