SONY XBR-55HX929 - Troubleshooting power LED blinking problems - Tcon Error - factory service mode - factory reset - boards and working - LED Television repair and service

Category: LED Television Repair and Service 

Contents of this article 

  • Power LED Blinking and faults
  • How to access service mode
  • Resting the TV to factory default 
  • Chassis overview


2 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
The Audio error can occur due on of the following error conditions.
Defective DC Regulator on Main Board
Defective Audio Amplifier (Main Board)
Loss of AU12V (Open F4200 on Main Board)
Loss of AU12V (Open Fuse on Power Supply Board)
In most cases, replacement of the main board will remedy a 3X error.
4 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 or one of the LED’s fails in the panel the TV will shut down and display this diagnostic code. Models using conventional non-local dimming LED backlighting do not utilize this error code.
5 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.
6 Blink - Converter System Failure
If the converter circuit (located on the power supply or separate converter board) fails to start or shuts down due to an over-voltage or over-current condition, the TV will shut down and generate a 6X error code. The diagnostic page labels this as a “Backlight Failure” even though the backlights are not the source of the problem. Replacement of the G5 Board (46”) or G7 Board (55”) should rectify this problem.
7 Blink – Temperature Error
If the temperature inside the television becomes excessive, the temperature sensor (located on the Main Board) notifies the unit to shut down and display a 7X error. Excessive temperature errors will always occur when the unit 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 temperature sensing IC or failure of the communications bus between the IC and the microprocessor. Replacement of the main board is necessary.
10 Blink – IR Sync Transmitter Failure
A failure of the infrared sync transmitter circuits on the HEM2 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.
It is possible to bring up past occurrences of a failure for confirmation on the Self Check diagnostic history screen. This feature is useful for failures which are intermittent or when the customer is not sure what is causing the television to shut down.
1. TV must be in standby mode. (Power off).
2. Press the following buttons on the Remote Commander within a second of each other:
3. DISPLAY > Channel 5 > Volume - > POWER
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen after you have completed the repairs to be sure you have cleared the result display to “0”.
1. To clear the Error history and Error count press 8 0 .
The 3 sets of numbers displayed on the lower left corner of the screen indicates the total accumulated operating hours of the television and the operating hours of the LCD panel. Total operating hours is on the left, boot count in the center and panel hours in the right group (The center numbers are not used.)
1. To clear the LCD Panel operating hours of the LCD Panel after replacing the panel, press 7 > 0 .
1. To exit the Self TCON tconDiagnostic screen, turn off the power to the TV by pressing the POWER button on the remote or the POWER button on the TV.
1. TV must be in standby mode. (Power off).
2. Access Service Mode by pressing the following buttons on the Remote Commander within a second of each other:
DISPLAY > Channel 5 > Volume + > POWER
3. The DIGITAL Service Menu displays.
NOTE: There are 3 Service Menus for this model,
Menu is not displayed, press JUMP or OPTIONS on the Remote Commander.
Within each Service Menu are Categories and data information.
Use the buttons on the Remote Commander to review or change the service data.
4. To change the Category, press to move to the Next Category or press to go back to the Previous Category.
Note: Pressing or only changes the Categories within the Service Menu displayed.
5. To change the adjustment item, press to move to the Next Item or to go back to the Previous Item.
6. To change the Data Value, press to increase the Data Value or to decrease the Data Value.
4. Press MUTING then press to WRITE (Save) the changes.
5. To exit service mode, press HOME or turn the TV power off.
The following procedures should be performed after updating the
software to ensure that the service adjustment data is accurate.
# Verify the Segment Code
# Verify the Destination
# Verify the Model Name
After updating the software, go into Service Mode to verify the Segment Code data value is set.
CAUTION: Selecting the incorrect destination may requiring replacing the Main Board.
1. TV must be in standby mode. (Power off).
2. Access Service Mode by pressing the following buttons on the Remote Commander within a second of each other:
DISPLAY > Channel 5 > Volume + > POWER
3. Press to move to the 002 MODEL category.
4. Using the bellow value, press to increase the data value or to decrease the data value, to select the correct segment code data value
Code Name 
Segment Code
5. Proceed to “Verifying the Destination”.
The correct model may need to be selected after updating the software.
6. Press to move to the 001 DEST item.
7. Using the table, press to increase the data value or to decrease the data value, to select the correct destination of the TV.
CAUTION: Verify the DESTINATION is set correctly before proceeding to the next step. If another destination Data Value is selected, it may possibly corrupt the software which would require a Main Board replacement.
8. Proceed to “Verifying the Model Name”.
The correct model may need to be selected after updating the software.
9. Press to move to the 002 MODEL item.
10. If the correct model does not display, press until the model displayed matches the model of the TV.
11. Press MUTING then press to WRITE (Save) the changes.
12. To exit service mode, press HOME or turn the TV power off.
All Sony TVs are set for optimal viewing performance. Refer to the following instructions if the customer requests additional adjustments.
White Balance adjustment data is located on the Digital Service Menu.
1. TV must be in standby Mode. (POWER off).
2. Press the following buttons on the Remote Commander within a second of each other:
DISPLAY > Channel 5 > Volume + > POWER
3. Press JUMP or OPTIONS on the Remote Commander until the VPC menu displays.
4. Press to move to “006 WB” Category.
5. To change the data value of the R_DRV, press to increase the value or to decrease the value.
NOTE: The data value must be set between the range 1 to 255.
6. Press to move to the next item (001 G_DRV).
7. To change the data value, press to increase the value or to decrease the value.
8. Repeat steps 6 and 7 for each of the following items:
002 B_DRV
003 R_BKG
004 G_BKG
005 B_BKG
9. To save the changes, press MUTING then press .
10. To exit service mode, press HOME or turn the TV power off.
Use the following instructions to restore the User Adjustments and Channel Memory settings to the preset factory conditions.
1. While holding down the UP ARROW BUTTON on the Remote Commander, press the POWER button on the TV Switch Unit of the set.
2. The set restarts and displays the Initial Setup screen. This may take several minutes.

1. TV must be in standby Mode. (POWER off).
2. Press the following buttons on the Remote Commander within a second of each other:
DISPLAY Channel Volume + POWER .
3. If necessary, press JUMP or OPTIONS to go to DIGITAL mode.
4. Press 8.
“SERVICE” changes to green RST.
5. Press MUTING .
RST executes the command and displays EXE.
6. Press .
EXE-RST displays green, then red indicating the TV is writing the data.
When the process is complete the green SERVICE text displays and the LED
7. Cycle AC Power (Unplug and Plug AC Cord from the AC Outlet).
The set restarts and displays the Initial Setup screen. This may take several minutes.
Common to all models the Main Board, designated as the BATL Board, contains the TV control, video, and audio processing circuitry. All these functions are accomplished using the X-Reality Processor IC9000.
The tuner is a combination ATSC/NTSC unit. It can receive traditional analog NTSC signals via cable or terrestrial along with ATSC digital signals via terrestrial (8VSB) or cable (64 or 256 QAM).
IC9000 performs the majority of the necessary audio and video processing on the main board.
TV Microprocessor: The CPU internal to the X-Reality processor controls all aspects of the television functions. Input from the user along with monitoring of critical circuits is also performed by this CPU.
Digital Audio and Video Decoder: The MPEG2 and Digital Dolby audio streams are received from the tuner for decompression. All video sources which are not native 1920 X 1080p 60HZ are scaled to this resolution. Digital audio content is output to the class D amplifier for processing and amplification.
HDMI Input and Switching: HDMI inputs are switched through IC5500. Each HDMI input contains a common EDID NVM (internal to IC5500) to provide display information data to any device connected via the HDMI inputs.
LVDS TransmitterIntegrated into IC9000 is a Low Voltage Differential Signaling (LVDS) transmitter. This circuit converts the 8-bit parallel RGB video information into a set of high speed serial lines for noise-free transmission to the TCON circuits located internally to the LCD panel.
Scan ConverterSignal processing circuit that performs resolution conversion (aspect ratio) and interlaced to progressive scan (IP) conversion
The audio amplifier (IC4601) amplifies the digital audio output of the X-Reality processor and sends it to the speakers.
The temperature sensor detects over-temperature conditions on the Main Board, LCD Panel, or ambient room temperature and sends the shutdown signal to the processor.
There are different Power Supply Boards used in the models.The type of board depends on the size of LCD panel. They are:
# G5 (46”)
# G6 (55”)
# G7 (55”
Note: The G7 Board is used exclusively in the 55” models and is a converter circuit dedicated to providing B+ for the LD (LED Drive) board to control the groups of LED backlighting.
There are 3 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power is applied, the standby supply generates 3.3V for the circuits requiring power while the unit is turned off. An unregulated 19V line is present to provide power to the main relay, PFC and main power supply at turn-on.
Main Supply: Once the power supply receives a power-on command from the CPU on the Main Board, the main switching supply is turned on to provide a regulated 12V source and an regulated 24V source for the LED power supply circuits.
ConverterThe converter circuit residing on the G5 Board generates the B+ for the local dimming (LD board) circuits to control the individual backlight LED groups. The G6 Board does not contain an integrated converter. It supplies PFC 395VDC to the G7 board where a dedicated converter generates the B+ for the LD Board..
Power for the LED backlights is provided via the G5 (46”). The 55” models utilize a separate converter circuit G7 due to the increased current requirements of the larger panel.
Designated as the HEM2 Board, this board is the internal 3D IR Emitter to synchronize the 3D shutter glasses..
The wireless transmit/receive circuits are located on this board to communicate with a wireless network.
This board contains the power, channel, and volume up/down and menu buttons.
A USB camera is located on the front bezel below the Sony logo. Special software is located inside IC9000 to use the camera for power and picture control management. Face recognition software can determine whether someone is viewing the television. The number of people, distance from the TV, location from center, and whether the person(s) are looking at the television provides data to control the picture brightness and contrast. A lack of face recognition (no one viewing the television) can also be used to turn off the backlights, and, eventually turn the TV off for power savings.
Designated as the HLT2 Board, the IR Board contains the power, standby, and timer LED’s are located on this board along with the IR remote receiver and light level sensor.
The LCD Panel Assembly includes the LCD Panel, TCON Board, and LED Backlight system.
NOTE: The LD Board is not always included with the LCD Panel. Check with the LCD Panel manual for the most update information regarding this information.
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 backlight- depending on the level of voltage applied.
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.
1. LCD Panel
2. LED Backlighting Components (varies)
3. TCON Board
4. LD Board (for some models)
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 )