Maintenance spare part list …………………………………………………108
10.
11. Trouble shooting ……………………………………………………………117
Note:Disassembly Instructions
1. Preparation before maintenance: Common contents, it mainly expresses the information
which need your attention, including the Safety instruction and the Protect measure..
2. Electric connection chart: Identify the plug specification and the connection between the
pins and the board by the unit of PCB.
Block diagram of electric: Show the signal processing of the unit in the unit of 1C or
3.
circuit.
4.
Schematic Diagrams: Provide the circuit chart in the unit of PCB and provide the
detailed principle chart with the simple signal processing and control instruction.
5.
Software version view and upgrade instruction: The method of software
version view and the software upgrade instruction.
Maintenance spare part list: Including the Package, Accessory, PCB,
6.
Connector, etc. and the material list that the service person can replace
themselves.
Page 3
1、Preparation before maintenance
1
1.1、Master basic information.
Adequate communication with customers is required, to learn how the
trouble happens and what the status is. This will help to promote effect and
efficiency of the service.
Learn if the trouble has conflict with technical standards.
1.2、Reappearance of the trouble.
Please assure:
a. If the trouble exists as the customer described, and make initial judgment
of the status, then decide what to do next;
b. If any other trouble exists;
c. May reset the machine under some instances. For example: when
the picture and color could not satisfy the customer, could reset the machine
first and then make amendment. Method: Press the “source”button for about
five seconds, the” Factory setting” will be displayed, select the" factory reset”
and enter, then select the" All Setting( Not include calibration)”and enter.
d. Avoid the worse of trouble during the repair.
1.3、 Judgment and Repair
Judge the status of the trouble and find the reason, then repair.
Please cut off the power before disassemble and welding.
Read the manual carefully tolearn security attentions.
Please obey the requirement of Disassemble drawing and description strictly ,
use specified screw,take care not to make any scars on the machine especially on the
LCD. Please wear anti-electrostatic gloves when welding. Please review the status
of power, crystal, clock, input and output data. Please read Spare part list if need any
change.
Check the packing material and accessories when change the machine for the
customer.
Unit Dimension(Without stand)
670(H) × 950(W) ×105(D)mm
Unit dimension:
730(H) × 950(W)× 340(D) mm
Gross Weight: 32kg
Net Weight:
25.5kg
Lamp Life: >=60000H
Unit Dimension(Without stand)
:
768(H) ×1067(W) ×119(D)mm
Unit dimension:
823(H) × 1067(W) × 340(D) mm
Gross Weight: 36kg
Net Weight:
29.5kg
:
Size
Weight
Lamp Life: >=60000H
Unit dimension(Without stand):
512(H) ×699(W) ×98(D)mm
Unit dimension:
552(H) ×699(W) × 295(D) mm
Gross Weight: 17kg
Net Weight: 1
3.5kg
Lamp Life: >=60000H
Unit dimension(Without stand):
586(H) ×825(W) ×102(D)mm
Unit dimension:
636(H) ×825(W) × 295(D) mm
Gross Weight: 23.5kg
Net Weight:
18.5kg
NOTE: Specifications subject to change withoutnotice. Weight and dimensions are approximate.prior
Page 5
T
osideboard
T
oloudspeakers
J
V10310
pin
p
T
o tuner
p
p
J9
J716
J704
p
p
J705
J707
J
701
p
J911
J401
3
INVERTER BOARD
JV601
JV106
16pin
4pin
6pin
J5
8pin
J1
connection chart for LC32T1E and LC37T1E
JV104 4pin updata for TV
5pin to IR
board
JV102
30
JV403
8pin to key
board
JV404
I/O BOARD
JV109
10
in
JV402 5pin
Updata for
MCU
JV101
30
10pin
J2
POWER BOARD
13
in
JF6
3
in
J12
3.1、The electric connection chart
in
BOARD
HDMI
updata for
TV
4pin
5
in
in
J403
SCALER BOARD
To panel
JF603
use in LC37T1E not use
in LC32T1E
This connect cable only
Page 6
T
os
ide board
T
oloudspeakers
J
V10310
pin
p
T
o tuner
p
p
J9
J716
J704
p
p
J705
J707
J
701
p
J911
J401
4
INVERTER BOARD
JV601
JV106
16pin
4pin
6pin
J5
8pin
J1
8pin to key
5pin to IR
connection chart for LC42T1E
board
JV403
board
JV404
3.2、The electric connection chart
POWER BOARD
I/O BOARD
JV109
10
JV104 4pin updata for TV
30
JV102
30
MCU
JV101
in
JV402 5pin
Updata for
13
in
JF6
3
in
8pin
J12
J4
in
BOARD
updata
for TV
HDMI
4pin
5
in
in
J403
SCALER BOARD
To INVERTER
To panel
JF604
Page 7
BOARD
5
IR
16pin
J101
S-I/O
INVERTER BOARD
5pin
J8
16pin
J12
POWER
JF1
2pin
J33
connection chart for LC26T1E
To right speaker
I/O BOARD
BOARD
TUNER
For TV updata
J31 4pin
30pin
J14
For updata MCU
5pin
30pin
8pin
J13
J22
J6
2pin
J32
To left speaker
J5
12pin
J9 10pin
BOARD
KEY
JF4
12pin
3.3 The electric connection chart
POWER BOARD
JF5
JF6
SCALAR BOARD
J706
J705
J704
To panel
JF603
Board
HDMI
J403
5pin
For TV updata
4pin
J701
J401
50pin
30pin
Page 8
4.1.1、The block diagram of POWER
6
LINE FILTER
AC
INPUT(90V~264V)
(USE FOR LC32T1E/LC37T1E/LC42T1E)
U1 ML4800 for
PWM
U3
FS7M0880
U2
FSD200
T11
T12
T4
+24V
-12V
+12V
+3.3V
+21V
+5V
5V_MUTE
5VS
Page 9
、
7
(USE FOR LC26T1E)
LINE FILTER
AC
INPUT(90~264V)
U3
FS7M0880
U1
ML4800
U2
FSD200
T5
T6
+24V
-12V
+12V
+5V
+18V
+3.3V
S+5V
T4
Page 10
Form tuner
r
9
V
60
8
SCART1 OUT
UV104 filter
circuit
Form JR2
AV-CVBS
SCART2-Y/C
TV-CVBS
SCART2-CVBS
Form JR1
SCART1-CVBS
S1-Y/C
U11、U12
DDR×2
JV108
DRAM
Audio/Video Switch
Form
7--Input 3--Output
SCART1-RGB
Y/C
YPbP
Analog interface
PW106
U9
CX2069Q
UV401
AV-CVBS
I/O board
SCART2 OUT
Digital interface
VGA-RGB
PI5V330Q
U1
RGB
S-RGB
AD9885
U6
4.2、The block diagram of video
(USE FOR LC32T1E/LC37T1E/LC42T1E)
HDMI
signal
Microcontroller
and Flash
FLASH
2
L
U13
Group
PLL
1
LVDS OUTPUT
27M
LCM
Page 11
HDMI board
p
p
p
r
p
r
9
Form SCART1
Form JR2
Form SCART2
Form MIC2
Form JR2
WM8761
U5
HDMI board
HDMI-Audio
YPbPr-Audio
S1-Audio
Switch
the input sound
volume; switch select of
Audio/Video
decoder; control of
S2-Audio
7-Input 3-Output
CX2069Q
AV-Audio
Processor. Audio
Digital TV Sound
VGA-Audio
AV-Audio
I/O board
TDA9875
UV401
SIF
UV505(I/O board)
4.3、The block diagram of audio
Form TUNER
(USE FOR LC32T1E/LC37T1E/LC42T1E)
SPDIF
UV601 NJW1137
UV103
74HC04
HDMI-Audio
OUTPUT
UV506 T wo step
filter circuit
AV OUTPUT
UV504 T wo step
filter circuit
AV OUTPUT
filter circuit
UV503 T wo step
filter circuit
UV502 T wo step
BBE processor
UV602
TPA3100
ower am
class-D audio
NJM4556
TO UV102
U101
Drive am
lifie
Loudspeakers
TO SCART2
TO SCART1
Earphone
out
lifie
ut
Page 12
、
10
(USE FOR LC26T1E)
J705: From I/O Board
U15
TDA9875AH
Sound Processor
Audio
Signal
J706: From I/O Board
SIF Signal
J704:
From
POWER
Board
I2C
Signal
Panel Control Signal: BKLON and ANAPWM
POWER:
+5V,+3.3V,+12V
COAXIAL
Audio
Signal
U27:
COAXIAL_OUT
Control
Signal
I2S
Audio
Signal
U5
WM8761
Video
and
Audio
Signal
Control
Signal
J401: From HDMI Board
U9
PW106B-10L
ImageProcessor
I2C
Signal
U10
24LC32
EEPROM
LVDS Signal
Power
and
Control
Signal
J403: TO HDMI Board
U11
DDR-SDRAM
128M
U12
DDR-SDRAM
128M
U13
29LV160CTTC-70
Flash ROM
JF603:
To
LCD
Panel
Page 13
、
11
(USE FOR LC26T1E)
J13: From SCALER Board
Interface
J8: From IR
J6: From KEY
J5: From
POWER
Board
J1
Update
RX-8025SA
TIME
CONTROLLER
Board
Board
Update
Control
Signal
Control
U6
IR
Signal
KEY
Signal
STB Signal
VGA: HS and VS
POWER: S+5V,+5V,
+12V,+18V,-12V
MCU
Timer
Control
PIC16F72ISO
I2C
For
U9
MCU
Headphone
Audio
Headphone
U15
NJM4558M
Amplifier
Audio
J12: From Side I/O Board
Audio Output
FB1
ASP1
CVBS
YC
Video
Audio
Signal
ASP2
Scart2
CVBS
YC
Video
Audio
Signal
U16
NJM4558M
Amplifier
J18
SCART2
AV
CVBS
Signal
Output
CVBS
CVBS
Video
Signal
Audio
Output
Signal
SCART1
RGB
Video
Input
SEL
I2C
Control
For
Switch
U7
CXA2069Q
A/V
SIGNAL
SWITCH
TV
J17
P15V330Q
Video
Singal Inputl
Audio
CVBS
Signal
Signal
Input
Scart1
Audio Output
J2
RCA
U1
I2C
Control
For
TUNER
J9:
From TUNER
Board
TV
CVBS
Video
Signal
J14: From SCALER Board
YPbPr
Video
Input
YC
SIF
Signal
Scart1
Audio
Signal
YPbPr
Audio
Input
Video Signal
NJM4558M
Amplifier
for VGA
Current
Audio
Signal
U22
J11
VGA
U4
74LVC126A
U18
NJM4558M
Amplifier
Audio
Output
J3
RCA
J16
VGA Audio
VGA: HS and VS
VGA: HS and VS
Main
Audio
Signal
U17
NJM4558M
Amplifier
Main
Audio
Signal
UV9
TPA3100D2
POWER
AMPLIFIER
Main
Audio
Output
J32,J33:
To Speaker
Page 14
5、Work Principle
12
The product mainly handles with video signal, such as RF (cable TV),
CVBS(composite video), S-VIDEO(Y/C signal), YPbPr(progressive video), SCART, DTV
signal, VGA and HDMI, as well as audio signal amplifying output. AV includes S-VIDEO
and CVBS. In addition, it can input VGA and other signals to realize PIP function.
Because the product is comprised of three boards, the work principle will separate
into three parts as follows:
5.1、Work Principle of Power Board
1. When power is supplied, whether the TV is turned on or off is decided by the
voltage of STB pin in the mini MCU PIC16F72, the high voltage means standby, and
the low voltage means turning on.
In the standby state, the winding 5 and winding 7 of transformer T4 will supply
5VS voltage after regulated by D13, then the power is fed back to optical coupling,
After regulated by diode D14.the 5VS becomes steady. The circuit combined with
transformer T4 is a standby circuit, RE1 is off, then the power consumption could
be less then 1W. When STB pin in MCU sends out a low voltage order, the RE1 circuit
will work and the two main circuits output 24V、+/-12V,5V,3.3V.
2. When the RE1 is on, the power (90-264VAC) will be transformed into sine wave
by DB2. The C27 will be charged by D3 at first, not by T3, to avoid the C27 charge
saturation, which may cause hardware damages such as MOS JM1 failure.
At the same time, the pin 2、4 of U1 ML4800 will set up current and voltage
for the multiplication organ inside. Then C25 will be charged by R17 and R18,
supplying the power for the pin 13 (VCC) of U1. The PFC circuit begins to work,
PFC circuit includes pin 1, 2, 3, 4, 15, 16, 12 and correlative circuits, pin 13
of U1 (shares the power supply with PWM), pin 14(7.5V reference voltage), pin
7(brae pulse producing circuit, provides switch frequency), together with JM1,
T3 and D8.
When PFC begins to work, the pin 12 output switch waves, opposite to the half
wave sine waves, so when the voltage is highest, the duty cycle is lowest, when
the voltage is lowest, the duty cycle is highest. When JM1 is on, T3 charges, and
when JM1 is off, the stored energy of T3 is released to C27 by the loop circuit
consist of D8, C27, R81, and R83. In this way, the voltage of C27 is stabilized
to 380VDC. feed back by the 15 pin of U1. R26, R27 and R23 compose the voltage
dividing resistances. After dividing, the voltage of R23 reaches 2.5V.There is
a 2.5V exact voltage source inside the pin 15. Comparing with it, equation means
the voltage reaches 380V steadily. If the voltage of C27 is lower than 380V, then
the voltage of R23 will be lower than 2.5V. Compared with of 2.5V voltage, pin
16 will output high voltage, making the duty cycle of pin 12 higher, then the
energy storage of T3 increases, and voltage of C27 is higher. Contrarily, the
voltage of C27 is lower.
The pin 3 of U1 4800 is the detecting pin for PFC average voltage mode. The
minus voltage peak value on the pin 3 by R81 should not exceed 1V. Otherwise, the
Page 15
current is limited, and the 380V voltage of PFC will descend. Actually, the current
13
is limited when the peak value of this board is 0.7V. The pin 4 is a line voltage
detecting pin. It detects the input AC Voltage, and when the 264V voltage becomes
lower to about 80V, the amplifying ratio of the 4th pin is higher, and the duty
cycle of the pin 12 of FPC is higher, the current to the PFC is higher. So when
the input voltage decreases, the power output to C27 will not change. The pin 2
is power detecting pin. The purpose of this pin is:
1) It tries to make the frequency and phase of PFC switch current envelopment
same with input voltage’s, so the PF is close to 1 and the resonance waves are
smallest;
2) It decreases when the duty cycle of PFC increases, increases when detecting
current decreases.
3. When the TV is turned on and the PFC voltage of C27 reaches 380V 2-3%, the
switching power supply PWM begins to work, pin 5 of 4800 is turned on and begins
to charge, when charges to 0.7V, the PWM circuit begins to work, the duty cycle
of PWM cannot exceed 50% when stimulating positively, therefore the duty cycle
of 4800 is limited to 48%, in order to protect switching power. After this, pin
11 output switch pulse signal, makes the transformer T11 work. After rectificated
by D15, pin 6 and pin 7 of the transformer T11 provide a voltage supply, which
is between 13V and 17.5V. To pin 13 (VCC) of 4800, this positive stimulating
transformer just transform voltage. After rectificated by D16, T8 begins to store
energy, C49 filters and outputs 24V,
The 24V voltage regulation process is: 24V provides 2.5V voltagebyvoltage
division circuit made of R42、R43,then inputs 2.5V to U6, in TVL431, compares
with the internal norm voltage regulation source, when 24V output voltage is low,
U6 pulls down U5light coupling voltage ,which pulls down the voltage of pin 6
in 4,800 accordingly,increases duty cycle of the pin 11(PWM), so the 24V output
power increases, resulting in the rising of 24V. Contrarily, it drops down.
There is another FS7M0880 switching power supply, when PFC voltage 380V rises,
pin 3(VCC) of U3 FS7M0880 begins to charge by R65, when VCC reaches 13 - 16V,
pin 5 electric capacity begins to charge and to work. Pin 5 and pin 6 of T12 output
voltage accordingly, supplies the power for VCC, the T11 output 5V, +/-12V voltage.
This switching power supply is regulated from 5V; the voltage regulation process
is the same with 24V’s.
5.2、Work Principle of SCALER board
1、SCALER board can: process all video signals; provide the display format which
is accordance with PANEL requirement; finish OSD display and menu operation;
communicate with mini MCU on IO board to receive the key signal and handle
correspondingly.
2、 Features of SCALER board:
The core of SCALER board is single chip PW106. After the outer signal enters
PW106, it is all up to this chip to finish the video decoding of all formats and
picture processing, and finally provide the PANEL-required display format and
Page 16
switch into LVDS signal to send it to PANEL for processing.
14
3、flow of main video signal process:
CVBS composite video signal of TUNER (including TUNER signal) and S-VIDEO signal
is output to PW106 of SCALER board via 2069 of IO board.
PW106 handles with the input video signal, such as resolution and field switch,
OSD overlapping, multi-window handling, to switch into PANEL-required resolution.
And LVDS channel transports the picture data to PANEL and finally the correct
picture is displayed on PANEL.
It should be noted that PW106 outputs analog video signal and the main transport
mode is difference transport mode. Therefore, when maintenance, not only‘+’
signal but also ‘-’signal of all video channels should be checked.
4、Flow of audio signal process:
Most of audio signals are processed on I/O board, while SCALER board only
processes the audio signal from HDMI. Because HDMI accepts the HD digital signal
input, its audio input should be digital signal, which is switched into analog audio
signal via WM8761. Then the processed analog audio signal is sent to IO board for
amplifying.
5、Flow of main system program
The loading program of PW106 is saved in the 8M flash chip. If the flash chip
is destroyed, TV can’t be powered on and logo can’t be displayed.
The program upgrading of FLASH can be done via the upgrading port of SCALER
board or IO board, as long as the power supply and FLASH and PW106 are normal.
It has nothing to do with DDR chip.
The running of PW106 depends on two DDR chips. If part of DDR circuit is
abnormal, then TV can be powered on and logo can be displayed, but TV doesn’t accept
any IR order once logo disappears.
6、Some other controls
For LCD PANEL, besidesPW106 transporting LVDS signal to PANEL, it also: 1/.
suppliers power (LVDSVDD)to signal port of PANEL. The voltage is 5V or 12V,
which is up to the PANEL requirement; 2/. Controls the backlight of PANEL:
BKL-ON/OFF,which controls the On/Off of backlight of PANEL(above 1V=On,below
1V=Off),while BRT-ADJ controls the brightness of backlight.
When TV can’t display, it should be checked first if the backlight is on. If the
backlight is on, then check if LVDSVDD has voltage. If no voltage, then it is the
reason that the drive tube of voltage is destroyed. If LVDSVDD is OK, then please
check LVDS cable.
PW106 checks the status of earphone socket. When the earphone is inserted into
the earphone socket, the EAR-INT signal sent to PW106 will be high level. Then ,
PW106 will low down STANDBY signal, which connect the signal of control end of
amplifier chip LX1722. When the STANDBY signal is high level, then amplifier works;
otherwise, the amplifier enters the standby mode.
It should be noted that sometimes if the connector between mini I/O board and IO
board is lax or pulled off, then EAR-INT will be high level and speaker has no
voice output. Therefore, if maintain the TV with no-voice-output speaker, please
Page 17
check if the EAR-INT signal is abnormal, which is in order to avoid wasting time
15
on checking amplifier.
Regarding the connecting with IO board, it is important that I2C signal
connects with MCU (MCU-INT、SCL-MCU、SDA-MCU). If there is any problem with
the connecting, then the key and remote control work out.
5.3、Work Principle of I/O board
1、I/O board mainly: inputs & outputs AV signal, switches audio and video,
amplifies audio, control mini MCU and process key.
2、I/O board can be divided into three modules, a)audio module,to process,
switch and amplify audio;b)video module, to input & output video switch;c)
mini MCU module. When maintenance, if no sound, then the audio module has problem;
if no picture, then the video module has problem; if the remote control and keys
work out, then the MCU module has problem under the circumstance that IR&KEY board
is OK.
a)Audio module:is divided into small signal process and power amplification.
Small signal can be separated into: left & right audio analog signal. Analog audio
signal enters CX2069Q(UV401) via the following 7 channels: left & right audio
channels of AV2(S-VIDEO2), left & right audio signals of SCART1 & SCART2,
left & right signals of YPbPr,left & right signals of VGA,left & right audio
signals of HDMI sent by SCALER board and the audiosignal switched from digital
TUNER. The above audio signals are switched via CXA2069Q,and sent together with
SIF signal from DVB board to TDA9875(UV505) for processing. TDA9875(UV505)
mainly decoding the audio channel of SIF signal and control the volume. After
processed by the chip, 4 routes of L & R signals are output from the output end
of the chip. Amongthem, two routes are output from SCART1 & SCART2 after filtered
by filter web; one is output from earphone after filtered and amplified by NJM4556;
the last one is output by speaker after processed by NJW1137(UV601)and amplified
by TPA3100(UV602).
During the whole process, UV401, UV601 and UV505 are controlled by I2C. If
the audio trouble is caused by UV401 and UV601, connect the signal via lead from
the input end of chip to output end to judge if the work is normal. If the video
trouble is caused by UV401, please judge in the same way. In the whole audio
channel, if audio output is normal, then MUTE signal is low level, otherwise,
high level.
b)Video module:four routes CVBS, one route S-VIDEO, one route RGB signal
and one route TV-CVBS signal. After switched by CXA2069Q(UV401), one route CVBS,
one route S-VIDEO and one route RGB are input to the corresponding analog input
ports of PW106 of SCALER board respectively. In addition, the YPbPr signal of I/O
board input into the corresponding analog input port of PW106. The last route is
VGA and HDMI. HDMI is directly input to the digital port of PW106, and the input
VGA signal is sent to PI5V330Q(U1) and separated into two routes: one is input
from the analog port of PW106, while one is input from the digital port of PW106
after switched by AD9985(U6) into digital signal. In this way, PIP function can
Page 18
be realized by one video IC.
16
c)Mini MCU module:remote and key signals receiving. The remote and key
signal receiving is dependent, but the processing modes in MCU are the same. If
the remote control and key both work out, then judge if the power supply and
peripheral circuit of MCU is normal. If only one works out, check if PIN21 of U202
IR or PIN26-28 has signal input.
• Low power: 200µA startup current, 5.5mA operating
current
• Low total harmonic distortion, high PF
• Reduced ripple current in storage capacitor between PFC
and PWM sections
• Average current, continuous boost leading edge PFC
• PWM configurable for current-mode or voltage mode
operation
• Current fed gain modulator for improved noise immunity
• Overvoltage and brown-out protection, UVLO, and soft
start
Block Diagram
15
2
4
3
7
8
V
FB
2.5V
I
AC
V
RMS
I
SENSE
RAMP 1
RAMP 2
VEAO
VEA
+
MODULATOR
16
GAIN
1.6kΩ
IEA
+
-
1.6kΩ
IEAO
1
POWER FACTOR CORRECTOR
0.5V
+
-
+
-
OSCILLATOR
General Description
The ML4800 is a controller for power factor corrected,
switched mode power supplies. Power Factor Correction
(PFC) allows the use of smaller, lower cost bulk capacitors,
reduces power line loading and stress on the switching FETs,
and results in a power supply that fully complies with
IEC1000-3-2 specification. Intended as a BiCMOS version
of the industry-standard ML4824, the ML4800 includes
circuits for the implementation of leading edge, average
current, “boost” type power factor correction and a trailing
edge, pulse width modulator (PWM). It also includes a
TriFault Detect™ function to help ensure that no unsafe
conditions will result from single component failure in the
PFC. Gate-drivers with 1A capabilities minimize the need
for external driver circuits. Low power requirements improve
efficiency and reduce component costs.
An over-voltage comparator shuts down the PFC section in
theevent of a sudden decrease in load. The PFC section also
includes peak current limiting and input voltage brownout
protection. The PWM section can be operated in current or
voltage mode, at up to 250kHz, and includes an accurate
50% duty cycle limit to prevent transformer saturation.
16VEAOPFC transconductance voltage error amplifier output
PFC AC line reference input to Gain Modulator
Current sense input to the PFC Gain Modulator
PFC Gain Modulator RMS line voltage compensation input
PWM voltage feedback input
it is thePWM modulationramp input.
PWM cycle-by-cyclecurrent limit comparator input
Positive supply
Buffered output for the internal 7.5V reference
PFC transconductance voltage error amplifier input
16
15
14
13
12
11
10
9
C
T
T
VEAO
V
FB
V
REF
V
CC
PFC OUT
PWM OUT
GND
DC I
LIMIT
REV. 1.0.5 9/25/01
Page 96
FS7M0880
94
Fairchild Pow er Switch(FPS)
www.fairchildsemi.com
Features
• Precision Fixed Operating Frequency
• FS7M0880(66kHz)
• Pulse By Pulse Over Current Limiting
• Over Load Protection
• Over Voltage Protection (Min. 25V)
• Internal Thermal Shutdown Function
• Under Voltage Lockout
• Internal High Voltage Sense FET
• Latch Up Mode
•Soft Start
Internal Block Diagram
Description
The Fairchild Power Switch(FPS) product family is specially
designed for an off line SMPS with minimal external
components. The Fairchild Power Switch(FPS) consists of a
high voltage power SenseFET and the current mode PWM controller IC. The PWM controller includes an integrated fixed
oscillator, the under voltage lock out, the leading edge blanking
block, the optimized gate turn-on/turn-off driver, the thermal
shut down protection, the over voltage protection, the temperature compensated precision current sources for loop compensation and an fault protection circuit. Compared to just PWM
controller combined MosFET or R
tion, a Fairchild Power Switch(FPS) can reduce total component price, design size, and weight,also simultaneously increase
efficiency, productivity, and system reliability. It has a s imple
method of application well suited for cost down design in either
a flyback converter or a forward converter .
The FSD20x is specially designed for an off-line SMPS with
minimal external components. The FSD20x is a monolithic
high voltage power switching regulator that combine the
SenseFET(LDMOS) with voltage mode PWM control block.
Included PWM controller features integrated fixed oscillator
with frequency scaling, under voltage lock out, leading edge
blanking, optimized gate turn-on/turn-off driver, thermal shut
down protection and temperature compensated precision
current sources for loop compensation and fault protection
circuitry. Compared to discrete MOSFET and controller or
RCC
switching converter solution, a FSD20x can reduce total
component count, design size, weight and at the same time
increase efficiency, productivity, and system reliability. It has a
basic platform well suited for cost effective design in a flyback
converter.
Maximum Drain Voltage V
Maximum Vstr Pin VoltageV
Continuous Drain Current (T
Continuous Drain Current (TC=25°C)I
Maximum Supply VoltageV
Input Voltage RangeV
Operating Ambient Temperature T
Storage Temperature RangeT
=25°C)I
C
D,MAX
str,max
FSD2000.5A
D,
FSD2011.0A
D,
CC,MAX
FB
A
STG
700V
700V
20V
−0.3 to V
−25 to +85°C
−55 to +150°C
start
PIN Definitions
Pin NumberPin NamePin Function Description
1, 2, 3GNDThese pins are the control ground and the SenseFET Source.
This pin is the inverting input of the PWM comparator, and it operates
normally between 0.5V and 2.5V. It has a 0.25mA current source connected
internally and a capacitor and opto coupler connected externally. A
4Vfb
5Vcc
7Drain
8Vstr
feedback voltage of 3V to 4V triggers overload protection (OLP). There is a
time delay due to the 5uA current source, which prevents false triggering
under transient conditions but still allows the protection mechanism to
operate under true overload conditions.
This is the positivesupplyvoltage input. During operating, power is supplied
from pin1, Vstr and the voltage is regulated by internal HV/reg (7V shunt
regulator). The Auxiliary transformer winding is not needed.
This pin is designed to directly drive the converter transformer and is
capable of switching a maximum of 700V.
This pin connects directly to the rectified AC line voltage source. At start up
the internal switch supplies internal bias and charges an external capacitor
that connects from the Vcc pin to ground. once V
operates, and Trferal HV/REG regulates 7V of V
reaches 7V, then FPS
CC
.
CC
DC
DC
V
Preliminary Specification
2
Page 99
8、Software version view and Upgrade
97
instruction
Software version view
Power on the TV normally, hold the “SOURCE” key for about 10s, then
“Software version, Publish Date and MCU version” info. will display on
the screen.
Software upgrade method
Ⅰ、Power off the power, you can find the software upgrade port beside
the VGA port in the TV back cover (see picture 1).
Software
upgrade port
Picture 1: Software upgrade port
Ⅱ、Connect the computer COM port to the TV upgrade port with upgrade cable,
as the pictures below. If the computer has several COM ports, usually
they will be marked as 1, 2, 3, etc, choose one (suggest to use COM1);
if there is only one COM port, then it is COM1.
*Note: Please upgrade the software by the PC with COM output, if your
PC is Notebook PC, please upgrade before changing PCMCIA into COM port.
Page 100
98
Picture 2. Upgrade cable
Picture 3. COM port of the PC
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