Backlight out after water damage - still works a little bit!

So I put my phone through the wash 2 weeks ago, and I put it in rice and damprid and all that for a whole week. Once I got a new battery ordered, everything worked great, except the wi-fi and the cameras. The backlight went out for a bit one day but came back on. Now when I use it the backlight flashes the lock screen (or when I turn it on) the Apple logo for about a split second and then fades out very quickly. What am I going to have to do? Yes, I've searched, but I've largely only found results relating to 3G and 3Gs. Will a teardown/cleaning solve this? Or is it shot?