iPhone 4 got wet, but works, screen dark
Iphone 4 was dropped in water. Did the bowl of rice, no joy.
Disassembled iPhone, cleaned corrosion from mother board, various connection points (there was some significant blooms of greenish corrosion in a few places.)
Reassembled iPhone does everything - - EXCEPT - - the screen is dark. It's receiving texts, it can answer calls, I can unlock the screen and hit the home button twice and then play a song (these are the operations I could hit in the dark.) When plugged into my Mac, it shows up normally in iTunes. I did a restore, a system upgrade to the current iOS 5.1. Everything is fine, except the screen is dark.
How can I tell if the problem is the LCD/display assembly? Could the problem be upstream of the display (motherboard? cabling? or...?)? I would like to be able to find out what I can before spending money on parts which I may not need.
Any sage advice would be greatly appreciated!!
jjwhitney, since it does sound like you already cleaned the iPhone, we can skip the steps about cleaning it with high grade isopropyl alcohol :-) There is really no a surefire way to say which part is the one that gives you the problem. I would recommend that you start it systematically. Start with the easiest part, and that is the display, replace that. If your screen is absolutely black, with no faint images, I am certain that this is your problem. If it would have faint images, I would recommend to take a look at the backlight IC and coil on the logic board. That repair is a bit more difficult due to the fact that those are SMD components. Try the display first. Hope this helps, good luck.