Default Sony Xperia V Dead On Arrival

Hello.

I got a phone from a warranty, where was motherboard changed. After that i was still unable to use phone because my screen didn't and touch work. So i decided to buy a new LCD with touch from eBay. I changed the screen, pressed lock button and everything was fine, touch and screen. I got used to phone like 1 hour but after that phone screen sank and went blackscreen,

My software is updated.

Any tips to get my screen working?

Sorry for bad english.