We received an iPhone 6 V version device, according from the owner: It got water in, we find there is electrical leakage when connecting it to electricity, which triggers large current. Here we will introduce the details of the fault maintenance, hope it will help you!
Motherboard waterproof stickers changes into red, indicating that the motherboard got into the water, the
power supply shows leakage 31mA when electricity is connected. As shown in picture 4-4-1.
This kind of fault is usually caused by chip damage after water inlet, measuring each power supply is normal value, measuring the
data cable of the 12C0 to the ground value is only 002, as shown in picture 4-4-3, indicating that the 12C0 is short-circuit to the ground, the normal value should be about 400.
Combining the above phenomenon, the fault target is locked in the U1602 flash power supply IC, U1503 fingerprint power supply IC, U1501
display touch IC, U1502 backlight power supply IC. We can see there is a little oxidation around U1501, so remove it immediately then measure 12C0 to the ground value is 352 (after board gets cool only about 400), as shown in picture 4-4-4.
Connecting
multimeter, leakage current is only 001, indicating that after the demolition of U1501, there is no longer leakage of electricity, change a U1501 chip and then boot, the current normal jump, the screen shows white apple, so here we succeed in iPhone 6 motherboard maintenance. As shown in picture 4-4-5.
If you need more cell phone maintenance resources or machines please ask help for www.vipfixphone.com
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