Take the board out, on the other side you will see the solder points of the headphone jack. Redo all soldering, letting each point cool down before you do another one for the best contact. If it doesn't work then either, get another jack and solder it in place of the old one.
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For my dreams i hold my life...
I miss my Meizu M6SL... Currently rocking a Sony Ericsson w595 on Samsung in-ear phones. Does fine, but it's not a chipod... 
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