Repair iPhone 6 Cannot Boot while Charging

Got the iphone, attached file described：iPhone 6 can't boot while charging .

Tested by multimeter, the current shows 80mA. So we decided to remove the  iPhone 6 motherboard while taking the USB off, but the current kept the same. We measured the I2C resistance  which shows the fault sources, as shows in picture11-10-1.

Since it's short circuit, it means the connected chip is damaged, the connected chips have display, backlight, main power supply USB and the iPhone 6 CPU. 

First observe with microscope, it is found that all the backlight diodes are burning and dis-coloring.

Then remove the backlight first, it does not short-circuit. The trigger current is normal, so continue to replace the 3 piece of iPhone backlight chips.

According to our past experience, if the large inductors gets discoloring, the large inductors with connected backlight would also have problems, so we replace them together. As shown in picture 11-10-2.

After the replacement, the current is triggered normally, Install the USB to turn on the iPhone 6, the functions are all tested normally. As shown in picture 11-10-3.