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

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
Cell Phone PFO

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

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

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

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

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

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

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

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

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

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

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)

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

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

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

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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