Xbox 360 Minecraft SplitScreen?

I wanted to play Minecraft with my Sister offline 2 player splitscreen. I have a HD LED 32 inch Tv and Minecraft doesn't work. I tried changing HDTV output- 720p. All it says the wire is disabled. I tried enabling it and all it does is turn to a black screen… What do I do?! I really wanna play minecraft with my sis

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