Can't increase brightness after a screen repair
I'm new here. My problem is Last day I have repaired my Xperia Z screen assembly. After repairing it I found that I can't adjust the screen brightness. The dispaly is at it's lowest brightness if the brightness level is 0 or if it is 100. I don't why this happens. I did a hard reset. But it doesn't solve the problem. please help me to resolve this problem.