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Repair Apple iPhone 6 has no display after booting

Problem

The iPhone 6 can boot normally, but the LCD screen has no display, just shows black screen. The backlight is normal; it can charge and receive the calls.

Solution

According the problem description, at first we thought the screws was broken, after we disassemble the iPhone by screwdrivers, the screws are fine.

This iPhone has a corrosive problem which caused by water, but there's nothing wrong with display socket.

Test the resistance value with multimeter, all is normal, then we check the power output of Light Control IC U1501, as shown in picture 7-11-1.


After checking, 4-Way power supply is normal, which means the chip is working. Working conditions are available, and the backlight also boosts, now it should be able to display it properly. However, after test it, it still no display. Now we need to check the signal from display socket to CPU.As shown in picture 7-11-2, 7-11-3, 7-11-4.




From the socket then through the inductor and directly to the CPU, CPU peripheral circuit testing is also normal. Now we try to replace the inductor, if it is still not working after replace the inductor, so that's the CPU problem. Check motherboard under the microscope, there is a layer of glue on the inductance of the physical diagram. As shown in picture 7-11-5.


When we remove the glue, we found the problem, as shown in picture 7-11-6.


There is a group display inductors that just fell down with the glue, and the solder pad on the inductor also dropped, is that the problem? So we solder it with the solderingstation on the motherboard.


Finally, power on iPhone 6, it can display normally. As shown in picture 7-11-7.


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