Solved: iPhone 6P Black Screen Trouble( No Display/ No backlight)

We received an damaged iPhone 6 Plus motherboard to repair, the problem is that the iPhone 6 Plus doesn't display, the iPhone backlight not working; after replace the new iPhone LCD screen, it still doesn't display. So, they think it's iPhone motherboard problem, and sent it to us for repairing

After received the iPhone motherboard, put it under the microscope to check , there are several place has been repaired, the iPhone display touch IC of the iPhone motherboard has been removed, iPhone light control IC U1501 has been removed, and NUT column also has been removed. Moreover, the bottom of the NUT column on the iPhone motherboard has been hit by a long screw.

Use QUICK 861DW hot air rework station and BGA remove graver to scrape it, there is no disconnection phenomenon.

Measuring the resistance value for the D3# layer of the iPhone display touch power supply IC U1501 by digital multimeter, there is no resistance, which is abnormal.

After check iPhone schematic diagram on the WUXINJI Dongle, we use QUICK 861DW hot air rework station to solder a jump wire from resistor R0302 to U1501D3#, and then install a good U1501.

Now, use digital multimeter to measure the resistance value again, the data is normal.

Find an iPhone, and then install the iPhone motherboard to the iPhone, turn on the iPhone and test it, the iPhone backlight works perfectly, the iPhone LCD screen displays normally.

Send back the iPhone motherboard to the customer, the iPhone works good.