Sony KDL-46HX729 / KDL-55HX729 Service Manual ▷ View online
KDL-46HX729/55HX729 23
SECTION 3 - CHASSIS OVERVIEW
SWITCH
UNIT
HLR2
HEM2
HMS3
TCON
G6
G7
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.
RU
FIGURE 3-2. BOARD LAYOUT FOR KDL-55HX729 ONLY
KDL-46HX729/55HX729 24
SECTION 3 - CHASSIS OVERVIEW
OVERALL CIRCUIT DESCRIPTION
“Figure 3-3. Overall Block Diagram” on page 27
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 over-temperature conditions on the
Main Board, LCD Panel, or ambient room temperature and sends
the shutdown signal to the processor.
KDL-46HX729/55HX729 25
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:
● G5 (46”)
● G6 (55”)
● G7 (55”)
Note: The G7 Board is used exclusively in the 55” models
and is a converter circuit dedicated to providing B+ for
the LD (LED Drive) board to control the groups of LED
backlighting.
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: The converter circuit residing on the G5 Board generates
Converter: The converter circuit residing on the G5 Board generates
the B+ for the local dimming (LD board) circuits to control the
individual backlight LED groups. The G6 Board (used on the 55”
model) does not contain an integrated converter. It supplies PFC
395VDC to the G7 board where a dedicated converter generates the
B+ for the LD Board.
POWER SUPPLY FOR BACKLIGHT SYSTEM
Power for the LED backlights is provided via the G5 (46”). The 55”
models utilize a separate converter circuit G7 due to the increased
current requirements of the larger panel.
3D IR EMITTER BOARD
Designated as the HEM2 Board, this board is the internal 3D IR
Emitter to synchronize the 3D shutter glasses (3D Active Glasses
required, sold separately).
SWITCH UNIT
This board contains the power, channel, and volume up/down and
menu buttons.
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.
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.
KDL-46HX729/55HX729 26
SECTION 3 - CHASSIS OVERVIEW
LCD PANEL ASSEMBLY
The LCD Panel Assembly includes the LCD Panel, TCON Board,
and LED Backlight system.
NOTE: The LD Board is not always included with the LCD Panel
NOTE: The LD Board is not always included with the LCD Panel
and is usually not available as a replacement part. Check with the
LCD Panel manual for the most update information regarding this
information.
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. LED Backlighting Components (varies)
3. TCON Board
4. LD Board (for some models)
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.)
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