Sony KDL-32EX725 / KDL-46EX725 Service Manual ▷ View online
KDL-32EX725/46EX725/55EX725 31
SECTION 4 - TROUBLESHOOTING
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. In any of these cases, replace the Main Board to
fix this condition.
A defect on the Power Supply Board can cause a 3X blink protection
A defect on the Power Supply Board can 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 is defective.
4X Blink – Balancer Error
The 4X error code is only used on models incorporating local dimming
4X Blink – Balancer Error
The 4X error code is only used on models incorporating local dimming
LED backlighting. If a failure occurs on the LD board the TV will shut
down and display this diagnostic code. Models using conventional
non-local dimming LED backlighting do not utilize this error code.
5X Blink - TCON Error
The 5X blink protection mode indicates a communications error
5X Blink - TCON Error
The 5X blink protection mode indicates a communications error
between the TCON Board and the X-Reality microprocessor on the
Main Board. 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
NOTE: All models will make two attempts to power up before a 6X is
NOTE: All models will make two attempts to power up before a 6X is
activated. The SONY logo (Backlight) may or may not display on the
screen. However, the splash tones will be heard two times. After the
second attempt the TV will turn off and the standby LED will blink a
6X protection mode. (Note: The splash tone may not be heard if it is
turned off or the volume is set to minimum.)
If a 6X blink pattern is activated then a defect has occurred in one of
If a 6X blink pattern is activated then a defect has occurred in one of
the following areas.
● Defective Panel LED(s)
● Defective Power Supply
When troubleshooting a 6X backlight system failure it is key to notice
if the backlights illuminate before the TV shuts off. The following
list shows the possible backlight status and blink pattern and the
possible failed components.
1) Momentary Backlight and 6X
1) Momentary Backlight and 6X
a) Defective LED(s) (LCD Panel Assb.)
2) No Backlight and 6X
a) Replace Power Supply
In most cases, if the Sony logo (Backlight) momentarily illuminates
and the TV shuts off and a 6X is activated than one or more of the
backlight LEDs are defective. The LCD Panel assembly panel must
be replaced for a defective LED. However, before replacing the LCD
panel assembly check for a complete loss of the Negative Backlight
(-89V to -125V) power supply. The -89V to -125V power supply can
be checked at CN6702/pins 1 & 3.
KDL-32EX725/46EX725/55EX725 32
SECTION 4 - TROUBLESHOOTING
If there is no backlight before the TV shuts off and activates a 6X,
than check the Backlight ON signal from the TV microprocessor and
the Positive (+145V) Backlight power supply from the Power Supply
Board. The BL-ON signal can be checked at CN6704/pin 5 and the
+145V at CN6701/pins 1 & 3.
If the Backlight-ON signal is okay and the Positive Power supply
If the Backlight-ON signal is okay and the Positive Power supply
is missing then the Power Supply Board is defective. However, if
the Backlight-ON is missing then the X-Reality Microprocessor is
defective and the Main Board must be replaced to repair the problem.
7X Blink - Temperature Failure
These models do not display a temperature warning OSD dialogue
7X Blink - Temperature Failure
These models do not display a temperature warning OSD dialogue
box before shutting off and going into a 7X standby LED blink pattern.
The main objective when a 7X blink pattern occurs is to determine
which of the following possible defects is causing the excessive
temperature condition indication.
● Excessive Ambient Room Temperature
● Dust or Debris Blocking the TV Ventilation Apertures
● Defective Temperature Sensor or X-Reality Microprocessor
(Main 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
If the TV has an actual excessive temperature condition it will
take a considerable period of time to shut off and indicate a 7X
blink protection mode. This is because it will take time for the TV
components 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
devices.
● The TV should have at least 4 inches of clearance around
the sides & rear, and 11 inches of clearance over the top 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 after Power-ON then one
of the following components has failed (Not an Actual
Excessive Temperature Condition).
● X-Reality Microprocessor (Main Board)
● Temperature Sensor (Main Board)
In either case the Main Board must be replaced to fix the
problem.
KDL-32EX725/46EX725/55EX725 33
SECTION 4 - TROUBLESHOOTING
DIAGNOSTIC CODE DESCRIPTIONS
The Diagnostic Table provides an overview of the number of times the standby LED blinks and the possible location.
Diagnostic Item
Diagnostic Item
Description
Number of times
Standby LED blinks
Possible Location
MAIN_POWER
Main Power Error
2
G10 Board (32" Models Only)
G4 Board (40" Models Only)
G5 Board (46" Models Only)
G6 Board (55" Models Only)
DC_ALERT
DC Regulator/Audio Error
AUD_PROT
Audio Error Detection
BALANCER
Balancer Error
4
LCD Panel
LD Board
G8 Board (55" Models Only)
TCON ERR
TCON Error
P_ID_ERR
Panel ID NVM Error
BACKLITE
Backlight Error
6
G10 Board (32" Models Only)
G4 Board (40" Models Only)
G5 Board (46" Models Only)
G6 Board (55" Models Only)
TEMP_ERR
Temperature Error
7
Ventilation
BATV Board
EMITTER
Emitter Error
10
HEM2 Board
3
BATV Board
5
TCON Control MT Board
FIGURE 4-3. DIAGNOSTIC TABLE
KDL-32EX725/46EX725/55EX725 34
SECTION 4 - TROUBLESHOOTING
VIEWING THE SELF CHECK DIAGNOSTIC HISTORY
It is possible to bring up past occurrences of a failure for confirmation
on the Self Check diagnostic history screen. This feature is useful for
failures which are intermittent or when the customer is not sure what
is causing the television to shut down.
1. TV must be in standby mode. (Power off).
2. Press the following buttons on the Remote Commander
within a second of each other:
3.
DISPLAY
Channel
5
Volume
-
POWER
.
* NOTE: This differs from accessing Service Adjustments Mode
(Volume +)
Total operation time by hour (MAX:65535)
Boot count (MAX:65535)
Panel operation time by hour (MAX:65535)
Total operation time by hour (MAX:65535)
Boot count (MAX:65535)
Panel operation time by hour (MAX:65535)
-------------- -------------- -------------- 01
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
002 MAIN_POWE
003 DC_ALERT
003 AUD_PROT
004 BALANCER
005 HFR_ERR
005 P_ID_ERR
12345-00333-06789
12345
-
00333
-
06789
-
-
-------------- -------------- -------------- 00
006 VLED
-------------- -------------- -------------- 00
005 TCON_ERR
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
006 BACKLITE
007 TEMP_ERR
010 EMITTER
-------------- -------------- -------------- 00
007 FAN_ERR
-------------- -------------- -------------- 00
012 IA
-------------- -------------- -------------- 00
SELF CHECK
StandBy LED Flash Count
Diagnostic Item
Diagnostic Item
Error Count
(00-99)
-------------- -------------- -------------- 00
-------------- -------------- -------------- 00
101 VPC_WDT
-------------- -------------- -------------- 00
102 MEPS_WDT
-------------- -------------- -------------- 00
103 HOST_WDT
-------------- -------------- -------------- 00
104 STBY_WDT
-------------- -------------- -------------- 00
000 RGB_SEN
000 RESERVED
000 RESERVED
FIGURE 4-4. SAMPLE SELF CHECK DIAGNOSIS PAGE
CLEARING THE SELF CHECK DIAGNOSTIC LIST
Since the diagnostic results displayed on the screen are not
automatically cleared, always check the self-diagnostic screen after
you have completed the repairs to be sure you have cleared the
result display to 0.
1. To clear the Error history and Error count
press
8
0
.
RESETTING THE LCD PANEL OPERATING HOURS
The 3 sets of numbers displayed on the lower left corner of the screen
indicates the total accumulated operating hours of the television and
the operating hours of the LCD panel. Total operating hours is on the
left, boot count in the center and panel hours in the right group (The
center numbers are not used.)
1. To clear the LCD Panel operating hours of the LCD
Panel after replacing the panel, press
7
0
.
EXITING THE SELF CHECK DIAGNOSTIC SCREEN
1. To exit the Self Diagnostic screen, turn off the power to
the TV by pressing the
POWER
button on the remote
or the
POWER
button on the TV.
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