DOWNLOAD Sony KDL-40NX725 Service Manual ↓ Size: 6.56 MB | Pages: 61 in PDF or view online for FREE

Model
KDL-40NX725
Pages
61
Size
6.56 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kdl-40nx725.pdf
Date

Sony KDL-40NX725 Service Manual ▷ View online

KDL-40NX725 20
SECTION 3 - CHASSIS OVERVIEW
POWER SUPPLY
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:
 
● G4 (40”)
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.
Converter: Generates the B+ for the local dimming (LD board) 
circuits to control the backlighting level.
POWER SUPPLY FOR BACKLIGHT SYSTEM
Power for the LED backlights is provided for the LD board via the 
G4.
LD BOARD (LOCAL DIMMING)
The LD Driver Board is controlled by the TCON/HFR Board to perform 
overall backlight power-on, backlight level, and local dimming 
functions. This board takes the 24V from the Power Supply Board 
and develops the negative and positive voltages to directly drive 
the LEDs in the panel assembly. The negative voltage rail is pulse 
width modulated to control the on time of the LED backlights. LED 
backlight brightness is controlled in 4 separate groups (quadrants).
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. 
USB CAMERA
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.
KDL-40NX725 21
SECTION 3 - CHASSIS OVERVIEW
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.
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.
A new LCD Panel assembly from parts will include the following 
items.
1.  LCD Panel
2.  LED Backlighting Components (varies)
3.  TCON Board
TCON BOARD
The TCON Board communicates between the LCD Panel and the 
microprocessor on the Main Board. The TCON performs all the 
control, timing, charge, and discharge functions driving the operation 
of the LCD Panel.
(NOTE: The TCON Board is not available as a replacement part for 
all models.)
KDL-40NX725  
22
SECTION 3 - CHASSIS OVERVIEW
POWER SUPPLY/
CONVERTER
VIDEO 1 CVBS
RF
VIDEO 2 CVBS/COMP
HDMI 1
PC HD15
SWITCH
UNIT
LED
IR RX
LIGHT SENSE
LCD PANEL
HFR
TCON
BATL
HLT2
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
G4
IR
TRANSMITTER
HEM2
LOGO
LED
WIRELESS 
LAN CARD
IC9000
A/V 
DECODER
VIDEO 
PROCESS
USB2.0
USB HUB
LED DRIVE
LD
USB 
CAMERA
FIGURE 3-4.  OVERALL BLOCK DIAGRAM
DIAGRAMS
BLOCK DIAGRAMS
KDL-40NX725  
23
SECTION 3 - CHASSIS OVERVIEW
48M
32.76
8K
[PST3629]
GND
Push
P
A
N
E
L
[LM75B]
DDR3
–1333
2Gb
DDR3
–1333
2Gb
One–
NAND
Muxed
2Gb
[RTL8201E]
[TPS2553DBV]
[GL850G]
12M
[TPS2553DBV]
H/L
[D–510D]
[D–510D]
[NJU72040V]
41M
[LNBH23]
[MIC2005]
[SEKITO2]
[GAIA1a]
41M
[HORUS3]
27M
4M
[ASCOT2Sip]
[Sil9287B]
0
0
XReality
HDMI1
(ARC)
HDMI2
HDMI3
Aerial
Cable
Satellite
PC
PC
COMP
CVBS
SPDIF
Main
SPEAKER
HP/Line
 Out
Assist
SPEAKER
Analog Video
Digital Video/TS/TMDS
 
Analog Audio
Analog Signal
PWM
I2C
SPI
X_SYSTEM1_RST
AUDIO_MON
X_FAULT
Main Speaker_Out_LR
X_SYSTEM1_RST
Assist Speaker_Out
SPDIF
HP/Line Out LR
HP_/ Line Out Det
PC_5V, PC_DDC
PC_LR
PC_R,PC_G,PC_B,PC_H,PC_V
PC_CON_Det
Cr_Det
ASPECT1
COMP_Y, Pb, Pr
VideoB_Det
COMP2_LR
VideoA_Det
VIDEO_CV
VIDEO1_LR
CEC3
DDC4
HPD4
CEC4
DDC_5V_4
TMDS4
CEC2
DDC3
HPD3
DDC_5V_3
TMDS3
CEC1
TMDS2
DDC2
HPD2
DDC_5V_2
ARC
TMDS1
DDC1
HPD1
DDC_5V_1
EQ SW
3.3->1
I2CA
X_SYSTEM1_RST
TCON
Reset
Ether
PHY
X’tal
Temp
Sensor
Audio
Power AMP
HDMI4
Ether
KEY
LED
TMDS
DDC
CEC
Line Out_LR
Power_Control
MAIN_PWR
Power_KEY
KEY
Light_Sensor_Det
STBY_LED
POWER_LED
TL-JIG
UARTA(LOG)
Hote
l
UARTC(Hotel/ECS)
BACKLIGHT_ON
DIMMER
BACKLIGHT_MON
SYSTEM2_PWR
Human Sensor
Human_Sensor_Det
X_AUDIO_MUTE1
PFC_PWR
OPAMP
AC_MON
I2CA
X’tal
DIMMER_DC
USB2
Current 
Limit
USB1
USB 
HUB
X’tal
Power
Tuner_LR
Current 
Limit
USB3
Wifi
USB4
BD
AC_M
ON
PFC_MON
POWER_KEY
POWER_LE
D
REC_LE
D
X_SYSTEM1_RS
T
DIMMER
DC_MON
KEY
Light_Sensor_Det
UARTA (LOG)
PFC_PW
R
DEBUG_LED1
Human_Sensor_Det
LVDS
PEL3
UARTD
PANEL_SE
L
5V
Aerial
Ext Demod
X’tal
LNA
Ext Demod
IFAGC
DDC
I2CB
I2CB
Satellite
Silicon 
Tuner
X’tal
Silicon 
Tuner
Zero-IF
IF1
X’tal
DiSEqC_Out
IFAGC
IF2
DiSEqC_In
27MHz
SW
COMP_Y
COMP_Pb
COMP_Pr
PC_G
PC_B
PC_R
PC_H
PC_V
PC_LR
VIDEO1_LR
COMP2_LR
Tuner_LR
VIDEO_CV
COMP_Y
S1.8V
LDO
3.3V
LDO
DDC
5V
STBY 3.3V
2.5V
LDO
TCON-ON
SYSTEM2_PWR
DDC
REG_12V
T-CON_VCC
REG12V
AUDIO_12V
REG_12V
BACKLIGHT_MO
N
X_AUDIO_MUTE
1
X_AUDIO_MUTE
2
PANEL_PWR_Det
5V
UARTE
PC_CON_DET
Crystal
VIDEOA_DE
T
VIDEOB_DET
CR_D
ET
TIMER_LED
PIC_MUTE_LED
REC_LED
Temp Sensor
X_Hotel_PWR_CTRL
Current 
Limit
5V
I2CA (EQSW, Temp Sensor, Hotel Clock)
I2CB (Ext Demod)
LOGO
DMD_RST
X_AUDIO_MON
STBY_LE
D
TIMER_LE
D
MAIN_PWR
MAIN_SS_MO
N
DIMMER_DC
TS2
TS1
LNA
/ECS
Light Sensor
X_TCON_RST
SA_MOD
E
BINT
TCON_RDY
IF1
Main Speaker_Out_LR
S1.2V
LDO
PEM_LOG
I2CA(Hotel_Clock)
DEBUG_LED2
DEBUG_LED3
DMD_CLK_ENABLE1
PANEL_PWR
Atreyu_SPDIF
BACKLIGHT_ON
SYSTEM2_PWR SYSTEM1_PWR
PIC_MUTE_LE
D
1.5V
3.3V
MODE_PEM
I2CC (Panel, RGB Sensor)
DMD_CLK_ENABLE2
HDMIEQ_INT
DMD_RST
DMD_CLK_ENABLE1
DMD_CLK_ENABLE2
X_SYSTEM1_RS
T
X_
SYSTEM1_RS
T
Reset
SIRCS
UARTB (RF-Remote)
UARTC (IR Blaster/ECS)
MS
TS
Panelless
AC_MON
Reset
H Con.
Audio
Power AMP
Assist Speaker_Out_LR
Sircs
SIRCS
AUDIO_12V
REG12V
SYSTEM2_PWR
DDC
1.2V
SYSTEM1_PWR
DDC
REG_12V
3.4V
LDO
SYSTEM2_PWR
X_RF_RST
NM
I
X_HOTEL_PWR_CTRL
DATA
1
HP_DET
X_WIFI_RST
SPDIF_SEL
BACKLIGHT
DIMMER2
LVDS_ODD
LVDS_EVEN
SA_MODE/LUT_SEL0
PEM_WDT/XBUSY/BINT
I2C_
C
MODE_PEM/TCON_RDY
LUT_SEL1/X_TCON_RST/LR_FLA
G
T_PANEL_SEL
Digital Audio
UART
REG_12V
FIGURE 3-5.  ENGINEERING BLOCK DIAGRAM
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