Introduction
If you are confident that your motherboard needs to be replaced, and have a replacement motherboard, then follow this guide.
Tools
Parts
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            Open the battery compartment and remove the batteries. 
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            Remove all of the visible screws on the outside of the case. 
 
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            Remove all six screws on the front side of the motherboard circled in the picture. 
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            Pull the motherboard from the rest of the housing. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.