Sony KDL-32EX720 / KDL-32EX723 / KDL-40EX720 / KDL-40EX723 / KDL-46EX720 / KDL-46EX723 / KDL-55EX720 / KDL-55EX723 Service Manual ▷ View online
KDL-32EX720/32EX723/40EX720/40EX723/46EX720/46EX723/55EX720/55EX723 35
OVERVIEW
This chapter provides information regarding the Self Diagnosis feature
in our TVs.
UPDATING THE SOFTWARE
As mentioned in
“Section 2 - Software Requirements” on page 18
there are several issues that may be resolved by updating the
software to the latest version. For a list of possible correctable issues
see
“Examples of Software Correctable Symptoms” on page 20
.
SECTION 4 - TROUBLESHOOTING
Self Diagnosis
Supported model
KDL-32EX720/32EX723/40EX720/40EX723/46EX720/46EX723/55EX720/55EX723 36
SECTION 4 - TROUBLESHOOTING
TRIAGE CHART
Use this general 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.
Chassis:
AZ2F
2. Select that symptom from the chart.
3. Bring
ONLY THE MOST LIKELY PART
for that symptom.
4. Follow the troubleshooting charts in the technical guides to isolate the board.
RED DOT: Most likely defective part
LAST UPDATED:
6/2/2011
No
Power
WIRELESS
LAN
Remote
Audio
2
3
4
No Backlight
4
Momentary
Backlight
5
6
*7
8
10
No Green
Power LED
(Dead Set)
No video
Whole
Screen
Distortion
Isolated
area
Distortion
No 3D
Double
images on
3D
Not Working
No
Remote
No Audio
BATV Board
▲
▲
▲
▲
Power Supply Board
▲
G8 Board (55")
HLR2 Board
HEM2 Board
Wireless Card (EX723)
LD Board
Service Bulletin
Software Update
TCON Board
LCD Panel
Problem
POWER
AUDIO/
POWER
BACK-LIGHT
BACK-LIGHT
TCON
CONV
TEMP
WDT
IR
SYNC
5. Chart Color Code
BLUE TRIANGLE: Secondary possible defective part
Reference
* ONLY IF 7X SHUTDOWN OCCURS IMMEDIATLEY
Video
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences
This Triage document is for general reference purposes. 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-32EX720/32EX723/40EX720/40EX723/46EX720/46EX723/55EX720/55EX723 37
SECTION 4 - TROUBLESHOOTING
PROTECTION SHUTDOWN
Self Diagnosis
Supported model
Critical voltages and circuit operations are monitored by the CPU
on the Main Board. If a fault is detected the Self-Diagnostic function
in the TV will force the TV to shut down by the CPU. The monitored
circuit in which the fault occurred will cause the CPU to flash the
standby LED in groups of repeating sequences. The number of
blinks in these groups identifies which voltage or circuit caused the
protection event.
Not all of the available protect codes are used in every model. For
Not all of the available protect codes are used in every model. For
example, models that are LED backlit do not use the 4-blink balancer
error as this circuit is found in models that are backlit with fluorescent
lamps. The information in this section contains the protect circuits and
diagnostics codes used in the models listed in this manual.
“Figure
4-3. Diagnostic Table” on page 41
provides guidance in locating the
possible component causing the shutdown.
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-32EX720/32EX723/40EX720/40EX723/46EX720/46EX723/55EX720/55EX723 38
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)
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