Soldering the component to the PCB board is the most crucial and hardest process in producing a complete circuit. If the component is over heated or the solution from the iron touch another part of the PCB board, the circuit will face some faulty and error. In this case, troubleshooting and disordering need to be done by testing the complete circuit by using batteries and LED. If the circuit face some error, the component need to be detached from the board. This process took the longest time to be accomplish compare to other process.