The following statements describe either the cold testing or hot testing methods used for diagnosing mobile phone problems. Write the correct diagnosis method against the statement that best describes it. Description of diagnosis method Name of Diagnosis method 1.
Checks the value of resistance using a multimeter to diagnose a problem 2. Checks the voltage of damaged part by giving power to the mobile phone using a batter of DC power. The phone is not powered during testing 4. Fault is found by powering the mobile phone with a battery Compare your answer with what you read in the following section. You now know how to diagnose a fault in a mobile phone using the hot and cold testing method.
In the next section we shall learn about the common mobile phone faults. A fault is a defect a failure in a circuit or an electronic device. What causes faults or failures in mobile phones? Solutions to Battery charging faults 1.
Change the charger and check. The voltage must be between 5 and 7 Volts. Clean, resold or change the charger Connector. If the problem is not solved then change the battery and check again 5. Check the voltage of the battery connector using a Multimeter. The voltage should be between 1. If there is no voltage in the connector check the track of the charging section. Refer to the diagram of the particular model of the mobile phone. If the problem still persists, check the fuse, coil and regulator one by one and change the faulty part.
If the problem is still not solved then heat or change the charging IC. Finally heat, re-ball or change the Power IC. Check the battery connector and charger plug to see if there is any problem. Check if there is any dust or corrosion in the connector or any broken pin. Clean the points using IPA or cleaning swabs.
Check the Interface Connector to see if there is any dust. If there is dust clean or replace the interface connector. If the battery problem is not solved then upgrade the software or operating system to latest version 5. Check for any short circuit. If there is serious problem at the board level then it is better to replace the whole Logic Board of the Mobile Cell Phone. Solutions to Network fault 1. Manually search for the network. Repair or replace it.
If the network resumes after manual search but the home network cannot be selected, then there is a problem with the PFO. Repair or change the PFO. If the Network gets disconnected during phone calls then you should repair or change the Network IC. Clean the antenna tips and point. If the network problem persists, heat or change the 26MHz Crystal Oscillator.
If the problem is still not solved then heat or change the Antenna Switch. You can also jumper if the Antenna Switch is not available.
Heat, re-ball or change the Network IC. Heat, re-ball or change the Power IC. Heat, re-ball or change the CPU. Take Note: If the problem is not solved by hardware interventions, then reload the PM File in the mobile phone using the software box. Check the SIM Card. Alternatively, try to insert another SIM card inside the mobile phone that has the network problem. If the problem is caused by the SIM card, then you should change or replace it. If the problem is still not resolved then upgrade the operating system to the latest version.
If the problem is not solved then you may have to change the mobile phone. Mobile Phone Overheating A mobile phone may overheat either inside or on the body. To solve this problem you should proceed as follows: 1. Check if the mobile phone overheats when a particular application is running or if the overheating happens all the time. Upgrade the mobile phone software operating system to the latest version.
This may solve the overheating problem. Close all the applications and try to run 1 application at a time 4. If overheating persists, then there is some internal hardware problem. Earpiece or Ear Speaker Problem The Earpiece or speaker is the electronic component or part that helps us to listen to sound during a phone call.
See Figure 27 for a picture of an ear speaker. How to Solve Earpiece or Speaker Fault 1. Check the speaker volume during a phone call. If speaker volume is fine, then check the earpiece by keeping the multimeter in buzzer mode.
If the problem is not solved then check the Circuit Track of the earpiece section. Do jumper wherever required. If the problem is still not solved then heat, reball or change the CPU. Take Note: If the sound is low or not clear during a phone call, then you should change the speaker. Ringer Problem A Ringer is any type of electronic component that rings or plays a loud sound.
It is also called the I. F Speaker, buzzer, melody, etc. Figure 28 shows a picture of a ringer. Check the ringer settings in the mobile phone. Check Ringer volume and silent mode. If the problem is not solved then open the mobile phone and clean the ringer point and ringer connector.
If the problem is not solved then check the ringer by keeping the multimeter in buzzer mode. If the problem is not solved then check the track of ringer section.
If the problem is not solved then check the Ringer IC. Heat or change the IC. Vibration Problem The vibrator is an electronic device that generates vibrations. How to solve Mobile Vibrator faults 1. Check the Vibrator settings in the mobile phone. If the problem is not solved then open the mobile cell phone and clean the vibrator tips and connector. If the problem is not solved then check the vibrator with the multimeter in Buzzer Mode. If the problem is not solved then check the track of the vibrator section.
Microphone Problem The Microphone is an electronic component that helps to transmit sound during phone call. How to Solve Microphone Fault 1. Check the Microphone settings. Figure Jumper Setting For Microphone 2. If all the settings are normal, then check and clean the Microphone tips and connector.
If the problem is not solved then check the Microphone with the multimeter in Buzzer Mode. If the value is not in between that range, then change the Microphone. Note that only one side will give a value. If the problem is not solved then check the track of the Microphone section. Do Jumper wherever required. If the problem is not solved then heat or change the Microphone IC. It is controlled by the CPU.
Clean the display tips and display connector. Resold the display connector 3. Change the display 4. Check the display Track.
Resold or change the display IC. Heat, reball or change the CPU. Change the track to solve the problem. Figure 36 shows a diagram of series and parallel connections. Check the light settings. If the settings are normal then resold all the LED. If the problem is not solved then change the display or the screen.
Next check all the LEDs with the multimeter on Buzzer mode. If the LED is good then it will glow. If the LED is faulty then it will not glow.
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