Introduction
If the Sony TCM-919 is not recording sound, this guide provides replacement solutions. Comprehensive device opening and dismantling up to microphone replacement will be covered.
Tools
Parts
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            Turn the device around so that the back cover if facing upward. Use your thumbs to press down firmly and then push the battery door cover open. 
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            Remove any batteries. 
 
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            Look to the back of the top cover. 
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            Desolder the two wires connected to the mircophone using the soldering station. 
 
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            Gently remove the rubber top from the two plastic knobs that hold the microphone in place. 
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            Remove the microphone by pulling up. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.