Solved: iPhone 7 won’t boot after fell into water

The iPhone 7 accidentally fell into water, and the iPhone 7 won't boot anymore. According to our experience, we think there are the problems with iPhone motherboard, we need to fix it.

Disassemble the iPhone 7, and then test it with DC power supply, the current is 900mA, which is leakage, and the iPhone is not turning on.

Next remove the iPhone motherboard, put it under the Stereo Zoom Microscope to observe, finding that the capacitor C2307 was cracked, and 2 iPhone big audio IC under it have been corroded.

Remove the C2307, and then cleaning up the corrosive place. Measure the iPhone with DC power supply again, it leaks 100mA, but the iPhone can be turned on. After entering the IOS, we found the iPhone vibration and voice are not working.

Remove both 2 piece iPhone big audio IC, and then use digital mutimeter to measure the diode data of the U3402 A2 pin, the data tested is 30, which is abnormal.

After checking iPhone schematic diagram on WUXINJI Dongle, we know that there only M2800 is connected with A2 pin.

Remove the M2800, and then install the new one. After replacement, the data measured is normal now.

Next replace these 2 pieces iPhone big audio IC, and then measure the iPhone, now there is no leakage.

Assemble the iPhone, press the iPhone power button, the iPhone can be turned on properly. After entering the IOS, test the vibration function and voice function, they all works well.