Introduction
This guide will help you in identifying the soldering joints locations for the loud speaker on the iPod Touch 4th Generation
Tools
Parts
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            I've boxed where the ribbon cable connectors go for the screen and camera. 
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            The soldering joints are marked with a Blue and a Red dot to indicate where to solder the speaker wires. 
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            The second picture shows the wires soldered to the logic board. 
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            The loud speaker replacement was very tedious job.. anyways Good Luck 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.