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HI , recently i changed my sensor flex cable because my old sensor was not working . unfortunately i forget to remove the power cable before disassembling . now my iPhone won’t turn on .. not taking charging and even not detected by iTunes . anyone can help me out . thanks in advance .

Just unplug the battery return it back on your phone is okay for sure :)

What do you mean by sensor replacement? Is that the front camera ribbon cable flex assembly? Did you try booting up the phone with front camera flex and home button extension cable unplugged from logic board? Have you made sure not to put the longer screws into the 3 screw holes on the board to avoid long screw damage?