What can cause a blank black screen on iPhone 5S?

What can cause a blank black screen on iPhone 5S?

I am trying to repair an iPhone 5S. I have tested its LCD, and it is working perfectly. I connected the phone to a laptop, and iTunes just responds correctly as if it is a normal iPhone, displaying its information, contents in memory, etc. But there is nothing on the iPhone screen. I wonder if there is anything other than the logic board that can cause zero video output to the LCD.

Asked by: Guest | Views: 178

Total answers/comments: 5

Comments display order:

Guest [Entry]

Do you have the old screen to test the phone with? If so try that and if that displays correctly then it's the screen it self

Guest [Entry]

This makes no sense at all screens work but not with 5c change logic board and still don't work now they don't?? Confused

Guest [Entry]

I have same problem however, i cannot turn off phone. I can use voice commands but nothing screen related. this after i dropped my phone and ended up with vertical lines turning into eventual purple screen. I tried reseating connectors. now have black screen. Any suggestions?

Guest [Entry]

i too have the same problem and I have tried every steps but nothing has worked. please help me out

Guest [Entry]

Why wont it let you turn it on when the I tunes logo pops up?