Sony KDL-32EX425 / KDL-46EX525 Service Manual ▷ View online
KDL-32EX425/46EX525 23
SECTION 4 - TROUBLESHOOTING
TRIAGE CHART
Use the Triage Chart to determine what may possibly be causing the error before going out to the customers location.
Before you make the service call…
1. Confirm the symptom from the customer.
2. Select that symptom from the chart.
▲
3. Bring all the boards listed for that symptom.
LAN Power
Audio
2X
3X
4X*
4X** 5X 6X
7X No
WIFI
Dead set
No Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
Main Board
*
▲
▲
▲
Power Supply
▲
HEM2
LD
LCD Panel
TCON
WIFI
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board Reference
Protection Modes
Video
* Immediate Shutdown After Power ON & 7X
4X** No Backlight before Shut OFF
BLUE Triangle: (Secondary) Possible defective part
5. Chart Color Code
RED DOT: (Primary) Most likely defective part
*NOTE: REFER TO LCD PANEL SERVICE MANUAL IN REFERENCE
LIBRARY DATABASE FOR CORRECT REPLACEMENT PARTS
BASED ON SERIAL NUMBER.
▲*
Sharp Vertical or Horizontal Lines, Missing Pixels
4X* Momentary Backlight before Shut OFF
KDL-32EX425/46EX525 24
SECTION 4 - TROUBLESHOOTING
PROTECTION SHUTDOWN
Self Diagnosis
Supported model
The models in this manual contain a self-diagnostic function. If an
error occurs, the standby LED will automatically begin to flash. The
number of times the LED flashes translates to a probable source of
the problem.
A history of the errors is stored on the Self Check diagnostic page as
A history of the errors is stored on the Self Check diagnostic page as
shown in
”Figure 4-4. Sample Self Check Diagnosis Page” on page
29
. This page can be used to review the failure occurrence data stored
in memory to reveal past problems and how often these problems
occured. If there is more than one error, the standby LED will identify
the first of the problem areas. If the Self Check screen displays a “0”,
no error has occurred.
STANDBY LED FLASH COUNT
Ambient Sensor/
(IR) Infrared Receiver
Picture Off /
Timer LED
Standby LED
Power LED
FIGURE 4-1. LED DISPLAY
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
FIGURE 4-2. BLINK COUNT
KDL-32EX425/46EX525 25
SECTION 4 - TROUBLESHOOTING
2X Blink - Main Power Error
A 2X protection mode blink pattern can be activated due one of the
following defects.
● Loss of REG12V (LVP)*
● Loss of -125V (Single Line)
● Excessive -125V Level (OVP)*
● Loss of Power-ON Signal
● Excessive PFC Voltage (OVP)
● Excessive PFC Temperature (OTP)
*Low Voltage Protection (LVP)
*Over Voltage Protection (OVP)
*Over Voltage Protection (OVP)
A loss or excessive condition of the REG12VDC secondary voltage
from the main power supply IC6351 will cause a 2X blink pattern on
the standby LED. The 12Vdc can be checked at CN6704/pin 16.
If the measurement is 0V or rises above 12Vdc (approaches 15V)
If the measurement is 0V or rises above 12Vdc (approaches 15V)
before the TV shuts down the Power Supply Board is defective.
If approximately 12Vdc is present and remains below 12Vdc before
If approximately 12Vdc is present and remains below 12Vdc before
shutdown then further troubleshooting is necessary to determine the
defective component.
After confirming proper REG12V levels, check the Negative LED
After confirming proper REG12V levels, check the Negative LED
Backlight supply levels. A loss or excessive condition of the negative
supply will cause a 2X blink failure. The voltage level can be checked
at CN6701/pins 1 & 3 before the TV shuts off. There will be 2 to 4
wires (Red & Blue) depending on the panel size. All individual wires
should be checked for proper voltage level. In normal operation the
voltage level will initially rise to approximately -175V and then should
regulate down to between 89V and 125V depending on the Backlight
adjustment in the User Menu. If one of the negative supplies is 0V
or rises above -175V before shut-off then the Power Supply Board is
defective, replace it to fix the problem.
A defective X-Reality processor on the Main Board or Switch circuit
A defective X-Reality processor on the Main Board or Switch circuit
on the Power Supply Board will cause a loss of the Power-ON signal
(2X). To determine which component is defective check the Power-
ON voltage level at CN6704/pin 1. In normal operation 3V should be
measured. If the 3V is present before shut-off then the Power Supply
Board is defective. If 0V is measured before shut-off then the Main
Board is defective.
Finally, there are PFC protection circuits on the Power Supply Board
Finally, there are PFC protection circuits on the Power Supply Board
that when activated will cause a 2X blink protection mode. The PFC
circuit is monitored for both over-voltage and over-temperature.
Therefore, if all the previously discussed circuits checkout okay,
there could still be a problem on the Power Supply Board in the PFC
circuit causing the 2X blink. Replacing the Power Supply Board will
fix the TV.
3X Blink- DC Regulator/Audio Error
The Audio error can occur due on of the following error conditions.
3X Blink- DC Regulator/Audio Error
The Audio error can occur due on of the following error conditions.
● Defective DC Regulator on Main Board
● Shorted or Damaged Speaker Connections
● Defective Audio Amplifier (Main Board)
● Loss of AU12V (Open F4200 on Main Board)
● Loss of AU12V (Open Fuse on Power Supply Board)
KDL-32EX425/46EX525 26
SECTION 4 - TROUBLESHOOTING
The first thing to check when a 3X blink protection mode occurs is
the physical condition of the speakers and speaker connections. The
speakers should measure 8 ohms. Shorted speakers or connections
can cause a 3X blink protection mode.
If the speakers and connections check okay, then the defective
If the speakers and connections check okay, then the defective
component is on the Main Board. Either an open F4200, defective
DC Regulator, or defective Audio amplifier will cause a 3X blink
protection mode. In any of these cases, replace the Main Board to
fix this condition.
A defect on the Power Supply Board can cause a 3X blink protection
A defect on the Power Supply Board can cause a 3X blink protection
mode and shut-off. Check the AU12V level at CN6704/pin 14. If 0V is
measure before shut-off the Power Supply Board is defective.
4X Blink – Balancer Error
The 4X error code is only used on models incorporating local dimming
4X Blink – Balancer Error
The 4X error code is only used on models incorporating local dimming
LED backlighting. If a failure occurs on the LD board the TV will shut
down and display this diagnostic code. Models using conventional
non-local dimming LED backlighting do not utilize this error code.
5X Blink - T-CON Error
The 5X blink protection mode indicates a communications error
5X Blink - T-CON Error
The 5X blink protection mode indicates a communications error
between the T-CON Board and the X-Reality microprocessor on
the Main Board. If the T-CON is available for replacement, replace
the T-CON. If the T-CON is not available, the LCD panel must be
replaced since the T-CON circuit is part of the LCD panel assembly.
In rare cases a loose or defective LVDS cable could also be the
cause.
6X Blink - Backlight System Failure
NOTE: All models will make two attempts to power up before a 6X is
NOTE: All models will make two attempts to power up before a 6X is
activated. The SONY logo (Backlight) may or may not display on the
screen. However, the splash tones will be heard two times. After the
second attempt the TV will turn off and the standby LED will blink a
6X protection mode. (Note: The splash tone may not be heard if it is
turned off or the volume is set to minimum.)
If a 6X blink pattern is activated then a defect has occurred in one of
If a 6X blink pattern is activated then a defect has occurred in one of
the following areas.
● Defective Panel LED(s)
● Defective Power Supply
When troubleshooting a 6X backlight system failure it is key to notice
if the backlights illuminate before the TV shuts off. The following
list shows the possible backlight status and blink pattern and the
possible failed components.
1) Momentary Backlight and 6X
1) Momentary Backlight and 6X
a) Defective LED(s) (LCD Panel Assb.)
2) No Backlight and 6X
a) Replace Power Supply
In most cases, if the Sony logo (Backlight) momentarily illuminates
and the TV shuts off and a 6X is activated than one or more of the
backlight LEDs are defective. The LCD Panel assembly panel must
be replaced for a defective LED. However, before replacing the LCD
panel assembly check for a complete loss of the Negative Backlight
(-89V to -125V) power supply. The -89V to -125V power supply can
be checked at CN6702/pins 1 & 3.
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