The iPhone 6 accidentally fell into the
water, and then the battery use time becomes very short, even though it is full
of power, but after one night standby, it turns zero. In this case, your phone
just like bubble, you can't use it, because it shuts down anytime. If your
phone is experiencing this, please don't be sad, you are in right place. This
page will help you to fix it.
Repair steps
1. Disassemble the iPhone 6 by phone
opening tools, remove the mainboard, we can find that it is obviously watered.
The water inflow label becomes red, as shown in picture 1.
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2. Tar down the shield cover from
motherboard, and we can find that motherboard components is eroded and goes
mouldy. Use board-washing water to clean the eroded places and pry up the badly
eroded and discoloured capacitors (picture 2). Use heating platform to dry the motherboard.
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3. After drying the motherboard, connect
the adjustable DC power supply. The
current shows 16mA. While before triggering on the normal motherboard of iPhone
6, four- number ammeter shows 0.000A. Showing 0.016mA suggests that it leaks
electricity. Based on the working principles of iPhone, only PP_BATT-VCC and
PP_VCC_MAIN have electricity in the case of not pressing power button. Thus,
the electricity leakage happens at the voltage of the two circuits. Because
many components are connected at the two circuits, we have to analyze them
separately. First measure PP_BATT-VCC. The circuits that connect with
PP_BATT_VCC in schematics diagram is
shown in yellow part in picture 3.
3
4. Remove Q1403 and U1401 to cut the
circuit of PP_VCC_MAIN. Energize motherboard and find no electricity, so the
problems happen at PP_VCC_MAIN. In general, badly electricity leakage problems
can be judged by rosin. However, the electricity leakage happens at this
motherboard is not serious. No components generate heat obviously, so rosin is useless. We have to tear them one by one. At
the bitmap, we can see that many components are at this circuit. The circuits
that connect with PP_ VCC_MAIN in bitmap is shown in yellow part in picture 4.
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5. Remove the capacitors at this circuit
first and then remove the chips that are connected with the capacitors. When
remove the ascending frequency chip U5302_RF of the near field communication, electricity leakage disappears. The
board after removing the voltage boost chip, flashlight chip and display chip
is shown in picture 5.
5
6. Assemble the previous removed parts and install
iPhone, then test it, the battery can back to normal work, the error has been
solved.
Tips
- when you start to fix it, you need to prepare the phone repair tools and the clean place, maybe you can try Vipprogrammer, i used to buy it here, all the tool with good quality.
- The ascending frequency chip U5302_RF (picture 6) of the near field communication cause electricity leakage. When you work on it, you should be very carefully and patiently.
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