We got a iPhone 6 Plus with problem, the owner of iPhone 6 Plus said that the touch of iPhone
is malfunctioning. It has been repaired in local repair shop, but after a few days of use, the issues came back. It was repaired several times, but it didn't work. Vip Pro Shop Team speculated that the U2402 black touch IC was damaged.
After check the iPhone 6 Plus, the
device was dropped on ground accidentally by customer, the touch failure fault
is definitely caused by U2402 black touch IC M1 pin sync signal disconnection. It
has been repaired, but there will still be the same phenomenon for touch
failure, as if the fault was expanded after the last repairs. Remove the U2402,
and reinstall the jumper, the iPhone 6
plus device can be used for a while, but there will be no touch function
phenomenon, it seems that the problem is not from here. After careful
observation under microscope, it shows
that the inductance and capacitance of J2019 diplay pin get tin explosure. As
shown in figure 7-2-1.
Measure
the ground resistance, as shown in picture 7-2-2
and 7-2-3, the inductance of signal synchronous is virtual soldered.
So
we solder it back with a soldering iron,
resistance shows normal now. As shown in picture 7-2-4.
Install
the iPhone 6 plus and test again, a day later appeared the display fault
again. Measure the resistance of display
pin, we find there are no resistance in many parts, gently touch inductor and
capacitor with tweezers under the
microscope, all of them can be moved, it looks like a large scale is virtual
soldered. So we decisively disassemble the whole parts and re welding them
again. As shown in picture 7-2-5 and 7-2-6.
Intall
the device and test, everything is normal now,the backside seal inductor and capacitor is virtual soldered,
which may be caused by long-time air gun blowing operation. The whole
maintenance process is finally successful!
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