There are times when you know that there is something wrong with your mobile, but you can’t quite figure out where. Do you know that majority of the defective parts can be identified using a multimeter and DC power supply? It is often the card level parts of a mobile cell phone such as speaker, microphone, vibrator, LED, ringer, charging connector, data cable connector, battery connector, headphone connector etc. that requires repair.
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Ringer: Switch to the buzzer mode in the multimeter and check the ringer. A perfectly functioning ringer displays their ohm value lies in between 8-10. If the value ranges from 4-5 or 12-14, it may need replacement.
Speaker or Earpiece: Examine the speaker / earpiece in buzzer mode. The operational value is in between 25 to 35 Ohms and may need replacement, if otherwise.
Microphone: Microphone testing also needs to be done in the buzzer mode of a multimeter. The typical range is in between 600 and 1800 Ohms and a beep sound is also produced along with it.
Coil, Resistors, Capacitors, Diodes: When the multimeter is connected to the aforementioned parts on Buzzer Mode, they produce a beep sound which signals that they are working correctly. Also check for continuity in boost coils.
Battery Connector: The multimeter should be connected to a 20V DC and checked that the value falls in between 1.5 to 3.5 V DC.
Battery: Connect the multimeter to a 20V DC and ensure that value on the same is 3.7 V DC or above.
ON / OFF Switch: Here also, the multimeter must be on 20V DC and confirmed that 2.5 to 3.7 V DC is displayed, otherwise a replacement is needed.
Network IC: The network IC can be tested using an analog DC power supply. Dial any number from your device after the power supply is on. If the needle starts moving, the network IC is working fine.
Power IC and CPU: Adjust the DC Power Supply to 4.2 V. Connect the Red Probe of the DC Power Supply to the “+”of the mobile phone’s battery connector and the Black Probe to “-“. If the DC Ampere is over 6V, then either the Power IC or CPU is to be repaired. The faulty component can be determined by replacing using the trial and error method. A stationary ampere needle usually denotes problem with the Battery connector, On / OFF Switch Track, RTC or Network Crystal.
You can always hand over the cumbersome process of repairing a mobile phone to a professional and experienced mobile phone service centre like Mr Phone in Dubai. We treat your mobiles with care and our excellent services ensure that they’ll be as good as new when you get it back.
