Original post by: David ,
I fix water damaged phones every once in while at my job. i would remove the logic bored and soak it in a alcohol bath (rubbing alcohol) most purest possible. use a brush like a small decently thick bristle brush to brush the entire bored. let dry for 5 min and retry and see if it works. Word of advice DO NOT put alcohol on the bored while it is attached to screen, alcohol can damage a screen.