Sony KDL-40HX755 / KDL-46HX755 / KDL-55HX755 Service Manual ▷ View online
KDL-40HX755/46HX755/55HX755 7
SECTION 1 - FEATURES AND OVERVIEW
3D IR EMITTER BOARD
Designated as the HEM3 Board, this board is the internal 3D IR Emitter to
synchronize the 3D shutter glasses.
WIRELESS LAN CARD
The wireless transmit/receive circuits are located on this board to
communicate with a wireless network.
SWITCH UNIT
This board contains the power, channel and volume up/down, and menu
buttons.
LCD PANEL ASSEMBLY
The LCD Panel Assembly includes the LCD Panel, TCON Board, and LED
Backlight system.
The LCD Panel contains the actual liquid crystals, color filters, and
The LCD Panel contains the actual liquid crystals, color filters, and
polarizers. The liquid crystals are manipulated by the applied voltage to
pass a specific amount of light - from the backlite - depending on the level
of voltage applied.
The TCON performs all the control, timing, charge, and discharge functions
The TCON performs all the control, timing, charge, and discharge functions
driving the operation of the LCD Panel.
A new LCD Panel assembly from parts will include the following items.
A new LCD Panel assembly from parts will include the following items.
●
LCD Panel
●
TCON Board
●
LED Backlighting Components (varies)
TCON BOARD
The TCON Board communicates between the LCD Panel and the
microprocessor on the Main Board.
NOTE: The TCON Board is not available as a replacement part for all
NOTE: The TCON Board is not available as a replacement part for all
models. To determine if the TCON Board is available as a replacement
part, refer to the LCD Panels Manual.
KDL-40HX755/46HX755/55HX755 8
OVERVIEW
This chapter provides information regarding the Self Diagnosis feature in
our TVs.
UPDATING THE SOFTWARE
The Self Diagnosis function is designed to provide information regarding
the problem with the TV, however, there are several issues that may be
resolved by updating the TV software to the latest version. Always check
the Sony site for any issues that are software related. Most symptoms that
are correctable by software updates involve communications issues with
other devices or minor glitches in the operation of a specific function. Below
is a list of some of the symptoms that may be corrected with a software
update:
●
Fluctuations in picture brightness
●
Intermittent picture freezing or noise
●
Problems with certain inputs (especially HDMI)
●
Intermittent or distorted audio
●
Erratic remote control operation
●
TV turns on and off by itself
●
Loss of color
●
Internet connectivity
●
Certain features not working correctly
(photo or video file viewing)
SECTION 2 - TROUBLESHOOTING
Self Diagnosis
Supported model
SELF DIAGNOSIS FUNCTION
Critical voltages and circuit operations are monitored by the CPU on the
Main Board. If an error is detected the Self Diagnosis function in the TV will
force the TV to shut down by the CPU. The monitored circuit in which the
fault occurred will automatically cause the CPU to blink the Standby LED
in groups of repeating sequences. The number of times the Standby LED
blinks indicates the possible cause of the problem.
Not all of the available protect codes are used in every model. For example,
Not all of the available protect codes are used in every model. For example,
models that don’t have the local dimming feature do not use the 4X blink
error as this circuit is found in models that are backlit with fluorescent lamps.
The information in this section provides guidance in locating the possible
component causing the shutdown.
STANDBY LED BLINK COUNT
Standby LED
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
LED DISPLAY & BLINK COUNT
KDL-40HX755/46HX755/55HX755 9
SECTION 2 - TROUBLESHOOTING
VIEWING THE SELF CHECK DIAGNOSIS HISTORY
When an error is detected, the Self Check screen records the date(s) and
the number of times the error occurred. This is helpful in confirming past
occurrences of an error, and for determining if an error is intermittent when
the customer is not sure what is causing the television to shut down. If the
screen displays a “0”, no error has occurred.
1. Take the TV out of deep Standby mode by pressing
POWER
to
turn on the TV.
2. Press
POWER
to turn the TV back off.
3. Press the following buttons on the Remote Commander within a
second of each other:
DISPLAY
Channel
5
Volume
-
POWER
* NOTE: This differs from accessing Service Adjustments Mode
(Volume +)
SELF CHECK
000 RESERVED
--------------------- --------------------- --------------------- 00
000 RESERVED
--------------------- --------------------- --------------------- 00
002 MAIN_POWE --------------------- --------------------- --------------------- 00
003 DC_ALERT
003 DC_ALERT
--------------------- --------------------- --------------------- 00
003 AUD_PROT
--------------------- --------------------- --------------------- 00
003 HDMI_EQ
--------------------- --------------------- --------------------- 00
003 TU_DEMOD --------------------- --------------------- --------------------- 00
004 VLED
004 VLED
--------------------- --------------------- --------------------- 00
004 LD_ERR
--------------------- --------------------- --------------------- 00
005 HFR_ERR
--------------------- --------------------- --------------------- 00
005 TCON_ERR
120123132522 120123113645 --------------------- 02
005 P_ID-ERR
--------------------- --------------------- --------------------- 00
006 BACKLITE
--------------------- --------------------- --------------------- 00
007 TEMP_ERR
--------------------- --------------------- --------------------- 00
007 FAN_ERR
--------------------- --------------------- --------------------- 00
010 EMITTER
--------------------- --------------------- --------------------- 00
101 VPC_WDT
--------------------- --------------------- --------------------- 00
102 MEPS_WDT --------------------- --------------------- --------------------- 00
103 HOST_WDT --------------------- --------------------- --------------------- 00
104 STBY_WDT
103 HOST_WDT --------------------- --------------------- --------------------- 00
104 STBY_WDT
--------------------- --------------------- --------------------- 00
00345 000333 06789
Total operation time by hour (MAX:65535)
Boot count (MAX:65535)
Panel operation time by hour (MAX:65535)
Total operation time by hour (MAX:65535)
Boot count (MAX:65535)
Panel operation time by hour (MAX:65535)
StandBy LED
Blink Count
Diagnosis
Item
Date and Time Display*
Error Count
(00-99)
*Format of Error History = YYMMDDhhmmss example 120123132522= Jan 23, 2012 13:25:22 (1:25:22PM)
NOTE: date and time must be set for this to work
SAMPLE SELF CHECK DIAGNOSIS PAGE
KDL-40HX755/46HX755/55HX755 10
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
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
A failure of the infrared sync transmitter circuits on the HEM3 board will
cause a 10X error and replacement of this board will usually rectify the
problem. In rare cases, the Main Board could be the source of the failure.
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