Esto lo encontré en XDA, miren si les funciona:
"Solved this by doing the following:
1. Go to Settings -> About phone
2. Tap 5-6 times on "Kernel version". This will enter to Engineering Mode (CIT)
3. From "QC test" menu, go to option "12.FrontCamera"
4. Camera app will start with the front camera. Now change camera from front to back. You should have image from sensor.
5. Tap back to exit the camera app, and select "Fail". This will reset the sensor and sensor lens.
6. Exit CIT mode and test your camera. If was a problem with the sensor (or lens), it should be solved now.
For me, this was the only thing that worked.
I tryed before to reboot phone, factory reset, reflash other ROM"
"Solved this by doing the following:
1. Go to Settings -> About phone
2. Tap 5-6 times on "Kernel version". This will enter to Engineering Mode (CIT)
3. From "QC test" menu, go to option "12.FrontCamera"
4. Camera app will start with the front camera. Now change camera from front to back. You should have image from sensor.
5. Tap back to exit the camera app, and select "Fail". This will reset the sensor and sensor lens.
6. Exit CIT mode and test your camera. If was a problem with the sensor (or lens), it should be solved now.
For me, this was the only thing that worked.
I tryed before to reboot phone, factory reset, reflash other ROM"