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Power IC It takes power from the battery and supplies to all other parts of a mobile phone Oscillator It creates frequency during outgoing calls Displays data. It is connected to Screen or display following signals : the CPU to receive LCD Data Signal, LCD Reset Signal, LCD WR Signal, LCD RD Signal, LCD FLM Signal, LCD HSYN Signal Flash IC etc. Stores the software and other programs installed in the mobile phone Charging IC CPU Takes the current from the charger and charges the battery Controls all sections of a mobile phone Receives and transmit radio frequencies Antenna and helps the phone to connect to the cellular network Figure 5 below shows a printed circuit board (PCB) of a mobile phone showing the different internal parts. As you can see from this diagram the PCB is divided into two parts, the network section and the power section. The network section controls the incoming and outgoing phone calls, while the power section controls the memory and power related functions of the phone. Figure 5: Parts of a mobile phone We hope you now know the different parts of a mobile phone and their functions. Make sure that you learn them well and are be able to locate them easily before you move on to the next section. Let us now look at the tools that you need to repair mobile phones. Page 12