Sony KDL-40EX640 / KDL-46EX640 / KDL-55EX640 Service Manual ▷ View online
KDL-40EX640/46EX640/55EX640 9
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
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
▲
▲
**Backlight Turns ON before TV Shuts Off
*NOTE: REFER TO LCD PANEL SERVICE
MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED
***Backlight Does NOT Turn ON before TV Shuts
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
To access the most recent version of the Triage documents for the models listed in this manual, login into the Sony Authorized Servicer Portal at
http://www.sony.com/asp
.
KDL-40EX640/46EX640/55EX640 10
SECTION 3 - FLOW CHARTS AND DIAGRAMS
BLOCK DIAGRAM
Component/Composite
RF
Composite
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
MT5396
A/V DECODER
A/V PROCESS
TUNER
USB 1
HDMI 2
LVDS
AC IN
CLASS D
AUDIO
AMP
GL5A (40")
GL5B (46")
GL5B (46")
HDMI 3
HDMI 4
HDMI 4
Ethernet
USB 2
GE55 (55")
MAIN BOARD
IR BOARD
OVERALL BLOCK DIAGRAM
KDL-40EX640/46EX640/55EX640 11
SECTION 3 - FLOW CHARTS AND DIAGRAMS
NO POWER
UNREG24V
BL-ON
GND
BL_ERR
1~5
6~10
11
12
12
STBY3.3V
AUDIO_12V
AC_OFF_DET
POWER_ON
1
2
3
4
2
3
4
AUDIO_GND
BL_ERR
REG12V_GND
REG12V
5
6, 7
8, 9
8, 9
10
BL_ON
TCON_12V
DIMMER
N/C
11
12
13
14
12
13
14
TCON_ON
15
AC IN (N)
AC IN (H)
1
2
2
CN6401
A
N/C
DIMMER
13
14
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
CN6101
LCD PANEL &
LED BACKLIGHTS
GL5A (40")
GL5B (46")
GL5B (46")
GE55 (55")
MAIN BOARD
POWER SUPPLY
KDL-40EX640/46EX640/55EX640 12
SECTION 3 - FLOW CHARTS AND DIAGRAMS
*For Part Number information, Refer to
“Section 4 - Disassembly/Part Number Information” on page 16
.
POWER AND CONTROL BLOCK DIAGRAM
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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