What is a Reflow?
The term ‘reflow’ describes a process of briefly melting (reflowing) the solder on an electrical circuit board, in this case a laptop motherboard.
Why would you perform a Reflow on a laptop motherboard?
The solder used in laptop motherboards tends to degrade over time, becoming brittle and weak. It can change from being a solid block of solder into more of a honeycomb structure. This weaker solder joint can fracture causing tiny broken connections in the circuit, invisible to the naked eye. The idea behind performing a reflow is that it melts the solder, allowing it to form a solid block again and joining up the electrical circuit.
See more here, it uses a motherboard as an example
http://www.computerrepairtips.net/how-to-reflow-a-laptop-motherboard/
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