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Parts of a Mobile Cell Phone and Their Function (Big Parts)

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.

Mobile Phone PCB Diagram with Parts

Mobile Phone PCB Diagram with Parts

Big Parts of a Mobile Cell Phone and Their Function:

  1. 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.

  2. P.F.O: It is found near the Antenna Switch in the Network Section of the
    Cell Phone PFO

    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.

  3. 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.

  4. 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.

  5. 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”.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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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Santosh Das is an Electronics Engineer, Blogger, Young Entrepreneur and Founder of this Mobile Phone Repairing Website. Santosh possesses vast experience in the field of electronics, telecommunication, Soldering, SMT, ESD Safety, and electronics manufacturing tools, equipment and consumables. Santosh left his job in 2014 and started his own Private Limited Company that deals and supplies PCB Assembly and Rework Tools, Equipment and Consumables. Keep visiting for daily dose of Tips and Tutorials.

24 Responses to Parts of a Mobile Cell Phone and Their Function (Big Parts)

  1. yaminali49@yahoo.it' mohammad yamin says:

    i like your repairing system and i hope you will release more videos and audios.
    thanks

    • Santosh Das says:

      Thanks for your visit and appreciation. I will certainly write more articles, and will upload more useful photos and videos related to mobile cell phone repairing.

  2. satdcelectronics@gmail.com' tharanga says:

    thanks. i like this site

  3. ocakam@gmail.com' Ocaka Mike says:

    Thanks for the simplified guide on mobile phone repair

    Thanks

  4. Monamdsj@gmail.com' P.Monagarashu says:

    Thnx i got more info it’s very useful for me

  5. ayaza10@yahoo.com' ayaz ali says:

    i liked this site so much and i got alot of guidance from this.

  6. godwinmaga6@gmail.com' Godwin says:

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  7. iloveu894@gmail.com' gopal says:

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  8. gmvijay393@gmail.com' gopalm64 says:

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  9. alex67049@gmail.com' Alazar kebede says:

    It is good i like it

  10. nepalikta22@gmail.com' sanjib says:

    sir how to change nokia 3200 display

    • Santosh Das says:

      It is same as changing display of any other mobile phone. I have already published an article on how to change / replace mobile phone display.

  11. baryalaydelsooz@gmail.com' BARYALAY says:

    Hi tanks for your this site now i am very happy because i can solve my broblem

  12. mrmarakani98@gmail.com' MRM Arakani says:

    Awesome page to learn awesome repairing knowledge…and so many thanks to you…

  13. mrmarakani98@gmail.com' MRM Arakani says:

    Bro,in my Symphony B2 there I can see a headphone logo and can’t remove it,I wanna help about that….

  14. ranjan_access@yahoo.com' ranjan says:

    nice n helpful.

  15. mutethia@gmail.com' mutethia says:

    which phone is this i cant follow diagram with mine .

  16. albertoakes24@gmail.com' OAKES says:

    this is great guys was jus looking for this great stuff about repairing mobil phones your diagrams are easy to understand send us more stuff guys thanks

  17. horepears@gmail.com' The illuminator says:

    thanks !!! doubtless you are people , and wisdom abides in you

  18. willie_ato@yahoo.com' Ato willie says:

    Am very happy with the lesson, Thanks Good day

  19. karbharisalim@yahoo.com' salim says:

    I search many website but this is awesome

  20. thenalarasube@gmail.com' rock says:

    This site good but need improvement..i.e,faults are given here but why that faults arises are not given.for example,if there is any fault in antenna switch no networks it says but it not says why fault arises in antenna switch.By adding which means the site is 100% okay i think soo…

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