Diagnosing your camera
If your camera is not working properly, you can run a diagnostics test to identify if there is a problem with the main camera, front camera, flash, or camera key.
To run a diagnostics test of your camera, make sure you are connected to the internet.
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While using the camera, tap (Settings icon).
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Tap (Introduction to features icon) > [Help] > [Launch the Support app].
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Tap [Xperia Tests], select a category, and then follow the on-screen instructions.