My iphone screen won't come on but i can still hear sound?

So i got my iphone 4s wet and used that rice trick and when I turned it on I could hear noise and i can still use siri fine and when I get stuff on social media it rings but I can't see anything on the screen, it just stays black. Does anyone know what specific part I have to replace or is it not worth the trouble and should i just get a new phone?

Replace. But if it still won't work get your $$ back and buy a new one.