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....
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.
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How to Identify Parts and Components on the PCB of a Mobile Cell Phone:
- 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.
- 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
- PFO: Power Frequency Oscillator. It is present beside the antenna switch.
PFO of a Mobile Phone
- 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
Power Section: This section is below the Network Section.
- 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
- 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
- Flash IC: This IC is found beside the CPU.
Flash IC of a Mobile Phone
- Logic IC: The IC with 20 legs is the Logic IC.
Logic IC of a Mobile Phone
- Charging IC: In the Power Section, the IC beside R22 is the Charging IC.
Charging IC of a Mobile Phone
- Audio IC: The IC parallel to Power IC is the Audio IC.
Audio IC of a Mobile Phone
NOTES:
- UEM (Universal Energy Manager) = Logic IC + Charging IC + Audio IC + Power IC
- PFO (Power Frequency Oscillator) = Antenna Switch + PFO
- Flash IC= RAM + Flash IC
Mobile Phone PCB Layout Diagram
Related Posts:
- Mobile Phone Dictionary
- Mobile Phone Repairing Tools
- Card Level Parts of a Mobile Phone
- Parts of a Mobile Cell Phone and Their Function (Big Parts)
- Small Parts / Electronic Components of Mobile Phone and Their Function
- Counting Legs or Pins of IC
- Current | Electric Current | AC (Alternate Current) | DC (Direct Current)
- Circuit Symbol / Circuit Schematic Symbols of Electronic Components
- How to Check Mobile Cell Phone Settings
- How to Open and Disassemble a Mobile Cell Phone
- How to Use Multimeter
- How to Jumper in Mobile Phone Repairing
- Smartphone Repairing
- Electronic Components & Parts & Their Function
Please
My Oneplus 5 Device is facing Screen Freeze issue from last few months which gets temporary resolved after multiple reboots , sometime single reboot sometime it didn’t wakes up for 2 days. Now after fighting this battle for months my phone is dead. Display works, everything in the phone works (can see notifications getting recieved , battery getting charged, Network reception on place), just my screen doesn’t respond to my touch. As discussed with Oneplus service center , it is a manufacturing defect in motherboard which is faced by many user who have replaced there motherboard during warranty but i started facing it after my warranty expired.
Now i want to know which component in motherboard can cause this issue where everything is working in background , display is working but screen is not responding to touch.
The Phone Display is Made up or 2 Parts – Main Display and Touchscreen. Both are 2 Different Parts. You may have to Just Replace the Touchscreen not the Main Display.
Hi Santosh sir you blog is very informative and helpful for all mobile repair engineer.
Can you pls explain mobile power sequence from vbus to vbat to all section.This will be very helpful for Dead mobile repair…
Hi, Could the IC be damaged if the mobile felt on ground and screen damaged?
In most cases NO IC will not get damaged.
My phone faile to switch on what should i do?
Get the Battery connector checked.
sir how to identification to all IC
hi sir, my charging current is unstable and sometimes wont charge at all shows at 0mah is it charging ic? cause i tried several plugs and cable the result still the same
Yes.
hello sir … are you provinding any mobile reparing courses
NO.
My Samsung A3 2016 has gone off. With the charger plugged in u can on it. It goes off as plug the charger out. I’ve replace several batteries still the same, batt is abt 3.94v. It can charge the battery to 100% but goes off as u remove the charger.
What do I do??? Pls help, thank U
It is showing FALSE Charging. Get the Battery Connector and Charging IC Checked.
Reset the Phone and Check. You can also try to check the SIM Connector with Petrol or alcohol and Check again.
Hello sir, my micromax unite 2 is dead.. capacitor and diodes are in ok voltage range..what the other possible problem in it..??
You have to check how the phone got dead and then diagnose.
I have dismantled an old Nokia, are any of the parts dangerous to handle or otherwise. I intend to use them as part of an art project.
No, nothing is dangerous.
I have checked sir but not work any other ideai sir
They clean the PCB with IPA and Flux and Apply some Hot Air.
Sir i have note 1 samsung
When i put to charge it apear CHARGING PAUSED BATTRY TEMRETURE TOO LOW i wil change charging full set but not repair i changed battry also but not repair i did reset but not work what can do sir pleas give any ideai
There is shorting on the PCB. Get it checked.
Sir my Samsung galaxyJ7 went off immediately i plugin faulty charger, what should i do,?
Boost the battery using Battery Booster and Check. Otherwise Start the Phone using DC Power Supply.
Thank you for this share, I have Sony Z3 compact and it is not charging anyomore. Now I can identify Charging IC and repair it.
Best regards,
Lopar
Please Read my Article on How to Identify Small Parts of a Mobile Phone.
Sir mobile me lagnne wake component me baste me baton
Ok. Will write an an article and make a video very soon.
plz send Mobile repair course in PDF
PDF is already there on this site.
Hello team!
Please can anybody support here? I am looking for the catalog of spare part for smartphones? like image+name of the part. FPC, giftbox, PCBA, EVA GB….
Thanks!
I think you should Buy a Book. It is very difficult to publish such a book on a blog.
hello sir I have multi mobile but not comming tower what is probalm
Which is the component(ic) responcible for charging of smartphone in it’s motherboard
Earlier it was the separate charging IC but now most companies are combining them together in the power IC.
Zen admire glam software problem
Lgk520dy it say no service both sim i change the software but not solve my problem i cheque my imei its correct please give me a solution to this problem
Did you change the SIM and Check? If the SIM is OK then clean the SIM Connector with IPA or Alcohol or Petrol.
yes sir i have nokia lumia 635 but the flight mode cannot turn off and i have flash the phone still not working. i need help to locate the flight mode ic so that i can remove it by myself please help me out
Did you RESET the Phone? Did you get the OS Reinstalled? First do these.
its not working fakee…
Iphone 6 no service or searching problem. Tried everything from updating to resetting network settings.
Could be problem with some IC, probable the Network IC. It has to be replaced.
Hello I’ve had a problem with my Xperia Z3 where I get a poor LTE signal and constant loss of GPS during use of Google maps now that I got the phone apart to fix the screen will swapping out the PCB board fix this problem?
This is problem of the phone. You cannot do much. Update the Software and check.
Don’t think it’s a software issue but if any thing I could try flashing a different firmware as there is no more updates for this phone it’s a Rogers phone from the east coast and I’m a Fido customer on the west coast basically the same network so I don’t know it could be a problem in the motherboard with one of the components and yes if so there’s not really a fix
Flash the same software again.
where i can bye PFO: Power Frequency Oscillator ic for Mi4c mobile.
You can get it at you local vendor.
I am from Nepal and here i does not success to found PFO for Mi4c. Would you please give me the address where i can bye it at Panjab, Lucknow, Delhi. or If you help me to sent it from couriour it will be very very please for me. Thanking you.
You can get it from the Local Market.
Sir smartphone ka HDMI part hai ya nhi.?
NO.
how i idendify ram any part number no for 2 gb or 3gb ram
sir PCB bord mobile ka kav aya tha or kisne iski khoj ki thi
Martin Cooper of Motorola made the first mobile phone. But who manufactured the PC B is not known.
Hai Sir…
I just saw your lectures today, There were many clarifications, They are satisfied with me.
Are there any clarifications about new Android motherboards? Eg: SAMSUNG A3, J7, NOTE 5.
nice sir sorting nahi ja rahi 750 aa rhy hai samsung ka b313 hai mobile aur na hi on ho raha hai kya kru
reply plese sir
Thank you so much santosh your really helped me.
wow all basic guid for mobile repairing is availble hear
keep it up
Hi Das ,
this is santhoshkumar i have blackberry 8520 curve it is not working now i don’t what is problem will you please help me
What is the problem with the phone? Is it completely dead? If Yes, then please get it serviced.
Dear Das.
Many many thanks for your fruitful complete guidance towards the repairing of different kinds of mobiles. I found very simple and easy to understand all the componetns included in the mobile set. Thanks for sharing your valuable knowledge. Keep it up!
Regards
Tanks alot ur infor is gud
This site so useful to me
thanks for guidance
very helpfull site
for mobile repairing
thankyou so… much
Thank you
Thanks for your help, I learn more about phone repair now and am very happy, am looking forward to hear from you any information
am very interesting to learn how to repair phones
Sir muje smart phone ki pcb dek ne ke liya kya krna hoga
Dear sir, M Nagaraj from karnataka! Sir, i learned mobile repaire course recently, i will open mobile service shop! How to prepare give tips?
Sir pls muze koi mobile repair ki hindi pdf file send kro…. iam waiting
Dear sir,
God bless u, I learn alot about various parts of cell phone, its quite interesting nd exciting to know about chip level work.
I wants to quinch my threst of knowledge kindly send more things like that.
Important to learn about this thanks
–
please any information share with me
thanks
Nice
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..
Thanks
The lesson is very interesting Good day
Improve my confidence
Thank you very much for your service.
I got phone repair knowledge from you.Later I will learn and visite to your site.
nice informaction
I have done course in handset repair problem is where I can get valuable certification exam which exam I can write
all good but how to know what big pcb part I’ have to change ,how to testing big part with multimeter ???%
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?
Tracks of different models are available in the market. You need to find them in stores that sell mobile phone accessories and tools.
no services message on screen
RESET The Phone to fix the problem.
LG P350 network not working
plz help me
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.
keep it up friend .really very thanks to u my friend
Hi Its very good thank for Sharing its very helpfull i hope you update more info thank
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.
Thank u sir and same publishing laptop services
Thanks sir ur side is best.i hope always you help me thanx alots
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
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.
God will bless you for help us .thanks
Excellent work guys, Really helpfull Thanx
Hi,
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.
Thanks
You have to replace the Display LED. These are SMD LEDs that provide front and back light to any mobile cell phone.
sir, your tutorial is 100 percent useful and helpful please keep it up.expecting more tutorial in advance.
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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 .
how to check the track for speaker problem for jumpering….where it starts and where it should end
You will need Track Diagram of different models. Books are available in the market and online.
Thanx Alot This Site is very helpful Keep It Up
to be honest i found your lesson so amazing and teaching. keep it up
Hi God bless you so much, you’ve really changed and shaped my destiny through this tutorials
very nice.I am a beginner in mobile servicing field.Your contents are very easily understandable.Thaaanks a lot…………
It is good Keep it up!!!
Thanks for the appreciation.
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