Introduction
Replace the logic board when all other methods of reparation fail
Tools
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            Remove the battery by pressing down on the battery release button while sliding the battery downwards. 
 
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            Remove the four small black screws that secure the back phone panel using the Phillips #00 screwdriver. 
 
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            Carefully separate the front and back panels by gently prying them apart. Start at the bottom of the phone (near the AC charger input). 
 
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            Remove the two screws above the LCD screen with a Phillips #00 screw driver. These connect to the white plastic cover in which the speaker is housed located on the reverse side of the logic board. 
 
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            Locate the two wires (black and red) which connect the speaker to the logic board. 
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            Using your nails, tweezers, or any precise grabbing tool, pinch the speaker connector (clear plastic plug that goes into the logic board) and pull gently. It should pop out easily. 
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            Once the wires are disconnected and the screws removed, the white plastic cover can easily be removed from the logic board. 
 
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To reassemble your device, follow these instructions in reverse order.