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This light sensor senses the outside light and activates the keypad light accordingly.
When you have enough backround light the keypad light wont light up.If the background light is less then the keypad light wil light up.
You dont get the keypad light ON because the light sensor might have activated.
If in dark also you wont get the keypad light on then the fault lies with the keypad light unit.please give your mobile to the nearest authorised service centre for service.
open up your phone you'll need phone screw here.than you can check keypad connector,clean up with an pencils eraser(its safety) usually keypad or keypad light problem because off dirty connector.good luck.