A motherboard or a main board of an iPhone 6s plus phone or computer is the main printed circuit board. The motherboard has several components including CPU, memory and it also provides connections for other components. The motherboard of iPhone 6s Plus also has several components and provides support to many units inside the system of the phone including processor and memory.The iPhone 6s Plus is a small computer which does millions of calculations within seconds. It is more astonishing to understand that for the tasks a whole floor office was used a few decades ago are done within the palm of your hand i.e in iPhone 6s Plus. Hence, the worst harm that can happen to your iPhone 6s plus is to the motherboard. However, it is not an irreparable problem and MyCelCare has a team of experts who are always available to help you out with this.