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
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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
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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.
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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
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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
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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

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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.
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Left panel
STANDBY button
Press to switch on the device/into
standby mode.
Headphones output
POWER button
Turn on/off the power.
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2.3 CONTROLS AND FUNCTIONS
Remote control sensor
Power supply indicator
Front panel
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2.3.2 Remote control general view
OK
SETUP SOURCE
DVB
SCART
MUTE STANDBY
YPBPRPICTURE
AVTV
SOUND
VGA
AUDIODISPLAYVOL
CHCH
+
SUBTEPG FAVTV/
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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.

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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.
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-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.
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SELECT RETURN SETUP
ENTER
2.4.1Switching interfaces
2.4 CONNECTION AND
STARTING
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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.

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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.