Tuesday, August 8, 2017

6 steps to fix the iPhone 6S cannot turn on after water damaged



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.
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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.
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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. 

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5. Tear down the display screen power chip and connect power supply. The standby current recovers to normal 0, as shown in picture 5.
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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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