Why does my water damaged iPhone display a blank screen?
iPhone 4s fell in a cup of water for a second, face down. Touch screen works, I can receive calls, text messages, and facebook messages but the screen is completely blank. Bear with me, I haven't found anything on this particular case online.
So my mom had a cup of water in my car cup holder and my phone slipped and fell into the cup face down. Just the headphone jack, the front facing camera and the earpiece got wet. The camera light came on and would not turn off, so I waited for the phone to die.
I stupidly tried to function it out of panic, and then when I got home, I took the battery out and let it dry for over 12 hours. The touch screen responds: I can turn the flashlight on and off, I can turn the phone on and off, enter the passcode, accept calls (I remember where certain buttons are on the screen), it vibrates when I receive text messages and facebook messages, the alarms all still work, and I was even able to plug it up to my computer. iTunes recognized it and I could update it and back it up successfully. So I'm assuming my phone works and my wifi works.
My mom took it to a repair guy (not a repair shop -.-) and he replaced the front screen with another screen and it still didn't work. The backlight works, but the screen is still black. I couldn't see anything in the sunlight either.
I'm going to try to take it apart and clean all the pieces and some have suggested changing out the battery completely (which I will, just to be safe), but I think there's a specific display part within it that's faulty and needs replacing, and replacing the entire front screen doesn't seem to fix it.
Any suggestions as to what might be wrong with the hardware? I have fixed iPhone 4's and iPhone 4s's with much success. I just need to know where the problem might be, because the phone functions perfectly normal except the screen is still blank. It even charges properly! The problem must be a minor one, I just don't know where to start. Any help would be greatly appreciated.
I know about the iFixIt links such asthis one but this is for a phone that doesn't work at all. How will this fix my display if the phone is functioning just fine?
Thanks in advance!
EDIT: I can see the display a little bit (I mean, just barely) when I shine the flashlight from another iPhone on it. It's even still fully charged even after using it a little bit, as far as operating the alarm and answering the phone.
EDIT 2: I CAN EVEN HERE THE SPEAKERS. I can operate the phone, PERFECTLY. Just a black screen, only visible with a flashlight.