Sony KDL-32EX725 / KDL-40EX725 / KDL-55EX725 Service Manual ▷ View online
KDL-32EX725/40EX725/55EX725
15
OVERVIEW
The primary circuits contained in the AZ2-F chassis for the consists of a Main Board (designated as the BATV board), Power Supply Board
(designated as the G10A Board for the 32” models, G4B Board for the 40” models, and G6A Board and G8A Board for the 55” models), the Motion
Sensor (HMS3 Board), the IR Board (HLR2 Board), the Switch Unit, and the LCD Panel assembly.
NOTE: For connector part number information, refer to
NOTE: For connector part number information, refer to
“Connectors” on page 62
. For Wire Dressing information, refer to
“Wire Dressing” on page 65
.
SWITCH
UNIT
HLR2
HEM2
HMS3
TCON
LD
G10A
BATV
FIGURE 3-1. BOARD LAYOUT FOR KDL-32EX725
SECTION 3 - CHASSIS OVERVIEW
KDL-32EX725/40EX725/55EX725
16
SECTION 3 - CHASSIS OVERVIEW
SWITCH
UNIT
HLR2
HEM2
HMS3
TCON
LD
G4B
BATV
FIGURE 3-2. BOARD LAYOUT FOR KDL-40EX725
SWITCH
UNIT
HLR2
HEM2
HMS3
TCON
LD
G6A
G8A
BATV
FIGURE 3-3. BOARD LAYOUT FOR KDL-55EX725 ONLY
KDL-32EX725/40EX725/55EX725
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SECTION 3 - CHASSIS OVERVIEW
OVERALL CIRCUIT DESCRIPTION
“Figure 3-5. Overall Block Diagram” on page 20
provides an overview
of the AZ2-F chassis. The following are descriptions of the boards
and their functions.
MAIN BOARD
Common to all models the Main Board, designated as the BATV
Board, contains the TV control, video, and audio processing circuitry.
All these functions are accomplished using the X-Reality Processor.
TUNER
The tuner is a combination ATSC/NTSC unit. It can receive traditional
analog NTSC signals via cable or terrestrial along with ATSC digital
signals via terrestrial (8VSB) or cable (64 or 256 QAM).
X-REALITY PROCESSOR
IC9000 performs the majority of the necessary audio and video
processing on the main board.
TV Microprocessor: The CPU internal to the X-Reality processor
TV Microprocessor: The CPU internal to the X-Reality processor
controls all aspects of the television functions. Input from the user
along with monitoring of critical circuits is also performed by this
CPU.
Digital Audio and Video Decoder: The MPEG2 and Digital Dolby
Digital Audio and Video Decoder: The MPEG2 and Digital Dolby
audio streams are received from the tuner for decompression. All
video sources which are not native 1920 X 1080p 60HZ are scaled to
this resolution. Digital audio content is output to the class D amplifier
for processing and amplification.
HDMI Input and Switching: The customer can select the HDMI1,
HDMI2, HDMI3, HDMI4 input. Each HDMI input contains a common
EDI NVM (not shown) to provide display information data to any
device connected via the HDMI inputs.
LVDS Transmitter: Integrated into IC9000 is a Low Voltage
LVDS Transmitter: Integrated into IC9000 is a Low Voltage
Differential Signaling (LVDS) transmitter. This circuit converts the
8-bit parallel RGB video information into a set of high speed serial
lines for noise-free transmission to the T-CON circuits located
internally to the LCD panel.
Scan Converter: Signal processing circuit that performs resolution
Scan Converter: Signal processing circuit that performs resolution
conversion (aspect ratio) and interlaced to progressive scan (IP)
conversion
AUDIO AMPLIFIER
The audio amplifier (IC4601) amplifies the digital audio output of the
X-Reality processor and sends it to the speakers.
TEMPERATURE SENSOR
The temperature sensor detects over-temperature conditions on the
Main Board, LCD Panel, or ambient room temperature and sends
the shutdown signal to the processor.
KDL-32EX725/40EX725/55EX725
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SECTION 3 - CHASSIS OVERVIEW
POWER SUPPLY
There are different Power Supply Boards used in the models in this
manual. The type of board depends on the size of LCD panel. They
are:
● G10A-Board (32”)
● G4B-Board (40”)
● G6A-Board (55”)
Note:the G8A in the 55” models is the Power Supply Board
for the Panel LED backlight system.
There are 2 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power is
Standby Supply: Continuously operational as long as AC power is
applied, the standby supply generates 3.3V for the circuits requiring
power while the unit is turned off. An unregulated 19V line is present
to provide power to the main relay, PFC and main power supply at
turn-on.
Main Supply: Once the power supply receives a power-on command
Main Supply: Once the power supply receives a power-on command
from the CPU on the Main Board, the main switching supply is turned
on to provide a regulated 12V source and an regulated 24V source
for the LED power supply circuits.
POWER SUPPLY FOR BACKLIGHT
SYSTEM
The G8A-Board is the Power Supply Board for the Panel LED
backlighting system (including the LED Driver Board) for the 55”
model only. 390V, 19V, and 12V are applied to the board from the
G6A Board to develop the 24V. The 24V is applied to the LD Driver
board.
LD BOARD (LED DRIVER BOARD)
The LED Driver Board is controlled by the T-CON/HFR Board to
perform overall backlight power-on, backlight level, and local dimming
functions. This board takes the 24V from the Power Supply Board
(or G8A Board for the 55” models) and develops the negative and
positive voltages to directly drive the LEDs in the panel assembly.
3D IR EMITTER
Designated as the HEM2 Board, this board is the internal 3D IR
Emitter.
SWITCH UNIT
This board contains the power, channel, and volume up/down and
menu buttons.
MOTION SENSOR BOARD
Designated as the HMS3 Board, the Motion Sensor Board contains
the circuits for the Motion Sensor. The Motion Sensor detects when
there is movement in front of the TV. If there is no movement in
front of the TV after a predetermine amount of time the backlight is
turned off (audio present). After an extended period of time the TV is
completely turned off.
IR BOARD
Designated as the HLR2 Board, the IR Board contains the power,
standby, and timer LED’s are located on this board along with the IR
remote receiver and light level sensor.
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