Default Big problems with screen

Hello guys, i have a big problem with SGS2. Firstly screen started to flicker as in this video: http://www.youtube.com/watch?v=lhNmt-CKuYY
but not so hard and not when touching it.
Now the light has gone... It turns on sometimes, but very rare and just for a second...
What could be wrong with it? What part of it could be broken or faulty? Mainboard? LCD?