Not everything works perfectly the first time. It’s common to need to make changes to a circuit that has already been assembled, either to repair a failure or to fix an assembly mistake.
Often this means removing a component from the board, and either re-fitting it or replacing it with a new part.
Don’t worry, it’s a common task in electronics and over time you’ll learn a collection of tricks and techniques that will make it seem easy.
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Removing multi-pin parts
Solder wick
Flux
Cleaning