Sony KDL-32BX320 / KDL-32BX321 / KDL-32BX420 / KDL-32BX421 / KDL-40BX420 / KDL-40BX421 / KDL-46BX420 / KDL-46BX421 Service Manual ▷ View online
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 16
SECTION 2 - SOFTWARE REQUIREMENTS
EXAMPLES OF SOFTWARE CORRECTABLE
SYMPTOMS
Always check the Sony Authorized Servicer Portal at
www.sony.
com/asp
site for any known and/or listed issues that are software
related. Most symptoms that are correctable by software updates
involve communications issues with other devices or minor glitches
in the operation of a specific function. Below is a list of some of the
symptoms that may be corrected with a software update:
• Fluctuations in picture brightness
• Intermittent picture freezing or noise
• Problems with certain inputs (especially HDMI)
• Intermittent or distorted audio
• Erratic remote control operation
• Unit turns on and off by itself
• Loss of color
• Internet connectivity
• Certain features not working correctly
(photo or video file viewing)
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 17
OVERVIEW
The primary circuits contained in this chassis consists of a main circuit board (designated as the A board), power supply board (G13 for the 32”,
G14 for the 40”, and G3 for the 46”), Timing Control (TCON), and the LCD panel assembly. The remaining boards contain switches and LED’s.
NOTE: For connector part number information, refer to
NOTE: For connector part number information, refer to
Connectors on page 50
. For Wire Dressing information, refer to
Wire Dressing on page 54
.
G13
SWITCH UNIT
H
A
FIGURE 3-1. CIRCUIT BOARD LOCATION FOR KDL-32BX320/32BX321/32BX420/32BX421 ONLY
SECTION 3 - CHASSIS OVERVIEW
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 18
SECTION 3 - CHASSIS OVERVIEW
G14 (40” MODELS ONLY)
G3 (46” MODELS ONLY)
SWITCH UNIT
H
A
FIGURE 3-2. CIRCUIT BOARD LOCATION FOR KDL-40BX420/40BX421/46BX420/46BX421 ONLY
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 19
SECTION 3 - CHASSIS OVERVIEW
OVERALL CIRCUIT DESCRIPTION
Figure 3-3. Block Diagram on page 21
provides an overview of
the AZ2-UK chassis. Below is a description of the components and
their functions.
A BOARD
Common to all models utilizing the AZ2-UK chassis, the A board
contains most of the video processing circuitry along with all audio
processing. Control of the television is accomplished via a CPU
embedded within the MT5388 processor. Below is a list of the key
components located on the A board.
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).
MT5388 PROCESSOR
IC U3 performs the majority of the necessary audio and video
processing on the A board.
Analog Video Input Switch: All analog video sources are selected
Analog Video Input Switch: All analog video sources are selected
and A/D converted and scaled (if necessary) to 1280 X 720p 60HZ
resolution.
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 1280 X 720p 60HZ are scaled to
this resolution. Digital audio content is output to the class D amplifier
for processing and amplification.
Audio Processing: Analog audio sources are selected and A/D
Audio Processing: Analog audio sources are selected and A/D
converted directly by U3. The audio information is then processed
digitally. Digital audio from the tuner and HDMI sources is also input
and processed. Class D amplifier U8 provides the drive for the
speakers.
HDMI Input and Switching: The customer can select the HDMI1 or
HDMI Input and Switching: The customer can select the HDMI1 or
HDMI2 input. Each HDMI input contains a dedicated EDI NVM (not
shown) to provide display information data to any device connected
via the HDMI inputs.
CPU: The CPU internal to the MT5388 processor controls all aspects
CPU: The CPU internal to the MT5388 processor controls all aspects
of the television functions. Input from the user along with monitoring
of critical circuits is also performed by this CPU.
LVDS Transmitter: Integrated into U3 is a Low Voltage Differential
LVDS Transmitter: Integrated into U3 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.
POWER SUPPLY
There are 3 different power supply boards used in the models in this
manual. The type of board depends on the size of LCD panel. They
are:
G13 for the 32” models
G14 for the 40” models
G3 for the 46’ models
There are 2 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power
Standby Supply: Continuously operational as long as AC power
is applied, the standby supply generates 3.3VDC for the circuits
requiring power while the unit is turned off. An unregulated 15-volt
line is present to provide power to the main relay, PFC and main
power supply at turn-on.
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