Samsung PS42S5HX/XEE, Service Manual

Page: 75 / 125

Operation Instruction & Installation
11-6 Samsung Electronics
11-2 New Features
11-2-1 Power Saving Mode (Applies to the "Settings" of the User Menu)
1. Objectives
- To enhance a sensible visual quality by maintaining an appropriate screen brightness according to the ambient brightness and
to reduce power consumption.
- To improve the power consumption efficiency when Power Saving Mode is selected.
2. Details
The CPU PW318 of the Video Board takes the current ambient brightness (in Lux units) stored in the Ambient Light Sensor of the
Power Assy., which is attached at the front of the PDP, at given intervals through SMBUS communication (identical to I2C) and
controls the PDP module to operate with the appropriate illuminance. The I2C bus is used to communicate with the PDP module,
and the communication method is the same as the existing communication method.
- Location of the Ambient Light Sensor
The sensor is attached to the Power Assy., which is on the front of the PDP. The location of the sensor on the Power Assy. is
displayed in the figure below. External light reaches the sensor through the guide of the Power Assy.
The screen brightness is adjusted according to the brightness measured by the Ambient Light Sensor, using the Multi APC
function (controls the number of sustain pulses according to the average signal levels) of the PDP panel, thus reducing power
consumption.
The Ambient Light Sensor IC
detects the amount of illumination.