Sony KDL-32EX355 / KDL-40EX455 Service Manual ▷ View online
KDL-32EX355/40EX455 5
SECTION 1 - FEATURES AND OVERVIEW
SWITCH UNIT
This board contains the power, channel and volume up/down and menu
buttons.
LCD PANEL ASSEMBLY
The LCD Panel Assembly includes the LCD Panel, TCON Board and LED
Backlight system.
The LCD Panel contains the actual liquid crystals, color filters and polarizers.
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 TCON performs all the control, timing, charge and discharge functions
The TCON performs all the control, timing, charge and discharge functions
driving the operation of the LCD Panel.
A new LCD Panel Assembly will include the following items:
A new LCD Panel Assembly will include the following items:
●
LCD Panel
●
TCON Board
●
LED Backlight system
TCON BOARD
The TCON Board communicates between the LCD Panel and the
microprocessor on the Main Board.
NOTE: The TCON Board is not available as a replacement part for all
NOTE: The TCON Board is not available as a replacement part for all
models. To determine if the TCON Board is available as a replacement
part, refer to the LCD Panels Manual.
KDL-32EX355/40EX455 6
OVERVIEW
This chapter provides information regarding the Self Diagnosis feature in
our TVs.
UPDATING THE SOFTWARE
The Self Diagnosis function is designed to provide information regarding
the problem with the TV, however, there are several issues that may be
resolved by updating the TV software to the latest version. Most symptoms
that are correctable by software updates involve communications issues
with other devices or minor glitches in the operation of a specific function.
Below is a list of some of the symptoms that may be corrected with a
software update:
●
Fluctuations in picture brightness
●
Intermittent picture freezing or noise
●
Problems with certain inputs (especially HDMI)
●
Intermittent or distorted audio
●
Erratic remote control operation
●
TV turns on and off by itself
●
Loss of color
●
Internet connectivity (internet models only)
●
Certain features not working correctly
(photo or video file viewing)
SECTION 2 - TROUBLESHOOTING
Self Diagnosis
Supported model
SELF DIAGNOSIS FUNCTION
Critical voltages and circuit operations are monitored by the CPU on the
Main Board. If an error is detected the Self Diagnosis function in the TV will
force the TV to shut down by the CPU. The monitored circuit in which the
fault occurred will automatically cause the CPU to blink the Standby LED
in groups of repeating sequences. The number of times the Standby LED
blinks indicates the possible cause of the problem.
Not all of the available protect codes are used in every model. For example,
Not all of the available protect codes are used in every model. For example,
models that don’t have the local dimming feature do not use the 4X blink
error as this circuit is found in models that are backlit with fluorescent lamps.
The information in this section provides guidance in locating the possible
component causing the shutdown.
STANDBY LED BLINK COUNT
Standby LED
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
LED DISPLAY & BLINK COUNT
KDL-32EX355/40EX455 7
SECTION 2 - TROUBLESHOOTING
VIEWING THE SELF CHECK DIAGNOSIS HISTORY
When an error is detected, the Self Check screen records the number of
times the error occurred. This is helpful in confirming past occurrences of
an error, and for determining if an error is intermittent when the customer is
not sure what is causing the television to shut down. If the screen displays
a 0, no error has occurred.
1. TV must be in Standby mode.
2. Press the following buttons on the
2. Press the following buttons on the
Remote Commander within a
second of each other:
DISPLAY
Channel
5
Volume
+
POWER
3. To access the Self diagnosis history page, press until
Self
diagnosis history is highlighted.
Sound Adjustment
>>
Wide Band Tuning
>>
Range Scan…
>>
Self diagnosis history
>>
Status Information…
>>
LVDS Spectrum(%0)
<[
25
]>
Panel Selection
<[
LTY320AN03
]>
SERIAL NUMBER EDIT
9000001
MODEL NAME EDIT
KDL-40EX455
[</>]Set [Home] Exit
Service Mode
4. Then press to view the
Self Check screen.
Back
<<
002 MAIN_ POWER
001
003 DC_ALERT1
000
003 AUDIO_PROT
000
004 BALANCER_ERR
000
0
0
0
R
R
E
_
N
O
C
T
5
0
0
005 PANEL_ID_NVM_ERR
000
006 BACKLIGHT_ERR
000
0
0
0
R
R
E
_
P
M
E
T
7
0
0
00031
00046
00031
[Home] Exit
SELF CHECK
Indicates
an error
has occurred
Indicates
no error
has occurred
SAMPLE SELF CHECK DIAGNOSIS PAGE
2X Blink - Main Power Error
A loss of REG12V from the power supply triggers this protect event. The
usual cause is a failure of the main switching supply. In some instances,
excessive loading on the secondary supply lines can cause the switching
regulator to stop, or fail again, if a replacement board is installed.
3X Blink- DC Regulator/Audio Error
The REG 5V and D3.3V source originating on the Main Board is monitored
for low-voltage conditions by the CPU. A failure causing a 3X shutdown
requires replacing the Main Board.
4X Blink – Balancer Error
NOT USED IN THIS MODEL SERIES.
5X Blink - TCON Error/Panel Error
The 5X blink protection mode indicates a communications error with the
timing control circuits (TCON Board) has occurred. If the TCON Board is
available for replacement, replace it, if not, replace the LCD Panel Assembly.
In rare cases a loose or defective LVDS cable could also be the cause.
KDL-32EX355/40EX455 8
SECTION 2 - TROUBLESHOOTING
6X Blink - Backlight Converter System Failure
If the Converter Circuits fails to generate high voltage or one or more of
the backlight fails to light, the television will shut down and display this
diagnostics error.
7X Blink - Temperature Failure
A digital thermometer IC located on the Main Board provides a temperature
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.
TRIAGE CHART
Use this general Triage Chart to determine what may possibly be causing the error before going out to the customers location.
1. Confirm the symptom from the customer.
RED DOT: (Primary) Most likely defective part.
2. Select that symptom from the chart.
BLUE Triangle: (Secondary) Possible defective part.
3. Bring the primary component listed for that symptom.
5. Chart Color Code.
Power
Audio
2X 3X 5X 6X 7X
Dead set
No
Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
Main Board
*
▲
▲
Power Supply
***
H Board
LCD Panel
**
TCON
▲
▲
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board
* TV Immediate Shuts OFF After Power ON & 7X
***Backlight Does NOT Turn ON before TV Shuts OFF
*NOTE: REFER TO LCD PANELS SERVICE
MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED
**Backlight Turns ON before TV Shuts OFF
Video
Protection Modes
ON SERIAL NUMBER.
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