Logo appears when turned on and backlights work but goes black after

I have a Vizio D55-E2 that fell off a table and the top right corner plastic is cracked. When I turn in he tv the logo appears with normal black background but then the background turns green for a second and then the screen goes black. The backlights still work so the screen isn't a jet black, just a black like you're on an input with nothing plugged into it. It also shuts itself off after about five minutes. Any type of information would be helpful. If I can but the parts and fix it myself I would prefer to do that but the more I read the more I get the feeling if might be the same as buying a new tv...if not more expensive. Thanks