Mobile components testing & checking.

                                

                                    Mobile phones have many small SMD (Surface Mounted Devices) components fixed on PCB (Printed Circuit Board) or on mobile Casing. All components have different work to do. So their way of testing is also different. Let’s we discuss how to test different component’s of mobile. Here are some components and their testing methods.

                                1-Micro phone

                         Micro phone is such a device which sends our voice to others...

    

                                Type of mics

There are 4 types of mic.

1- Pasted mic

2- Universal mic

3- spring mic

4- strip mic

      Testing a micro phone

Set the multimeter's veriable on X100 range and put the meter leads on both side of mic points. Note the reading. Now change the lead's direction and note the reading again.

Multimeter will show different reading on both sides. That's mean the mic is OK.

                        2-Earpiece

Ear piece is such a component which helps us to hear the voice coming from the other mobile...

                                          Testing

Set the multimeter's variable on X100 range and put the meter leads on both side of mic points.

If multimeter shows continuousy that's mean the earpiece is OK.

             3-Loudspeaker

Loudspeaker is such a component which gives a loud sound to make us alert

While the incoming call.

                                          Testing

Set the multimeter's variable on X100 range and put the meter leads on both sides of loudspeaker.

If multimeter shows continuousy that's mean the loudspeaker is OK.

           

                               4-Coils

Coils is a such component which filter current. It found in

Every section of mobile. It is mostly found in light section.

                                          Testing

Set the multimeter's veriable on X100 range and put the meter leads on both sides of loudspeaker.

If multimeter shows continuousy that's mean the coils is OK.

               5-Capacitors

Capacitors is such a component which store's voltages

And give it when the voltages become low.

There are many types of capacitors but we will discuss only two types.

   1) Polar capacitor

        It's such a component which has (+) and (-) side.

  

2) Non polar capacitor

     Non polar capacitor don’t have (+) and (-) sides. So it doesn’t matter which side you are placing. 

                    

                          6-LED (Light Emitting Diode)

LEDS are such components which glow and give light to see mobile screen and key pad buttons.

                                           Testing

Set multimeter variable on X1K or on Buzzer. Place one knob of multimeter on (+) side of LED and the second on the  (-) side of LED. If LED glows It’s ok otherwise it is burn out.