Friday, February 12, 2016

SONY LED TV - XBR-55HX920 - Software error symptoms - Led blinking troubleshooting - Factory reset - Circuits board and working - LED Television Repair and service

Category: LED Television Repair and Service 

Contents of this article 

  • Faults because of software error 
  • Power LED Blinking and faults
  • How to access service mode
  • Resting the TV to factory default

SONY XBR-55HX920

EXAMPLES OF SOFTWARE CORRECTABLE SYMPTOMS
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
# Unit turns on and off by itself
# Loss of color
# Internet connectivity
# Certain features not working correctly 
POWER LED BLINKING AND TROUBLESHOOTING
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.
VIEWING THE SELF CHECK DIAGNOSTIC HISTORY
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
CLEARING THE SELF CHECK DIAGNOSTIC LIST
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 .
RESETTING THE LCD PANEL OPERATING HOURS
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 .
EXITING THE SELF CHECK DIAGNOSTIC SCREEN
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.
ACCESSING SERVICE ADJUSTMENT MODE
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,
DIGITAL, CHASSIS, and VPC. If the DIGITAL Service
Menu is not displayed, press JUMP or OPTIONS on the Remote Commander.
VIEWING OR CHANGING SERVICE DATA
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 2 to move to the Next Category or press 5 to go back to the Previous Category.
Note: Pressing 2 or 5 only changes the Categories within the Service Menu displayed.
5. To change the adjustment item, press 1 to move to the Next Item or 4 to go back to the Previous Item.
6. To change the Data Value, press 3 to increase the Data Value or 6 to decrease the Data Value.
4. Press MUTING then press 0 to WRITE (Save) the changes.
5. To exit service mode, press HOME or turn the TV power off.
VERIFYING SERVICE ADJUSTMENTS
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
VERIFYING THE SEGMENT CODE
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 2 to move to the 002 MODEL category.
4. Using the bellow value, press 3 to increase the data value or 6 to decrease the data value, to select the correct segment code data value
Code Name 
2b
1
Segment Code
Y4
5. Proceed to “Verifying the Destination”.
VERIFYING THE DESTINATION
The correct model may need to be selected after updating the software.
6. Press 1 to move to the 001 DEST item.
7. Using the table, press 3 to increase the data value or 6 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”.
VERIFYING THE MODEL NAME
The correct model may need to be selected after updating the software.
9. Press 1 to move to the 002 MODEL item.
10. If the correct model does not display, press 3 until the model displayed matches the model of the TV.
11. Press MUTING then press 0 to WRITE (Save) the changes.
12. To exit service mode, press HOME or turn the TV power off.
OPTIONAL ADJUSTMENTS
All Sony TVs are set for optimal viewing performance. Refer to the following instructions if the customer requests additional adjustments.
SETTING WHITE BALANCE 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 2 to move to “006 WB” Category.
5. To change the data value of the R_DRV, press 3 to increase the value or 6 to decrease the value.
NOTE: The data value must be set between the range 1 to 255.
6. Press 1 to move to the next item (001 G_DRV).
7. To change the data value, press 3 to increase the value or 6 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 0 .
10. To exit service mode, press HOME or turn the TV power off.
RESETTING THE TV TO FACTORY CONDITION
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.

RESETTING THE TV TO FACTORY CONDITION USING SERVICE MODE
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. 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 0 .
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.
CIRCUIT BOARDS AND WORKING 
MAIN BOARD
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.
TUNER
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).
X-REALITY PROCESSOR
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
AUDIO AMPLIFIER
The audio amplifier (IC4601) amplifies the digital audio output of the X-Reality processor and sends it to the speakers.
TEMPERATURE SENSOR
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.
POWER SUPPLY
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 SUPPLY FOR BACKLIGHT SYSTEM
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.
3D IR EMITTER
Designated as the HEM2 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.
CAMERA MODULE
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.
IR BOARD
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.
LCD PANEL ASSEMBLY
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)
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 )