Sony KDL-22EX355 / KDL-32EX355 / KDL-40EX455 Service Manual ▷ View online
KDL-22EX355/32EX355/40EX455 8
SECTION 2 - TROUBLESHOOTING
VIEWING THE SELF CHECK DIAGNOSIS HISTORY
When an error is detected, the Self Check screen records the date(s) and
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
8500001
MODEL NAME EDIT
KDL-40EX455
[</>]Set [Home] Exit
Service Mode
4. Then press to view the
Self Check screen.
Back
<<
002 MAIN_ POWER
000
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
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-22EX355/32EX355/40EX455 9
SECTION 2 - TROUBLESHOOTING
6X Blink - Backlight Inverter System Failure
If the inverter 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
*NOTE: REFER TO LCD PANEL SERVICE
MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED
**Backlight Turns ON before TV Shuts Off
Video
Protection Modes
KDL-22EX355/32EX355/40EX455 10
SECTION 3 - FLOW CHARTS AND DIAGRAMS
BLOCK DIAGRAM
Component/Composite
RF
HDMI 1
PC HD15
POWER SUPPLY
SWITCH
UNIT
LED
IR RX
LCD PANEL, TCON, &
LED BACKLIGHTS
A
H
L
R
ANALOG AUDIO OUT
OPTICAL AUDIO OUT
OPTICAL AUDIO OUT
MT5389
A/V DECODER
A/V PROCESS
TUNER
USB
HDMI 2
LVDS
BACKLIGHT POWER
AC IN
CLASS D
AUDIO
AMP
G
CONNECTOR
L
MAIN BOARD
(32”/40" ONLY)
IR BOARD
OVERALL BLOCK DIAGRAM
KDL-22EX355/32EX355/40EX455 11
SECTION 3 - FLOW CHARTS AND DIAGRAMS
NO POWER
ACD
PS_ON
+5.2V
1
2, 3
4
5, 6
+24VA
DIM
GND
+12V
7~9
10, 11
12
13
13
NC
ON/OFF
DET
14
15
15
AC IN (N)
AC IN (H)
1
2
2
CN9302
A
DET
ACD
+5.2V
1
2
2
3, 4
PS_ON
+24VA
5
6, 7
CN701
+12V
11, 12
DIM
ON/OFF
13
14
14
GND
8~10
G
CN901
LCD PANEL, TCON
&
LED BACKLIGHTS
LED1 +
1
N/C
LED2 +
2,3
4
CN8501
LED1 -
1
N/C
LWD2 -
2,3
4
CN8502
5
N/C
MAIN BOARD
POWER SUPPLY
(ALL MODELS)
(30”/40" ONLY)
POWER AND CONTROL BLOCK DIAGRAM
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