Einleitung
If your ZTE Quest's power and/or volume buttons aren't working properly then it may be necessary to replace them. This guide requires extensive soldering knowledge and should really only be attempted as a last resort.
Werkzeuge
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Orient the device so that the inset on the right side of the device is facing you.
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Insert the spudger into the inset and carefully remove the back panel.
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Use the JIS #000 screwdriver to remove the six 3.0mm screws placed in the back of the ZTE Quest.
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Pull back the tape encasing the brown ribbon cable connector.
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Remove the ribbon cable from its socket.
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Unplug the flat-top connector by using a pair of tweezers to pry up each side before removing the connector from its socket.
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Each of these buttons can be removed using micro-soldering techniques around either side of the button.
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Instructions for how to do so can be found at iFixit's How to Solder and Desolder Connections guide.
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To reassemble your device, follow these instructions in reverse order.