Philips 32PF9968/10 Service Manual page 153

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Circuit Descriptions, Abbreviation List, and IC Data Sheets
Configuration
Flash memory
9.8 Ambient Light
In this chassis, LED AmbiLight units are introduced as the
successor of CCFL AmbiLight units. The system type that is
used is called "UPEC".
The units are completely aligned in factory and are a "Black
Box" for Service. When defective, they must be replaced
completely. Refer to the Spare Parts List for the correct order
number.
The AmbiLight units for the 42" and 47" sets in this chassis
come with 6 LED's per unit.
The AmbiLight units are addressed by I
all lamp units is "6A". To address each unit separately,
selection lines are needed to distinguish between the boards.
Control is done by the SSB. Refer to figure "Ambient Light block
diagram" for details.
Resonator 60MHz
From
PNX5050
CMOS input :Vsync
LCD-Power -ON
I2C SSB
Figure 9-23 PACIFIC 3 control (diagram B06C)
2 2
C. The I C-address for
Q523.1U LA
RESET from PNX85xx
Second AmbiLight Unit
Sel = low/high
I 2 C + supply + 1 selection line
7pin
I 2 C + 2 selection lines
SUPPLY
TV520 SSB
(= I 2 C AmbiLightmaster)
Figure 9-24 Ambient Light block diagram
To address a specific unit, the selection line has to be "low".
In case of 2-sided AmbiLight, 6 data bytes are used to address
the units, 3 bytes for each lamp unit. They are driven by Pulse
Width Modulation (PWM). Refer to figure "Lamp unit
addressing" for details.
9. EN 153
Vsync to Scanning
Back Light D isplay
To dimming circuit
H_16770_138.eps
130707
First AmbiLight Unit
Sel = low/low
7pin
Supply
4pin
5pin
H_16770_139.eps
130707