Small Parts Of A mobile and their Functions

The PCB of a mobile cell phone has several small parts or electronic components. Whenlearning mobile repairing, it is important to learn and understand how to identity these small parts or electronic components and understand their function. Identification of these small parts on the PCB of a mobile phone is easy if you know and understand some of the basic rules. It is also important to understand what to do if any of these small components is faulty.

Most of these electronic components are SMD (Surface Mount Devices). They don’t have any leads like thru-hole electronic components.

Small Parts / Electronic Components of a Mobile Phone: Identification, Faults and Function:

Boost Coil: Its size is little bigger than coil. It is found in black colour and

Mobile Phone Coil

looks like a large button. Its function is to increase current. If this coil gets damaged then it has to be changed.

Coil: It is found in any section of a mobile phone. It is found in many shapes and sizes. Coils are found in 2 colours: (i) Black and white; and (ii) Blue and white. It has binding of copper coil inside. It filters and decreases Current and Voltage.

Capacitor: 3 types of capacitor are found in a mobile cell phone:

1. Non-Electrolytic Capacitor: It is found in any section of a mobile
   

   Mobile Cell Phone Capacitor
   phone. Its height is little more than chip resistance. It can be of gray, yellow or brown in color. It has no Positive (+) or Negative (-) side. It filters DC current.

2. Electrolytic Capacitor: It is found in any section of a mobile phone. Its size is larger than non-electrolytic capacitor. It is found in 2 colors – (i) Orange with brown strip: and (ii) Black with white strip. The side with the strip is Positive (+) and the other side is Negative (-). It filters and stores current.

3. Network Capacitor: It is found in any section of a mobile phone. It is made from 2 or more Non-Electrolytic Capacitors.

Coupler: This electronic component is found in the Network Section of a

Mobile Phone Coupler

mobile phone. It is of either black or white color and has 6 pins bent inside.

Function: It filters network.

Faults: If the coupler is faulty then there will be no network in the mobile phone.

Diode: Diodes are of 4 types:-

1. Rectifier Diode: It is found in black color and converts AC Current to DC Current. It passes current in one direction. It does not pass current in reverse direction.
   

   Mobile Phone Rectifier Diode

2. LED: It is found in white or light yellow color and emits light.
   

   Mobile Phone LED

3. Zener Diode: It is found in charging section. It filters and minimize current and passes forward. It acts as voltage regulator. Zener diode has fixed capacity like 4V, 6V, 8V etc.
   

   Mobile Phone Zener Diode

4. Photo Diode: It is used for Infrared. It captures Infrared Rays.
   

   Mobile Phone Photo Diode

Regulator: This electronic component is found in any section of a mobile phone. It is of black color and has 5 or 6 legs. It filters current and regulates voltage.

Mobile Phone Regulator

Resistance or Resistor: There are 2 types of resistance on the PCB of a

Mobile Phone Resistor

mobile phone:

1. Chip Resistance: It can be found in any section of a mobile phone. It is of black color. In some sets it is also found in blue and green colour. It is the smallest electronic components on the PCB of a mobile phone. It Decreases current and passes forward.

2. Network Resistance: It can be found in any section of a mobile phone. It is made from 2 or more Chip Resistance.

Transistor: This electronic component is found in any section of a mobile phone. It is of black color and it has 3 legs. It does the work of switching.

Mobile Cell Phone Transistor