Liquid Damage Screen Very Dim Works With HDMI Monitor

I have a mid 2013 Macbook air A1465 that I spilled water on 2 years ago. Ever since I have been using it with an HDMI monitor. Recently I decided I want to fix it myself. But then I found someone who would replace it for 99 bucks if I buy my own parts. I can still see the screen with a flashlight. The apple logo does not light up. What parts should I buy?