Chosen Solution
Backstory: The power button on my began to slowly stop working until it completely failed. I ordered and installed the ribbon cable which connects the power button, volume controls and vibration motor. After this replacement the power button’s is fully functional again. Problem: After this replacement the proximity sensor no longer functions. In other words, during phone calls the screen is not disabled. Symptoms/ Attempts to fix: I have tried to re-seat the connections from the front panel to the logic board. The connections are definitely established because the front facing camera works flawlessly. I then through to purchase a new ribbon cable and proximity sensor, after replacing this component the proximity sensor still fails to function. I am currently putting up with this issue as I have no more ideas on a potential solution. Update (05/28/2014) Mario, Unfortunately, I have resorted to dealing with the issue. I spent a great deal of time getting the original issue regarding the lock button fixed and didn’t have much more time to spend dealing with the more recent proximity issue. Very frustrating. Please post back if you find a solution.
Was going to say replace the proximity sensor but u have . Mayb you have damaged components in the motherboard
