When your iPhone 6S accidently dropped into
water, then shows dark screen and cannot turn on. Do you need to buy a new
phone? No! There is a better idea here. Fix it!
1. Disassemble the iPhone 6S, we can found
that the motherboard’s large area is water damaged. There are bumps on the upper board
of CPU. After measuring, we find that the power supply of upper board is not
short circuit. Connect the iPhone 6S to DC powersupply, the standby current shows about 0.24A, as shown in
picture 1.
2. Use multimeter to
measure the diode data of PP_VCC_MAIN, the diode data is small,only several
tens. After observing, we found that the capacitor near Wi-Fi chip
darkens badly. Its material object is shown in picture 2.
3. Remove the damaged capacitor and now the
diode data of PP_VCC_MAIN is more than 100mA. As the water-damaged area is
large, after observing carefully, we find that a capacitor at audio IC darkens badly too. Its material object is shown in picture 3.
3
4. Remove it and now the diode data of
PP_VCC_MAIN is more than 300mA.Connect DC power supply and the standby current
becomes more than 30mA.Each power supply circuit is not short circuit. We can
feel that the upper part of the circuits is hot when plugging power supply.
Thus, put rosin at upper part of the circuits and wait it melt slowly, finding
that the rosin at circuits of display screen power melts faster than other
parts. The location of display power chip in bitmap is shown in picture 4.
4
5. Tear down the display screen power chip
and connect power supply. The standby current recovers to normal 0, as shown in
picture 5.
5
6. Replace display screen power and the IC
recover. Finally, iPhone 6S can boot normally and can back to normal work.
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