Sony KDL-40EX725 Service Manual ▷ View online
KDL-40EX725 31
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
G4 Board
DC_ALERT
DC Regulator/Audio Error
AUD_PROT
Audio Error Detection
BALANCER
Balancer Error
4
LCD Panel
LD Board
TCON ERR
TCON Error
P_ID_ERR
Panel ID NVM Error
BACKLITE
Backlight Error
6
G4 Board
TEMP_ERR
Temperature Error
7
Ventilation
BATV Board
SOFTWARE
Softward Error
8
Service Bulletin (See Appendix Section)
Software Update
3
BATV Board
5
TCON Control MT Board
Figure 4-3. DiAgNOSTiC TABLe
KDL-40EX725 32
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:
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 4-3. 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.
KDL-40EX725 33
SECTION 5 - FLOW CHARTS AND DIAGRAMS
OVERVIEW
The following flow charts provide information to determine what repair parts to order based on the TV error.
KDL-40EX725 34
SECTION 5 - FLOW CHARTS AND DIAGRAMS
NO POWER
G4
LCD
PANEL
TCON
(120Hz)
LCD Panel Assembly
LCD
Panel
BATV
LED
Backlights
LD
24V
+109V
-61V to -82V
STBY
3.3V
Power-ON
3V
TCON-ON
3V
AC-OFF-Detect
3V
TCON
12V
AC
Input
IR Sensor
Motion Sensor
5V
39
STBY 3.3V
33
7
1
8
10
12
12
1
1
8
10
49
HMS3
HLR2
1
110VAC
CN6801
CN6151
CN1002
CN6002
CN2001
CN9006
3
CN6001
16
3
1
24
AU12V
REG 12V
TCON
12V
8
9
3
CN6001
14
12
LED-ON
LED-ON &
BL Control
3D Emitter
HEM2
1
12V
CN1001
CN1000
1
1
FIGURE 5-1. POWER SUPPLY DIAGRAM
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