Tools
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            Switch off the phone, remove the battery and any installed SIM and memory cards. 
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            Remove 7x Torx T5 screws. 
 
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            Use a plastic tool to remove the rear bezel. 
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            The loudspeaker is on the inner side of the rear bezel. 
 
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            Disconnect the touch screen flex cable. 
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            Disconnect the light sensor flex cable. 
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            Unstuck the vibra-motor from the middle frame. 
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            Remove the coaxial antenna cable from the middle frame. 
 
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            At the upper left side, the board is held by a plastic locking clip. Use a plastic tool and start the separating from here. 
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            Gently disconnect the LCD display flex cable. 
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            Now remove the logic board. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.