Introduction
Remove the lower case in your Apple TV 1st Generation.
Tools
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            Starting at one side of the device, use a hairdryer or a heat gun to soften the adhesive holding the rubber base in place. 
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            While the adhesive is still warm, peel the bottom of the rubber base upwards to detach it from the metal plate. 
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            Repeat the procedure described above until the rubber base has been completely removed. 
 
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            Carefully lift the lower case from the upper case enough to allow access to the internals of the Apple TV. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
One comment
This guide may make more sense as a teardown, since its not really showing any repairs or replacements.