Iphone works but screen won't turn on?

So after dropping my iphone 4S in the toliet I put it in rice for a week. I charged it but the screen didn't turn on, my step fater called it it would ring. So we know everything inside works. Just the screen won't turn on it just stays black. How can I fix that?

You will have to change the screen.go to apple store

The rice trick doesn't work on iphones, it will never work correctly again

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