Mobile Phone Repairing Testing Methods

Mobile Phone Repairing Testing Methods – Learn Hot & Cold Testing Methods of Mobile Phone Repairing for Fault Finding, Testing, Checking Mobile Components.

Mobile Phone Repairing Testing Methods – Fault Finding, Testing and Checking of Mobile Phone Parts, Components and Section of a Mobile Cell Phone can be done using following 2 methods at the time of repairing mobile cell phone. These methods can also be used for Fault Finding or  Testing and Checking Mobile Components.

Mobile Phone Repairing Testing Methods

Mobile Phone Repairing Testing Methods

Mobile Phone Repairing Testing Methods for Fault Finding of Mobile Components

Let us Understand these 2 Main Mobile Phone Repairing Testing Methods in Detail.

1. Cold Testing Method

When we check the value of Resistance Using a Multimeter at the time of mobile repairing and fault finding, it is called cold testing. There is no need to give any power supply to the faulty mobile phone from any equipment such as DC Power Supply or Battery during Cold Testing.

Diode Range and Beep Sound from the Multimeter is used to find fault in a mobile cell phone using the cold testing method of mobile phone repairing. In this testing method, the RED Probe of the multimeter is connected to the Ground of the Mobile Phone PCB and the BLACK Probe is touched at the Testing Points of the Mobile Phone.

During the fault finding and repairing process of each part, SMD Electronic Component or Mobile Phone Section, following correct values will be received:

  1. Ear Phone Connector Tip (+ , -): .500 to .700
  2. Loud Speaker / Ringer Connector Tip (+,-): .300 to .600
  3. Battery Connector Tip (+): .400 to .500
  4. Battery Connector Tip (Sense): above .800
  5. Display Connector Supply Pins: .250 to .400
  6. Display Connector Signal Pins: .500 to .800
  7. Camera Connector Supply Pins: .250 to .400
  8. Camera Connector Signal Pins: .600 to .900
  9. Key Tip (Row and Column): .400 to .800
  10. Charger Connector Tip: .600 to .700
  11. Vibrator Motor Connector: .40 to .500
  12. Power ON / OFF Switch Point (+): .600 to .900
  13. MIC Connector Tip (Analog MIC) (+,-): .700 to .900
  14. Battery Charging Out Point (+,-): .300 to .400
  15. SIM Card Connector Pin 1 (VSim): .500 to .700
  16. SIM Card Connector Pin 2,3,6: .400 to .800
  17. SIM Card Connector Pin 4 (GND): .00 (Beep)
  18. Micro SD Card Connector Pin 4: .500 to .600
  19. Micro Card Connector Pin 6 (GND): .00 (Beep)
  20. Micro Card Connector Pin 1,2,3,5,7,8: .600 to .800
  21. RTC: .400 to .500
  22. Data RX and TX Pins: .600 to .700

2. Hot Testing Method

This is the second method of fault finding and repairing any mobile cell phone. Hot testing method is used when the fault cannot be found or when the phone cannot be repaired using the Cold Testing Method.

In this Process, VOLTAGE of damaged part, component or section of a mobile phone is checked. The fault is found by giving Power Supply to the mobile phone with a Battery OR DC Power Supply.

In this method, DC V (DC Volt) range of the Multimeter is selected. The BLACK Probe of the multimeter is connected with the Ground of the Mobile Phone PCB and the RED Probe is touched at the Testing Points.

During Hot Testing method, Voltage of different part or sections should be as follows (All Values in Volt):

  1. Ear Phone Connector Tip (+ , -) during working: .0 to 2.5
  2. Loud Speaker / Ringer Connector Tip (+,-) during working: .0 to 2.5
  3. Battery Connector Tip (+): 3.7
  4. Display Connector Supply Pins: 1.8 to 2.9
  5. Display Connector Signal Pins During Working: .0 to 1.8
  6. Camera Connector Supply Pins: 1.8 to 2.9
  7. Camera Connector Signal Pins During Working: .0 to 1.8
  8. Key Tip (Row and Column) One Side: 1.8 to 2.8
  9. Charger Connector Tip: 5 to 6
  10. Vibrator Motor Connector Tip During Working: 1.9 to 3.6
  11. Power ON / OFF Switch Point (+): 3 to 3.6
  12. MIC Connector Tip (Analog MIC) (+,-): 1.8 to 3.0
  13. Battery Charging Out Point (+,-): 3.7 to 4.2
  14. SIM Card Connector Pin 1 (VSim) When SIM Connected: 1.8 to 3.0
  15. SIM Card Connector Pin 2,3,6 During Working: 0 to 2.8
  16. Micro SD Card Connector Pin: 2.8
  17. Micro Card Connector Pin 1,2,3,5,7,8: 0 to 2.8
  18. Data RX and TX Pins: 1.8 to 2.8

Mobile Phone Repairing Testing Methods FAQs

The most common testing methods used to diagnose mobile phone issues include visual inspection, battery testing, connectivity testing, camera testing, and software testing. These tests help to identify problems with the phone's hardware or software components, such as faulty batteries, broken screens, damaged cameras, or software glitches.

Yes, you can test your mobile phone's battery without special equipment by using the phone's built-in battery testing feature or by downloading a battery testing app from the app store. These tools can provide information about the battery's health, charging capacity, and remaining lifespan.

To test the connectivity of your mobile phone's network and Wi-Fi, you can try accessing the internet or making a phone call. If you encounter issues with either of these, you can try resetting your network settings, checking your Wi-Fi connection, or contacting your service provider.

The most common software testing methods used to diagnose mobile phone issues include resetting the phone to its factory settings, performing a software update or downgrade, or using diagnostic software to identify software-related problems. These methods can help to resolve issues with app crashes, slow performance, or other software-related issues.

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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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54 Responses

  1. habineza charles says:

    a interested

  2. Ararsa says:

    I have got many knowledge from your sites. My question is which range of multimeter must be selected during cold testing?

  3. aden says:

    hi sir tanx for the tips. If you don’t mind I were wondering if you recommend me a way or tip to identify cell phone components like Rx and Tx filters… on PCB

  4. Anwar says:

    Hi sir,
    I am Anwar,
    I have a question can you please help me with that ?
    Sir how to check capacitors is shorting or not on board in series connection? Please reply to me as soon as possible. Thank you.

    Or please reply to my WhatsApp number 9390925504

  5. rachel frampton says:

    My sister would like to have her phone repaired because its screen is already cracked. Well, I admire your opinion about the importance of using the multimeter for cold testing. It also never occurred to me that it’s possible to conduct hot testing too.

  6. Mohamed Hussain says:

    Hi sir
    Is it every phones or small phones
    Also I need more information I want to learn

  7. Joseph Oluwayinka says:

    thank you for this pathform but can There be Vivid picture of the components of smart Phone ?

  8. Jak says:

    sir, my phone is not connecting to computer. even after replacing usb port. When connected to pc nothing shows up.

  9. athul says:

    hi
    my phone is showing battery over temperature error ,can you please suggest any way to solve the issue.

  10. Ajay says:

    Sir meri pass ak Samsung ka Mobile hay us may cold testing par jo value aani chahiye usesay bohot kam aa rahi he 160 or ulta laganeper value aake chale jarahe he iska solution kya hay patao plz

  11. Ceena says:

    hello sir ..
    what does “sense” mean in battery connector tip ? is the sense mean negative terminal of battery , bsi or temp tip ?

    you mentioned in cold testing “Battery Connector Tip (Sense): above .800 ” .
    my question is what does this “sense” mean ? could you please explain !!

  12. opeyemi says:

    sir, pls can you tell me how to read faulty capacitor in the board when battery connector is reading to each other when digital meter is on continuity and the phone is damaging battery

  13. albert says:

    sir you are great …it is my first time on your site and all info here is great…I think i will make a donation..give me details please …

  14. josep says:

    Thank you very much for your good knowledge;please keep it up.

  15. Pawan Dwivedi says:

    This is very important and helpful.
    I’m satisfied . And want to say you thanks and very well.

  16. RIYAZUL SIDDIQUI says:

    Dear sir,
    just tell me what is display signal pins and what is display supply pins in cold test and hot test methods. please give me this information

  17. Aina Oluwatade says:

    Thank you for your time. Please, how can I identify the ground of a pcb to test for faults on a phone? Thank you.

  18. Achyuth says:

    Dear sir,
    just tell me what is display signal pins and what is display supply pins in cold test and hot test methods. please give me this information

  19. Sadiq says:

    Sir how to test nokia mobil ringer points in pcb

  20. KANNAN says:

    Sir how to resolved half short mobile

  21. Siju says:

    Sir, my micromax doodle a111 recently run out of charge while on wifi, but when i restarted by charging the battery it struck on boot logo, and even can’t be go to safe mode which i successfully tried earlier times, please help

  22. Zake says:

    Hi sir,
    I have a question i have mmx canvas knight 2 which is not turning on and doesn’t shows the charging logo when i charge and even the red blinker above is not blinking i used a custom rom and it was working good but after i updated the rom version it went to recovery mode and then suddenly it shutted down

  23. Please can u explain the different testpoints and how to use them?

  24. Thank you sir! Please i have a major problem with one viwa T3 the vbat has automatically changed to ground when checked with a multimeter while the negative side of the battery connector will not beep if Checked with a multilmetre but if you put your test probe on the vbat and ground line it will beep please help me how do i go about it i am confused. Thank you for your time understanding i await your swift response.

    • You have to check the Tracks of viwa T3 Properly. Now a Days the Circuit are changing in different Phone Models but the Basic Rule of Electricity is Same.

      • Thank you sir! I will contact you if i have further questions. May our Goog God continue to bless and strengthen you for the knowledge you are impacting on us.

  25. Mohammad says:

    hello sir
    what does mean battery connector tip (sense) means?
    thanks for making website to give us free knowledge.

  26. Please sir! I tried practicing everything but i am getting different values how do i go about it? Or the multi-metre are they not the same?

  27. Lawrence says:

    this site greatly helpful. thanks Santosh Das

  28. how do you determine the “ground” on a pcb? thanks

  29. sumit ojha says:

    awesome technical knowledge …thank you :)…

  30. pratik s says:

    thanks a lot…

  31. silviu says:

    ok this i know but when is damage a cpu how measure then ???

  32. vikarmajeet says:

    I get many knowledge from your post. very thanks.If want to give anything I want many type of cell layout diagram with label.

  33. deep jaan says:

    this is the superb and exellent effort by sh.santosh das g!!!
    which is incomparable ……

  34. Mavin says:

    Please how can i get all this information on cd.help cos i’m a mobile phone technician who wants to improve my knowledge.what about software and flashing of fones.

  1. August 8, 2019

    […] Mobile Phone Repairing Testing Methods […]

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