Low brightness after lcd replacement

Hi , i change my lcd screen for xperia z2 , its work colors are perfect , but light is very low very low brightness and its can't changed in settings ( nothing change when i make brightness low or hight in settings ) what i have to do ?

Update (09/24/2015)

any answer ? please !!!!

Update (09/25/2015)

no one!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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