I recently dropped my phone in a bowl of milk. I took it out, dried it, took out the battery and stuck both the battery and phone in a bowl of dried uncooked rice. More than 48 hours later the phone works, turned on for 5 minutes than the screen goes black. I put it back in the rice took it out 3 hours later everything on the phone works perfectly but the screen is completely black. What can I do to fix it?