Repair iPhone 7 Screen Not Displaying
Many people find that when they use their mobile phones, the occasional bump touching, or improper use will cause the phenomenon of the black screen of the mobile phone. Down I will bring you a black screen on the phone but there is a sound reason and what to do, hurry up come check it out.
Press the iPhone power button, but it looks like the iPhone didn’t respond, because the screen was always black. Use another phone to call this iPhone 7, the iPhone 7 responded, and we heard the call ring. So, this iPhone 7 has black screen problem, we need to fix it.
First of all, we need to disassemble the iPhone 7. Use screwdriver to remove the screws next to the iPhone lightning port, and then put the iPhone 7 on the screen separator for heating. After a while, we can use screen sucker to open the iPhone 7 screen.
Disconnect the iPhone battery, and then connect the iPhone 7 to the DC power supply, after measurement, the current is normal. Connect the iPhone 7 to a computer by iPhone lighting cable, it reacts properly, but the iPhone screen still doesn’t display.
Remove the iPhone display assembly; take out the iPhone 7 motherboard.
Use digital multimeter to measure the basic condition required for the iPhone screen display, when measured 7th Pin PP_1V8 display screen power supply of the iPhone display touch socket J4502, the resistance value is infinity.
Log in to the ZXW Online Account to check iPhone 7 schematic diagrams, it’s found that this power supply is transferred by pp1v8_LCM_CONN that was renamed by after PP1v8 passes FL3906 inductor.
Use digital multimeter to measure the other side of this inductor, there is value, which indicated that the inductor FL3906 was damaged.
Use AIFEN A902 Soldering Station to solder a jump wire to connect it, and then measure it again, now the data measured is normal.
Assemble the iPhone 7, press the power button, the iPhone 7 screen lights up normally, and the iPhone black screen problem has been fixed.
The above is the repair method for repairing iPhone 7 with sound but black screen, Hope it will be useful to everyone. For more details, please follow PHONEFIX！
