Proximity Sensor

Introduction:

A proximity sensor is a device that able to detect the presence of any kind

of object near its radiation area. Proximity sensor emits an electromagnetic

radiation, when any object overlap onto its radiation area sensor gets a return

signal and start working. Earlier, IR-based proximity sensors were used in

mobile phone to detect the presence of a human ear. But now capacitive

proximity sensing technology replaced every IR sensor in the mobile phone

market.

Proximity Sensor situated at top level of PCB on the left side of Receiver.

IR Proximity Sensor

Proximity Sensor

Proximity Sensor

Function:

When you calling someone via your mobile Proximity Sensor reduce display
power consumption by turning off the LCD backlight and disable the touch
screen to avoid inadvertent touches by the cheek.

Measurement:

Call from your Proximity Sensor enable smart phone to someone. Now take

a flash light or torch light then turn on this light and directed to sensor. If LCD 

backlight is turn off then Proximity Sensor is good. Whereas If LCD backlight

is not turn off then Proximity Sensor is faulty.

Problem:

LCD backlight will not turn off when you calling someone.

Solution:

1.   Check Touch Panel is attached correctly to front part. If not then attach properly.

2. Change Proximity Sensor.

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