Tutorial: iPhone 6S unable to boot after fell into water

Last week, we went to the seaside to play, unfortunately, my iPhone suddenly fell into water, even if I picked it up quickly, but the iPhone 6S still unable to boot. When i back to home, i try to fix it by myself, luckily, i did it, the tutorial is as follows.

First, we need to prepare some phone fix tools.

- WL Aluminum Alloy Pad

- phone opening tools

- digital multimeter

- DC power supply

- microscope

- WUXINJI Dongle

- QUICK 861DW

- Others

Now, let's get started.

Use phone opening tools to disassemble the iPhone 6S, carefully take out the iPhone motherboard, clean up the water area of iPhone motherboard.

Observe the iPhone motherboard, we found the upper of the iPhone CPU is deformed, measure it with digital multimeter, the iPhone CPU upper doesn't shorted.

Connect iPhone motherboard to the DC power supply, the stand-by current is about 0.24A. Measure the diode data of PP_VCC_MAIN, the data tested is lower than the normal value.

Put iPhone motherboard under the Trinocular Integrated Microscope to check, we found the capacitor next to the iPhone WIFI IC was seriously blackened.

Open the WUXINJI Dongle to check iPhone schematic diagram, so we can know the physical position on the iPhone motherboard.

Remove it directly, and then measure it again, now the data tested has more than 100, and the stand-by current tested also is more than 100mA.

Carefully observe the iPhone motherboard again, we found that there is a capacitor next to the iPhone audio IC also was seriously blackened. Remove it directly, and then measure it again, now the data for PP_VCC_MAIN is more than 300, and the stand-by current turns to 30mA, but the upper part of the iPhone motherboard is slightly hot.

Use rosin method to find out the faulty part, we found the temperature of the iPhone display power part is higher than others.

Use QUICK 861DW rework station to remove this iPhone display power IC, and then connect iPhone motherboard to the DC power supply to measure it, now the stand-by current is back to normal.

Install the new iPhone display power IC, and then assemble the iPhone 6S.

Press the iPhone power button, the Apple logo appears smoothly, after few seconds, the iPhone gets into IOS system successfully.