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It is very helpful to add some soldering paste to the area of the logic board you will be removing solder from—it will help make the process easier and prevent from possibly pulling a pad off the logic board. I am desoldering the + and - battery connections above the SPK points in the picture.
Apply the de-soldering wick to the area you are removing the solder from and hold the solder gun on it so it can soak the solder up in the wick. Be very careful to not leave the solder gun on too long as the logic board components are very fragile.
Carefully remove the soldering iron and the wick at the same time. If you remove the solder gun first and then the wick the solder can harden and you could possibly pull components off the board. As you can see the solder pads on the logic board are clean with no excess and ready for fresh solder.