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Solved: iPhone 6 won't turn on after dropping to water

This iPhone 6 dropped into water, we picked it up as soon as we can, but the iPhone 6 still was damaged, it won't turn on.  When we press the iPhone power button, the iPhone 6 just keep black screen, it doesn't respond. We need to solve this problem.



Use screwdrivers to remove the 2 screws that next to the iPhone lightning port, and the put iPhone on the CPB screen separator.  After a while, we can open the iPhone screen and remove it.

Disconnect the iPhone battery, and then measure the iPhone motherboard with DC power supply, trigger it, the boot current stuck on 510mA, which is abnormal.

Remove the iPhone display assembly and take out the iPhone motherboard. Put iPhone motherboard under the microscope to observe, we can see that there are many moldy traces on the motherboard.

Clean up the iPhone motherboard with PCB cleaner, and then connect the iPhone battery with DC power supply, use tweezers to power up, the boot current stuck on 220mA, which is still abnormal.

Attach the iPhone motherboard to the PCB holder fixture, remove the CPU shielding plate,  we can see that the U1501 and U1503 have moldy traces. Use QUICK 861DW hot air rework station to remove them.

Next, remove the U2402 and U0900, we find the area under the U2402 has got seriously mildewed, we suspect the problem was caused by this part.

Apply some solder paste to the solder pad, and then use soldering iron tip to remove the tins, clean it with PCB cleaner, and then install the new IC.

Now install the U1501 and U1503 to the iPhone motherboard with same methods, and then measure the boot current again, now the data tested is normal.

So, install the iPhone, and then press the power button, the Apple logo appears normally, and then it accesses to the IOS system. Test the iPhone functions, all functions tested are normal.

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