Sony KDL-32BX320 / KDL-32BX321 / KDL-32BX420 / KDL-32BX421 / KDL-40BX420 / KDL-40BX421 / KDL-46BX420 / KDL-46BX421 Service Manual ▷ View online
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 28
SECTION 4 - TROUBLESHOOTING
DIAGNOSTIC CODE DESCRIPTIONS
The Diagnotic Table provides an overview of the number of times the Standby LED blinks and the possible location. To access the Triage
documents for the models listed in this manual, login into the Sony Authorized Servicer Portal at
www.sony.com/asp
.
Diagnostic Item
Diagnostic Item
Description
Number of times
Standby LED blinks
Possible Location
MAIN_POWER
Main Power Over Voltage Protection
2
G13 (Power) Board (for 32" models only)
G14 (Power) Board (for 40" models only)
G3 (Power) Board (for 46" models only)
A Board
BALANCER
Panel Balancer Error
4
NOT USED
TCON ERR
TCON Error
5
LCD Panel
BACKLITE
Backlight Error
6
LCD Panel
TEMP_ERR
Temperature Error
7
A Board
DC_ALERT AUD_PORT
DC Alert
Audio Error Detection
A Board
G13 (Power) Board (for 32" models only)
G14 (Power) Board (for 40" models only)
G3 (Power) Board (for 46" models only)
3
FIGURE 4-3. DIAGNOSTIC TABLE
NOTE: To provide information to customers regarding how to use their TV features or FAQs, refer the customer to the Sony esupport webstie
at
http://esupport.sony.com/.
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 29
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. 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 +)
Back
<<
002 MAIN_POWE
001
001 indicates an error was detected
003 AUD_PORT
000
000 indicates no error was detected
003 DC_ALERT
000
004 BALANCER
000
005 TCON_ERR
000
005 HFR_ERR
000
005 P_ID_ERR
000
005 PANEL_POWE
000
006 BACKLITE
000
007 TEMP_ERR
000
00000 00010 00000
[Menu] Exit
Panel Operation Time by Hour (max 99999)
Boot Count (max 99999)
Total Operation Time by Hour (max 99999)
SELF CHECK
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 30
SECTION 4 - TROUBLESHOOTING
CLEARING THE SELF CHECK DIAGNOSTIC LIST
Since the diagnostic results displayed on the screen are not
automatically cleared, always check the self-diagnostic history 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 the
Channel 8
Channel 0 .
To clear the Panel operation time: Press the Channel 7
Channel 0 .
EXITING THE SELF CHECK DIAGNOSTIC SCREEN
1. To exit the Self Diagnostic Self Check screen, turn off
the power to the TV by pressing the POWER button on
the remote or the POWER button on the TV.
TEST POINTS
Figure 5-5. Power and Control Block Diagram on page 35
contains the
board-to-board connector and pin information to identify voltages,
signal and control lines for troubleshooting purposes. All critical
voltages and control signals are easily accessed at the power supply
board. Use this drawing in conjunction with the previously discussed
troubleshooting techniques and flowcharts availalbe in
Section 5 -
Flow Charts and Diagrams on page 31
for testing operating voltages
and control signals.
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 31
SECTION 5 - FLOW CHARTS AND DIAGRAMS
VIDEO INFORMATION
No Video
Backlights
turned on?
Unplug LVDS
connector at
TCON while unit
is running. This
may need to be
done more than
once
Any flashes
seen on
screen?
Yes
No
TCON
(LCD Panel)
Any OSD
graphics
present?
No
A Board
No
TCON
(LCD Panel)
Yes
Yes
A Board
FIGURE 5-1. NO VIDEO FLOWCHART
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