BBK LT1516D User manual

Service Manual
LT1516D(RU)
Model version:M1B1V2.10
M1B2V2.10

Catalog
Chapter One About Maintenance
1.1 Safety precautions
1.1.1 Power supply
1.1.2 Precautions for antistatic
1.1.3 Precautions for display screen
1.1.4 Precautions for laser head
1.1.5 About placement position
1.2 Maintenance method
1.2.1 Electric resistance method
1.2.2 Voltage method
1.2.3 Current method
1.2.4 Element substitution method
1.2.5 Cutting method
1.2.6 Visualized method
1.2.7 Comparison method
1.3 Required device for maintenance
Chapter Two Functions and Operation Instructions
2.2 Set list
2.5 TV Mode
2.1 Features
2.3 Controls and functions
2.3.1 Panel controls and indication
2.3.2 Remote control general view
2.4 Connection and starting
2.4.1Switching interfaces
2.6 PC monitor mode
2.7 DVB Function settings selection
1
1
1
1
1
2
2
2
2
2
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
8
9

2.8 Others
Chapter Three Principle and Servicing
Section One Principle of the player
3.1.1 System control principle
3.1.3
Power circuit
Video circuit
Section Two Troubleshooting flow chart
Section Three
Chapter Four Disassembly and Assembly Process
3.1.2
3.1.4
3.1.5
3.1.6
OVerall wiring diagram
Block diagram of the player
Audio circuit
3.1.7 Block diagram of DVB
Waveform diagram
Chapter Cinque PCB board & Circuit diagram
Section One PCB board
Section Two Circuit diagram
Chapter six BOM List
6
11
13
13
13
14
15
16
16
17
17
19
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40
42
42
44
60

Chapter One About Maintenance
1.1 Safety precautions
1.1.1 Power supply
When maintenance personnel are repairing TV , he should pay special attention to the power with
220V 800V AC and 330V DC which will cause hurt and damage to persons!
1.1.2 Precautions for antistatic
Movement and friction will both bring static electricity which causes serious damages to integrated
IC. Though static charge is little, when a limited quantity of electric charge is added to large
scaleintegrated IC, as the capacitance is very small in the meantime, now the integrated IC is very much
easy to be struck through by static electricity or the performance will decrease. Thus static electricity
prevention is of extraordinary importance. The following are several measures to prevent static
electricity:
1. Use a piece of electric conduction metal with the length of about 2 metres to insert into the earth,
and Fetch the lead wire from the top of the surplus metal and connect to the required static electricity
device. The length and depth of the metal embedded under the earth should be determined according to
the wettability of the local soil. For humid places, it may be shorter, and longer and deeper for dry places.
If possible, it can be distributed and layed in terms of “#” shape.
2. On operating table-board, the antistatic table cushion should be covered and grounded.
3. All devices and equipments should be placed on the antistatic table cushion and grounded.
4. Maintenance personnel should wear antistatic wrist ring which should be grounded.
5. Places around the operating position should also be covered with electric conduction cushion or
Painted with antistatic paint.
1.1.3 Precautions for display screen
1. Display screen is breakable article, so please protect carefully when carrying and prevent fingers
or hard objects striking the screen to damage structure of the screen.
2. When cleaning screen, do not use organic chemicals. You should use cloth and use small
amount of special cleaning liquid in places difficult to clean.
- 1 -

- 2 -
1.1.4 Precautions for laser head
1. Do not stare at laser head directly, for laser emission will occur when laser head is working,
which will Hurt your eyes!
2. Do not use wiping water or alcohol to clean laser head, and you may use cotton swab.
1.1.5 About placement position
1. Never place TV in positions with high temperature and humidity.
2. Avoid placing near high magnetic fields, such as loudspeaker or magnet.
3. Positions for placement should be stable and secure.
1.2 Maintenance method
1.2.1 Electric resistance method
Set the multimeter in resistance position and test whether the numerical value of resistance of each
point in the circuit has difference from the normal value to judge the trouble spot. But in the circuit the
tested numerical value of resistance is not accurate, and the tested numerical value of integrated IC's
pins can only be used for reference, so the elements should be broken down for test.
1.2.2 Voltage method
Voltage method is relatively convenient, quick and accurate. Set the multimeter in voltage position
and test power supply voltage of the player and voltage of a certain point to judge the trouble spot
according to the tested voltage variation.
1.2.3 Current method
Set the multimeter in current position and test current of the player of a certain point to judge the
trouble spot. But when testing in current method, the multimeter should be series connected in the
circuit, which makes this method too trivial and troublesome, so it is less frequently used in reality.
1.2.4 Element substitution method
When some elements cannot be judged good or bad, substitution method may de adopted directly.
1.2.5 Cutting method
Cutting method should be combined with electric resistance method and voltage method to use.
This method is mainly used in phenomena of short circuit and current leakage of the circuit. When
cutting the input terminal voltage of a certain level, if voltage of the player rises again, it means that the
trouble lies in this level.

1.2.6 Visualized method
Directly view whether abnormalities of collision, lack of element, joint welding, shedding welding,
rosin joint, copper foil turning up, lead wire disconnection and elements burning up among pins of
Elements appear. Check power supply of the machine and then use hands to touch the casing of part of
elements and check whether they are hot to judge the trouble spot. You should pay more attention when
using this method to check in high voltage parts.
1.2.7 Comparison method
A same good PC board is usually used to test the correct voltage and waveform. Compared these
data with those tested through fault PC board, the cause of troubles may be found.
Through the above maintenance method, theoretical knowledge and maintenance experience, all
difficulties and troubles will be readily solved.
1.3 Required device for maintenance
Audio Generator
Digital oscillograph ( 100MHE)
SMD rework station
Multimeter
Soldering iron
Pointed-month pincers
Cutting nippers
Forceps
Electric screw driver
Terminals connecting cord
Headphone
Microphone
- 3 -

2.1 Features
Technical Features
#High quality color TFT panel
#Maximum resolution 1366x768 for LT1516D.
#Multisystem TV tuner with NICAM decoding
#Biuilt-in stereo audio system
#Composite video ,audio input
#Component, RGB/SCART and VGA video input
#Digital coaxial output for multi-channel sound playback
#Headphones output
#Universal holder for furniture or wall fixation with 270 rotation angle
TV Channels Receiving and External Signal Playback
#DVB-T turner for watching digital TV channels.
#Automatic and fine tuning functions with 100 channels memory
#Adjustable brightness, contrast, saturation, hue and 4 preset image settings
#Tone and sound balance adjustment and 4 preset audio settings
PC monitor mode
#Wide resolutions range
#RGB setting and 4 presets of color temperature
#Tone and sound balance adjustment and 4 preset audio settings
#External audio signal playback.
Chapter Two
Functions and Operation Instructions
- 4 -
2.2 Set list
LCD TV
Remote Control
AAA Battery
Power Adapter
Power Cord
RCA-RCA cord
2XRCA-2XRCA cord
Wall Mount Holder
Screw M5X15
Screw PA5X25
Screw PM4X10
Screw BM 4x10
Pedestal componet
Supporting componet of pedestal
Expandable pipe
User manual
Warranty Card
1pcs
1pcs
2pcs
1pcs
1pcs
1pcs
1pcs
1pcs
1pcs
4pcs
4pcs
7pcs
1pcs
1pcs
4pcs
1pcs
1pcs

- 5 -
2.3.1 Panel controls and indication
SETUP button
Press to switch to setup mode
_VOL+button
Press to adjust the volume.
_CH+button
Press to switch between channels/to
choose menu item.
SOURCE button
Press to choose the playback mode.
1
2
Left panel
STANDBY button
Press to switch on the device/into
standby mode.
Headphones output
POWER button
Turn on/off the power.
3
4
2.3 CONTROLS AND FUNCTIONS
Remote control sensor
Power supply indicator
Front panel
6
7
5
8
9
1
2.3.2 Remote control general view
OK
SETUP SOURCE
DVB
SCART
MUTE STANDBY
YPBPRPICTURE
AVTV
SOUND
VGA
AUDIODISPLAYVOL
CHCH
+
SUBTEPG FAVTV/
4
3
8
2
1
10
5
7
6
9
11
MUTE button
Press to turn on/off the sound.
Numeric buttons
Button
Press to switch to previous channel.
TV button
Press to switch to TV mode.
AV button
Press to switch to AV IN mode of video
signal.
YPbPr button
Press to switch to YPbPr mode of video
signal.
PICTURE button
Press to select picture mode.
Cursor buttons
OK button
Press to switch to setup mode.
SETUP button
Press to switch to setup mode.
-CH+ buttons
Press to change the channel number.

21
20
22
23
25
24
5
7
8
6
4Y Cb(Pb) Cr(Pr)
PC AUDIO IN
Meant for PC stereo audio output
connection.
COAXIAL OUT
Meant for multi-channel sound playback.
AUDIO VIDEO IN
Used for external signal source connection.
12 V socket
Meant for adapter connection.
2.5
This LCD TV can store up to 100 channels
and enables to scan channels thought automatic,
manual and fine tuning scanning mode. Built-in
TV tuner supports stereo audio playback in
NICAM system.
2.5.1 Adjusted channels selection
#Press +CH-buttons on the left panel or CH
buttons on the remote control each time, when
you want to change a channel.
#Use numeric buttons to enter the number of the
channel.
#Press button to return to the previous
channel.
2.5.2Default picture settings
selection
#You may select one of the default picture
settings:
USER, STANDARD, DYNAMIC and SOFT.
#You may adjust necessary parameters in the
device menu.
#Turn to Picture item on this page for details.
TV MODE
2.5.3Default sound settings
selection
#You may select one of the default sound
settings:
USER, MUSIC, FILM and NEWS.
#You may adjust necessary parameters in the
device menu.
#Turn to page.13 for details.
- 6 -
18
19
-VOL+ buttons
Press to decrease/increase volume.
EPG button
To display the program guide valid in DVB
mode.
FAV button
In DVB mode, open favourite channel list.
TV/ button
Switch between TV and radio modes, valid
in DVB mode.
SUBT button
Press to change the subtitles language.
DISPLAY button
Press to display information.
AUDIO button
Switch NICAM mode in TV mode/Switch
Audio language in DVB mode.
SOURCE button
Press to enter or exit source menu.
SOUND button
Press to select different sound field modes.
DVB button
Press to switch to DVB mode.
VGA button
Press to switch to VGA mode of video
signal.
SCART button
Press to switch to SCART mode of video
signal.
-/-- button
Press to switch one or two-digit program
number.
STANDBY button
Press to switch between standby mode and
power-on mode.
12
14
13
15
16
17
SELECT RETURN SETUP
ENTER
2.4.1Switching interfaces
2.4 CONNECTION AND
STARTING
3
2
1RF input
Meant for antenna connection.
VGA port
Meant for PC connection.
SCART socket
Meant for external audio video signal
source connection. There is no need to
use additional audiocord.

- 7 -
2.5.4 Accompanying sound type
#Only some of the TV channels have stereo
accompanying sound in NICAM system.
#Press NICAM button to select accompanying
sound.
2.5.5 TV settings
#Press SETUP button to display the menu.
#Use cursor buttons on the remote control or
+CH-buttons on the left panel to select the item.
Use buttons to adjust selected parameter.
Use OK button for confirmation. Press SETUP
button again to return to the main menu or to
exit TV SETUP.
2.5.6 Picture
#Select PICTURE item to adjust picture
parameters.
#You may adjust BRIGHTNESS, CONTRAST,
SATURATION, TINT, SHARPNESS and COLOR
TEMP.
NOTE
You can’t adjust TINT while watching TV
channels.
2.5.7 Sound
#Select SOUND item to adjust sound
parameters.
#You may adjust BALANCE, BASS, TREBLE
and NICAM.
ATTENTION! We recommend watching TV at
halfof maximum level of the sound. Continuous
listening at higher level may lead to hearing
reduction.
2.5.8 TV setup
Select TV SETUP item to adjust channels.
CHANNEL, COLOR SYSTEM, SOUND
SYSTEM, FINE TUNING, AUTO SEARCH,
MANUAL SEARCH and CHANNEL EDIT.
#CHANNEL item enables to select the number of
adjustable channel.
#CHANNEL EDIT submenu enables to select,
skip and swap the channel.
#CHANNEL parameter enables to select current
channel.
#SKIP function enables to make current channel
inaccessible while using +CH-button to browse
channels.
RETURN SETUP
#SWAP function enables to select the channel
number to swap with current channel.
#SAVE parameter enables to confirm the swap
function.
#FINE TUNING item enables to adjust the
channel frequency accurately.
#MANUAL SEARCH item enables to change
channel settings.
#AUTO SEARCH item enables to adjust channel
setting automatically.
#COLOR SYSTEM item can be changed
between: AUTO, PAL and SECAM. We
recommend to set this item to AUTO.
#SOUND SYSTEM item can be changed
between: B/G, D/K, Land I.

2.5.9 Function
You may select LANGUAGE,
TRANSPARENCY, SLEEP and RATIO.
#LANGUAGE item enables to select the OSD
language.
#TRANSPARENCY item enables to adjust
transparency of OSD.
#SLEEP item enables to set the sleep timer.
#RATIO item can be changed between 16:9 and
4:3,ZOOM1 and ZOOM2.
#RESET item enables to reset all values to
default.
2.5.10 Video settings
#Press SETUP button to display the menu.
#In external video signal playback mode the
menu is the same as the menu, described on
pages 12and 13.
NOTE:
In external video signal playback mode TV
SETUP item is inaccessible.
2.6.1Picture
Select PICTURE item to adjust picture
parameters.
You may adjust BRIGHTNESS, CONTRAST,
COLOR TEMPERARURE and AUTO CONFIG.
2.6.2 Sound
Select SOUND item to adjust sound
parameters.
You may adjust SOUND MODE, BALANCE,
BASS and TREBLE.
2.6.3Monitor setup
Select MONITOR item to adjust such
parameters as PHASE, FREQUENCY, H-
POSITION and V-POSITION.
2.6.4 Function
You may select LANGUAGE,
TRANSPARENCY, SLEEP and RADIO.
#LANGUAGE item enables to select the OSD
language.
#TRANSPARENCY item enables to adjust
transparency of OSD.
#SLEEP item enables to set the sleep timer.
#RATIO item can be changed between 16:9 and
4:3,ZOOM1 and ZOOM2.
#RESET item enables to reset all values to
defaule except ratio function.
#Select COLOR TEMPERATURE subment to
adjust color temperature of the picture.
#COLOR TEMP. Item can be set to :USER,
NORMAL, WARM and COOL.
#RED, GREEN and BLUE items enables to
adjust RGB value of color temperature.
#Use AUTOCONFIG to configure display
parameters automatically.
NOTE:
The picture can be displayed incorrectly
while adjusting.
- 8 -
2.6 PC MONITOR MODE

2.7 DVB FUNCTION
SETTINGS
Turn on the TV. Press SOURCE button to
change source to DVB, then you can enjoy the
rich and colorful contents of Digital Video
Broadcast!
In DVB mode, press SETUP button, then
press button to choose DVB item, the DVB
setup menu will be displayed as follow:
2.7.1 General setup
1.TV Display: This item is used to set the output
picture ratio of this unit.
#Optional settings: Normal/PS, Normal/LB, Wide,
Squeeze; Default: Wide.
2.OSD language: This item is used to set the
OSD language.
#Optional settings: English, Russian; Default:
English.
3.TV Type: To set the output video system of this
player.
#Optional settings: PAL, Auto, NTSC; Default:
PAL.
4.Default: This item is used to restore all settings
to the default value except” Parental control”
and “Password” in the setup menu.
- 9 -
2.7.2 Video setup
1.Sharpness:This item is used to set the
sharpness of video ouputs.
#Optional settings: High, Medium, Low; Default:
Med.
2.Brightness: This item is used to set the
brightness of video outputs.
3.Contrast: This item is used to set the contrast
of video outputs.
4.Gamma: This item is used to set the color
temperature of video output.
#Optional settings: High, Medium, Low, None;
Default: None.
5.Hue: This item is used to set the hue of video
outputs.
6.Saturation: This item is used to set the
saturation of video outputs.
The DVB-T Setup Page is composed of five
parts: Area, Time Zone, parental Age, Antenna
Power, Channel Setup.
Note:
Press button to select different item, and
press OK or button to enter it.
Press button to return to the previous menu
or to exit the current menu.
2.7.3 DVB-T setup
1.Area
You can choose the area of your country.
Optional settings: Australia, Austria, Belgium,
Russian, Denmark, Estonia, Germany, Spain,
France, ltaly, Netherland, Taiwan, Others;
Default: Russian.
Note: you must set the correct area before
searching channels.
2.Time zone
To choose your time zone, it is set depending
on your country. If you don’t know the exact time,
please ask local time manage department.
Default:03:00
3.Parental age
This item is used to set the parental control
ratings. To prevent your children watching
undesired programmes.
#Optional settings:
4,5,6,7,8,9,10,11,12,13,14,15,16,17,18, Disable
Default: Disable
4.Antenna power
Turn on/off antenna power supply. Optional
settings: On. Off; Default: Off

Adjust channel
You can set your favorite channel, set parental
control age for some channels or delete channel
in Adjust Channel window.
1. Select channel using button, Press number
button 1 to set this channel as one of your
favorite channels.
2. Select channel using button, if you don’t like
this channel press number button 2 to skip it.
3. Select channel using button, press number
button 3 to set this channel as a protected one,
to prevent children from watching the undesired
program.
Note: If you set a channel protected, a password
will need to be inputted in the Protect Channel
window.
The default a password is 000000.
Channel remap
You can change every channel position as
you like in channel remap window.
Reserve channel
If you want to watch a special program on a
channel at a later time, you can reserve it.
Then a reminding signal will be displayed on
screen several minutes before it starts.
When playing a program on a channel, press
EPG button, then a program information list of
current channel will be displayed in a window,
move the cursor to PROGRAM, then press OK
button, a more detailed program list will be
displayed, move the cursor to the program which
you want to watch, then press OK button on
remote control as shown in the window.
The program is saved in your reserved channel.
2. Enter the frequency you want to scan by the
number buttons, then press “OK”, the scan
button seems be pressed, press “OK” again to
scan, a scan sign: scanning will be shown on the
window.
3. The scan result will be displayed on the right
halt of the manual scan window, you can save
the found channels or delete them if the TV has
the same program.
- 10 -
Auto Scan
Connect the antenna to the Therefore socket
on the TV, if the antenna needs a power supply,
turn on/off antenna power supply in the menu.
Then you can automatically search channels
without entering any other information.
In the scan process, the scan result will be
displayed in the Auto Scan window.
Press SETUP button to enter setup menu, then
choose the DVB item;
Using the button to select the Auto Scan
item, and press OK or button to select Start
item, then press OK button;
A prompting message will be displayed to
request that you confirm, select” OK” and press
the OK button to confirm.
Note: If you press the SETUP button during
scanning, the operation is stopped and a
prompting message will be displayed at the
buttom of Auto Scan window. Select” OK” and
press [OK] button to abort auto scan operation,
and the channels found until then will be saved.
And select “ Cancel” and press OK button to
return to auto scan process. Wait while the TV
searches for the channels, this may take a few
minutes.
Once you press OK button to start auto
search operation, all the saved channels will be
cleared.
Please don’t press any button during the course
fo default operation.
Manual scan
1. In setup menu, select” Manual Scan”, a
manual scan will be shown as follows:
5.Channel setup
This item is used to search channels, edit the
channel list or your favourite channel list. View
program guide information, etc.
- -
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- 11 -
You can set the time when the reminding
signal should be displayed before the program
starts.
2.7.4 Password setup
Password: This item is used to set a six digit
password to enable you to change the parental
control ratings.
Password Mode:
To set whether parental control function needs a
password, optional setting: On, Off; Default: On.
Password:
To change the password of the parental control
function, default:000000
2.8 OTHERS
2.8.1 Useful notes
#To extend the service life of your LCD TV make
pauses of not less than 30 seconds between
switching off and repeatedly switching on the
LCD TV.
#Disconnect the LCD TV from the wall outlet
after shutdown.
#Use supply sources of rated voltage, otherwise
the LCD TV may not function or be damaged.
#In case of the LCD TV’s occasional stops,
please switch the power supply off and then on
again.
DVB
2.8.2 Trouble shooting
Please check probable causes of malfunction before addressing the service center.

#We are permanently improving the quality of our products; hence the product’s design, functionality
and technical characteristics may be modified without prior notice.
- 12 -
2.8.3 Technical characteristics

- 13 -
Chapter Three Principle and Servicing
Section One Principle of the player
3.1.1 System control principle
System control schematic diagram is shown in the figure 3.1.1.1:
power control circuit
STV8317
PANEL_ON
control circuit
Inverter components
Remote control board
Reset circuit
Key-press board KEY1~KEY5
RESET
IR
INVERTER
ON/OFF
PANEL_ON
STBY
SDARX
SCLTX
IC-MST718MCU
SCART JACK
DVSTB
Figure 3.1.1.1 System control schematic diagram
DVSCK
DVSDA
MT1389HD
FB
SS
U104
PS25LV010
WP
SPICK
SPIDI
SPIDO
SPICZ
T4094 VSDA VSCK
Serial/parallel converter
U102
CD4094
Mute control circuit
MUTE
ONMUTE
8216_RST
ASW DVB Moduie
FSAV433
VS1
VS2
U101

MAIN BOARD
INVERTER BOARD
EARPHONEBOARD
@5AK0833-10
5471902
12VSW
GND
J501
TV KEY BOARD
5VEXT
GND
STBY
IR
Brightness
GND
BLON
GND
GND
+12V
+12V
21901-4
CN105 CN106
REMOTE BOARD
B1903-3
SW1 GND
SW2
4942009
41903-0
5449438
4942100
CN113
CN103
4942069 5IN1516-0
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
VCC-PANEL
VCC-PANEL
VCC-PANEL
GND
GND
GND
GND
LVA3P
LVA3M
LVACKP
LVACKM
LVA2P
LVA2M
GND
LVA1P
LVA1M
GND
LVA0P
LVA0M
LVA3P
LVA3M
LVBCKP
LVBCKM
GND
LVB2P
LVB2M
LVB1P
LVB1M
LVB0P
LVB0M
CN111
4941497
H1506-1
AMPRIN+
GND
ARPLIN-
GND
AMPROUT+
GND
AMPROUT-
CN701
PANEL
SVA150XG04TB 15 TFT
1210554
- 14 -
figure 3.1.2.1 overall wiring diagram
3.1.2 OVERALL WIRING DIAGRAM
POWER BOARD

- 15 -
3.1.3 Block diagram of the player
figure 3.1.3.1 Block diagram of the player
U101
MST718
LCD picture
processor&MCU
Reset circuit
Q103 Ce101
MST_RESET
U104 FLASH
PS25LV010
U103
EEPROM
24C32
U106
Video
electronic
switch
FSAV433
SCART
JACK
YPBPR
INPUT
JACK J105
Video
amplify
TUNER
U119
PN2020
U116
MT8606
U302
DVD
FLASH
U301
U303
EEPROM
24C16
U117
MC4580Audio
amplifying circuit
U4
NICAM
processing
circuit
STV8317
PC AUDIO
TUNER
Audio output
amplifying
circuit
Audio
amplify
TDA7266
VGA
JACK
SCART JACK
J105
A/V input terminal
J103
U114
TUNER
DVB/CARD
Conversion
switch
U108/U2
SDRAM
Button board
& receiving
board of RC
Control circuit
of boost
voltageboard
U102
CD4094
Mt1389
DVD decode chip
GPIO_3
GPIO_4
XIDD8 XIDD0
XIDD0 XIDD15
TSDATA0 TSDATA7
If2 If1
X602
20.48MHZ
X109
27MHZ
DFA[0:20] DFD[0:7]
DDQ[0:15]
DMA[0:11]
DCVBSIN+/DCVBS- 22/23
34
67
66
SDARX
SCLTX
SCVBS+
SCVBS-25
24
TV+/TV-30/31
PRIN
PBIN
Y
7/8
9/10
12/13
SR SGSB
EY EPB EPR
DY
DPB
DPR
89AL
89AR
226
224
DSCL
DSDA
DVSTB
DVSCK
DVSDA
63 73 83
109
100
98
SRIN
SLIN
DRIN
DLIN
AVRIN
AVLIN
PCLIN
PCRIN
SIOMAD
AO2L
AO2R
LSL
LSR
4
12
2
15
14
T4094 VSDA VSCK
123
INVERTER_ON/OFF
Brigtness
BLON
+12V
IR
KEY1
KEY2
SPICK
SPIDI
SPIDO
SPICZ
LVA0P LVA3P
PANEL ON
74
12MHZ
X101
U112
MONOIN
U114
LVA0M LVA3M
LVB0P LVB3P
LVB0M LVB3M
LVBCKP LVBCKM
LVACKP LVACKM
STBY1
8216_RST
FMUTE
ASW
ONMUTE
MUTE
VS1
VS2
AUDIO
VIDEO
21901-4
U115
PANEL
SCART
INVERTER
BOARD
1

3.1.4 Audio circuit
Audio processing circuit is mainly responsible for the switch, amplifying and restire of audio and
composed of audio source input selection and NICAM processing circuit, audio amplifying circuit and
mute control circuit. Audio processing circuit block diagram is shown in the figure 3.1.4.1:
Figure 3.1.4.1 Audio processing circuit block diagram
- 16 -
3.1.5 Power circuit
Power circuit supplies stable and pure power for each unit circuit to ensure normal working of the
player. Power circuit block diagram is shown in the figure 3.1.5.1:
U507
Lm1085
MST718
U505
AMS1117
U521
LM1085
U1
AMS1117
U513
+2.5V
MST718
+3.3V
Dv33
1.8V
3.3V
+12V
IC 503
AP1506
U511
Standby
control circuit
INVERTER
BOARD
U506
+5VEXT
Figure 3.1.5.1 Power circuit block diagram
AP1506
5V
+12V
STBY
U117
MC4580Audio
amplify circuit
STV8317
NICAM
processing
circuit
PC AUDIO
TUNER
Audio output
Amplifying
circuit
Audio
amplifying
TDA7266
SCART JACK
J105
A/V input terminal
J103
U114
SCART
89AL
89AR
226
224
SRIN
SLIN
DRIN
DLIN
AVRIN
AVLIN
PCLIN
PCRIN
SIOMAD
AO2L
AO2R
LSL
LSR
4
12
1
2
15
14
U112
MONOIN
MT1389 28
29
13
14
92
98
9
10
19
20
34
36
17
18
Power adapter
AMPRIN+
AMPLIN+
AMPROUT+
AMPLOUT+
H1506-1
U4

3.1.6 Video circuit
Video circuit is mainly responsible for the input of external video signals, the processing of video
signals send from tuner, and the drive processing of LCD screen, including video input selection, video
A/D conversion circuit, LCD picture processing circuit and video output circuit. Video circuit block
diagram is shown in the figure 3.1.6.1:
U101
MST718LCD picture
processor&MCU
PANEL
U106
Video
Electronic
switch
FSAV433
SCART
JACK
Y PB PR
INPUT
JACK
Video
amplifying
TUNER
DCVBSIN+/DCVBS-
22/23
34
67
66
SDARX
SCLTX
SCVBS+
SCVBS- 25
24
TV+/TV-
30/31
PRIN
PBIN
Y
7/8
9/10
12/13
SR SG SB
EY
EPB
EPR
DY
DPB
DPR
12MHZ
X101
Mt1389
Figure 3.1.6.1 Video circuit block diagram
- 17 -
LVA0~3P
LVA0~3M
LVACKP
LVACKM
LVBCKP
LVB0~3P
LVB0~3M
LVBCKM
VGA JACK
BIN+ BIN-
GIN+ GIN-
RIN+ RIN-
VGA-VSYN
VGA-HSYN
185
187
182
183
17
13
15
3.1.7Block diagram of DVB is shown in figure3.1.7.1:
1.LT1516D machine consists DVB function and can demodulate DVB-T signal.LT1516D
does not consist this circuit.DVB part of this machine adopts PN2020AT+MT8606 and other
elements. Block diagram of DVB part is shown as follows:
U114
TUNER
TV+
TV- MST718BU
IF1
IF2
TUNSDA_D1
TUNSCL_D1
U119
PN202AT
TSDATA0~TSDATA7
TSVALID
TSSTRT
TSCLK
TSFALL/RESET
STV8317
MT8606
Transport
stream
Receiver
XIDD0~XIDD15
XIDA0~XIDA2
XIIORDY
XIDIOW
XIINTRO
SIDIOR
0689_CLK
ASDFAT0
8606_RST
MT1389
Aideo/Video
Decoder
Figure 3.1.7.1 DVB circuit block diagram