Sony KDL-46HX820 / KDL-55HX820 (serv.man2) Service Manual ▷ View online
KDL-46HX820/55HX820 23
OVERVIEW
The primary circuits contained in the AZ2-F chassis consists of a Main Board (designated as the BATL Board), Power Supply Board (designated
as the G5 for the 46” models, G6 for the 55” models). The G7 (used only in the 55” models) is a converter circuit dedicated to providing power
for the LED backlight control circuits. The 46” model integrates the inverter on to the G5 Power Supply Board. The remaining circuits are the
3D IR Emitter (HEM2 Board), the Wireless LAN Card, the Switch Unit, the IR Board (HLT2 Board), a Camera Module, and the LCD Panel
Assembly which includes the TCON Board.
NOTE: For connector part number information, refer to
NOTE: For connector part number information, refer to
“Connectors” on page 54
. For Wire Dressing information, refer to
“Wire Dressing” on
page 56
.
SWITCH
UNIT
CAMERA MODULE
HEM2
HLT2
TCON
G5
BATL
WIRELESS
LAN CARD
FIGURE 3-1. BOARD LAYOUT FOR KDL-46HX820 ONLY
SECTION 3 - CHASSIS OVERVIEW
KDL-46HX820/55HX820 24
SECTION 3 - CHASSIS OVERVIEW
SWITCH
UNIT
CAMERA MODULE
HEM2
TCON
G7
G6
BATL
WIRELESS
LAN CARD
HLT2
FIGURE 3-2. BOARD LAYOUT FOR KDL-55HX820 ONLY
KDL-46HX820/55HX820 25
SECTION 3 - CHASSIS OVERVIEW
OVERALL CIRCUIT DESCRIPTION
“Figure 3-3. Overall Block Diagram” on page 28
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 BATL
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-46HX820/55HX820 26
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:
● 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 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
Designated as the HEM2 Board, this board is the internal 3D IR
Emitter to synchronize the 3D shutter glasses.
WIRELESS LAN CARD
The wireless transmit/receive circuits are located on this board to
communicate with a wireless network.
SWITCH UNIT
This board contains the power, channel, and volume up/down and
menu buttons.
CAMERA MODULE
A USB camera is located on the front bezel below the Sony logo.
Special software is located inside IC9000 to use the camera for
power and picture control management. Face recognition software
can determine whether someone is viewing the television. The
number of people, distance from the TV, location from center, and
whether the person(s) are looking at the television provides data to
control the picture brightness and contrast. A lack of face recognition
(no one viewing the television) can also be used to turn off the
backlights, and, eventually turn the TV off for power savings.
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