Introduction
If the rear speaker on your Blackberry 7520 is broken, look here to install a new one.
Tools
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            Turn the phone upside down. 
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            Push down on the black button on the back of the phone to slide the rear panel off. 
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            The battery should be visible now. 
 
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            Use a pick or plastic iPod opening tool to push the clips, that are holding the rear casing. Apply a firm pressure at a forty-five degree angle to dislodge the clips. 
 
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            Separating the two halves allows you to access the speaker. Which is located in the front half of the case. 
 
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            Insert a plastic opening tool between the speaker and the case. Then pry the speaker out. 
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            To reinsert the speaker, align the blue notch to the blue stud. Then the red notch to the red stud. As shown in the last picture. 
 
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To reassemble your device, follow these instructions in reverse order.