Sony KDL-26EX555 / KDL-32EX555 Service Manual ▷ View online
KDL-26EX555/32EX555 4
SECTION 1 - FEATURES AND OVERVIEW
OVERALL CIRCUIT DESCRIPTION
“Block Diagram” on page 10
provides an overview of the AZ3G chassis.
The following are descriptions of the boards and their functions.
MAIN BOARD
Common to all models the Main Board designated as the BACS Board for
26” models and BAPS Board for 32” models, 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
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
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: The customer can select the HDMI1, HDMI2,
HDMI Input and Switching: The customer can select the HDMI1, HDMI2,
HDMI3, HDMI4 input via the HDMI switch IC5500. Each HDMI input contains
a common EDI NVM (internal to IC5500) to provide display information data
to any device connected via the HDMI inputs.
LVDS Transmitter: Integrated into IC9000 is a Low Voltage Differential
LVDS Transmitter: Integrated 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 Board circuits located internally to the LCD Panel.
Scan Converter: Signal processing circuit that performs resolution
conversion (aspect ratio) and interlaced to progressive scan (IP)
conversion.
AUDIO AMPLIFIER
The main speaker audio amplifier (IC4601) and sub-woofer amplifier
(IC4701) 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 BOARD
There are different Power Supply Boards used in the models in this
manual. The type of board depends on the size of LCD panel. They are:
●
GL3 Board (for 26” models)
●
GL2 Board (for 32” models)
There are 3 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power is
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
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 Audio 12V.
Converter: Generates the B+ and B- voltages for the LED backlights.
Converter: Generates the B+ and B- voltages for the LED backlights.
IR BOARD
Designated as the HL Board, the IR Board contains the power, standby,
and timer LED’s that are located on this board along with the IR remote
receiver and light level sensor.
KDL-26EX555/32EX555 5
SECTION 1 - FEATURES AND OVERVIEW
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-26EX555/32EX555 6
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-26EX555/32EX555 7
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
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