Introduction
There are two boards for the device, a green top level and a blue lower level. This guide will show the steps to replace the bottom motherboard.
Metal spudgers and similar pry tools can puncture an unprotected battery, potentially causing a fire. When working with electronics, it's important to choose a tool that's ESD-safe to avoid accidental damage to the device. The metal spudger is great when you need serious prying power, but the regular black nylon spudger or a plastic opening tool should be used whenever possible.
Tools
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            Start by using a spudger or plastic opening tool to remove the bottom cover. 
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            Once enough of the glue is removed, peel the cover off by hand, 
 
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            Use a nylon spudger to unsnap the bottom from the sides. 
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            Pry until the remaining three points are unsnapped. 
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            Once unsnapped, lift the cover. 
 
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            Use a plastic opening tool or spudger to remove the adhesive covering the the WIFI connectors. 
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            Gently pull the wires at the connection point to disconnect them from the motherboard. 
 
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            Scrape the glued pad underneath the WIFI card to seperate the card from the board. 
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            Push apart the two clips holding the WIFI card in the connection. 
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            Pull the WIFI card out of the connection. 
 
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            Picture shows the side of the device. 
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            Remove the 7mm length Phillips screw from the power supply motherboard. 
 
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            Remove the adhesive backed rear label by using a spudger. 
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            Remove the two 8mm length screws as shown. 
 
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            Remove the other two 8mm length screws on the back of the device. You might have already removed the screws for the power supply, and that's OK! 
 
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To reassemble your device, follow these instructions in reverse order.
One comment
I have bad audio on one channel, who supplies parts for this equipment?
Careful as the rubber bottom rips extremely easily. Be very patient.
marcos_peixoto1 -