Chosen Solution
Hi I had a busted iphone 3GS display and I followed the great guide on ifixit. Now the iphone is working great expect for one important thing. When I make a call, the display wont “lock”, So when I put the Iphone up to my ear, my cheek touches the iphone activating the speaker or punching numbers. I guess that the iphone should have a sensor, that detects the position when a call is made, and putting the display in a locked mode. How can I fix this? Thank you very much. Best regards Dennis
It is definitely the #3 ribbon. If reseating doesnt work, then replace. Careful not to damage the connector. The ribbons are pretty fragile to bends and kinks. Avoid this.
You may Need to change ur proximity and light sensor the one u bought may have been defected.
What about in a Iphone 4? I have Same issue.
