@sohailalikhan sounds like a bad display cable. If you open the screen to far it either rubs against another wire or the chassis. That can cause this or it puts strain on the circuit board by pulling, which can cause this as well.
Take a look on here [guide|158787] for the wiring etc. It is not a complete guide but should definitely help you out.
If there are any issues that you are unclear about, post some good pictures. That way we can see what you see and hopefully help you further. [guide|21499]