Read Sony KDL-40BX450 / KDL-40BX451 / KDL-46BX450 / KDL-46BX451 Service Manual online
KDL-40BX450/40BX451/46BX450/46BX451 8
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.
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
Inverter
▲*
LCD Panel
**
TCON
▲
▲
▲* Secondary Component
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board
* TV Immediate Shuts Off After Power ON & 7X
*NOTE: REFER TO LCD PANEL SERVICE
MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED
ON SERIAL NUMBER.
**Backlight Turns ON before TV Shuts Off
***Backlight Does NOT Turn ON before TV Shuts
Video
Protection Modes
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