What Are The Parts Inside A Cell Phone?

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There are two types of parts in all cell phones

  • External parts
  • Internal parts

External Parts

The external parts consist of snap on covers (casing) which can be detached and replaced by hand with the help of opening tools.

Internal parts

  1. PCB: The green or blue coloured board inside a cell phone is called the PCB (Printed Circuit Board). It is also called motherboard. It is the most important part in a cell phone. All the ICs which perform various functions are fixed on this circuit board. All the parts are attached to this board. It is what an engine is to a car.
  2. Battery: It supplies power to the cell phone. In most phones the battery is easily removable after removing the back cover. In others, you will need to dismantle the entire handset to remove it. The output voltage of a cell phone battery is either 3.7V DC or 3.8V DC.
  3. Mic: It is also called microphone and mouth piece. It converts voice into electrical signal. Its function is to send our voice to the called person. It will always be at the buttom inside a cell phone.
  4. Speaker: It is also called earpiece and receiver. It converts electrical signal into sound signal. Its function is exactly opposite of mic i.e is to listen to the voice of the called person. It will always be at the top inside a cell phone.
  5. Ringer: A ringer is also called a buzzer or loud speaker. It is a speaker with which we hear the ringtones and music and all the sounds which we hear louder.
  6. Vibrator: A vibrator is also called vibration motor and vibra motor. It is a DC motor which creates vibration when it rotates. The vibration in the handset when we receive a call is due to this part.
  7. Keypad: It works as an on-off switch. When we press the button. its two connectors contact with each other and the button functions. Keypads are outdated now, but still we need to know about it!
  8. Antenna: Its function is to receive and transmit the signals. Now all models have antennas that are inbuilt and hence not visible from outside. In old phones, antennas were external and hence were visible.
  9. Display: The screen of the phone is also technically called as display. It is liquid crystal based and so it is known as LCD (Liquid Crystal Display).
  10. Touch: It is a transparent part, above the LCD which allows the touch function to work. In most models now, the LCD and touch are fused together into one part.
  11. Flex: Flex is a brownish golden coloured cable which is used for connecting parts. Its not used in all cell phones. It is used for connecting either LCD, touch or camera to the PCB.
  12. Battery Connector: It connects the battery to the PCB of the mobile phone. It is the part that transfers the voltage from the battery to the PCB.
  13. SIM Connector: It connects the SIM card to the PCB of the cell phone.
  14. Charging Connector: It is a socket in which an external charger is plugged in to charge the battery of the mobile phone. It transfers the voltage from the charger to the PCB. It is also called charging port.
  15. Earphone Connector: We insert the earphone (headset) into this part.

There are many more connectors on the PCB like LCD connector, touch connector, camera connector, etc.

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