How to Check Parts of a Mobile Phone for Fault

How to Check Parts of a Mobile Phone for Fault

While repairing the mobile phone, you should often check the parts like Speaker, Ringer, Vibration, Coil, Boost Coin, On / Off Switch, Antenna Switch, Rx Filter, PFO, BSI, Network IC, VCO, Audio IC, Power Will be required. IC, RTC, Charging IC, CPU, R22, Microphone Interface, Bluetooth IC, Flash IC, RAM, Logic IC, UEm etc.

In most cases, only the card level parts of the mobile cell phone are checked for errors and are repaired or replaced with a new location. Mobile cell phone card parts parts include ringer, speaker, microphone, compressor, LED, charging connector, headphone connector, data cable connector, battery, battery connector, SIM card, SIM card connector, memory card, memory card connector, camera, camera Connector, keypad button, keypad connector, on / off switch, display, display connector, internal antenna and PDA.

Small parts of the chip level of a mobile phone, which include small electronics components such as capacitors, resistant, diode, coil, boost coils, couplers, regulators, transistors, are rarely tested for fault or not. If there is a mistake in the track of the mobile phone PCB, then it is sorted or solved.

There are essential mobile phone tools and tools to check for mobile phone parts for Folt using a multimeter

How to check the parts of mobile phones for defects

Ringer: 

To check if the mobile phone's ringer is faulty or damaged, multimeter for mobile phone repairs. Keep the multimeter in buzzer mode and check the ringer. The value must be between 8 to 10 oh. If the price is between this range then the ringer is good and the replacement is not required. If the value on the multimeter is 4-5 or 12-14 then change the ringer.

Vibrator or motor:

Keep the multimeter in buffer mode and check the vibration, the value should be 8 to 16 ohm. If the value is between 8-16h, then the vibration is good. Otherwise, change it. 

Speaker or Earpiece:

Check speaker/earpiece with a multimeter on the buzzer mode. Price should be in the range of 25 to 35 Ohm. If the price is in this category then the speaker/earpiece is fine and there is no need to change it. Otherwise, change speaker/earpiece.

Microphone or mic: 

Put multimeter in buzzer mode and check the microphone. Reading the value on the multimeter should be in the range of 600 to 1800 Ohm. The multimeter will also have a beep or buzz sound. Note: Please note that only one side of the microphone will show the price. If we check the multimeter's red and dark check/test leads and check the microphone then there will be no value.

Coil:

Check it with a multimeter on the buzzer mode. If it is good then multimeter will give beep or buzz sound. If there is no sound then the coil is faulty. Replace it with a new one.

Resistant or Resistance:

Check it with a multimeter on buzzer mode. If this is good, the multimeter will give beep or buzz sound. If there is no sound then the resistant is faulty. Replace it with a new one.

Capacitor: 

Check it with a multimeter on the buzzer mode. If it is good then the multimeter will not give a beep or buzz sound. If a sound is a capacitor is faulty. Replace it with a new one.

Diode: 

Check it with a multimeter on buzzer mode. If it is good then the multimeter will not give a beep or buzz sound. If there is sound then the diode is faulty. Replace it with a new one.

LED: 

Keep multimeter in buzzer mode and check LED. If the LED is good then they will not shine otherwise.

Coil and Boosting Coil: 

Check continuity. If there is continuity then the coil or boost coil is good otherwise it is faulty.

Keypad: 

Place the multimeter in buffer mode and check the rows and columns or keypad. If the beep or buzz sound from the multimeter is the keypad, then it is defective otherwise it is faulty.

Battery connector: 

Keep multimeter on 20V DC and check it. The value must be 1.5 to 3.5 V DC.

Battery: 

Check voltage with a multimeter. Put a multimeter on 20V DC and check it. The value should be 3.7 V DC or above.

On / Off switch:

Check the voltage with a multimeter. Put a multimeter on 20V DC and check it. A value should be between 2.5 to 3.7 V DC.

Network IC:

Use Analog DC power supply to check network IC. Switch to DC power supply and call any number from your mobile phone. DC Empere's needle will start moving forward. This shows that the network IC is OK and there is no mistake.

Power IC and CPU: 

Adjust the voltage of DC power supply 4.2. Place the red test/test lead of DC power supply in the "+" of the mobile phone's battery connector and the black probe/test lead. If the DC ampere is greater than 6 then the power IC or the CPU is damaged. Switch between Power IC and CPU one by one.

• If there is no movement of ampere needle of power supply then the battery connector, on/off switch track, RTC or network crystal has been damaged. Heat these components using hot air blowers. If the problem is not resolved then check them one by one.

• If the ampere fluctuates down from needle 2 then there may be a problem in software or RTC (real time clock).

• If the ampere needle is fixed at a certain point then there is a problem with the flash ic.

• If there is a beep sound from DC power supply then the problem is less with "+" and "-" or mobile handset.