Problem with E61 - no more light for keyboard

I have a E61 and now there is no more light for the keyboard
I put all default settings but the keyboard stays always dark
What is the problem ?
Thanks for helping

The problem could lie with your photo detector on the top left corner of the phone. If this does not detect light correctly or if it does not detect light at all it will cause the keypad lights to malfunction.
Best let your NSC test it and repair what is necessary.
iPhone 5 32GB
MacBook Pro Retina 15" Mac OS X Mountain Lion 10.8.4

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