There are all kinds
of parts and electronic components in a mobile cell phone. These parts and
components can be divided into Big Parts and Small Parts. This article explains
all about big parts and components in a mobile cell phone and their function.
When learning how to
repair a mobile cell phone, it is important to identify its parts and
understand their function. Here I must also remind you that any PCB of a mobile
phone is divided into 2 sections namely: Network Section; and Power Section.
Have a look at the image below to understand PCB of a mobile cell phone.
Big Parts
of a Mobile Cell Phone and Their Function:
Antenna
Switch: It is found in the Network Section of a mobile phone Cell Phone Antenna
Switch
Cell Phone
Antenna Switch
and is made
up of metal and non-metal. In GSM sets it is found in white color and in CDMA
sets it is found in golden metal.
Work: It
searches network and passes forward after tuning.
Faults: If
the Antenna Switch is faulty then there will be no network in the mobile phone.
P.F.O:
It is found near the Antenna Switch in the Network Section of the
PCB of
Mobile Phone. It is also called P.A (Power Amplifier) and Band Pass Filter.
Work: It
filters and amplifies network frequency and selects the home network.
Faults: If
the PFO is faulty then there will be no network in the mobile phone. If it gets
short then the mobile phone will get dead.
RF IC /
Hagar / Network IC: This electronic component found near Cell Phone Network IC
/ RF IC
Cell Phone
Network IC / RF IC
the PFO in
the Network Section of a Mobile Phone. It is also called RF signal processor.
Work: It works as
transmitter and receiver of audio and radio waves according to the instruction
from the CPU.
Faults: If the RF
IC is faulty then there will be problem with network in the mobile phone.
Sometimes the mobile phone can even get dead.
26 MHz
Crystal Oscillator: It is found near the PFO in the Network Mobile Phone 26 MHz
Crystal Oscillator
Mobile
Phone 26 MHz Crystal Oscillator
Section of
a Mobile Phone. It is also called Network Crystal. It is made up of metal.
Work: It creates frequency during outgoing calls.
Faults: If this
crystal is faulty then there will be no outgoing call and no network in the
mobile phone.
VCO: It is
found near the Network IC in the Network Section of a Mobile Mobile Phone VCO
Mobile
Phone VCO
Phone.
Work: It sends
time, date and voltage to the RF IC / Hager and the CPU. It also creates
frequency after taking command from the CPU.
Faults: If it is
faulty then there will be no network in the mobile phone and it will display
“Call End” or “Call Failed”.
RX
Filter: It
is found in the Network Section of a Mobile Phone. Mobile Phone RX Filter
Mobile Phone RX
Filter
Work: It filters frequency during incoming calls.
Faults: If it is faulty then there will network
problem during incoming calls.
TX
Filter: It
is found in the Network Section of a Mobile Phone. Mobile Phone TX Filter
Mobile Phone TX
Filter
Work: It filters frequency during outgoing calls.
Faults: If it is faulty then there will network
problem during outgoing calls.
ROM: It is found in the Power Section of a Mobile
Phone. Mobile Phone ROM
Mobile Phone ROM
Work: It loads current operating program in a Mobile
Phone.
Faults: If ROM is faulty then there will software
problem in the mobile phone and the set will get dead.
RAM: It is found in the Power Section of a Mobile
Phone. Mobile Phone RAM
Mobile Phone RAM
Work: It sends and receives commands of the
operating program in a mobile phone.
Faults: If RAM is faulty then there will be software
problem in the mobile phone and it will get frequently get hanged and the set
can even get dead.
Flash
IC: It is found in the
Power Section of a Mobile Phone. It is also Cell Phone Flash IC
Cell Phone Flash IC
called EEPROM IC,
Memory IC, RAM IC and ROM IC.
Work: Software of the mobile phone is installed in
the Flash IC.
Faults: If Flash IC is faulty then the mobile phone
will not work properly and it can even get dead.
Power
IC: It is found in the
Power Section of a Mobile Phone. There are Cell Phone Power IC
Cell Phone Power IC
many small components
mainly capacitor around this IC. RTC is near the Power IC.
Work: It takes power from the battery and supplies
to all other parts of a mobile phone.
Faults: If Power IC is faulty then the set will get
dead.
Charging
IC: It is found in the
Power Section near R22. Cell Phone Charging IC
Cell Phone Charging
IC
Work: It takes current from the charger and
charges the battery.
Faults: If Charging IC is faulty then the set will
not get charged. If the Charging IC is short then the set will get dead.
RTC
(Simple Silicon Crystal): It is Real Time Clock and is found in Mobile
Phone RTC (Real Time Clock)
Mobile Phone RTC
(Real Time Clock)
the Power Section
near Power IC. It is made up of either metal or non-metal. It is of long shape.
Work: It helps to run the date and time in a mobile
phone.
Faults: If RTC is faulty then there will be no date or
time in the mobile phone and the set can even get dead.
CPU: It is found in the Power Section. It is also
called MAD IC, RAP IC Cell Phone CPU
Cell Phone CPU
and UPP. It is the
largest IC on the PCB of a Mobile Phone and it looks different from all other
ICs.
Work: It controls all sections of a mobile phone.
Faults: If CPU is faulty then the mobile phone will
get dead.
Logic
IC / UI IC: It
is found in any section of a mobile phone. It has 20 Cell Phone Logic IC
Cell Phone Logic IC
pins or legs. It is
also called UI IC and Interface IC.
Work: It controls Ringer, Vibrator and LED of a
mobile phone.
Faults: If Logic IC / UI IC is faulty then Ringer,
Vibrator and LED of mobile phone will nor work properly.
Audio
IC: It is found in Power
Section of a mobile phone. It is also Cell Phone Audio IC
Cell Phone Audio IC
called Cobba IC and
Melody IC.
Work: It controls Speaker and Microphone of a mobile
phone.
Faults: If Audio IC is faulty then Speaker and
Microphone of a mobile phone will not work and the set can even get dead.
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