"No backlight after screen replacement z3 xperia compact"に関する回答Hi, please see this answer: Replaced Screen But Blank Display I hope this helps!
"Replaced Screen But Blank Display"に関する回答Hi, I had the same problem. When you google it, you find lots of software solutions, resetting and firmware reloading and so on, which did not work for me. I also replaced the screen which I have done many times before, but this time eventually I blew the fuse for the LCD backlight. So please try to take a very bright light from your desktop lamp or LED-torch and shine light _through the back_ of the LCD. Of course you have to be careful to keep all that mainboard, LCD and torch in one hand and have the other one to operate the buttons. You should avoid to create just another short on the power supply and blow even more things... However, if you see your display working with your home made backlight, then this reply is for you. I found the solution at http://progulki.com.ua/sony-xperia-z3-compact-ne-rabotaet-podsvetka/ and also here: http://www.mobilerdx.com/2015/03/sony-xperia-z3-display-lighting-problem-repair-solution.html There it sais it is for Xperia Z3 but in fact it is Z3C and the picture rotated...