The iPhone 7 screen doesn't display, it has black screen issues, how to troubleshoot it? The screen issue is one the most common problems for the iPhone, there are many solutions for fixing this black screen issue. Let's troubleshoot this iPhone 7 black screen issue.
The iPhone accidentally drop into the ground, after pick it up, the iPhone screen is good, but it doesn't display after booting.
Let's try some software solutions first, if the software solution doesn't work, then we should try hardware solution. After trying the software solutions ( Force restart/ Update IOS/ DFU restore), the iPhone screen still is black, now we need check iPhone motherboard.
Disassemble the iPhone 7 , remove the iPhone display screen, and then take out the iPhone motherboard, connect it with the DC power supply to test the iPhone boot current, the boot current jumps to around 350mA, and then turns downs and restart.
Because the iPhone 7 screen is damaged by dropping, so we suspected it's caused by virtual-welded iPhone Nand flash or damaged system.
Connect iPhone to the computer, and then brush it with iTunes, the iTunes reports unknown error 4013. The error 4013 is related to iPhone Nand flash problem.
Use QUICK 861DW hot air rework station to remove the iPhone Nand flash, and then measure the diode data of the iPhone data cable that communicates between the iPhone Nand flash and the CPU, the data tested is normal.
Install the iPhone Nand flash to the JC P7 Nand programmer; the data of iPhone Nand flash can be read normally, which means the iPhone nand flash has no problem.
As we know, the iPhone baseband CPU problem also will cause this problem. Put iPhone motherboard under the microscope to observe, no components are missing. Directly remove the iPhone baseband CPU, clean up the solder pad, and then re-weld the iPhone baseband CPU to the iPhone motherboard.
Assemble the iPhone 7, press the power button, after few seconds, the Apple logo appears normally, and then the iPhone enters IOS system.
Testing the functions on iPhone, the touch function, WIFI function, camera function and other functions all is working. The repairs end!
The iPhone accidentally drop into the ground, after pick it up, the iPhone screen is good, but it doesn't display after booting.
Let's try some software solutions first, if the software solution doesn't work, then we should try hardware solution. After trying the software solutions ( Force restart/ Update IOS/ DFU restore), the iPhone screen still is black, now we need check iPhone motherboard.
Disassemble the iPhone 7 , remove the iPhone display screen, and then take out the iPhone motherboard, connect it with the DC power supply to test the iPhone boot current, the boot current jumps to around 350mA, and then turns downs and restart.
Because the iPhone 7 screen is damaged by dropping, so we suspected it's caused by virtual-welded iPhone Nand flash or damaged system.
Connect iPhone to the computer, and then brush it with iTunes, the iTunes reports unknown error 4013. The error 4013 is related to iPhone Nand flash problem.
Use QUICK 861DW hot air rework station to remove the iPhone Nand flash, and then measure the diode data of the iPhone data cable that communicates between the iPhone Nand flash and the CPU, the data tested is normal.
Install the iPhone Nand flash to the JC P7 Nand programmer; the data of iPhone Nand flash can be read normally, which means the iPhone nand flash has no problem.
As we know, the iPhone baseband CPU problem also will cause this problem. Put iPhone motherboard under the microscope to observe, no components are missing. Directly remove the iPhone baseband CPU, clean up the solder pad, and then re-weld the iPhone baseband CPU to the iPhone motherboard.
Assemble the iPhone 7, press the power button, after few seconds, the Apple logo appears normally, and then the iPhone enters IOS system.
Testing the functions on iPhone, the touch function, WIFI function, camera function and other functions all is working. The repairs end!
No comments:
Post a Comment