Sony KDL-32EX729 / KDL-40EX729 / KDL-46EX729 Service Manual ▷ View online
KDL-32EX729/40EX729/46EX729 19
SECTION 3 - CHASSIS OVERVIEW
SWITCH
UNIT
HLR2
HEM2
HMS3
TCON
LD
G5
BATV
NOTE: The RU Board is NOT mounted on the LCD Panel. It is enclosed in the
Top R Bracket and Bottom R Bracket and is mounted on the Rear Cover.
NOTE: The LD Board is NOT included with the LCD Panel.
RU
FIGURE 3-3. BOARD LAYOUT FOR KDL-46EX729 ONLY
KDL-32EX729/40EX729/46EX729 20
SECTION 3 - CHASSIS OVERVIEW
OVERALL CIRCUIT DESCRIPTION
“Figure 3-4. Overall Block Diagram” on page 23
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
IC9000.
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: HDMI inputs are switched through
IC5500. Each HDMI input contains a common EDID NVM (internal to
IC5500) 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 TCON 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 temperature conditions on the
Main Board, LCD Panel, or ambient room temperature. The IC
sends temperature data to the microprocessor. The microprocessor
decides when to shut the unit down depending on temperature level.
KDL-32EX729/40EX729/46EX729 21
SECTION 3 - CHASSIS OVERVIEW
POWER SUPPLY BOARD
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:
● G10 Board (32”)
● G4 Board (40”)
● G5 Board (46”)
There are 3 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.
Converter: Generates the B+ for the local dimming (LED Drive
Converter: Generates the B+ for the local dimming (LED Drive
Board) circuits to control the backlighting level.
POWER SUPPLY FOR BACKLIGHT SYSTEM
Power for the LED backlights is provided for the LED Drive Board via
the G10 Board for the 32” models, G4 Board for the 40” models, and
the G5 Board for the 46” models.
3D IR EMITTER BOARD
Designated as the HEM2 Board, this board is the internal 3D IR
Emitter to synchronize the 3D Active Shutter Glasses.
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.
KDL-32EX729/40EX729/46EX729 22
SECTION 3 - CHASSIS OVERVIEW
LCD PANEL ASSEMBLY
The LCD Panel Assembly includes the LCD Panel, TCON Board,
and the LED Backlight system.
NOTE: The LED Driver (LD Board) is
NOTE: The LED Driver (LD Board) is
NOT included with the LCD
Panel.
The LCD Panel contains the actual liquid crystals, color filters, and
The LCD Panel contains the actual liquid crystals, color filters, and
polarizers. The liquid crystals are manipulated by the applied voltage
to pass a specific amount of light - from the backlight- depending on
the level of voltage applied.
The TCON performs all the control, timing, charge, and discharge
The TCON performs all the control, timing, charge, and discharge
functions driving the operation of the LCD Panel.
A new LCD Panel assembly from parts will include the following
A new LCD Panel assembly from parts will include the following
items.
1. LCD Panel
2. TCON Board
3. LED Drive Board (Backlighting system - not always
included with the panel)
TCON BOARD
The TCON Board communicates between the LCD Panel and the
microprocessor on the Main Board. (NOTE: The TCON Board is not
available as a replacement part for all models.)
LED DRIVER (LD BOARD)
Designated as the LD Board the LED Driver is controlled by the
TCON/HFR Board to perform overall backlight power-on, backlight
level, and local dimming functions. The negative voltage rail is pulse
width modulated to control the on time of the LED backlights. LED
backlight brightness is controlled in 4 separate groups (quadrants).
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