The motherboard is also referred to as a PCB or a logic board and is sandwiched exactly in the middle of the smartphone, right below the screen and above the battery and the back panel. All the components in the motherboard get their power supply from the battery. The motherboard often comprises the camera slot, a flash IC, RAM, antenna switch, power section, CPU, audio/speaker connection, SIM slot and Integrated Circuits. All the parts in a smartphone are directly or indirectly connected to the motherboard of the smartphone.