Introduction
This replacement guide will require a soldering tool and various other iFixit tools.
Tools
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            Carefully, lift the motherboard and turn it to the backside. 
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            Desolder the four corners of the power button. Please follow this link on how to proceed to desolder: How To Solder and Desolder Connections 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.