Macbook pro retina keyboard back light not working

Hey guys my macbook pro retina early 2013 backlight is not working ...i have tried increasing light intensity of backlight using f5 and f6 keys still its not glowing and i tried with app called labtrick ...still its not getting on

Have you tried SMC and PRAM resets?
http://support.apple.com/kb/HT3964
http://support.apple.com/kb/ht1379
Ciao.

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