Got a iPhone 6 Plus from one of our customers, the main fault is that the front camera and distance sensor can't work normally now. Which part get damaged? how can we repair the 2 functions well? Let's check in this article!
According to past experience, these two faults are generally concentrated on the flex cable of the front camera, which may be caused by wire damage. First of all, we need to eliminate the possibility of external components failure, and then consider the motherboard problem.
After removing the screen component and replacing a new one, we are still unable to open the front camera and use the distance sensor.
Disassemble to
measure the ground resistance of the front camera seat of J1111 by Fluke digital multimeter, it is found that
several pins are infinitely large, and the related inductors are loose when
touch with the pen. It seems that the small components are pseudo welded.
Remove the
motherboard and observe it under the Trinocular Stereo Microscope, we can see that the touch was repaired before.
The back of the
sub touch chip U2402 is the front camera seat J1111, and the small components
next to the seat are all black glue. If the temperature of the chip is not
mastered, it is likely to blow the small components on the back. After removing
the black glue next to the J1111 seat by the QUICK861DW hot air gun, the large area of spot welding and loose
components were found.
Next, connect the
corresponding inductor and the resistance of the short circuit by checking WUXINJI schematic diagram.
Reinstall to test, the function of the distance sensor returned to normal and the front camera works normal too.
The trouble is that the temperature of screen repair is not well controlled, and the small parts covered with black glue are pseudo welded.
Get more cell phone repair skills and tools on www.vipfixphone.com
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