10539 Views 5 Replies Latest reply: Jan 21, 2009 3:23 PM by quadpeaks
Do you have a protective case on the iPhone? If you do try testing without it.
When you lift iPhone to your ear, the proximity sensor immediately turns off the display to save power and prevent inadvertent touches." http://www.apple.com/iphone/features/sensors.html
If there is not a protective case on the iPhone, try resetting or restoring the iPhone.
When you restored the iPhone, did you set it up as a new phone or recover from backup? Try restoring and setting it up as a new phone.
If the issue persists, the iPhone may need hardware repair. Just make a reservation to have a Genius at a local Apple retail store take a look at it or call AppleCare.
U.S. iPhone technical support: 1-800-MY-IPHONE (1-800-694-7466)
I had the same problem several days ago after charging my 3G iphone placed screen side up under a bright table lamp. I could barely make out the icons and the screen was almost completely dark but from what I could still make out all the apps and phone continued to work. I tried all of the suggestions in this thread with no luck. I then turned out all lights and went to sleep deciding to visit my Genius Bar the next day. When I awoke, the screen back light had restored itself when I tried it. My opinion is that the light sensor on the phone was "overloaded" or "desensitized" from being charged for several hours sitting underneath a bright table lamp light. I have had no problem or recurrence since. If anyone is still having this problem simply try turning the phone off and placing it in a dark place for a few hours or overnight, make sure it is charged, and try again in the morning.