Sometimes, the
drop of iPhone is inevitable, if you are lucky, your iPhone can continue to
work properly. Conversely, the iPhone can't work. When you face the back of
that situation, please don't worry, this article will help you.
Trouble Phenomenon
Then iPhone 6 fell to the ground, we pick
it up and turn it on, it shows white apple and then restart, when we root it,
it reports unknown error 4005. The NAND flash has been solder, and there are jumped
wires at logic NAND FLASH IC , as shown
in picture 7-48.
Resolution Steps
1. Root the iPhone 6, enters the DFU mode.
After it is rooted, it reboots. Then it standbys until it reports unknown error
(4005). Usually, faulty NAND FLASH, CPU
upper board and disconnected motherboard would cause such problems.
2. Use multimeter to
measure the diode data to ground of chip. The data is normal. After tearing the
NAND FLASH, measure the diode data to ground that NAND FLASH use it to
communicate with CPU. The data is normal too. Replace the NAND FLASH and root.
The problem is still the same.
3. Solder CPU again to root. The problem is
still the same. Tear the NAND FLASH again and measure its diode data to ground.
I find that a solder pad is pseudo soldering. Using diode pole of multimeter to measure, if I press hard, the
probe will show resistance data. The pseudo soldering pins are shown in picture
7-49. In this case, we can be sure the board is faulty.
4. Find the pins that connect CPU. and then jump a wire from CPU
solder pad to the solder pad of NAND FLASH, as shown in picture 7-50 and 51.
5. After jumping the wire, assemble CPU and
put motherboard on assembly to root. It now shows progress bar, as shown in
picture 7-52. When root finishes, it can get into IOS. After testing, all the
functions are normal. The iPhone 6 can work normally again.
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