How to Identify Parts and Components on the PCB of a Mobile Cell Phone:

1. Antenna Point: The point where antenna is connected is called antenna point. It is normally located at the top of the PCB of a mobile phone.

Network Section: The section below antenna point and above power section is called network section.

2. Antenna Switch: It is found in the network section. It is made from metal and non-metal. It has 16 points or legs. In some mobile phones, the antenna switch is merged with PFO.
   

   Antenna Switch of Mobile Phone
3. PFO: Power Frequency Oscillator. It is present beside the antenna switch.
   

   PFO of a Mobile Phone
4. Network IC: It is below or beside the antenna switch and PFO. In some mobile phones, the Network IC is merged with the CPU. E.g.: Nokia 1200, 1650, 1208, 1209 etc.
   

   Network IC of a Mobile Phone

Power Section: This section is below the Network Section.

5. Power IC: In the Power Section, the IC around which there are several brown-colored capacitors is called Power IC. In some mobile phones there are 2 Power ICs.
   

   Power IC of a Mobile Phone
6. CPU: Central Processing Unit. In the power section, the largest IC is the CPU. In some sets there are 2 CPU.
   

   CPU of a Mobile Phone
7. Flash IC: This IC is found beside the CPU.
   

   Flash IC of a Mobile Phone
8. Logic IC: The IC with 20 legs is the Logic IC.
   

   Logic IC of a Mobile Phone
9. Charging IC: In the Power Section, the IC beside R22 is the Charging IC.
   

   Charging IC of a Mobile Phone
10. Audio IC: The IC parallel to Power IC is the Audio IC.
    

    Audio IC of a Mobile Phone

NOTES:

1. UEM (Universal Energy Manager) = Logic IC + Charging IC + Audio IC + Power IC
2. PFO (Power Frequency Oscillator) = Antenna Switch + PFO
3. Flash IC= RAM + Flash IC
   

   Mobile Phone PCB Layout Diagram