The iPhone 6s accidentally drop into ground, we pick it up and turn it on, the iPhone screen shows black, it just no display. However, it can receive the phone call. We need best solution for this issue!
Disassemble the iPhone;
take out the iPhone battery and supply power to it with DC power supply, the current is normal. Remove the iPhone screen, and then install the test screen, power
on it and test it, the screen can display normally and appear white Apple
interface. We thought the screen was damaged by dropping, but when we plug the
original screen, it also can be light up, so we can exclude screen problem.
The
device light up, there are some problems when we are waiting to enter the IOS
interface, blurry screen, grey screen, black screen, and it then cannot be wake
up. Unplug the power and reboot iPhone, but the problems still exists.
Determine the fault is in the display
section, remove the iPhone motherboard, use multimeter to measure the diode date of display
socket, the data of all signal and power supply is normal. Reinsert screen and
boot it, the white Apple still can be display, but after about 10 seconds, the
screen suddenly turn into dark.
Unplug the power plug and screen test
socket, measure the diode data on it, we found that the diode data of two pins
on backlight is abnormal, one is more than 300, one is more than 700, the
normal data of both pins should be around 600, as shown in picture 9-11-2.
After a while, the data is normal, the data of these two pins also is normal in
the first time, so we judged the faulty probably in the backlight part, so we
replace the backlight IC. We can check it under the microscope.
After replace the iPhonebacklight IC, the boot process without any
abnormalities, it can directly into the IOS.
Finally, we input the boot password and test
all functions, everything is fine. The iPhone 6s has been repaired!
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