Received an iPhone 6 need to be repaired, the problem is that the iPhone 6 is black screen, it has no display. The iPhone user said that the iPhone screen has some problem, so he replace the new display screen, the result is iPhone shows nothing, always black screen. Here is the best fix.
After checking, the diode data of display
socket is normal and all power supply for iPhone display
IC output is normal. Connect iPhone
motherboard to DC power supply to test, we find the current is abnormal.
When press the iPhone power button, the boot current is obviously large.
The current reached 100mA when press the
power button. After remove the display tube, the current still the same, which
means there is a short circuit. Measure the voltage output of each circuit of
power supply with Fluke 15B+ Digital Multimeter, then surprised to find that there are
really short circuit places.
LD010 is short circuit; we suspect that the
filter capacitance on the circuit has been penetrated. After remove the iPhone power control IC, we found it is ground short circuit. Open
the WUXINJI Dongle to check the iPhone schematic circuit, we
found that this circuit is the display card image transmission MIPI data bus
power supply.
CPU breakdown, the iPhone 6 doesn't display
is possibly caused by physical damaged that the iPhone display screen
electrostatic breakdown the CPU internal video card part. Put it under the 7-45X
180X Stereo Zoom Microscope, adjust the stable voltage to 1.5V, and then
shock this circuit. At the shock moment, the power meter current jumps to more
than 500 mA and then becomes 0. Shock it again, the current is not responding.
Measuring the diode data shown is 180.
Install the main power, and then connect it
to DC power supply to turn it on, the current not start from 100mA, but start
from normal data 60mA. Assemble the iPhone display screen to test; now the iPhone 6 can be displayed
normally.
After get into IOS, we test other functions, everything works fine!
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