How to fix iPhone SE battery drains quickly after water damaged

This iPhone SE got litter water in it, and then test it, all is fine except battery drained fast. However, the battery issue can cause inconvenience when using iPhone SE. So, we need find the reason and fix it.

Disassemble the iPhone SE, and plug a adjustable power supply to offer power supply to motherboard. The standby current is 50mA, which suggests that there is electric leakage. After removing the PP_VCC_MAIN voltage and its Q2300, the problem remains the same. So the electric leakage does not come from PP_VCC_MAIN voltage. Q2300 in circuit diagram is shown in picture 1-1.

 

1-1

Then, checking the circuits that connect battery power supply, we find that the power amplifierchip at the lowest part of board has been watered. Plug a adjustable power supply and the standby current is normal. Replace the power amplifier power supply chip and test. It can be turned on and electric leakage disappears. The material object of the Q2300 on motherboard is shown in picture 1-2. The material object of the power amplifier power supply chip on motherboard is shown in picture 1-3.

 

1-2

 

1-3

Finally, the battery of iPhone SE is back to normal and you can play it with confidence. In the end, kindly tips, please keep your phone away from the water.