Sony KDL-32BX355 / KDL-40BX455 / KDL-46BX455 Service Manual ▷ View online
KDL-32BX355/40BX455/46BX455 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 lamps fails to light, the television will shut down and display this
diagnostics error. Observing for the presence of backlighting is crucial in
determining which component is likely at fault.
If the backlights turn on before the 6X shutdown occurs, it is safe to assume
If the backlights turn on before the 6X shutdown occurs, it is safe to assume
that the inverter circuits are functioning and one of the lamps failed to ignite.
Replacing the LCD Panel Assembly is necessary. If the backlights never
turn on before the 6X shutdown, the Inverter MT Board has failed. If this
board is available for replacement, replace it, if not, replace the LCD Panel
Assembly.
7X Blink - Temperature Failure
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.
2. Select that symptom from the chart.
3. Bring the primary component listed for that symptom.
2. Select that symptom from the chart.
3. Bring the primary component listed for that symptom.
o
i
d
u
A
r
e
w
o
P
2X 3X 5X 6X
7X
Dead set
No Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
Main Board
*
▲
▲
Power Supply
***
H
Inverter
▲*
LCD Panel
**
BLUE Triangle: (Secondary) Possible defective part.
5. Chart Color Code.
RED DOT: (Primary) Most likely defective part.
***Backlight Does NOT Turn ON before TV Shuts OFF
▲* Secondary Component
Video
Protection Modes
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board
* TV Immediate Shuts OFF After Power ON & 7X
**Backlight Turns ON before TV Shuts OFF
**Backlight Turns ON before TV Shuts OFF
*NOTE: REFER TO LCD PANELS SERVICE
MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED
ON SERIAL NUMBER.
MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED
ON SERIAL NUMBER.
KDL-32BX355/40BX455/46BX455 10
SECTION 3 - FLOW CHARTS AND DIAGRAMS
BLOCK DIAGRAM
To Panel
Tuner
DDR3 x 2
NAND Flash
MT5366
CVBS
KEYPAD
IR/ LED
HDMI1
Head PHONE
/ AUDIO OUT
/ AUDIO OUT
AMP
STA339BWTR
SPDIF OUT
VGA/HDMI AUDIO
USB
HDMI2
COMPONENT+COMPOSITE + AUDIO
Side I/O
Side I/O
VGA
．
IF 1
UART
SIL9185ACTU
CXD2828
DEMOD
MAX9728
IF 2
OVERALL BLOCK DIAGRAM
KDL-32BX355/40BX455/46BX455 11
SECTION 3 - FLOW CHARTS AND DIAGRAMS
NO POWER
UNREG24V
BL-ON
GND
BL_ERR
1~5
6~10
11
12
STBY3.3V
AUDIO_12V
AC_OFF_DET
POWER_ON
1
2
3
4
AUDIO_GND
BL_ERR
REG12V_GND
REG12V
5
6, 7
8, 9
10
BL_ON
TCON_12V
DIMMER
N/C
11
12
13
14
TCON_ON
15
AC IN (N)
AC IN (H)
1
2
CN6401
A
N/C
DIMMER
13
14
CN6402
REG 12V
GND
AUDIO_12V
8
5, 7, 9
10
DIMMER
BL_ERR
1
12
CN201
TCON_12V
14
AC_FF_DET
TCON_ON
3
15
BL_ON
13
STBY 3.3V
4
POWER_ON
2
G
INVERTER
CN6101
LCD PANEL &
CCFL BACKLIGHTS
POWER SUPPLY
MAIN BOARD
POWER AND CONTROL BLOCK DIAGRAM
KDL-32BX355/40BX455/46BX455 12
SECTION 3 - FLOW CHARTS AND DIAGRAMS
*For Part Number information, refer to
“Section 4 - Disassembly/Part Number Information” on page 16
.
No Power
Is standby LED
blinking?
No
Yes
No
See
Protection Shutdown
flowchart
Yes
Does red standby
LED on front panel
light?
Press power
button while
monitoring pin 3 of
CN6401 on power
supply board
High (3.3V)
on pin 3?
Yes
No
Main Board*
Power Supply
Board*
High (3.3V)
on pin 2?
Yes
No
Power Supply
Board*
Power Supply
Board*
NO POWER FLOWCHART
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