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My macbook pro right speaker is not audible. it has jarring sound some times. left speaker is in perfect condeation. This thing happened when I am doing facetime. Can some one help me please.

Here’s the IFIXIT guide to get to the Right speaker: MacBook Pro 17" Unibody Subwoofer & Right Speaker Replacement. You should first check the connection to the logic board. If its tight you’ll need to replace the assembly.