How to fix my iphone the screen went black?

While i was using it was lil bit white in places its still workin but i can't see anything on the screen please help

Added (1). I have already got a new screen as i smashed the first one it has only been in there for about a month n was just asking to see if anyone nos how to fix it b4 next week when i get a new one off ebay i have a friend who dose it for me

You are going to have to get it fixed

You might have to replace the screen. You can see the price of the screen from here http://www.etradesupply.com/apple/iphone.html

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