Sony KDL-32EX550 Service Manual ▷ View online
KDL-32EX550 8
SECTION 2 - TROUBLESHOOTING
2X Blink - Main Power Error
A loss of REG12V from the power supply triggers this protect event. The
usual cause is a failure of the main switching supply. In some instances,
excessive loading on the secondary supply lines can cause the switching
regulator to stop, or fail again, if a replacement board is installed.
3X Blink- DC Regulator/Audio Error/HDMI/Tuner
Several items are monitored on the main board. Any error detected in the
following circuits will cause the television to shut down and generate a 3X
error:
●
Loss of regulated B+ circuits
●
Audio amplifier failure
●
HDMI equalizer IC
●
Tuner demodulator circuits
In most cases, replacement of the main board will remedy a 3X error.
4X Blink – Balancer Error
NOT USED IN THIS MODEL SERIES
5X Blink - TCON Error
The 5X blink protection mode indicates a communications error between
the TCON Board and the X-Reality microprocessor on the Main Board. If
the TCON is available for replacement, replace the TCON. If the TCON is
not available, the LCD panel must be replaced since the TCON circuit is
part of the LCD panel assembly. In rare cases a loose or defective LVDS
cable could also be the cause.
6X Blink - Converter System Failure
An open LED in the backlight strings will cause an over-voltage condition
in the converter circuits. The symptom will be a momentary appearance
of the backlights (Sony logo may appear) followed by a 6X shutdown.
Replacement of the LCD panel is required to remedy this condition.
If the converter fails to generate voltage for the LED backlights, the low-
If the converter fails to generate voltage for the LED backlights, the low-
voltage protection circuits are activated and the television will shut down
with a 6X error. Replacement of the Power Supply Board should remedy
this condition.
7X Blink - Temperature Failure
If the temperature inside the television becomes excessive, the temperature
sensor (located on the Main Board) notifies the TV to shut down and display
a 7X error. Excessive temperature errors will always occur when the TV
has been running a while and can be caused by excessive ambient heat or
improper ventilation of the television.
If the television shuts down immediately, this can be caused by a defective
If the television shuts down immediately, this can be caused by a defective
temperature sensing IC or failure of the communications bus between the
IC and the microprocessor. Replacement of the Main Board is necessary.
8X Blink – Not listed in Self Check
The 8X blink code is mainly used during TV software development. Look in
TV’s service Self Check for error code history and notice at the bottom of
the list WDT (Watch Dog Timer) error codes, in particular notice 103 HOST_
WDT. If this error code appears, check for any additional documentation on
the Sony ESI site.
10X Blink – IR Sync Transmitter Failure
NOT USED IN THIS MODEL SERIES
KDL-32EX550 9
SECTION 2 - TROUBLESHOOTING
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.
2. Select that symptom from the chart.
RED DOT: (Primary) Most likely defective part
3. Bring the primary component listed for that symptom.
▲
BLUE Triangle: (Secondary) Possible defective part
LAN Power
Audio
2X 3X 4X 5X 6X 7X 8X
No
WIFI
Dead set
No Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
Main Board
*
▲ ▲
▲
▲
Power Supply
HL
LCD Panel
▲
TCON
▲
▲
SERVICE BULLETIN
SOFTWARE UPDATE
WLAN
5. Chart Color Code
Video
Protection Modes
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board Reference
*
Immediate Shutdown After Power ON & 7X
*NOTE: REFER TO LCD PANEL SERVICE MANUAL IN REFERENCE
LIBRARY DATABASE FOR CORRECT REPLACEMENT PARTS
BASED ON SERIAL NUMBER.
KDL-32EX550 10
SECTION 3 - FLOW CHARTS AND DIAGRAMS
BLOCK DIAGRAM
VIDEO 2 CVBS/COMP
VIDEO 1 CVBS
RF
HDMI 1
PC HD15
SWITCH
UNIT
LED
IR RX
LIGHT SENSE
LCD PANEL
HFR
TCON
BAPS
HL
L
R
ANALOG AUDIO
OUT
OPTICAL
AUDIO OUT
HDMI 3
IC4601
AMP
IC5500
HDMI
SWITCH
EQ
TUNER
EITHERNET
USB2.0
HDMI 2
HDMI 4
LVDS
AC IN
IC9000
A/V
DECODER
VIDEO
PROCESS
USB2.0
USB HUB
LED BACKLIGHTS
POWER SUPPLY/
CONVERTER
L
R
IC4701
SUB-
WOOFER
AMP
GL2
OVERALL BLOCK DIAGRAM
KDL-32EX550 11
SECTION 3 - FLOW CHARTS AND DIAGRAMS
NO POWER
+OUT1
+OUT2
NC
NC
1
2
3
4
2
3
4
DC_DIMMER
BLINKING
PWM_DIMMER
BL_ERR
1
2
3
4
2
3
4
BL_ON
GND
DIGITAL_STBY
AU_GND
5
6
6
7, 8
9~12
REG12V
TCON_ON
AU_12V
STBY3.3V
13,14
17, 18
19
CN6601
CN6205
TCON_VCC
AUDIO_GND
AU_12V
REG12V
1
2, 4
3, 5
3, 5
12, 8
AUDIO_12V
STBY3.3V
7, 9
10
BLINKING
DIGITAL_STBY
POWER_ON
PWM_DIMMER
DC_DIMMER
CN6001
TO LED
BACKLIGHTS
BAPS
-OUT1
-OUT2
NC
NC
1
2
3
4
2
3
4
CN6602
AC_OFF_DET
POWER_ON
26
27
28
27
28
23
TCON_VCC
12
13
14
15
16
17
18
19
20
13
14
15
16
17
18
19
20
BL_ON
BL_ERR
AC_OFF_DET
TCON_ON
GL2
POWER AND CONTROL BLOCK DIAGRAM
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