laptop screen dim

Hi, I spilled water on my Lenovo Ideapad S145 15AST and dried it. It now work well except that the screen in dim. What could be the problem? How can I fix it?

This issue is driving me completely insane. About a month and a half ago, the screen on this laptop went very dim. I had been using the laptop when I left my apartment to go and do something. I didn't shut the laptop off or anything, and when I came back I noticed that the screen had gone black...