Before doing any thing make sure that damaged earpiece is not causing this problem. I have marked Nokia Nokia Lumia 900 Speaker ways in this diagram make the jumpers as shown in it.
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Here Are Earpiece Ways Problem Solutions. Please Observe Carefully.
Nokia Lumia 900 Speaker Ways Jumpers
Nokia 900 Ear Speaker Solution Jumper
Nokia Lumia 900 Speaker Track Ways
Repair Nokia Lumia 900 Ear Speaker Problem
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