Sadly, it sounds like your display has gone. Time to replace the part.
While its possible moisture is still present water alone is not the enemy as many people think! You could dip your system is distilled water wait a day or two after leaving it in the sun to warm and power it up! I don't recommend you try this though ;-} Its the stuff in the water that kills you.
The corrosion caused by the ionic action of the salts and other contaminants in the water likely has shorted the circuit so waiting any longer most likely won't change things here. Sorry ;-{