BBK LT1504S User manual

LT1504S
Service Manual

0
TABLE OF CONTENTS
1. Precautions and Safety Notices ································· 1
2. Specification ················································· 2
3. Front Panel Function Control Description ························· 8
4. Adjusting Procedure ········································· 13
5. Trouble Shooting Flow Chart ·································· 16
6. Exploded Diagram and Spare Parts List ·························· 19
7. Block Diagram ·············································20
8. Schematic Diagram ·············································21
9. PCB Layout Diagrams ·········································31

1
1. Precautions and Safety Notices
Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in
the user's manual for this product.
(1) Read all of these instructions.
(2) Save these instructions.
(3) Follow all warnings and instructions a marked on the product.
(4) Unplug this product from the wall outlet before cleaning.Do not use liquid cleaners or aerosol cleaners, use
a damp cloth for cleaning.
(5) Do not use this product near water.
(6) Do not place this product on an unstable cart,stand or tablle.The product may fall,causing serious
damage to the product.
(7) Do not tear up the EMI label, if the label has been destroyed,that must to past same size label on the same
position.
(8) Slots and openings in the cabinet and the back or bottom are provided for ventilation,to ensure reliable
operation of the product and to protect it from overheating,those openings must not be blocked or
covered.The openings should never be blocked by placing the product on a bed,sofa, rug, or other similar
surface.This product should not be placed in a built-in installation less proper ventilation is provided.
(9) This products should be operated from the type of power source indicated on the marketin label. If you are
not sure of the type of power available, consult your dealer or local power company
(10) This product is equipped with a 3-wire grounding type plug,a plug having a third (grounding) pin. This
plug will only fit into a grounding-type power outlet. This is a safety feature, if you are unable to insert the
plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the purpose of
the grounding-type plug.
(11) Pay attention to the code which connects with apheliotropism board of inside panel.and don’t hook it.
(12) Do not allow anything to rest on the power cord.Do not locate this product where persons will walk on the
cord.
(13) If an extension cord is used with this product,make sure that the total of the ampere ratings on the
product plugged into the extension cord to the waplugged into outlet does not exceed 15 ampere.
(14) Never push objects of any kind into this product through cabinet slots as they may touch dangerous
voltage points or short out parts that could result in a risk of fire or electric shock.Never spill liquid of any
kind on the product.
(15) Do not attempt to service this product yourself,as opening or removing covers may expose you to
dangerous voltage points or other risks.Refer all servicing to service personnel.
(16) Unplug this product from the wall outlet and refer servicing to qualified service personnel under the
following conditions :
a. When the power cord or plug is damaged or frayed.
b. If liquid has been spilled into the product.
c. If the product has been exposed to rain or water.
d. If the product does not operate normally,when the operating instructions are followed.Adjust only those
controls that are covered by the operating instructions since improper adjustment of other controls may
result in damage and will often require extension work by a qualified technician to restore the product to
normal operation.
e. If the product has been dropped or the cabinet has been damaged.
f. If the product exhibits a distinct change in performance,indicating a need for service.

2
2. Specification
15” panel specification:
Item Specifications
Display pixels 1024 (H) x768 (V) pixels ( 1 pixel = 1 RGB cells )
Active Area 304.128mm (H) x 228.096mm (V)
Pixel Pitch 0.297mm (H) x 0.297mm (V)
Display Colors 16.2M
Pixel Arrangement R+G+B vertical stripe
Display Mode Normally white
Brightness 250 cd/m2typical
Contrast Ratio 400:1 typical
Brightness Uniformity 75% min.
Viewing Angle 120°(H) 100°(V) at CR ≧10
Color Chromaticity (CIE) White: x = 0.313 , y = 0.329 typical
Frame Rate 60Hz
Response Time 16ms typical
Surface Treatment Hard Coating(3H)，Anti-glare（Haze 25）
INPUT Source :
Connector typesInputs &
Outputs Signals Video Format
OSD
Main-TV Analog TV PAL/SECAM PH Type TV (CABLE/AIR)
VIDEO Video + L/R Audio CVBS RCAx1+ RCAx2
(Red, White) VIDEO1 (REAR)

3
S-VIDEO S-VIDEO+ L/R Audio Y/C Mini Din 4 Pin VIDEO2 (S-VIDEO)
SCART RGB+Y/C+
CVBS(input/output)+
L/R(input/output)
SCART 21pin VIDEO3(SCART IN)
YPbPr Component
(Y, Pb/Cb, Pr/Cr)
+ L/R Audio
480i, 576i, 480p,
576p, 720p, 1080i
RCAx3+RCAx2
(Red, White) VIDEO4 (YPbPr)
PC/VGA VGA IN+ PC AUDIO
IN Analog RGB VGA 15 Pin VIDEO5（VGA IN）
AC IN/Power
Switch AC Power IN AC 100~240V YC14 AC IN
Note:
A. SCART connector.
B. VGA Connector.

4
VGA type connector pin assignment
1.Red Video 6.Red Ground 11.ISP-SEL-I
2.Green Video 7.Green Ground 12.SDA
3.Blue Video 8.Blue G
r
ound 13.H-sync.
4.None 9.+5V 14.V-sync.
5.GND 10.Sync GND 15.SCL
C.RCA jacks are all female type.
D.Mini DIN CNC 4 Pins (SCN570S3NS00000) for S-video, the pin assignment is
described as below:
VGA
Format R, G, B Analog
Level/Impedance 0.7Vp-p / 75Ω
DDC 1/2B Compliant with Revision 1.0
Sync H/V separate
3V TTL level / 1kΩ
Frequency Fh = 31~80 kHz
Fv = 56~76 Hz
Maximum Pixel Clock 135 Mhz
Connector Mini VGA 15 pin (female) x 1
Video (Composite) CVBS Signal
Format NTSC, 4.43NTSC, PAL_M, PAL(B,G,H,D,N), SECAM
Level / Impedance 1.0Vp-p / 75Ω
S-Video (Y/C) Signal
Format Y, C
Level / Impedance Y: 1.0Vp-p / 75Ω
C: ±286 mV/ 75Ω
Analog HD15 Video Signal (YPbPr/YCbCr)
Format Y, Pb, Pr or Y, Cb, Cr
Level / Impedance Y: 1.0Vp-p / 75Ω
Pb/Cb, Pr/Cr: 0.7 ±0.035Vp-p / 75Ω
1: Ground
2: Ground
3: Y
4: C

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HDMI Timing
STANDARD RESOLUTION
V FREQ
Hz H FREQ kHz CLK MHz
480p 720x480 60 31.46 27
576p 720x576 50 31.25 27
720p 1280x720 50 37.5 74.25
720p 1280x720 60 45.0 74.25
1080i 1920x1080 50 28.12 74.25
1080i 1920x1080 60 33.75 74.25
VGA Timing
STANDARD RESOLUTION
V FREQ
Hz H FREQ kHz CLK MHz
VGA 640x480 60 31.47 25.17
VGA 640x480 72 37.86 31.5
VGA 640x480 75 37.5 31.5
SVGA 800x600 60 37.88 40
SVGA 800x600 72 48.07 50
SVGA 800x600 75 46.9 49.5
XGA 1024x768 60 48.36 65.0
XGA 1024x768 70 56.47 75
XGA 1024x768 75 60.02 78.75
SXGA 1280x1024 60 64 108
Video & S-Video AV Timing
STANDARD RESOLUTION
V FREQ
Hz H FREQ kHz CLK MHz
NTSC 525 60 15.734 12.65
PAL(B,G,H,D,I) 625 50 15.625 14.50
SECAM 625 50 15.625 14.50
4.43NTSC 525 60 15.734 12.65
HDTV/Component AV Timing
SDTV 480p 720x480 60 31.461 27
SDTV 480i 720x480 60 15.734 13.5
SDTV 576p 720x576 50 31.25 27
SDTV 576i 720x576 50 15.62 13.5
HDTV 720p 1280x720 50 37.5 74.25
HDTV 720p 1280x720 60 45 74.25
HDTV 1080i 1920x1080 50 28.12 74.25
HDTV 1080i 1920x1080 60 33.7 74.25

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Power Source AC100 – 240 V, 60/50 Hz
Sound Output 10W X2, 8 Ohm.
Signal Connector Pin Assignment
Pin Assignment Pin Assignment Pin
A
ssi
g
nmen
t
1. Red 6. Red Ground 11. Ground
2. Green 7. Green Gro und 12. SDA
3. Blue 8. Blue Ground 13. Horizontal S
y
4. Ground 9. Not Connected 14. Vertical
Sync.
5. Self Test 10. Sync. Ground 15. SCL

7
3. Front Panel Function Control Description
Operation, Adjust and Programming

8

9

10

11
The operation of each OSD controls is described as following table:
Option Description
User
Game
Movie
Vivid
Picture（not
support VGA）
Sport
Press e/fto change the Picture Mode to be User, Vivid,
Game, Sport, and Movie
Brightness
Press e/fto adjust the Brightness from 0 to 100
Contrast
Press e/fto adjust the Contrast from 0 to 100
Tint（not support
PAL）Press e/fto adjust the Tint from 0 to 100
Saturation
Press e/fto adjust the Saturation from 0 to 100
Sharpness Press
e/fto adjust the Sharpness from 0 to 100
Full
Zoom1
Zoom2
Scale （Input
HDMI, YPbPr
(except 480I ) /
VGA source, does
not support scale
function）Normal
Switch between user, zoom1, zoom2 and normal in all
video mode
User
Cool
Picture
Color temp
Warm
Press e/fto select the color Temperature to be User,
Warm, or Cool
User
Live
Pop
Sound mode
Rock
Press e/fto change Sound Mode to be User, Live, POP
and Rock
Volume
Press e/fto adjust the Volume from 0 to 100
Base
Press e/fto change the Bass from 0 to 100
Treble
Press e/fto change the Treble from 0 to 100
Balance
Press e/fto adjust the Balance from 0 to 100
Audio setup
Mute
Press e/fto adjust the Mute on or off
English,
German,
French,
Italian,
Spanish,
Portugal,
Holland
Language
(待定)
Poland
Allow you to select a language for all the on-screen menu.
Time out Press e/fto select the Menu Timeout to be 5,10,15,20,25,
30,35,40,45,50,55,60 seconds.
Transparency
Sleep time Press e/fto select the Sleep Timer to be 15, 30, 45, 60,
90, 120 minutes or Off.
Osd setup
Reset Recall factory setting.
APS Start auto search and auto process
Fine tune Press e/fto adjust the Fine Tune from -50 to 50
TV setup
Add/Erase Allow you to add/remove channels.

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Channel Name Edit the channel name. (Europe only)
Channel Swap Swap the channel location . (Europe only)
Channel reset Allow you to restore a default TV channel table. (TV
only)
Auto Allows you to auto adjust the display mode.
H-Position
Allows you to adjust the position of the picture left and right
in the window
Press VOLUME ( -, +) to adjust the Sharpness from 0 to
100
V- Position
Allows you to adjust the position of the picture left and right
in the window
Press VOLUME ( -, +) to adjust the Sharpness from 0 to
100
Clock AControls the width of the picture based on the VGA mode.
VGA setup
Phase
Allows you to improve focus clarity and image stability
Press VOLUME ( -, +) to adjust the Hue from 0 to 100

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4. Adjusting Procedure
ITEM Equipments Requirements Procedure and SPEC
Color
Temp.Adustment
White balance
adjustment
VG828/Croma2327
Chroma 7120
(untouchable)
1280*800/60 all white
balance
‧ Select SOURCE then choose VGA
‧ Enter the factory area
‧ Select Calibration
‧ Enter Color Temp. to User
‧ Enter User Color temp and adjust the R
G B offset/gain value
a. warm Brightness and
Contrast =>50 Select the warm to
enter the adjustment
option of R.G.B.
Automatically adjust the value of R.G.B and
adjust the Color Temp. of white image to be
x：313 ± 20，y：316 ± 20Y: 200cd/ m2
b. standard Brightness and
Contrast =>50 Select the standard to
enter the adjustment
option of R.G.B
Automatically adjust the value of R.G.B and
adjust the Color Temp. of white image to be
x：295 ± 20.y：305 ± 20 Y: 200%cd/ m2
c. cool Brightness and
Contrast =>50 Select the cool to enter
the adjustment option
of R.G.B
Automatically adjust the value of R.G.B and
adjust the Color Temp. of white image to be
x：281 ± 20.y：288 ± 20 Y:200%cd/ m2
TV mode test Factory TV signal or
TV signal generator Output PAL signal
Check if the picture is normally display under
User menu, and it will display snow without
any signal, and then enter the standby mode
after 15 mins without any signal.
S-VIDEO adjsutment
DVD
S-Video Cable
Play DVD
Set DVD to interlaced
output
Screen is clear and fluent
SACRT output test To accept TV signal Send TV signal
through the SCART Screen is clear and fluent
SDTV(Y,Pb,Pr) 576P
480P
HDTV (Y,Pb,Pr)
720p/1080i
HDTV Receiver
ATSC HDTV Tuner
Component Cable
Hard disc player
Play SDTV/HDTV
(Y,Pr,Pb）
Screen is clear and fluent

14
V
GA INPUT
PC
VGA Cable
zEach Mode can display normally. If there
is a specific Mode that is not appropriate
after switch, press Auto Adjust will to
automatically adjust for appropriate
screen.
zConfirm PC can automated identify the
hd155tpLCD NO.
VGA INPUT TV BOX
D-SUB Cable
zUse external-connect TV BOX, watching
the TV program; the screen is clear and
fluent.
NTSC/PAL Switch
DVD
S-Video Cable
or TV Signal
GENERTOR
”FLUKE 54200” or
approved equipment
Play DVD test disc
VIDEO ESSENTIALS
(A-1)
Set DVD to interlaced
output
zSelect SOURCE then choose
S-VIDEO.
zSending the signal from DVD test disc
(sixth paragraph)
zSwitch DVD output mode from
NTSCand PAL, Watch the
screen to check if has switch
NTSC/PAL
.480P/480i switch
DVD
Component Cable or
TVSignalGENERTO
R
”FLUKE 54200” or
approved equipment
Play DVD test disc
VIDEO ESSENTIALS
(A-1)
Set DVD to
progressive output (P-
SCAN)
zSelect SOURCE then choose
Y CBCR/Y PBPR
zSending the signal from DVD
test disc(sixth paragraph)
zSwitch DVD to output mode P-SCN
ON/OFF
zsee if there is the action of switch
(480i/480p).

15
.SOUND mode
Pattern Generator
Audio source output
External connect
Left/Right speaker
(2.5/8ohm)
Any Pattern
zSelects SOURCE menu
zEnterthe SOUND adjustment
item.
a. Volume
DVD/VCD plays
music or DVD disc
zPress ▲/▼to set audio volume
zCheck if the action is normal.
b. Treble
DVD/VCD plays
music or DVD disc
zPress▲/▼to set audio volume
zCheck if the action is normal.
zThe default is”50”
c. Bass
DVD/VCD plays
music or DVD disc
zPress ▲/▼to set Bass volume
zCheck if the action is normal.
zThe default is”50”
d.Balance zPress ▲/▼to set balance
zThe default is”50”
e.Mute zPress ▲/▼to set balance
zThe default is”off”
Surround Mode DVD/VCD plays
music or DVD disc
zPress to set ON/OFF
zCheck if the sound has change
zThe default is”OFF”
NICAM
GENERTOR"FLUKE
54200"or approved
equipment
zPress I-II button on the remote
zCheck if the sound has
change.
Super Freq. test Pattern Generator
VGA Cable zCheck if OSD displays”super Freq.”
Remote function test.
PC
Pattern Generator
TV Signal Generator
DVD or VCD
HDTV Player
zCheck if each function is normal under
each mode
.TUNER FLUKE54200
zSelects SOURCE to be TV
zSelects TV SOURCE AIR
zCheck if Screen is clear and
fluent
zSelects TV SOURCE CABLE
zCheck if Screen is clear and
fluent

16
5. Trouble Shooting Flow Chart
STEP 1.
No NO No
YES YES
YES YES
NO
NO
NO
YES
NO
OK
NG YES
YES
OK
NO
No Display
( Black )
LED ON ?
Push the power
ON/OFF switch
LED Color
change ?
Check KEY/ LED
board &J7
LCD TV
ON?
Check
Video& Audio
Function
Make sure the
LVDS
connection of
LCD Panel is
fine ?
U16-Pin3
High ?
Check the A/D board
tuner U16-Pin3
Check Inverter Power
(24V)of LCD Panel, OK?
B
Display ?
Check Video&
Audio Function
A
Check AC
Socket ?
Change AC Socket
Fuse or power board
C
Change AD
Board

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NO
YES
YES
YES
NO
NO
YES
YES
NO
B
U16-PIN5
Active low(See
Panel SPEC.) ?
Change the LCD
Panel
Display ? Check Video&
Audio Function
Change AD
Board
A
Check the connection
of Signal cable
Display ?
Check Video&
Audio Function
Change AD Board
Change AD Board

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STEP 2.
NO
NO
OK
STEP 3.
OK OK OK
NG
NG
No TV,VIDEO
and VGA
Picture
Change AD
Board
No Audio
Change Speaker
Check
A/D board
J4 Check
Speaker
Check
Video&
Audio
Function
Change AD
Board or U2
Check
Video&
Audio
Function
Check
Video&
Audio
Function
OK
C