This iPhone 6 device has been repaired before, the main fault is the charging problem, although the screen shows a charge icon, but the power does not really enter the mobile phone, and the phone reboots sometimes. After receiving this fault cell phone, we found that the main board charging chip, battery and accessories were replaced before.
1. Measure the voltage
of (C1408, C1700) USB were given to U1401 charge tube and U1700 (U2), the both
5V value are normal.
2. Remove the U2 and charge tube respectively, measure the bottom voltage to see whether the iPhone 6 motherboard has broken cables, the
result shows that the two chips are all normal.
3. Replace the
two new chips and charge to have a test, the fault is same as before.
4. Connect the
iPhone 6 with computer, It displays no data for the battery life on Ace assistant, this often happens on iPhone 6 and iPhone 6P, basically it's caused by the
problem of CPU to the charge tube battery detection circuit, also the solutions
are different.
5. By checking
2.2K resistance(remove R0302 and R0303 from junk motherboard) on WUXINJI schematic diagram, then connect the two
resistors together. One end receives the main power supply, and the other end
is grounded, and solder a jumper wire to charge tube G1 pin in the middele of
the two resistors.
6. Personally, I
think this method is troublesome, there is another simple way to use: add a 10K
resistance (R0307 or R0310) on C1700(next to U2), which can be directly welded
to one end of the C1700 PP3.0V, the other end can be welded to the charge tube
G1 pin, then use green oil and UV light
to solid.
7. Install the
iPhone 6 device to test, charging function is normal now.
More professional cell phone repair tutorials, please visit www.vipfixphone.com
More professional cell phone repair tutorials, please visit www.vipfixphone.com
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