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Mobile Phone Parts Identification | How to Identify Parts & Components on PCB of Mobile Phone

When learning how 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 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:

  1. 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.

  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 Phone

    Antenna Switch of Mobile Phone

  2. PFO: Power Frequency Oscillator. It is present beside the antenna switch.

    PFO of a Mobile Phone

    PFO of a Mobile Phone

  3. 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

    Network IC of a Mobile Phone

Power Section: This section is below the Network Section.

  1. 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

    Power IC of a Mobile Phone

  2. 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

    CPU of a Mobile Phone

  3. Flash IC: This IC is found beside the CPU.

    Flash IC of a Mobile Phone

    Flash IC of a Mobile Phone

  4. Logic IC: The IC with 20 legs is the Logic IC.

    Logic IC of a Mobile Phone

    Logic IC of a Mobile Phone

  5. Charging IC: In the Power Section, the IC beside R22 is the Charging IC.

    Charging IC of a Mobile Phone

    Charging IC of a Mobile Phone

  6. Audio IC: The IC parallel to Power IC is the Audio IC.

    Audio IC of a Mobile Phone

    Audio IC of a Mobile Phone


  1. UEM (Universal Energy Manager) = Logic IC + Charging IC + Audio IC + Power IC
  2. PFO (Power Frequency Oscillator) = Antenna Switch + PFO
  3. Flash IC= RAM + Flash IC

    Mobile Phone PCB Layout Diagram

    Mobile Phone PCB Layout Diagram

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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.

36 Responses to Mobile Phone Parts Identification | How to Identify Parts & Components on PCB of Mobile Phone

  1. Hello very cool site!! Guy .. Beautiful .. Wonderful .. I will bookmark your site and take the feeds also?I’m glad to search out numerous helpful information here in the submit, we need develop more strategies in this regard, thanks for sharing. . . . . .

  2. Dagnevip@yahoo.com' Dagnachew says:

    It is good Keep it up!!!

  3. sdq786basha@gmail.com' sadiq says:

    very nice.I am a beginner in mobile servicing field.Your contents are very easily understandable.Thaaanks a lot…………

  4. darlingtonandambi@gmail.com' Darlington says:

    Hi God bless you so much, you’ve really changed and shaped my destiny through this tutorials

  5. wgeyehu@gmail.com' wayeso gebeyehu says:

    to be honest i found your lesson so amazing and teaching. keep it up

  6. hussain.slokhandwala@gmail.com' hussain says:

    Thanx Alot This Site is very helpful Keep It Up

  7. deone.dgpc@gmail.com' mr. X says:

    how to check the track for speaker problem for jumpering….where it starts and where it should end

  8. luhigaj@yahoo.com' luhiga says:

    Hi Sir,
    Thanks alot for time use to prepare the lesson to anyone who interest to learning,how to repair mobile cell phone, and alot you done well.I have appriciate yourjob. God bless you and your family.Iam learning to you .

  9. deeprehal1802@gmail.com' deep jaan says:



  10. menefrancis@nokiamail.com' mene says:

    sir, your tutorial is 100 percent useful and helpful please keep it up.expecting more tutorial in advance.

  11. sanjayrawat19@gmail.com' Sanjay says:

    Information’s provided by you is very very useful.
    I have one issue.
    I have given my Sony xPreia st23 (Miro) for repairing as theer was some water droplets inside.
    Technician told me that LCD terminals have gone and he proposed for LCD replacement.
    But after so many days he is not able to find right connection for backlight.
    Aleady he is able to see SONY logo but display not appearing even with a new LCD.
    Could you please guide with some pic or sketch how to fix the issue.


  12. jnaks07@gmail.com' Jose says:

    Excellent work guys, Really helpfull Thanx

  13. Sapporjoshua@gmail.com' Sappor Joshua says:

    God will bless you for help us .thanks

  14. aekarthickprasad@gmail.com' kARTHICK PRASAD says:

    Its really nice and easy for understanding. From now onwards i follow your site, if i feel any doubt in mobile servicing. Thanks for your support.

  15. zmemon77@yahoo.com' zahid says:

    this is very good site , i m new in this field i m learner i found its very very useful 100 % thax sir
    i hope i will get more help from you to learn this

  16. Ysolanki47@gmail.com' Yogendra singh says:

    Thanks sir ur side is best.i hope always you help me thanx alots

  17. vkdheiva@gmail.com' Dheivendran says:

    Thank u sir and same publishing laptop services

  18. nanakwame295@gmail.com' Nana Kwame says:

    Your site is wow b’cos you are impacting a lot about mobile cell phone not to me alone but to the world.May all the crew get more than understanding to continue teaching,blessed.

  19. rafikbhai@yahoo.co.in' RAFIKBHAI says:

    Hi Its very good thank for Sharing its very helpfull i hope you update more info thank

  20. r.veeru007@gmail.com' veeru says:

    keep it up friend .really very thanks to u my friend

  21. bikashsingh317@ymail.com' bikash singh says:

    LG P350 network not working
    plz help me

    • Santosh Das says:

      RESET The phone to fix the problem. Change the SIM and Check. If none of the 2 tips solve the problem then take the phone to service center.

  22. bikashsingh317@ymail.com' bikash singh says:

    no services message on screen

  23. dsambani@hotmail.com' dev says:

    Really I do appreciate your hard work in preparing the notes from beginning to end, for mobile repairing. Thanks a lot..
    I have one question, from where do we get track diagrams of different model?

    • Santosh Das says:

      Tracks of different models are available in the market. You need to find them in stores that sell mobile phone accessories and tools.

  24. silviu.tudorache91@yahoo.com' silviu says:

    all good but how to know what big pcb part I’ have to change ,how to testing big part with multimeter ???%

  25. manju93gibbs@gmail.com' manjunath says:

    I have done course in handset repair problem is where I can get valuable certification exam which exam I can write

  26. vishnu.bhanu2@gmail.com' bhanu teja says:

    nice informaction

  27. zazaelect@gmail.com' zaza says:

    Thank you very much for your service.
    I got phone repair knowledge from you.Later I will learn and visite to your site.

  28. pushpraj187@gmail.com' pushpraj says:

    Improve my confidence

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

    The lesson is very interesting Good day

  30. faizan.zak786@gmail.com' Faizan says:

    Sir you are awesome i am your big fan sir thank you so much for your notes about mobiles and repairing all are awesome and i am an electronics engineer and i know it is fantastics and all notes about parts and pcbs are very good…
    If want please give me a chance to work with you,in your company..

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