Mobile Phones of any brand such Samsung, Nokia, Motorola and etc are divided into 2 major parts. This parts are the Network Section and Power Section.When
identifying parts, electronic components and ICs on the PCB of a mobile
cell phone, it is important to keep these two sections in mind.
How to Identify Parts and Components on the PCB of a Mobile Cell Phone:
- 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.
- 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
- PFO: Power Frequency Oscillator. It is present beside the antenna switch.
PFO of a Mobile Phone
- 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.
- 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
- 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
- Flash IC: This IC is found beside the CPU.
Flash IC of a Mobile Phone
- Logic IC: The IC with 20 legs is the Logic IC.
Logic IC of a Mobile Phone
- Charging IC: In the Power Section, the IC beside R22 is the Charging IC.
Charging IC of a Mobile Phone
- Audio IC: The IC parallel to Power IC is the Audio IC.
Audio IC of a Mobile Phone
NOTES:
- UEM (Universal Energy Manager) = Logic IC + Charging IC + Audio IC + Power IC
- PFO (Power Frequency Oscillator) = Antenna Switch + PFO
- Flash IC= RAM + Flash IC
Mobile Phone PCB Layout Diagram
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