back button on note 4 not working

A

AC Question

hello there,
after i replaced my note 4 screen (successfully kinda) the back button is not working (no light as well) i guess that i messed up its sensor. However, I have no clue which one is the back light censor (or maybe connector) anyone knows where is the back button connector to the logic board ? ( i thought it was the two cables the blue and the white but found out that those are for the signal )
thanks a lot
 

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