Sony KLV-40ZX1M (RM-VL610A Remote... Installation guide

LCD Monitor
EX1S Chassis
Model:
KLV-40ZX1M
Triage and Troubleshooting Guide
Course: CTV-54
Training Manual
Front View Side View

CTV-54 i
Section 1 - Chassis Layout ................................................. 3
Model Introduction ........................................................... 6
A/V Input Connection ....................................................... 6
HDMI .................................................................................... 6
PCB and Component Descriptions .................................. 6
B-Board ............................................................................... 6
LD1-Board ........................................................................... 6
GS1-Board ........................................................................... 7
HSL-Board ........................................................................... 7
H4L-Board ........................................................................... 7
H3L-Board ........................................................................... 7
H1L-Board ........................................................................... 7
TV-STAND ........................................................................... 7
LCD Panel Assembly ........................................................... 7
All-White LED Edge Backlight System .......................... 7
Section 2 - Troubleshooting ................................................ 8
Power & Backlight Systems Block Diagram .................... 8
GS1-Board Connector Diagram ...................................... 9
LD1-Board Connector Diagram ..................................... 10
Power System Troubleshooting ......................................11
Normal Operation ...............................................................11
Failure Symptoms .............................................................. 12
No Power/Dead Set (TV will not Turn ON) .................. 12
2X Protection Mode Blink Pattern ................................ 12
6X Protection Mode Blink Pattern ................................ 12
Table of Contents
LED Backlight System Troubleshooting ........................ 13
Normal Operation .............................................................. 13
Failure Symptoms .............................................................. 13
No Backlight & 6X Protection Blink Pattern ................. 13
Momentary Backlight & 6X Protection Blink Pattern .... 14
Protection Mode System Block Diagram ....................... 15
Protection Mode System Troubleshooting ......................... 16
2 Bink - Power Error (12V) ........................................... 16
3 Blink- Regulator Error (5V) ....................................... 16
6 Blink - Backlight Error ............................................... 16
7 Blink - Temperature Error .......................................... 16
8 Blink - Audio Error ..................................................... 17
10 Blink - Trident Communications Error ..................... 17
12 Blink - HFR Communications Error ......................... 17
14 Blink - TCON Communications Error ...................... 17
Video System Block Diagram ........................................ 18
Video System Troubleshooting ...................................... 19
Normal Operation .............................................................. 19
DEMO Mode Test .............................................................. 19
Missing Video .................................................................... 19
Distorted Video .................................................................. 19
Unique Main Video Board (B-Board) or LVDS Cable Ef-
fects ....................................................................... 20
Unique LCD Panel Assembly Effects (including BT3-
Board) .................................................................... 20
Common Main Video Board (B-Board) and LCD Panel
Assembly Effects ................................................... 20

CTV-54 ii
Table of Contents
LVDS Waveform Diagram .............................................. 21
Audio System Block Diagram ........................................ 22
Audio System Troubleshooting ...................................... 23
Normal Operation .............................................................. 23
Missing Audio ..................................................................... 23
Distorted Audio .................................................................. 23
Section 3 - Technical Troubleshooting Flowcharts ........ 24
Section 4 - Service Mode, Error History, and Factory Re-
set .................................................................................... 32
Section 5 - Disassembly & Assembly .............................. 35
Rear Cover Removal Diagram ...................................... 35
BT3-Board Removal Diagram ....................................... 36
Sub-Chassis Removal Diagram .................................... 37
Rear Cover Installation Diagram ................................... 38

CTV-54 3
Section 1 - Chassis Layout
MODEL PICTURE
FIGURE 1-1
Front View Side View
Total Depth
1"-1/8"
(9.9mm)
LED Backlight
System
TV-STAND 2.1
Speaker System

CTV-54 4
Chassis Layout
GS1-Board
LD1-Board
H4L-Board
KLV-40ZX1M
BT3-Board
(TCON)
HSL-Board
B-Board
H3L-Board H1L-Board
TV-STAND
Speaker
Connector
TV-STAND
L/R Speaker
Sub-Woofer Speaker
AC Input HDMI Input USB Input
PCB LAYOUT DIAGRAM
FIGURE 1-2

CTV-54 5
Chassis Layout
PCB DESCRIPTION DIAGRAM
FIGURE 1-3
LED Backlight Power Supply
Circuits
LD1-Board
AC
Input
B-Board
BE (TV) Microprocessor
Trident Processor :
Video Processing
HDMI Processing
HDCP Processing
IP (Image Processor)
Scan Converter (Scalar)
Temperature Sensor
Audio DSP
Audio Output Amplifier
Control
Power/Drive
LVDS
Keys
SIRCS
Power &
LED Control
LCD Panel Assembly
LCD PANEL
Power Key
Function Keys
H1L-Board
A/V Digital
& Data
Edge LED
Backlight System
LEDs
H3L-Board
IR Sensor
H4L-Board
HDMI Input
EDID EEPROM
USB 1.1
HSL-Board
Power
Main Power Supply
Standby Power Supply
AC Relay
GS1-Board
Power
Control
BT3-Board
TCON
HFR
Power
LCD Panel
R
L
TV-STAND
Sub
Woofer

CTV-54 6
Chassis Layout
Model Introduction
The KLV-40ZX1M is an ultra-thin LCD monitor measuring a meager 1”-
1/8” (9.9mm) in depth and weighs only 26 pounds. As mentioned, this
is a monitor, so it does not contain a RF tuner to receiver television
programming. Furthermore, there is only one video/audio input on this
model - the digital high-quality HDMI input. Therefore, to receive and
display channel programming a STB or DVR with an internal RF tuner
must be connect to the HDMI input. The monitor can also be connected
to a DVD or Blu-ray player through the HDMI connector to receive high-
quality video and audio.
The LCD panel is a Full High-Definition 1080p resolution panel. The
backlight is produced using a Wide Color Gamut LED edge light system.
This system provides high contrast ratio with more accurate color and
blacker blacks. To further enhance the color reproduction a 10-bit
processor and 10-bit panel are combined in this model.
The model also includes the Motionflow™ 120Hz technology which
enhances sharpness and delivers smooth motion for fast-action sports
and movies. And finally, this model contains the BRAVIA® Engine™ 2
fully digital video processor.
A/V Input Connection
HDMI
This input provides reception of uncompressed digital video and multi-
channel audio over a single cable connection.
PCB and Component Descriptions
Reference Figures 1-1 & 1-2
B-Board
The circuits located on the B-Board perform all Video and Audio processing
functions. It also contains all the microprocessor control circuits. The
following circuits are included on this board.
• BE (TV) Microprocessor
• TRIDENT Processor
- Video Signal Processing
- HDMI Signal Processing
- Scan Converter
- HDCP Processing
• Audio DSP
• Audio Amplifier
• Temperature Sensor
LD1-Board
This board contains three power converter circuits to drive the top, bottom,
left, and right edge LED backlight system. The drive outputs for the LED
system are between 56Vdc and 95Vdc.

CTV-54 7
Chassis Layout
GS1-Board
Except for some regulator circuits on the B-Board, the GS1-Board is the
power supply system board, which includes the following components
and circuits.
• Main Power Supply
o 12V for Audio, BT3-Board, and LD1-Board Circuits
• Standby Power Supply
o 3.3V for standby circuits
• 390V for Backlight Circuits (LD1-Board)
• 18V for Backlight Circuits (LD1-Board)
HSL-Board
• HDMI Terminal Connection
• EDID EEPROM
• USB Service Only Terminal Connection
H4L-Board
• IR Sensor
H3L-Board
• Power LED
• Timer LED
• Standby LED
H1L-Board
• Power Key
• Function Keys
TV-STAND
The TV-STAND contains the speaker system which includes left, right,
and sub-woofer speakers. The speaker system is replaced as assembly
or speaker module.
NOTE: The LCD Panel (video) will work fine with the TV Stand disconnected.
The audio output mute lines on the BM3-Board are activated.
LCD Panel Assembly
The LCD Panel Assembly includes the LCD Panel, BT3-Board (TCON/
HFR), and LED Backlight system.
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 panel resolution on the EX1S chassis model
is 1920 X 1080 lines. This is considered a 1080P Full High-Definition
model.
The BT3-Board (TCON & HFR) performs all the control, timing, charge,
and discharge functions driving the operation of the LCD Panel. The HFR
(High Frame Rate) section performs the 60Hz to 120Hz frame refresh rate
conversion.
All-White LED Edge Backlight System
Reference Figure 1-3
The top, bottom, left, and right edge LEDs generate the white light that is
captured and evenly spread across the panel by a Light Guide Plate. The
captured light then passes through the liquid crystals in the LCD Panel.
The light guide operates in the same way a fiber optic cable operates.
There is a light source which generates the light and the fiber optic cable
(glass fibers) retains the light within its boundaries.

CTV-54 8
Section 2 - Troubleshooting
GS1-Board
LD1-Board
B-Board
LVDS
LCD Panel Assembly
LCD PANEL
AC
Input
LED
PS
LED
PS
LED
PS
Stby 3.3V
(Power 1)
Power-On
BL_ON
AC_DET
INV_ERR
Dimmer
IC3001
BE
Micro
Reg 12V
AU12V
+
+
+
-
-
-
+
+
-
-
Inv_Err
BL_ON
Dimmer
12V
PS = Power Supply
BL = Backlight
INV = Inverter
DET = Detect
Relay
RY6001
Audio
Amplifier
9V Reg
Edge LED
Backlight System
IC2505
5V Reg
12V
12V
CN6159
CN6156
CN6157
CN6158
CN6780
CN6781
CN6783
CN6782
CN6784
390 V
To each
PS
18V
To Each
PS
CN6501
CN6500
18V
390 V
CN6000
CN2500
CN2502
CN2501
CN4700
Q6404
SW
REC
PFC
IC6200
STBY
PS
F6001
R6016
F6150
REC
REC
IC6501
Main
PS
Interface
IC2504
1.8V &
3.3V Reg
IC2503
1V & 2.5V
Reg
F2502
F2504
F2503
IC3501
1.8V Reg
3
5
1
8
7
2
1
3
9
3
2
1
6
6
3
2
1
3
3
3
1
2
7
8
9
3
1
2
Reg 12V
47
\
51
BT3-Board
TCON
HFR
1
\
28
19V
LCD Panel
CN6720
CN6721
F2001
IC4700
Trident
Q2502
12V Reg
Panel 12V
F2501
Power 2
Power 3
Power 4
Regs
ON
19V
3
2
3V
0V
3V
3V
1V – 3V
58Vdc to 95Vdc
58Vdc to 95Vdc
58Vdc to 95Vdc
58Vdc to 95Vdc
Top & Botton 68Vdc to 95Vdc
Left & Right 58Vdc to 78Vdc
Power & Backlight Systems Block Diagram
POWER & BACKLIGHT SYSTEM
FIGURE 2-1

CTV-54 9
Troubleshooting
F1
AC Input
CN6159
CN6156
CN6157
CN6158
CN6500
CN6501
AC Relay
4 – Grnd
3 – Grnd
2 – 12V
1 – 12V
8 – Grnd
7 – Grnd
6 – Reg_12V
5 – Reg_12V
4 – AU_12V
3 – AU_12V
2 – AU_Grnd
1 – AU_Grnd
9 – Dimmer (1Vmin to 3Vmax)
8 – Backlight ON/OFF (3V)
7 – INV_ERR (0V)
6 – NC
5 – Grnd
4 – Grnd
3 – STBY 3.3V
2 – AC_OFF_DET (3V)
1 – POWER_ON (3V)
6 – 12V
5 – Grnd
4 – Grnd
3 – Dimmer (1Vmin to 3Vmax)
2 – Backlight ON/OFF (3V)
1 – INV_ERR (OV)
2 – PFC_OUT
1 – PFC_OUT
2 – PFC_Grnd
1 – PRI_VCC (18V)
390Vdc
NOTE: Use PFC-Grnd as
reference to check 390V & 18V
GS1-Board
GS1-BOARD CONNECTOR DIAGRAM
FIGURE 2-2
GS1-Board Connector Diagram

CTV-54 10
Troubleshooting
CN6781 & CN6782
CN6783 & CN6784
CN6781
CN6782
CN6783
CN6784
LS Positive & Negative Voltages = 58Vdc to 95Vdc
LS-T & LS -B measure towards 70Vdc
LS-L & LS-R measure towards 85Vdc
2 – PFC_OUT
1 – PFC_OUT
2 – PFC_Grnd
1 – PRI_VCC (18V)
390Vdc
CN6720
CN6721
1 – INV_ERR
2 – BL_ON
3 – Dimmer
6 – 12V
CN6780
LD1-Board
LD1-BOARD CONNECTOR DIAGRAM
FIGURE 2-3
LD1-Board Connector Diagram

CTV-54 11
Troubleshooting
Power System Troubleshooting
Normal Operation
Reference Figure 2-1
110VAC is applied to the GS1-Board, and can be measured at CN6000.
In the standby mode the AC power passes through the main fuse F6001,
R6001 (Inrush resistor), and BD6001 and is applied to the Main DC/DC
Converter IC6501 and the Standby DC/DC Converter IC6200. IC6501
is not active in the standby mode. However, IC6200 is active in standby
mode and outputs STBY 3.3Vdc as long as AC power is applied to the
TV (and the GS1-Board). The Standby 3.3Vdc is supplied to the BE-
Microprocessor, H1L-Board (Power Key), and H4L-Board (IR Sensor) in
the standby mode.
Once an ON command is received form the remote controller or the power
button on the H1L-Board the BE-Microprocessor outputs the Power-ON
signal. The Power-On signal is applied to the GS1-Board. On the GS1-
Board the Power-On signal switches the 19V from the standby power
supply to activate the relay (RY6001), PFC, and Main Power supply. One
relay click is heard at power-on. The relay engages to bypass the inrush
resistor R6001 during the ON state.
The BE-Microprocessor also outputs additional Power.-On signals to
activate all the voltage regulators on the B-Board to complete the TV
power on sequence
The main power supply IC6501 is now active and outputting a single 12Vdc
secondary supply. This single 12Vdc secondary supplies the following
four sections in the TV.
• B-Board Audio Output Amplifier (AU12Vdc)
• B-Board Voltage Regulators (Reg 12Vdc)
• BT3-Board (Reg 12Vdc)
• LD1-Board (Reg 12Vdc)
The GS1-Board also supplies 390Vdc and 18Vdc to the LD1-Board (LED
Backlight Power Board). The 390Vdc supplies each converter high-power
output switching transistors, and the 18V is the VCC for each converter
IC on the LD1-Board.

CTV-54 12
Troubleshooting
Failure Symptoms
An actual power supply (GS1-Board) failure will cause one of the following
failure symptoms.
• No Power/Dead Set (AC LVP or STBY 3.3Vdc)
• 2X Protection Blink Pattern (12Vdc LVP or OVP)
• 6X Protection Blink Pattern (18Vdc LVP)
NOTE: The protection LED blink patterns occur using the RED Power
LED at the lower right of the front panel.
No Power/Dead Set (TV will not Turn ON)
Reference Figure 2-1
In a dead set condition there will be No Green Power-LED illumination
and No Relay Click.
The following bullet list gives the possible failures for a “No Power/Dead
Set” condition.
• Loss of AC Power (AC Outlet)
• Loss of AC_OFF_DET (GS1-Board)
• Loss of Standby 3.3Vdc (GS1-Board)
• Defective Main Microprocessor (B-Board)
The first step in troubleshooting a “No Power/Dead Set” condition is to
confirm that 110VAC power from an active AC outlet is applied to the
GS1-Board. AC power is applied to, and can be measured at CN6000
on the GS1-Board. After confirming that AC power is applied to CN6000
check that the AC is detected by the GS1-Board. Check the AC_OFF_
DET voltage at CN6157/pin 2. The voltage level should be 3.3V when the
GS1-Board successfully detects the AC power input. If the voltage is 0V a
dead set conditon will occur. In this case, replace the GS1-Board.
After confirming the AC power, check for a defective Standby 3.3Vdc power
supply IC6200. To confirm a defective IC6200 check the 3.3V secondary
voltage at CN6157/pin 3. As long as AC power is applied to the TV IC6200
should be active and outputting 3.3Vdc.
Finally, a “Dead Set” condition can be caused by a defective BE
microprocessor IC3001. The main microprocessor outputs the Power-
On signal which activates switch Q6404 and passes the 19V from the
Standby power supply to activate the relay, PFC, and Main Power Supply
on the GS1-Board. If the Power-On signal is not output after receiving the
power-on command the GS1-Board circuits remain inactive and a “Dead
Set” condition exists. The Power-On signal can be checked at CN6157/
pin 1. It should measure approximately 3V.dc If the measurement is 0Vdc
before shut-off the BE microprocessor is defective.
2X Protection Mode Blink Pattern
A loss or excessive condition of the 12Vdc secondary voltage from the
main power supply IC6501 will cause a 2X blink pattern on the Power-
LED. The 12Vdc can be checked at CN6156/pin 3.
If the measurement is 0V or rises above 12Vdc before the TV shuts-off the
GS1-Board is defective.
If approximately 12Vdc is present and remains below 12Vdc before shut-
off then the B-Board is defective.
Before replacing the GS1-Board for a failure confirm that the B-Board is
sending the Power-On command to turn on the power supply circuits on
the GS1-Board. The Power-On voltage can be checked at CN6157/pin 1.
The normal voltage level at power-on is 3Vdc.
If the 3Vdc is not present before shut-off replace the B-Board. If the 3Vdc
is present replace the GS1-Board.
6X Protection Mode Blink Pattern
Although a 6X protection blink pattern normally indicates a backlight error,
a defect on the GS1-Board can cause this indication. A loss of the 18Vdc
from the main power supply on the GS1-Board will cause a 6X. Because
the 18Vdc is the supply voltage to the LD1-Board backlight converter ICs,
a loss of it causes no converter function, and consequently no backlight
and 6X. The 18Vdc can be checked at CN6501/pin 3. The voltage should
measure approximately 18Vdc before shut-off. If measurement is 0Vdc
the GS1-Board is defective. If 18V is present the LD1-Board is defective.

CTV-54 13
Troubleshooting
LED Backlight System Troubleshooting
Reference Figure 2-1, 2-2, and 2-3
Normal Operation
The LD1-Board is the power supply for the LED backlighting. It takes the
390Vdc from the GS1-Board and converts it to highly regulated positive
and negative 58Vdc to 95Vdc LED drive voltages. These voltages can be
measured at CN6781, CN6782, CN6783, and CN6784.
Control voltages from the B-Board are also supplied to the LD1-Board.
The BL_ON signal turns on the backlights. The Dimmer controls the
backlight level. The INV_ERR which is normally low goes to 3V during a
backlight error.
The panel backlighting illuminates approximately 5 seconds after the H1L-
Board or remote control power button is pressed. The backlight remains
illuminated and the information banner is immediately displayed. The
video is then display after another 2 seconds.
Failure Symptoms
NOTE: The protection LED blink patterns occur using the RED Power
LED at the lower right of the front panel.
An actual Backlight (LED) or Backlight power supply (LD1-Board) failure
will cause one of the following failure symptoms.
• No Backlight & 6X Protection Blink Pattern
• Momentary Backlight & 6X Protection Blink Patter
The first step in troubleshooting a backlight error is to view the screen
and note the state of the backlight before shut-off and 6X. Does the
backlight momentarily illuminate or is there no backlight at all? This one
step provides valuable information in locating the defective component.
Reference the following two sections for more details concerning each
symptom.
No Backlight & 6X Protection Blink Pattern
Video and audio may or may not be present before shut-off. Although
there is no backlight the presence of video can be confirmed by shining a
flashlight on the front TV screen. Video can be seen in the lighted area.
NOTE: To confirm that the LD1-Board is actually detecting a backlight
failure check the INV-ERR volatge at CN6780/pin 1. The voltage will go
high 2V at power on and then low 0V when the backlight is turned off.
This cycle will occur twice as the microprocessor makes two attempts
to illuminate the backlights. After two attempts the TV shuts off and a 6X
blink pattern is activated.
The following failures can cause a “No Backlight & 6X“ condition.
• Defective LD1-Board
• Loss of 18Vdc (GS1-Board)
• Loss of BL_ON/OFF Signal (B-Board)
• Loss of 390Vdc (GS1-Board - connection only)
• Loss of 12Vdc (GS1-Board - connection only)
Before replacing the LD1-Board check the supply voltages and control
signal needed for proper function of the board. First check the 18Vdc
supply from the GS1-Board at CN6721/pin 3. If the 18Vdc in missing
replace the GS1-Board.
If the 18V is present check for the BL_ON control signal from the B-Board.
The BL_ON is normally 3V at CN6780/pin 2. If this voltage is missing
replace the B-Board.
If the power-on 3V is present then check the 390Vdc and 12Vdc connections
between the GS1-Board and the LD1-Board. Check the following physical
connections as indicated.
• 390V - CN6500 (GS1-Board) to CN6720 (LD1-Board)
• 12V - CN6157 (GS1-Board) to CN6780 (LD1-Board)
If all the previous voltages and the control signal check okay and the TV
still shuts-off and indicates a 6X replace the LD1-Board.

CTV-54 14
Troubleshooting
Momentary Backlight & 6X Protection Blink Pattern
The following two failures can cause a “Momentary Backlight & 6X”
condition.
• Defective Panel LED or LEDs
• Defective LD1-Board (single voltage output)
NOTE: To confirm that the LD1-Board is actually detecting a backlight
failure check the INV-ERR volatge at CN6780/pin 1. The voltage will go
high 2V at power on and then low 0V when the backlight is turned off.
This cycle will occur twice as the microprocessor makes two attempts
to illuminate the backlights. After two attempts the TV shuts off and a 6X
blink pattern is activated.
When the TV is initially turned on the backlight will momentarily come
on 2 times and then the TV shuts-off and indicates a 6X protection blink
pattern. The backlight system makes 2 attempts to light the LEDs. The AC
relay clicks three times with a few seconds between each click. After the
final relay click the 6X is activated.
First check the LD1-Board outputs at CN6781, CN6782, CN6783, and
CN6784. The voltage measurement at CN6781 and CN6783 will be a
positive 56Vdc to 95Vdc level, and the measurement at CN6782 and
CN6784 will be a negative 56Vdc to 95Vdc level. The labels on the
connectors are as follows.
LS-B (Bottom Edge)
LS-T (Top Edge)
LS-R (Right Edge)
LS-L (Left Edge)
The bottom and top voltages will measure towards the 85Vdc level and
the left and right voltages will measure towards the 70Vdc level.
If one or more outputs are missing replace the LD1-Board.
If all the voltages are present and the TV is still shutting off and indicating
a 6X blink pattern then the LCD Panel assembly is defective.

CTV-54 15
Troubleshooting
PROTECTION
MODE SYSTEM
FIGURE 2-4
B-Board
DC_Alert
3X
IC3011
BE
Micr0
F2502
2X
Standby 3.3V
DC_Detect
5V
GS1-Board
Main
PS
AC
Input
STBY
PS
CN6156
CN6157
CN6000
PFC
IC2005
5V Reg
Interface
Circuit
3V12V
Power ON
SW
RECT Relay
IC3502
Temp
Sensor
70C
LD1-Board
LED
PS
LED
PS
LED
PS
+
+
+
-
-
-
+
+
-
-
Inv_Err
BL_ON
Dimmer
12V
9V Reg
CN6780
CN6781
CN6783
CN6782
CN6784
390V
To each
PS
18V
To Each
PS
12V
12V
Inv_Err
BL_ON
Dimmer
INV_ERR
6X
18V
390V
Temp_ERR
7X
IC2004
Audio
Amp
Protection Circuit
Q2004, Q2005
Q2009, Q2010
Audio_ERR
8X
To
Pedistal
Speakers
IC4007
Trident
Processor
Trident_ERR
11X
LCD Panel Assb
BL TCON_ERR
12X
HFR_ERR
14X
SDA (I2C)
53
33
11
99
88
77
1
2
3
6
6
3
2
1
CN2000
CN4700
1V to 3V
3V
0V
19V
18V
(Power 1)
CN2500
CN2501
12V
F6150
TCON/
HFR
12V
12V
CN6159
CN6501
CN6500
CN6720
CN6721
1
Protection Mode System Block Diagram

CTV-54 16
Troubleshooting
Protection Mode System Troubleshooting
Reference Figure 2-4
The KLV-40ZX1M includes the following protection mode blink patterns.
NOTE: All protection mode blink patterns occur using the RED Power-
LED at the lower right front of the TV.
2 Bink - Power Error (12V)
The 2X Power-LED blink pattern basically indicates a power supply error.
Something has caused the main power supply IC6501 not to output
the 12V secondary voltage. The 12V is monitored directly by the BE-
Microprocessor on the B-Board. If the 12V is not detected at power-on, a
2X blink pattern is activated.
This blink pattern can also be caused by a missing Power-On signal from
the B-Board. Reference the “2X Protection Mode Blink Pattern” description
in the Power Supply Troubleshooting section for more details.
3 Blink- Regulator Error (5V)
The 3X protection mode blink can only be caused by a defective 5V
regulator IC2505 or an open F2502 on the B-Board. Therefore, if the TV
is shutting-off and a 3X blink pattern is activated replace the B-Board.
6 Blink - Backlight Error
The 6X protection mode blink pattern is caused by any error in the backlight
system including the LEDs in the LCD Panel assembly. Reference the
“LED Backlight System Troubleshooting” section for more details on
troubleshooting when this blink pattern occurs.
7 Blink - Temperature Error
This model does not display a temperature warning OSD dialogue box
before shutting-off and going into a 7X Power-LED blink pattern. It will just
shut-off and activates a 7X.
The main objective when a 7X blink pattern occurs is to determine which
of the following possible defects is causing the excessive temperature
indication.
• Excessively Ambient Room Temperature
• Dust or Debris Blocking the TV Ventilation Apertures
• Defective Temperature Sensor IC3502 or BE-Microprocessor
(B-Board)
The first step is to notice how long it takes the TV to shut-off and trigger a
7X blink protection mode.
If the TV has an actual excessive temperature condition it will take a
considerable period of time to shut off and activate a 7X blink protection
mode. This is because it will take time for the TV to heat up and for the
temperature sensor to detect the excessive temperature and shut the TV
off
If the TV takes a considerable period of time to shut off check the following
items:
• The TV should not be located too close to any heating
elements.
• The TV should have at least 4 inches of clearance around all
sides to ensure adequate ventilation.
• Check that all vented areas on the TV are clear of all Dust and
Debris.
If the TV shuts off immediately (Not an Actual Excessive Temperature
Condition) after the TV powers ON then one of the following components
has failed.
• Main Microprocessor IC3011 (B-Board)
• Temperature Sensor IC3502 (B-Board)
In either case, the B-Board must be replaced to fix the problem.

CTV-54 17
Troubleshooting
8 Blink - Audio Error
The 8X blink protection mode occurs when one of the audio outputs is
shorted, a DC voltage level is present on the outputs, or the AU12V is
missing. In most cases, an audio problem will exist within the audio circuit,
which is located completely on the B-Board. However, before replacing
the B-Board perform the following checks.
• Check the AU12V at CN2502/pin 3 on the B-Board. If 12V
is present replace the B-Board. If the 12V is missing check
the connections at CN2502 (B-Board) and CN6156 (GS1-
Board).
• Check the TV-STAND speakers and/or speaker
connections for damage. The speakers should measure
8 ohms. Check all connectors and wiring for damage.
Replace and repair components where needed.
If the TV still shuts off (8X) then the problem is with the Main microprocessor,
and consequently, the B-Board must be replaced.
10 Blink - Trident Communications Error
Replace the B-Board when the 10X protection mode blink pattern occurs
12 Blink - HFR Communications Error
First replace the LCD Panel assembly (includes the BT3-Board) if the
12X protection mode blink pattern occurs. If the panel does not repair the
problem then the B-Board must be defective.
14 Blink - TCON Communications Error
First, check the 12V at CN6159/pin 1 on the GS1-Board. The 12V is a
fused (F6150) supply voltage to the TCON/HFR board. The fuse is located
on the GS1-Board, therefore, a GS1-Board failure (open fuse can activate
a 14X blink pattern.
Second, check the 12V at CN4700/pins 47-51 on the B-Board. The 12V
is a fused (F2501) supply voltage to the TCON/HFR board. The fuse
is located on the B-Board, therefore, a B-Board failure (open fuse can
activate a 14X blink pattern.
If the 12V checks okay, first replace the LCD Panel assembly (includes
the BT3-Board). If the panel does not repair the problem then the B-Board
must be defective.

CTV-54 18
Troubleshooting
B-Board
IC4700
Trident
(HDCP)
HDMI
LCD Panel Assembly
BP3-Brd
TCON
HFR
LCD
Panel
LED Backlight
System
CN4700
1
/
28
Digital
Video
GS1-Board
BL-ON
Dimmer
Min 1.4V
Max 3.2V
4V
IC4704
NAND FLASH
User Data
White Balance
GAMMA
User Menu Service Mode
CN2500 CN6157
8
9
7
INV-ERR
IC3001
BE
Micro
LD1-Board
390V
18V
8
9
7
12V
CN6158
CN6159
12V
CN6780
LED Backlight
Power
Supplies
47
/
51
12V
USB 1.1
(Service Only)
LCD Panel
3
2
1
66
3
2
1
1
HSL-Board LVDS Cable
HDMI
Interface
LVDS Cable
CN4202
CN1502
IC1500
NVM
(EDID)
5
3
CN6156CN2501
Q2502
12V Reg
F2501
F6150
1
0V
CN6500
CN6501
CN6720
CN6721
2
1
2
VIDEO SYSTEM
FIGURE 2-5
Video System Block Diagram

CTV-54 19
Troubleshooting
Video System Troubleshooting
Reference Figure 2-5
Normal Operation
IMPORTANT: Before proceeding with the following video troubleshooting
procedures it is assumed that the TV is turning on with the Green Power-
LED is illuminated, Backlight is illuminated (bright raster), and the Audio
is present.
When a video problem occurs you will experience one of the two following
symptoms.
Input Status:
• Missing Video
• Distorted Video
Video Anomaly:
• Poor Detail
• Moving Video Distortion (e.g. Bars)
• Static H/V Lines (black, white, or color)
• White Balance
• Gamma
The main objective when troubleshooting one of the previously listed
symptoms is to determine if the defect exists in the following sections of
the TV system.
• LCD Panel Assembly (Includes the BT3Board)
• B-Board
DEMO Mode Test
The KLV-40ZX1M contains a DEMO Mode that is generated on the BT3-
Board and can be activated by completely disconnecting the LVDS cable
from the BT3-Board. The rear cover must be removed to access the BT3-
Board and the LVDS connector. Once the rear cover is removed perform
the following procedure to activate the DEMO Mode. The DEMO Mode test
can be used for troubleshooting a missing or distorted video condition.
1) Turn the TV OFF
2) Disconnected the LVDS cable from the BT3-Board
3) Turn the TV ON
4) The TV will automatically go into the DEMO Mode. The display
will cycle through various color rasters for 2 minutes. After that
the TV shut off and activate a 12X blink pattern on the RED
Power LED
5) If DEMO displays and is not distorted then the LCD Panel
Assembly (including the BT3-Board) is okay and the B-Board
must be replaced.
6) If the DEMO Mode does not display then the LVDS signal levels
should be physically checked at CN4700 on the B-Board with
an oscilloscope to confirm that the B-Board is generating the
video signals before replacing the LCD Panel Assembly. If
the DEMO Mode contains the distortion then the LCD Panel
Assembly is causing the distortion and must be replaced.
Missing Video
If the video is completely missing you will first use the On-Screen-Display
(OSD) to possibly isolate the defect to the B-Board or the LCD Panel
Assembly.
NOTE: If audio is present with no video then the HSL-Board is most likely
okay and the defective component is either the BM3-Board or the LCD
Panel assembly.
If the USER Menu can be displayed then the LCD Panel assembly is
okay, and you can safely assume the defect exists on the B-Board.
However, if the USER Menu OSD cannot be displayed you need to do
further troubleshooting because either IC4700 is not sending the OSD or
the LCD Panel assembly is not able to display the OSD.
Distorted Video