Tools
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                  - 
            Heat to soften back cover sticker. 
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            Place the suction cup and try to open a gap. 
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            Insert the guitar pick into the gap. 
 
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                  - 
            Remove two screws by Philips screwdriver. 
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            Release all the connectors connecting with loudspeaker assembly. 
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            Remove the small vibrator securing bracket. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
2 comments
this is all good but is there a link to the part ?
EBay search Sony z3 replacement loud speaker cost's around £3-£5