When learninghow to repair a mobile cell phone, it is important
to learn how to identify parts and components on the PCB of a
mobile cell phone. Identification of these parts and components is
not that difficult.The PCB of any mobile phone of any brand namely
Nokia, Samsung, Motorola, China Mobile Phones etc is divided into 2
Parts namely: (1) Network Section; and (2) Power Section. When
identifying parts,electronic componentsand 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 aMobileCell
Phone:Antenna Point: The point where antenna is connected is called
antenna point. It is normally located at the top of thePCBof a
mobile phone.Network Section: The section below antenna point and
above power section is called network section.1. 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 Phone2. PFO: Power Frequency
Oscillator. It is present beside the antenna switch.
PFO of a Mobile Phone3. 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 PhonePower Section: This section is below
the Network Section.4. 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 Phone5. 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 Phone6. Flash IC: This IC is found beside the
CPU.
Flash IC of a Mobile Phone7. Logic IC: The IC with 20 legs is
the Logic IC.
Logic IC of a Mobile Phone8. Charging IC: In the Power Section,
the IC beside R22 is the Charging IC.
Charging IC of a Mobile Phone9. Audio IC: The IC parallel to
Power IC is the Audio IC.
Audio IC of a Mobile PhoneNOTES:1. UEM (Universal Energy
Manager)= Logic IC + Charging IC + Audio IC + Power IC2. PFO (Power
Frequency Oscillator)= Antenna Switch + PFO3. Flash IC = RAM +
Flash IC
Mobile Phone PCB Layout Diagram
