No backlight from the new lcd

His description is definitely vague. I slightly cracked my z3+ from a 2 foot fall. On top of the absurd circumstances that the screen cracked do the area around the cracks the touchscreen didn't work. Even worse was that Half of the touchscreen on the opposite half of the crack. A week later I dropped the phone from a similarly low height and it shattered completely. This time I dropped in on a soft carpet. Both drops happened while wearing a silicone case, and the impact was on the sides. I'm surprised by how easily the screen broke. And I'm terrified reading about stories like those one if unsuccessful repairs.

Usually when there's no display it's either a faulty LCD or the LCD cable is not plugged in properly.

And in my opinion Sony Xperia lineup are all fragile with their design. The glass is very thin on the Sony Xperia Z3 compared to other phones like Samsung and etc.