Sony KDL-32EX421 / KDL-32EX520 / KDL-32EX521 / KDL-32EX523 / KDL-40EX520 / KDL-40EX521 / KDL-40EX523 / KDL-46EX520 / KDL-46EX521 / KDL-46EX523 Service Manual ▷ View online
KDL-32EX421/32EX423/32EX520/32EX521/32EX523/40EX520/40EX521/40EX523/46EX520/46EX521/46EX523 31
SECTION 4 - TROUBLESHOOTING
TRIAGE CHART
Use this general Triage Chart to determine what may possibly be causing the error before going out to the customers location.
KDL-32EX421/32EX423/32EX520/32EX521/32EX523 ONLY
Before you make the service call…
1. Confirm the symptom from the customer.
Chassis
: AZ2F
2. Select that symptom from the chart.
3. Bring
3. Bring
ONLY THE MOST LIKELY PART
for that symptom.
4. Follow the troubleshooting charts in the technical guides to isolate the board.
RED DOT: Most likely defective part
LAST UPDATED:
10/21/2011
WIRELESS
LAN
Remote Audio
2
3
4
5
6
*7
8
Green LED
Constant ON
No Green
Power LED
(Dead Set)
No video
Whole
Screen
Distortion
Isolated
area
Distortion
Not Working
No
Remote
No Audio
BATV BOARD
▲
▲
POWER SUPPLY BOARD
HLR2 BOARD
Wireless LAN Card
Service Bulletin
(See Appendix Section)
Software Update
TCON Board
▲
▲
LCD Panel
Problem
POWER
AUDIO/
POWER
BACK-
LIGHT
TCON
BACK-
LIGHT
TEMP
WDT
* ONLY IF 7X SHUTDOWN OCCURS IMMEDIATLEY
Reference
5. Chart Color Code
BLUE TRIANGLE: Secondary possible defective part
Video
No
Power
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences
KDL-32EX421/32EX423/32EX520/32EX521/32EX523/40EX520/40EX521/40EX523/46EX520/46EX521/46EX523 32
SECTION 4 - TROUBLESHOOTING
KDL-40EX520/40EX521/40EX523/46EX520/46EX521/46EX523 ONLY
Before you make the service call…
1. Confirm the symptom from the customer.
Chassis:
AZ2F
2. Select that symptom from the chart.
3. Bring
3. Bring
ONLY THE MOST LIKELY PART
for that symptom.
4. Follow the troubleshooting charts in the technical guides to isolate the board.
RED DOT: Most likely defective part
LAST UPDATE:
10/21/2011
Remote Audio
2
3
4
5
6
*7
8
Green LED Blinking
Constantly ON/OFF
Cycling
No Green
Power LED
(Dead Set)
No video
Whole
Screen
Distortion
Isolated
area
Distortion
No
Remote
No Audio
BATV BOARD
▲
▲
POWER SUPPLY BOARD
HLR2 BOARD
Service Bulletin
(See Appendix Section)
Software Update
TCON Board
▲
▲
LCD Panel
Problem
POWER
AUDIO/
POWER
BACK-
LIGHT
TCON
BACK-
LIGHT
TEMP
WDT
* ONLY IF 7X SHUTDOWN OCCURS IMMEDIATLEY
Reference
5. Chart Color Code
BLUE TRIANGLE: Secondary possible defective part
Video
No
Power
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences
These Triage documents are for general reference purposes. To access the most recent version of the Triage documents for the models listed
in this manual, login into the Sony Authorized Servicer Portal at
http://www.sony.com/asp
.
KDL-32EX421/32EX423/32EX520/32EX521/32EX523/40EX520/40EX521/40EX523/46EX520/46EX521/46EX523 33
SECTION 4 - TROUBLESHOOTING
PROTECTION SHUTDOWN
Self Diagnosis
Supported model
Critical voltages and circuit operations are monitored by the CPU
on the Main Board. If a fault is detected the Self-Diagnostic function
in the TV will force the TV to shut down by the CPU. The monitored
circuit in which the fault occurred will cause the CPU to flash the
standby LED in groups of repeating sequences. The number of
blinks in these groups identifies which voltage or circuit caused the
protection event.
Not all of the available protect codes are used in every model.
Not all of the available protect codes are used in every model.
For example, models that are LED backlit do not use the 4-blink
balancer error as this circuit is found in models that are backlight
with fluorescent lamps. The 4-blink error is however, used to identify
an issue with the LD Board for models that contain a LD Board.
The information in this section contains the protect circuits and
diagnostics codes used in the models listed in this manual.
“Figure
4-3. Diagnostic Table” on page 33
provides guidance in locating the
possible component causing the shutdown.
STANDBY LED FLASH COUNT
Ambient Sensor/
(IR) Infrared Receiver
Picture Off /
Timer LED
Standby LED
Power LED
FIGURE 4-1. LED DISPLAY
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
FIGURE 4-2. BLINK COUNT
KDL-32EX421/32EX423/32EX520/32EX521/32EX523/40EX520/40EX521/40EX523/46EX520/46EX521/46EX523 34
SECTION 4 - TROUBLESHOOTING
2X Blink - Main Power Error
A loss of REG12V from the power supply triggers this protect
A loss of REG12V from the power supply triggers this protect
event. This symptom is usually remedied by replacing the power
supply board. If the error continues after the power supply board
is replaced, suspect excessive loading which is causing the power
supply to shut down. This is usually caused by a failure of the inverter
circuits. Unplug the inverter and turn the TV back on. If a 6X error is
displayed, the inverter (or LCD panel) must be replaced.
3X Blink- DC Regulator/Audio Error
The first thing to check when a 3X blink protection mode occurs is
3X Blink- DC Regulator/Audio Error
The first thing to check when a 3X blink protection mode occurs is
the physical condition of the speakers and speaker connections. The
speakers should measure 8 ohms. Shorted speakers or connections
can cause a 3X blink protection mode.
If the speakers and connections check okay, then the defective
If the speakers and connections check okay, then the defective
component is on the main board. Either an open F4200, defective
DC Regulator, or defective Audio amplifier will cause a 3X blink
protection mode which would require replacing the main board.
A defect on the Power Supply Board may also cause a 3X blink
A defect on the Power Supply Board may also cause a 3X blink
protection mode and shut-off. Check the AU12V level at CN6704/pin
14. If 0V is measure before shut-off the power supply board needs
to be replaced.
5X Blink - TCON Error
A communications error with the timing control circuits (TCON) has
5X Blink - TCON Error
A communications error with the timing control circuits (TCON) has
occurred. If the TCON is available for replacement, replace the
TCON. If the TCON is not available, the LCD panel must be replaced
since the TCON circuit is part of the LCD panel assembly. In rare
cases a loose or defective LVDS cable could also be the cause.
6X Blink - Backlight System Failure
If the inverter circuits fails to generate high voltage or one or more
If the inverter circuits fails to generate high voltage or one or more
of the backlight lamps fails to light, the television will shut down
and display this diagnostics error. Observing for the presence of
backlighting is crucial in determining which component is likely at
fault.
If the backlights turn on before the 6X shutdown occurs, it is safe
If the backlights turn on before the 6X shutdown occurs, it is safe
to assume that the inverter circuits are functioning and one of the
lamps failed to ignite. Replacing the LCD panel is necessary. If the
backlights never turn on before the 6X shutdown, the inverter has
failed. If the inverter is available for replacement, replace the inverter.
If the inverter is not available, replace the LCD Panel.
7X Blink - Temperature Failure
A digital thermometer IC located on the main board provides a
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.
8X Blink – Not listed in Self Check
8X blink code is mainly used during TV software development. Look
8X Blink – Not listed in Self Check
8X blink code is mainly used during TV software development. Look
in TV’s service SELF CHECK for error code history and notice at the
bottom of the list WDT (Watch Dog Timer) error codes, in particular
notice 103 HOST_WDT.
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