Sony KDL-22EX355 Installation guide

SERVICE / TRAINING MANUAL
LCD Digital Color TV
AZ3TK Chassis
Segment: P-2L
9-883-896-01
Self Diagnosis
Supported model
Version Date Subject
1.0 7/13/2012 Original Manual Release Date
ORIGINAL MANUAL ISSUE DATE: 7/2012
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:

SERVICE / TRAINING MANUAL
LCD Digital Color TV
AZ3TK Chassis
Segment: P-2L
9-883-896-01
Self Diagnosis
Supported model
KDL-40EX455

MODEL LIST
MODEL COMMANDER DESTINATION MODEL COMMANDER DESTINATION
9-883-896-01
KDL-22EX355 RM-YD081 BRAZIL
KDL-32EX355 RM-YD081 BRAZIL
KDL-40EX455 RM-YD081 BRAZIL

KDL-22EX355/32EX355/40EX455 i
TABLE OF CONTENTS
Cautions and Warnings...................................................................................ii
Section 1 - Features and Overview ................................................................1
Features ........................................................................................................1
Specications ................................................................................................1
Chassis Overview..........................................................................................3
Overall Circuit Description.............................................................................5
Main Board ...............................................................................................5
Power Supply Board .................................................................................5
IR Board....................................................................................................5
Connector Board.......................................................................................5
Switch Unit................................................................................................6
LCD Panel Assembly................................................................................6
Section 2 - Troubleshooting ...........................................................................7
Overview .......................................................................................................7
Updating the Software ..............................................................................7
Self Diagnosis Function.................................................................................7
Standby LED Blink Count .........................................................................7
Viewing the Self Check Diagnosis History................................................8
Triage Chart...................................................................................................9
Section 3 - Flow Charts and Diagrams ........................................................10
Block Diagram .............................................................................................10
No Power..................................................................................................... 11
Standby LED Blinking..................................................................................13
No Video......................................................................................................14
Section 4 - Disassembly/Part Number Information ....................................16
Table-Top Stand and Rear Cover Removal.................................................16
Main Board (A) and Power Supply Board (G22/G32/G40) Removal ..........17
KDL-22EX355 Only ................................................................................17
KDL-32EX355/40EX455 Only.................................................................18
LCD Panel Removal....................................................................................19
KDL-22EX355 Only ................................................................................19
KDL-32EX355/40EX455 Only.................................................................20
Reattaching the Bezel to the LCD Panel ................................................21
Cleaning the LCD Panel .........................................................................21
Connectors ..................................................................................................22
KDL-22EX355 Only ................................................................................22
KDL-32EX355 Only ................................................................................22
KDL-40EX355 Only ...............................................................................23
Screws.........................................................................................................23
Accessories and Packaging ........................................................................24
Optional Accessories...................................................................................24
Miscellaneous..............................................................................................24
Wire Dressing..............................................................................................25
Section 5 - Updates and Adjustments .........................................................26
Overview .....................................................................................................26
Software Updates for Customers ................................................................26
Software Updates for Servicers...................................................................26
Software Update Responsibility..............................................................27
Checking the Software Version...............................................................27
Examples of Software Correctable Symptoms .......................................27
Overview .....................................................................................................28
Updating the Software.................................................................................28
Accessing Service Adjustment Mode ..........................................................28
Completing Service Requirements When Replacing the Main Board .........29
Viewing the Status Information ...............................................................29
Selecting the Panel ID Code...................................................................30
Adding the Serial Number.......................................................................31
Adding the Model Name .........................................................................32

KDL-22EX355/32EX355/40EX455 ii
TABLE OF CONTENTS
Completing Service Requirements When Replacing the LCD Panel ..........33
Verifying the Panel ID Code....................................................................34
Resetting Panel Operation Time.............................................................35
Appendix A: Encryption Key Components ............................................... A-1

KDL-22EX355/32EX355/40EX455 iii
CAUTION
These servicing instructions are for use by qualied service personnel only.
To reduce the risk of electric shock, do not perform any servicing other than
that contained in the operating instructions unless you are qualied to do so.
WARNING!!
An isolation transformer should be used during any service to avoid possible
shock hazard, in case of live chassis.
!
SAFETY-RELATED COMPONENT WARNING!!
There are critical components used in LCD color TVs that are important for
safety. These components are identied with shading and
!
mark on the
schematic diagrams and the parts list. It is essential that these critical parts
be replaced only with the part number specied in the parts list to prevent
electric shock, re, or other hazard.
NOTE: Do not modify the original design without obtaining written permission
from the manufacturer or you will void the original parts and labor warranty.
ATTENTION
For safety reasons, component level repair of the Power Supply Boards
and/or the Inverter Boards is prohibited.
CAUTIONS AND WARNINGS

KDL-22EX355/32EX355/40EX455 iv
CAUTIONS AND WARNINGS
SETTING UP AND CARRYING THE TV
●Disconnect all cables when carrying the TV.
●Carry the TV with the adequate number of people; larger size TVs require two or more people.
●Correct hand placement while carrying the TV is very important for safety and to avoid damage.
ALL MODELS EXCEPT
22” MODELS
A
LL 22” MODELS
USE CAUTION WHEN HANDLING THE LCD PANEL
When repairing the LCD panel, be sure you are grounded by using a wrist band.
When installing the LCD panel on a wall, the LCD panel must be secured using the 4 mounting holes on the rear cover.
1. Do not press on the panel or frame edge to avoid the risk of electric shock.
2. Do not scratch or press on the panel with any sharp objects.
3. Do not leave the module in high temperatures or in areas of high humidity for an extended period of time.
4. Do not expose the LCD panel to direct sunlight.
5. Avoid contact with water. It may cause a short circuit within the module.
6. Disconnect the AC power when replacing the backlight or inverter circuit.
(High voltage occurs at the inverter circuit at 650Vrms.)
7. Always clean the LCD panel with a soft cloth material.
8. Use care when handling the wires or connectors of the inverter
circuit. Damaging the wires may cause a short.
9. Protect the panel from ESD to avoid damaging the electronic
circuit (C-MOS).
10. During the repair, DO NOT leave the Power On for more than
1 hour while the TV is face down on a cloth.

KDL-22EX355/32EX355/40EX455 v
CAUTIONS AND WARNINGS
CLEANING THE LCD PANEL
CAUTION: When cleaning the TV, be sure to unplug the power cord to avoid any chance of electric shock.
Clean the cabinet of the TV with a dry soft cloth.
Wipe the LCD screen gently with a soft cloth.
;Stubborn stains may be removed with a cloth slightly moistened with a solution of mild soap and warm water.
;If using a chemically pretreated cloth, please follow the instruction provided on the package.
;Never use strong solvents such as a thinner, alcohol or benzine for cleaning.
;Periodic vacuuming of the ventilation openings is recommended to ensure proper ventilation.
;Do Not use paper towels, any type of abrasive pad, rags, rubber or vinyl materials to clean the screen. Using these materials could easily scratch the
screen which may result in permanent damage.
;Do Not use any cleaning product containing alkaline/acid cleaner, scouring powder, or volatile solvent, such as alcohol, ammonia, benzine, thinner or
insecticide. Using any of these harsh cleaners may result in permanent damage to the screen.
;Do Not spray water or detergent directly onto the TV screen. If liquid drips into the bottom of the screen it may cause a failure.

KDL-22EX355/32EX355/40EX455 vi
CAUTIONS AND WARNINGS
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety
checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly soldered
connections. Check the entire board surface for solder splashes
and bridges.
2. Check the interboard wiring to ensure that no wires are pinched or
touching high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps, and
mounting hardware have been replaced. Be absolutely certain that
you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors,
that were installed during a previous repair. Point them out to the
customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend their
replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the antenna terminals, metal trim, metallized knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage
as described in “Leakage Test”.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and from all
exposed metal parts to any exposed metal part having a return to chassis,
must not exceed 0.5 mA (500 microamperes). Leakage current can be
measured by any one of three methods.
1. A commercial leakage tester.
Follow the manufacturers’ instructions provided with the tester.
2. A battery-operated AC milliammeter.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The limit indication is 0.75 V, so
analog meters must have an accurate low voltage scale. Nearly all
battery-operated digital multimeters that have a 2 VAC range are
suitable. (see Figure A)
To Exposed Metal
Parts on Set
0.15 µF
Earth Ground
AC
Voltmete
r
(0.75V)
Figure A. Use an AC voltmeter to check AC leakage.
HOW TO FIND A GOOD EARTH GROUND
The cover-plate retaining screw on most AC outlet boxes is at earth ground.
Verify the AC outlet box retaining screw ground by connecting a 60W to
100W incandescent (not a neon or uorescent lamp) between the hot side of
the receptacle and the retaining screw. Try both slots, if necessary, to locate
the hot side on the line; the lamp should light at normal brilliance if the screw
is at ground potential. (see Figure B)
Figure B. Checking for earth ground.
Trouble Light
AC Outlet Box

KDL-22EX355/32EX355/40EX455 1
FEATURES
The AZ3TK chassis is one of several designs for the 2012 model line of
Sony Bravia® LCD televisions. This manual covers the following models:
KDL-22EX355
KDL-32EX355
KDL-40EX455
The BRAVIA® Sync™ EX35x and EX45x series LED LCD HDTV
●Brilliant Full HD (1080p) picture quality
●Four HD inputs for a cable box, PS3™ and more 1
●Share your pictures on the big screen via USB input
●Crisp detail & contrast w/ Clear Resolution Enhancer
●Optimized picture based on what you’re watching
●Less grain & a clear picture w/ Digital Noise Reduction
●Theater-like movie viewing with 24p True Cinema
●One remote for multiple devices with BRAVIA® Sync™ 2
SECTION 1 - FEATURES AND OVERVIEW
SPECIFICATIONS
Sistema
Sistema de televisão Analógico: NTSC/PAL-M/PAL-N
Digital: SBTVD-T
Cobertura de canal VHF: 2-13
UHF: 14-69
CATV: 1-135
Sistema do Painel Painel LCD (Tela de Cristal Líquido)/Backlight de LED
Potência de saída dos Alto-
falantes (RMS)
KDL-40EX455/32EX355: 8 W + 8 W
1
(127 V CA, THD* 10% sinal 1 KHz, Alto-falante de 8 Ohms, Nível de entrada 500 mVrms.)
KDL-22EX355: 5 W + 5 W
1
(127 V CA, THD* 10% sinal 1 KHz, Alto-falante de 8 Ohms, Nível de entrada 500 mVrms.)
Entradas/Saídas
CABLE/ANTENNA Terminal externo de 75 ohms para entradas RF
VIDEO IN 1/2 VÍDEO: 1 Vp-p, 75 ohms não balanceados, sincronização negativa
ÁUDIO: 500 mVrms (Típico) / Impedância: 47 Kohms
COMPONENT IN
YP B P R (Vídeo componente): Y: 1,0 Vp-p, 75 ohms não balanceado, sincronização negativa /
P
B : 0,7 Vp-p, 75 ohms
P
R : 0,7 Vp-p, 75 ohms / Formato do sinal: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p
ÁUDIO: 500 mVrms (Típico) / Impedância: 47 Kohms
HDMI IN 1/2 HDMI:Vídeo: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 1080/24p
Áudio: Dois canais lineares PCM 32, 44,1 e 48 kHz, 16, 20 e 24bits, Dolby Digital
Entrada do PC
Saída de áudio, Fones de ouvido (minitomada)
DIGITAL AUDIO OUT
(OPTICAL)Sinal óptico PCM/Dolby Digital
ovitisop,smho57,p-pV7,0,BGRocigólana,nip-51bus-D
PC/HDMI IN 1 AUDIO IN
oedíVeacisúM,otoF
AUDIO OUT
PC IN
USB
Minitomada estéreo, 500 mVrms, (Típico) / Impedância: 47 Kohms
1. Cables sold separately.
2. Syncs with BRAVIA® Sync or Theatre Sync™ products.

KDL-22EX355/32EX355/40EX455 2
SECTION 1 - FEATURES AND OVERVIEW
*
1
Distorção Harmônica Total.
•A disponibilidade dos acessórios opcionais depende do estoque.
•Projeto e especicações técnicas sujeitos a alterações sem prévio aviso.
•Os pesos e dimensões são aproximados.
4,48,81,31)gk( latsedep moc
1,41,83,21)gk( latsedep mes
Controle remoto RM-YD081 (1)/Pilhas tamanho AA (2)/Manual de Instruções (1)/Guia
Rápido (1)/Folheto de Instruções de Segurança (1)/Licença de Software (1)/Folheto Ginga
(1)/Guia de montagem do pedestal (1)/Pedestal (1 conjunto)/ Parafuso (3)
comum a todos os modelos
Cabos de conexão / Kit de cinto de segurança
Nome do modelo KDL-40EX455 KDL-32EX355 KDL-22EX355
Energia e outros
Requisito de energia
Consumo de energia W 13W 77W 201
em uso
em modo de esperaMenos do que 1 W
Tamanho da tela(cm)Aprox. 101,6 Aprox. 80,0Aprox. 54,8
(polegadas m edidas
diagonalmente)
40 31,5 (classe 32) 21,6 (classe 22)
Resolução da tela
1.080 linhas (vertical)
1.366 pontos (horizontal) × 768 linhas (vertical)
001 × 53001 × 04)mm( )2( latot aerÁ/setnalaf-otlA
Dimensões com pedestal (mm) 941 × 617 × 233
sem pedestal (mm)941 × 577 × 72
padrão do furo de montagem
da parede
300 × 300200 × 100 100 × 100
tamanho do parafuso de
montagem da parede
M6 (8-12 mm) M4 (6,5-10 mm)
Peso
Acessórios fornecido
Acessórios opcionai
110-220 V CA, 60 Hz
534 × 376 × 147753 × 509 × 213
753 × 471 × 71 534 × 348 × 64
1.920 pontos (horizontal) ×
(mm)
(mm)

KDL-22EX355/32EX355/40EX455 3
SECTION 1 - FEATURES AND OVERVIEW
CHASSIS OVERVIEW
The primary circuits in the AZ3TK chassis consist of a Main Board (A Board), Power Supply Board (G22 Board for the 22” model, G32 Board for the 32” model,
and G40 Board for the 40” model), the IR Board (H Board), the L Board (L32 for the 32” model and L40 for the 40” model), the Switch Unit, and the LCD Panel
Assembly which includes the TCON Board.
NOTE: For connector part number information, refer to “Connectors” on page 22. For Wire Dressing information, refer to “Wire Dressing” on page 25.
SWITCH
UNIT
H
G
A
BOARD LAYOUT FOR KDL-22EX355

KDL-22EX355/32EX355/40EX455 4
SECTION 1 - FEATURES AND OVERVIEW
SWITCH
UNIT
H
G
L
A
BOARD LAYOUT FOR KDL-32EX355
SWITCH
UNIT
H
GLA
BOARD LAYOUT FOR KDL-40EX455

KDL-22EX355/32EX355/40EX455 5
SECTION 1 - FEATURES AND OVERVIEW
CPU: The CPU internal to the MT5389 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 MT5389 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
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:
●G22 for the 22” models
●G32 for the 32” models
●G40 for the 40” models
There are 2 distinct sections on the power supply:
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
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.
CONNECTOR BOARD
The Connector Board (L Board) is used to connect and convert the FFC/
LVDS cables.
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 (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 MT5389 processor. Below is a list of the key components located
on the Main 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).
MT5389 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
A/D converted and scaled (if necessary) to 1920 X 1080p 60HZ resolution.
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 amplier for processing and
amplication.
Audio Processing: Analog audio sources are selected and A/D converted
directly by the MT5389. The audio information is then processed digitally.
Digital audio from the tuner and HDMI sources is also input and processed.
Class D amplier provides the drive for the speakers.
HDMI Input and Switching: The customer can select the HDMI1 through
HDMI4 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-22EX355/32EX355/40EX455 6
SECTION 1 - FEATURES AND OVERVIEW
SWITCH UNIT
This board contains the power, channel and volume up/down, and menu
buttons.
LCD PANEL ASSEMBLY
The LCD Panel Assembly includes the LCD Panel, TCON Board, and LED
Backlight system.
The LCD Panel contains the actual liquid crystals, color lters, and
polarizers. The liquid crystals are manipulated by the applied voltage to
pass a specic amount of light - from the backlight - depending on the level
of voltage applied.
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 items.
●LCD Panel
●TCON Board
●LED Backlight system.
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. To determine if the TCON Board is available as a replacement
part, refer to the LCD Panels Manual.

KDL-22EX355/32EX355/40EX455 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. Most symptoms
that are correctable by software updates involve communications issues
with other devices or minor glitches in the operation of a specic 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
●Certain features not working correctly
(photo or video le 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,
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 uorescent 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
3 sec.
LED DISPLAY & BLINK COUNT

KDL-22EX355/32EX355/40EX455 8
SECTION 2 - TROUBLESHOOTING
VIEWING THE SELF CHECK DIAGNOSIS HISTORY
When an error is detected, the Self Check screen records the date(s) and
the number of times the error occurred. This is helpful in conrming 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.
1. TV must be in Standby mode.
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) <[ 25 ]>
Panel Selection <[ LTY320AN03 ]>
SERIAL NUMBER EDIT 8500001
MODEL NAME EDIT KDL-40EX455
[</>]Set [Home] Exit
Service Mode
4. Then press to view the Self Check screen.
Back <<
002 MAIN_ POWER 000
003 DC_ALERT1 000
003 AUDIO_PROT 000
004 BALANCER_ERR 000
000RRE_NOCT500
005 PANEL_ID_NVM_ERR 000
006 BACKLIGHT_ERR 000
000RRE_PMET700
00031 00046 00031
[Home] Exit
SELF CHEC
K
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.

KDL-22EX355/32EX355/40EX455 9
SECTION 2 - TROUBLESHOOTING
6X Blink - Backlight Inverter System Failure
If the inverter circuits fails to generate high voltage or one or more of
the backlight fails to light, the television will shut down and display this
diagnostics error.
7X Blink - Temperature Failure
A digital thermometer IC located on the Main Board provides a temperature
reading of the chassis and LCD panel. If the temperature exceeds a pre-
determined point the TV will shut down. If this problem occurs immediately
at turn-on, the temperature sensing IC has failed and replacing the main
board is required. If this occurs after the TV has been running for a while,
check for ventilation issues that could cause the TV to run hotter than
normal.
TRIAGE CHART
Use this general Triage Chart to determine what may possibly be causing the error before going out to the customers location.
1. Confirm the symptom from the customer. RED DOT: (Primary) Most likely defective part
2. Select that symptom from the chart. BLUE Triangle: (Secondary) Possible defective part
3. Bring the primary component listed for that symptom.
5. Chart Color Code
Power Audio
2X 3X 5X 6X 7X Dead setNo
Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
Main Board 
*▲ ▲
 
Power Supply 
***

H Board
LCD Panel
**

TCON
  ▲ ▲
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board

*TVImmediate Shuts Off After Power ON & 7X

***Backlight Does NOT Turn ON before TV Shuts
*NOTE: REFER TO LCD PANEL SERVICE
MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED

**BacklightTurns ON before TV Shuts Off
Video Protection Modes

KDL-22EX355/32EX355/40EX455 10
SECTION 3 - FLOW CHARTS AND DIAGRAMS
BLOCK DIAGRAM
Component/Composite
RF
HDMI 1
PC HD15
POWER SUPPLY
SWITCH
UNIT
LED
IR RX
LCD PANEL, TCON, &
LED BACKLIGHTS
A
H
L
R
ANALOG AUDIO OUT
OPTICAL AUDIO OUT
MT5389
A/V DECODER
A/V PROCESS
TUNER
USB
HDMI 2LVDS
BACKLIGHT POWER
AC IN
CLASS D
AUDIO
AMP
G
CONNECTOR
L
MAIN BOARD
(32”/40" ONLY)
IR BOARD
OVERALL BLOCK DIAGRAM

KDL-22EX355/32EX355/40EX455 11
SECTION 3 - FLOW CHARTS AND DIAGRAMS
NO POWER
ACD
PS_ON
+5.2V
1
2, 3
4
5, 6
+24VA
DIM
GND
+12V
7~9
10, 11
12
13
NC
ON/OFF
DET
14
15
AC IN (N)
AC IN (H)
1
2
CN9302
A
DET
ACD
+5.2V
1
2
3, 4
PS_ON
+24VA
5
6, 7
CN701
+12V
11, 12
DIM
ON/OFF
13
14
GND
8~10
G
CN901
LCD PANEL, TCON
&
LED BACKLIGHTS
LED1 +
1
N/C
LED2 +
2,3
4
CN8501
LED1 -
1
N/C
LWD2 -
2,3
4
CN8502
5
N/C
MAIN BOARD
POWER SUPPLY
(ALL MODELS)
(30”/40" ONLY)
POWER AND CONTROL BLOCK DIAGRAM