My xperia P s screen wont turn on

[Mokoko]

Hello, i have just changed my xperia p battery by myself. And it caused a black screen error. I think new battery don't empower the screen. Can it be any damaged cable  that causes this problem. Or there is something else. Because i have opened my phone and i didn t see anything broken or damaged and i did it very carefully. Thanks for your help.

[Samuel1]

Unfortunately this isn't really something we can help you out with. I recommend that you send the phone in to a service center for repair. See my signature for contact information to your local Xperia support.