Replaced lcd, screen works, then half works, now none of it works

Hello! I have a samsung galaxy s5

I replaced my screen + digitizer paid about 160 on amazon for one with best reviews.

Replaced the screen and it worked perfectly everything worked I tested everything. Then a day later, this happened

http://i.imgur.com/8wlaBPM.jpg

half the screen does not work.

Then someone called me and it went totally black

any help is appreciated!