Mobile Phone Fault Finding for Mobile Cell Phone Repairing

Learn Mobile Phone Fault Finding for Mobile Cell Phone Repairing.

Mobile Phone Fault Finding for Mobile Cell Phone Repairing – In order to repair any mobile cell phone, we must find and know fault or problem present in Different Sections of Mobile Phone, Parts and Components. If we know about problems of different parts and components present in different sections inside a mobile cell phone then we can easily repair the fault by checking the component.

Mobile Phone Fault Finding

Mobile Phone Fault Finding

Mobile Phone Fault Finding Method – Problems, Identification & Troubleshooting

While doing mobile phone repairing, we can do fault finding if we know different sections inside a mobile cell phone. For Example – If there is Network Problem in a mobile phone then we can easily repair the phone if we know different parts, components and their function in the Network Section.

NOTE: This Lesson is on Fault Identification and Troubleshooting of Problems. It is Not about Testing Methods. For Component Testing Methods, Please Read: Mobile Phone Repairing Testing Methods

Following are different electronic parts and components in different sections inside a mobile cell phone:

Mobile Phone Repairing

Mobile Phone Repairing

1. Network Fault

Antenna Switch, PFO, FEM, RF IC, VCO, RX-Filter, TX-Filter, RF Antenna, RF Crystal, External Antenna Socket, Network Signal and Supply Control and Interface Section.

If we know about the parts and Electronic Components present in the Network section and their function then we can easily repair the fault by looking at the code number of the faulty component in the Circuit Diagram and Different PCB Layout Diagram.

In this way we can easily make good use of circuit diagram for mobile cell phone repairing.

2. Power ON Fault

Battery (3.7 V), Battery Connector Jack, Power IC, CPU, Flash IC, S-RAM IC, RF Crystal, RF Clock Section Component, RF IC, Power ON / OFF Trigger Components.

3. Charging Fault

Charger (5-6 V), Battery (3.7 V), Charger Connector, Charger Volt Fuse, Coil, Charger Over Volt Protector, Charging IC, Power IC, Charging Regulator, Charging Volt Output Components, Charger and Charger Volt Detector Components.

4. SIM Fault

SIM Card, SIM Socket, SIM Signal and Supply Interface Components, Resistance, Coil, Power IC, CPU etc.

5. Ringer Fault

Ringer, Ringer Signal Input and Output Components, Audio Amplifier IC, Power IC, CPU etc.

6. Ear Speaker Fault

Ear Speaker, Ear Speaker Signal Components, Audio Amplifier IC, CPU, Power IC etc.

7. Micro SD Card Fault / MMC Fault

Micro SD Card, Micro Card Connector, Micro Card Detector Switch, Micro Card Detector Signal Components, CPU etc.

8. USB and Bottom Connector fault

USB and Bottom Connector, USB and Signal Interface Connector Components, USB Signal Interface IC, USB Driver IC, CPU etc.

9. Keypad Fault

Key Tip, Key Pad Dot Sheet, Key Signal Filters, Key Signal Varactors, Key Board to Key Connector, CPU etc.

10. Display Fault

LCD, LCD Connector, LCD Supply Components, LCD Signal Interface Filter IC, CPU, LCD Signal Interface Resistance etc.

11. MIC Sound Fault

MIC, MIC Interface Connection, MIC Signal and Supply Components, Power IC, CPU etc.

12. Backlight (LED) Fault

LED, Backlight Driver IC, Backlight Driver Section Components, Power IC, CPU etc.

13. Bluetooth Fault

Bluetooth Antenna, Bluetooth Driver IC, Bluetooth Section Crystal, CPU etc.

14. FM Radio Fault

Hands Free Lead, Hands Free Connector, FM and Bluetooth IC, FM Driver IC, CPU etc.

15. Vibrator Fault

Vibrator Motor, Vibration Supply Components, Power IC, Vibrator Driver IC etc.

16. Touch Screen Fault

Touch Panel / PDA Panel, Touch Panel Control IC, CPU, Signal Interface Parts etc.

Mobile Phone Fault Finding FAQs

If your mobile phone is frozen or unresponsive, you can try restarting it by holding down the power button for 10 seconds. If this doesn't work, try removing the battery and SIM card for a few minutes before reinserting them and turning the phone back on. If the issue persists, you may need to seek professional help.

If your mobile phone is not charging, it could be due to a faulty charging cable, a damaged charging port, or a drained battery. Try using a different charging cable and/or charger to see if that resolves the issue. If not, you may need to replace the charging port or battery.

If your mobile phone screen is cracked or damaged, you can try purchasing a screen replacement kit online and following the instructions to replace the screen yourself. However, this can be a difficult and time-consuming process, and it may be best to seek professional help from a phone repair shop.

If you are experiencing network connectivity issues with your mobile phone, you can try restarting your phone, turning airplane mode on and off, or resetting your network settings. If these steps do not work, you can contact your mobile network provider for assistance or take your phone to a repair shop to diagnose and fix the issue.

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Santosh Das

Santosh is an Electronics Geek, 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, Keep visiting for daily dose of Tips and Tutorials.

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89 Responses

  1. Alista Asa says:

    After rebooting my phone several times. The phone is now dead. No power

  2. Daman says:

    Pattern Lock, Number Lock Kise kulna hai woh bhi bataye na, Sir Specially Vivo Mobile Phone. Redmi, Oppo, Oneplus etc itna jururi nhi hai jadha tar Vivo ka chahiye ji

  3. I got my glass replaced but my touch is not working and my phone is not charging also. Screen and display are perfect but the touch is unresponsive

  4. Saajan gowala says:

    Dear Santosh Sir…I have read your blog and website it’s very knowledgeable important for new technicians , I have a request for you the blog and website history convert to hindi language…???

  5. I have problem with my samsung s8.my phone ringer having problem.i got it repaired 2 times..whenever i used handsfree on my fone my fone ringer got faulty.pls help me

  6. Hi sir

  7. ETIENNE says:

    MY MOBILE PHONE IS DEAD, IT GIVES VIBRATING INDICATION THATY IT WORK. TRIED TO FLASH IT DOESNT WORK. ITS A HISENSE U965.21-DF. PLS HELP. GOD BLESS YOU FOR UR PATIENCE AND UNSELFISH ATTITUDE

  8. Jai says:

    In My iPhone5s back camera not function
    How to solve the problem?

  9. M Dutta says:

    I am a computer hardware teacher and technician. I have Swipe Elite 2 Plus mobile. I want to upgrade it’s software to android 9. If it is possible, please can you please tell me how can I do it by using my laptop?

    • It can be done by Flashing the Software. I have already posted on how to flash. You can read or get the phone flashed by some local technician. It does not cost much.

  10. jentle p says:

    I have a problem in repairing a dead infinite phone and not charging as well , have change the battery, check the battery connector, the power button and I also change the charging port but still the phone is not switching on, pls help me with this sir
    Thanks in advance sir.

  11. ABUBAKAR NAFIU OLADELE says:

    Thaks daddy,sir how can I know how to trace fault in mobile phone repair?

  12. Hello sir I want to learn about unlocking and flash. Of all phone what do I need to to start with.

  13. Kamaa says:

    My it1408 no flashlight n camera it shows camera error, advice

  14. Samuel says:

    Please sir i need guide on how to repair phone

  15. Maico says:

    Hello sir pls I want yo ask a solution for dead phone what are the solution to it sir

  16. Ranjit says:

    Sir I a mi note 5a prime blank display I change LCD but it’s same can I jumper display filter ic

  17. Hello sir i have a galaxy s2 whenever i received a call the person cant hear i had the microphone replace however the problem still not fix. The ringtones is ok, playing videos the sound is ok its just that when durimg a phone call the person cant hear me on the other side. Could it be a board issue or software problem

    • This is surely MIC Issue. Get it checked properly.

      • Hello sir having issues with touch screen is specially Hyundai phones the problem am having is that whenever the phone is not in used the touch works but no sooner that you start use it one side of the phone not touching. The touch is not connected to the logic board or any thing.

        • Disassemble the Phone and Check if the Touchpad Connector is Properly Fitted. Otherwise, it can be partially faulty and needs replacement.

        • Hello sir I recently got a zte zenmax I notice that the sim is detected and registers on network but say it’s saying no service. Some time pick up one or two bars but go off shortly.

  18. Mercy Ezekiel says:

    Hello sir.. Please am working on Tecno t349 The problem is the power solution, and i have tried my best but I don’t know what to do again.please help.

  19. motale says:

    sir its a pleasure reading through your work. sir how can train some one one mobile phone repires. im very intrested. u are my mentor

  20. owoso oluwaseyi says:

    Hello, mr Santosh Das please i need knowledge on how to repair phone that is charging but dos not retain charges. And also how to repair dead phones, and how to troubleshoot different parts of phone
    Thanks

  21. the phone can be in download mode for hours but cant boot

  22. also unlocked bootloader for the problem to resolve . for fastboot commands.

  23. i have Huawei ALE-L21 which has restart problem. flashing firmware ok, goto recovery ok, but cant boot. the restart is not at same place sometime at begining of logo sometimes after logo.

  24. Sumit says:

    Sir Mera name sumit hai mere pas lyf Ka fon hai jo ki on krne per logo ane ke, 30second k Ander band ho jata h iska koi solution btao plz.

  25. punya says:

    Sir how to know fluently repair

  26. Hello sir am one of your grate’s fan on pcb.? I bought a lg g4 on amazon unlocked and when i put my chip in it it shows the contact but cant connect to the network i try to set the apn setting but still no network i call tmobile and the say the imei is ok and they see no problem please hell

  27. Saddam says:

    Pls Sir send one mobile solutions book send my maill id

  28. nk says:

    like

  29. pee says:

    Thanks for this platform

  30. Sunil Kumar says:

    Nice

  31. lucy zimba says:

    Am LUCY , my child puts inote phone in her mouth and after few minutes it it stop responding to touch but it displays everything , for example , if someone call lam able to see that someone is calling but l can not be able to pic it. so whats wrong with the phone and how can l solve such problem

  32. Hello sir I want to learn about phone flashing and unlocking. What do i need.

  33. Md Wasim Abbas says:

    hello sir i am md wasim abbas and i want to learn mobile repairing please sir help me with some advise.

  34. Prince says:

    De ar Santosh, am preparing a work bench for mobile phones repair. Is there any equipment for detecting faults on mobil phone and other electronics?
    Thanks in advance

    • You must have following on your Work Bench:
      1) ESD Mat with Proper Grounding.
      2) ESD Wrist Strap to wear on your Wrist.
      3) A Good Soldering Station or Iron (ESD-Safe)
      4) A Good Hot Air Blower (ESD-Safe)
      5) Digital Multimeter, DC Power Supply, Set of Opening Tools, Set of Screwdrivers, Set of Tweezers.
      6) Good quality of Solder Wire and Paste, Solder Flux, IPA
      7) Laptop and Software Boxes.

  35. Mclean says:

    Please I have Samsung galaxy blaze and I have problem with the power switch.I think I have lost the positive part and I scratch the board till I met the point but its soo close to the negative so when I solde it the it join together making the the phone on direct when battery insert please can you help me with the power way on the board ?

  36. patrick says:

    My phone isn’t detecting sd card give me a solution.

  37. Nirmal says:

    I have a UBISLATE TAB . Its touch is not working. Tell me some tips

  38. Hashmat says:

    Sir my mic a120 hang problem
    tell me any way plz

  39. Charles hill says:

    I need phone repairing book or pdf

  40. sp says:

    Very very nice

  41. Ismail says:

    sir,
    Samsung sgh-e250 this is problem that when switch on light come on display suddenly power off please help me

  42. dilip choudhary says:

    my karbonn a10 charging show but battery nut charging i changes charging socket plz given solution

  43. tim says:

    This site is full of info. Thanks for your effort.

  44. k t nishchith says:

    I have karbonn A15, it is switched off 3 days back. but it is not powering on/ can not charging fully dead. I dont know? Please give me solution

  45. IMANI ALPHONSE says:

    Thanks a lot i would like to add double line phones how to repair it

  46. niwas says:

    like

  47. iftikhar ahmed says:

    this is a really good side to learn about mobile phone thanks to the this site team

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