Sony KDL-32BX355 / KDL-40BX455 / KDL-46BX455 Service Manual ▷ View online
KDL-32BX355/40BX455/46BX455 5
SECTION 1 - FEATURES AND OVERVIEW
CPU: The CPU internal to the MT5366 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 the MT5366 is a Low Voltage Differential
LVDS Transmitter: Integrated into the MT5366 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 BOARD
The Power Supply Board used in these models is the:
●
G Board
There are 2 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power is applied,
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.
Main Supply: Once the power supply receives a power-on command from
Main Supply: Once the power supply receives a power-on command from
the CPU on the A board, the main switching supply is turned on to provide
a regulated 12V source, a dedicated un-regulated 15V for the audio circuits
and an unregulated 24V source for the inverter circuit.
IR BOARD
Designated as the H Board, the IR Board contains the power, standby and
timer LED’s that is located on this board along with the IR Remote Receiver
and light level sensor.
SWITCH UNIT
This board contains the power, channel and volume up/down, and menu
buttons.
OVERALL CIRCUIT DESCRIPTION
The
“Block Diagram” on page 10
provides an overview of the AZ3TK
chassis. The following are descriptions of the boards and their functions.
MAIN BOARD
Common to all models utilizing the AZ3TK chassis, the Main 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
MT5366 processor. Below is a list of the key components located on the
Main Board.
TUNER
The tuner is a combination NTSC/PAL unit. It can receive traditional analog
NTSC signals via cable or terrestrial along with digital SBTVD-T.
MT5366 PROCESSOR
This IC performs the majority of the necessary audio and video processing
on the Main Board.
Analog Video Input Switch: All analog video sources are selected and
Analog Video Input Switch: All analog video sources are selected and
A/D converted and scaled (if necessary) to 1920 X 1080p 60HZ resolution.
Digital Audio and Video Decoder: The MPEG2 and Digital Dolby audio
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.
Audio Processing: Analog audio sources are selected and A/D converted
Audio Processing: Analog audio sources are selected and A/D converted
directly by the MT5366. The audio information is then processed digitally.
Digital audio from the tuner and HDMI sources is also input and processed.
Class D amplifier provides the drive for the speakers.
HDMI Input and Switching: The customer can select the HDMI1 or HDMI2
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.
KDL-32BX355/40BX455/46BX455 6
SECTION 1 - FEATURES AND OVERVIEW
LCD PANEL ASSEMBLY
The LCD Panel Assembly includes the LCD Panel, TCON Board and
Backlight system.
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 functions
The TCON performs all the control, timing, charge and discharge functions
driving the operation of the LCD Panel.
A new LCD Panel Assembly will include the following items:
A new LCD Panel Assembly will include the following items:
●
LCD Panel
●
TCON Board (Internal - not available as a replacement part)
●
Inverter MT Board
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
NOTE: The TCON Board is not available as a replacement part for all
models. To determine if the TCON Board is available as a replacement
part, refer to the LCD Panels Manual.
INVERTER MT BOARD
The Inverter receives the unregulated 24V from the Power Supply Board
and generates the required high voltage AC to power the backlight lamps. A
control line to turn on the Inverter (backlights on) is used in conjunction with
a dimmer control to vary the light level of the CCFL lamps.
KDL-32BX355/40BX455/46BX455 7
OVERVIEW
This chapter provides information regarding the Self Diagnosis feature in
our TVs.
UPDATING THE SOFTWARE
The Self Diagnosis function is designed to provide information regarding
the problem with the TV, however, there are several issues that may be
resolved by updating the TV software to the latest version. Always check for
any 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
●
TV turns on and off by itself
●
Loss of color
●
Internet connectivity (internet models only)
●
Certain features not working correctly
(photo or video file viewing)
SECTION 2 - TROUBLESHOOTING
Self Diagnosis
Supported model
SELF DIAGNOSIS FUNCTION
Critical voltages and circuit operations are monitored by the CPU on the
Main Board. If an error is detected the Self Diagnosis function in the TV will
force the TV to shut down by the CPU. The monitored circuit in which the
fault occurred will automatically cause the CPU to blink the Standby LED
in groups of repeating sequences. The number of times the Standby LED
blinks indicates the possible cause of the problem.
Not all of the available protect codes are used in every model. For example,
Not all of the available protect codes are used in every model. For example,
models that don’t have the local dimming feature do not use the 4X blink
error as this circuit is found in models that are backlit with fluorescent lamps.
The information in this section provides guidance in locating the possible
component causing the shutdown.
STANDBY LED BLINK COUNT
Standby LED
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
LED DISPLAY & BLINK COUNT
KDL-32BX355/40BX455/46BX455 8
SECTION 2 - TROUBLESHOOTING
VIEWING THE SELF CHECK DIAGNOSIS HISTORY
When an error is detected, the Self Check screen records the error that
occurred. This is helpful in confirming past occurrences of an error and for
determining if an error is intermittent when the customer is not sure what
is causing the television to shut down. If the screen displays a “0”, no error
has occurred.
You must got into
You must got into
Service Mode to access the Self Check menu.
1. TV must be in Standby mode.
2. Press the following buttons on the
2. Press the following buttons on the
Remote Commander within a
second of each other:
DISPLAY
Channel 5
Volume +
POWER
3. To access the Self diagnosis history page, press until
Self
diagnosis history is highlighted.
Sound Adjustment
>>
Wide Band Tuning
>>
Range Scan…
>>
Self diagnosis history
>>
Status Information…
>>
LVDS Spectrum(%0)
<[
50
]>
Panel Selection
<[
T315XW04_V3
]>
SERIAL NUMBER EDIT
8500001
MODEL NAME EDIT
KDL-32BX355
[</>]Set [Menu] Exit
Service Mode
4. Then press to view
Self Check screen.
Back
<<
002
MAIN_ POWER
001
003
AUDIO_PROT
000
003
DC_ALERT1
000
0
0
0
R
E
C
N
A
L
A
B
4
0
0
0
0
0
R
R
E
_
N
O
C
T
5
0
0
005
005
PANEL_POWE
000
0
0
0
E
T
I
L
K
C
A
B
6
0
0
0
0
0
R
R
E
_
P
M
E
T
7
0
0
00150
00075
00030
[Menu] Exit
SELF CHECK
Indicates
an error
has occurred
an error
has occurred
Indicates
no error
has occurred
no error
has occurred
SAMPLE SELF CHECK DIAGNOSIS PAGE
2X Blink - Main Power Error
A loss of REG12V from the power supply triggers this protect event. The
usual cause is a failure of the main switching supply. In some instances,
excessive loading on the secondary supply lines can cause the switching
regulator to stop, or fail again, if a replacement board is installed.
3X Blink- DC Regulator/Audio Error
The REG 5V and D3.3V source originating on the Main Board is monitored
for low-voltage conditions by the CPU. A failure causing a 3X shutdown
requires replacing the Main Board.
4X Blink – Balancer Error
NOT USED IN THIS MODEL SERIES.
5X Blink - TCON Error/Panel Error
The 5X blink protection mode indicates a communications error with the
timing control circuits (TCON Board) has occurred. If the TCON Board is
available for replacement, replace it, if not, replace the LCD Panel Assembly.
In rare cases a loose or defective LVDS cable could also be the cause.
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