Funny solution. I was !#^&@@ of as it was not working do i came back to it a couple days later and it was working so i rebuild and sealed and it stopped working. then disconnected battery then reconnected now working agian.
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'''Update'''
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This customer came back after 3 months saying no ear peice !
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I got some kapton tape as did not have the old screen to hand and put it where the black tape should be (as expalined in the chosen answer above) and now it is all working as should.
Funny solution. I was !#^&@@ of as it was not working do i came back to it a couple days later and it was working so i rebuild and sealed and it stopped working. then disconnected battery then reconnected now working agian.