BBK LT1504S Schematic

SUBJECT:
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DK1594-TP0

Service Manual

MODEL NO:

DK1594-TP0

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DOC.NO:

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EFFECTIVE DATE:

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REVISION: A1
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COPY TO All CONTENTS

APPROVED BY/

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CONCURRED BY/

REVIEWED BY/

PREPARED BY/

1

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

0

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.

1

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/m2 typical
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
Response Time
Surface Treatment

60Hz

16ms typical

Hard Coating(3H)，Anti-glare（Haze 25）

INPUT Source :

Signals Video Format

Outputs
Main-TV Analog TV PAL/SECAM PH Type TV (CABLE/AIR)
VIDEO Video + L/R Audio CVBS RCAx1+ RCAx2

(Red, White)

2

Connector types Inputs &

OSD

VIDEO1 (REAR)

S-VIDEO S-VIDEO+ L/R Audio Y/C Mini Din 4 Pin VIDEO2 (S-VIDEO)

SCART RGB+Y/C+

CVBS(input/output)+

SCART 21pin VIDEO3(SCART IN)

L/R(input/output)

YPbPr

Component
(Y, Pb/Cb, Pr/Cr)

480i, 576i, 480p,
576p, 720p, 1080i

RCAx3+RCAx2
(Red, White)

VIDEO4 (YPbPr)

+ L/R Audio

PC/VGA

AC IN/Power
Switch

Note:
A. SCART connector.

VGA IN+ PC AUDIO

Analog RGB VGA 15 Pin

VIDEO5（VGA IN）

IN
AC Power IN AC 100~240V YC14 AC IN

B. VGA Connector.

3

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 Ground 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:

1: Ground
2: Ground
3: Y
4: C

VGA

Format

Level/Impedance

DDC 1/2B

Sync H/V separate

Frequency Fh = 31~80 kHz

Maximum Pixel Clock

Connector

Format

Level / Impedance

Format

Level / Impedance Y: 1.0Vp-p / 75Ω

Format

Level / Impedance Y: 1.0Vp-p / 75Ω

4

R, G, B Analog

0.7Vp-p / 75Ω

Compliant with Revision 1.0

3V TTL level / 1kΩ

Fv = 56~76 Hz
135 Mhz

Mini VGA 15 pin (female) x 1

Video (Composite) CVBS Signal

NTSC, 4.43NTSC, PAL_M, PAL(B,G,H,D,N), SECAM

1.0Vp-p / 75Ω

S-Video (Y/C) Signal

Y, C

C: ± 286 mV/ 75Ω

Analog HD15 Video Signal (YPbPr/YCbCr)

Y, Pb, Pr or Y, Cb, Cr

Pb/Cb, Pr/Cr: 0.7 ± 0.035Vp-p / 75Ω

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

5

t

y

Power Source

Sound Output 10W X2, 8 Ohm.
Signal Connector Pin Assignment

AC100 – 240 V, 60/50 Hz

Pin Assignment Pin Assignment Pin Assignmen

1. Red 6. Red Ground 11. Ground

2. Green 7. Green Gro und 12. SDA

3. Blue 8. Blue Ground 13. Horizontal S

4. Ground 9. Not Connected 14.

5. Self Test 10. Sync. Ground 15. SCL

Vertical
Sync.

6

3. Front Panel Function Control Description

Operation, Adjust and Programming

7

8

9

10

The operation of each OSD controls is described as following table:

Option Description

User
Game
Movie

Vivid

Sport

Full
Zoom1
Zoom2

Normal

User
Cool

Warm

User

Live
Pop

Rock

Press e/f to change the Picture Mode to be User, Vivid,
Game, Sport, and Movie

Press e/f to adjust the Brightness from 0 to 100
Press e/f to adjust the Contrast from 0 to 100
Press e/f to adjust the Tint from 0 to 100

Press e/f to adjust the Saturation from 0 to 100

to adjust the Sharpness from 0 to 100

e/f

Switch between user, zoom1, zoom2 and normal in all
video mode

Press e/f to select the color Temperature to be User,
Warm, or Cool

Press e/fto change Sound Mode to be User, Live, POP
and Rock

Press e/fto adjust the Volume from 0 to 100
Press e/fto change the Bass from 0 to 100
Press e/fto change the Treble from 0 to 100
Press e/fto adjust the Balance from 0 to 100

Picture

Audio setup

Picture（not

support VGA）

Brightness

Contrast

Tint（not support

PAL）

Saturation

Sharpness Press
Scale （Input
HDMI, YPbPr

(except 480I ) /

VGA source, does

not support scale

function）

Color temp

Sound mode

Volume

Base

Treble

Balance

Osd setup

TV setup

Mute

English,

German,

French,

Language

(待定)

Time out

Transparency

Sleep time

Reset Recall factory setting.

APS Start auto search and auto process

Fine tune Press e/f to adjust the Fine Tune from -50 to 50

Italian,
Spanish,
Portugal,

Holland

Poland

Press e/fto adjust the Mute on or off

Allow you to select a language for all the on-screen menu.

Press e/f to select the Menu Timeout to be 5,10,15,20,25,
30,35,40,45,50,55,60 seconds.

Press e/f to select the Sleep Timer to be 15, 30, 45, 60,
90, 120 minutes or Off.

Add/Erase Allow you to add/remove channels.

11

VGA setup

Channel Name Edit the channel name. (Europe only)

Channel Swap Swap the channel location . (Europe only)

Channel reset

Auto Allows you to auto adjust the display mode.

H-Position

V- Position

Clock

Phase

Allow you to restore a default TV channel table. (TV
only)

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
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

AControls the width of the picture based on the VGA mode.

Allows you to improve focus clarity and image stability
Press VOLUME ( -, +) to adjust the Hue from 0 to 100

12

4. Adjusting Procedure

ITEM Equipments Requirements Procedure and SPEC

‧ Select SOURCE then choose VGA

Color
Temp.Adustment

White balance
adjustment

a. warm Brightness and

VG828/Croma2327
Chroma 7120
(untouchable)

Contrast =>50

1280*800/60 all white

balance

Select the warm to
enter the adjustment
option of R.G.B.

b. standard Brightness and

Contrast =>50

Select the standard to
enter the adjustment
option of R.G.B

c. cool

Brightness and
Contrast =>50

Select the cool to enter
the adjustment option
of R.G.B

TV mode test Factory TV signal or

S-VIDEO adjsutment

TV signal generator

DVD
S-Video Cable

Output PAL signal

Play DVD
Set DVD to interlaced

output

SACRT output test To accept TV signal Send TV signal

through the SCART

‧ Enter the factory area
‧ Select Calibration
‧ Enter Color Temp. to User
‧ Enter User Color temp and adjust the R

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/ m
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/ m
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/ m
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.

Screen is clear and fluent

Screen is clear and fluent

G B offset/gain value

2

2

2

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）

13

Screen is clear and fluent

V

GA INPUT

VGA INPUT

PC
VGA Cable

TV BOX
D-SUB Cable

z Each 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.

z Confirm PC can automated identify the

hd155tpLCD NO.

z Use external-connect TV BOX, watching

the TV program; the screen is clear and
fluent.

z Select SOURCE then choose

S-VIDEO.

z Sending the signal from DVD test disc

(sixth paragraph)

NTSC/PAL Switch

.480P/480i 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

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)

z Switch DVD output mode from

NTSCand PAL, Watch the
screen to check if has switch
NTSC/PAL

z Select SOURCE then choose

Y CBCR/Y PBPR

z Sending the signal from DVD

test disc(sixth paragraph)

z Switch DVD to output mode P-SCN

ON/OFF

z see if there is the action of switch

(480i/480p).

14

.SOUND mode

a. Volume

b. Treble

c. Bass

d.Balance

e.Mute

Pattern Generator
Audio source output
External connect

Left/Right speaker
(2.5/8ohm)

DVD/VCD plays
music or DVD disc

DVD/VCD plays
music or DVD disc

DVD/VCD plays
music or DVD disc

Any Pattern

z Selects SOURCE menu
z Enterthe SOUND adjustment

item.

z Press ▲ /▼ to set audio volume
z Check if the action is normal.

z Press▲ /▼ to set audio volume
z Check if the action is normal.
z The default is”50”
z Press ▲ /▼ to set Bass volume
z Check if the action is normal.
z The default is”50”
z Press ▲ /▼ to set balance
z The default is”50”
z Press ▲ /▼ to set balance
z The default is”off”

Surround Mode

NICAM

Super Freq. test

Remote function test.

.TUNER FLUKE54200

DVD/VCD plays
music or DVD disc

GENERTOR"FLUKE
54200"or approved
equipment

Pattern Generator
VGA Cable
PC
Pattern Generator
TV Signal Generator
DVD or VCD
HDTV Player

15

z Press
z Check if the sound has change
z The default is”OFF”
z Press I-II button on the remote
z Check if the sound has

change.

z Check if OSD displays”super Freq.”

z Check if each function is normal under

each mode

z Selects SOURCE to be TV
z Selects TV SOURCE AIR
z Check if Screen is clear and

fluent

z Selects TV SOURCE CABLE
z Check if Screen is clear and

fluent

to set ON/OFF

5. Trouble Shooting Flow Chart

STEP 1.

No NO No

NO

NO

YES
NO
OK

YES

NO

16

No Display

( Black )

LED ON ?

YES YES

Push the power

ON/OFF switch

NO

LED Color

change ?

Check KEY/ LED

board &J7

OK

A

NG YES

Change AD

Board

C

Check AC
Socket ?

YES YES

LCD TV

ON?

Check the A/D board

tuner U16-Pin3

U16-Pin3

High ?

Check Inverter Power

(24V)of LCD Panel, OK?

B

Change AC Socket

Fuse or power board

Check

Video& Audio

Function

Make sure the
LVDS
connection of
LCD Panel is
fine ?

Display ?

Check Video&

Audio Function

Check the connection

NO

of Signal cable

YES
YES

YES

NO

YES
YES

NO

Change AD Board

Check Video&

Audio Function

A

Display ?

NO

B

U16-PIN5

Active low(Se

e

Panel SPEC.) ?

Change the LCD

Panel

Display ?

Change AD

Board

Change AD Board

Check Video&

Audio Function

17

STEP 2.

NO

NO

OK

No TV,VIDEO

and VGA

Picture

C

Change AD

Board

Check

Video&

Audio

Function

Check

Video&

Audio

Function

OK

STEP 3.

OK OK OK

NG
NG

No Audio

Check

A/D board

J4

Change AD

Check

Speaker

Change Speaker

Check

Video&

Audio

Function

Board or U2

18

6. Exploded Diagram and Spare Parts List

19

U12

HDMI/DVI

HDMI

RGB/Audio L/R

VGA

Composite/Audio L/R

S-video/Audio L/R

Compoment/Audio L/R

VIDEO/AUDIO

Composite /SIF

AV

S-video

YPbPr

SCART

TV

MST97885LD/96885LD

7. Block Diagram

U9

PANEL

1024*768

U2

Audio amp

U8

Earphone

AMP

U7

DDR

20

8. Schematic Diagram

21

22

23

24

25

26

27

28

29

30

9. PCB Layout Diagram

Keypad Board (Component Side Top)

Keypad Board (Component Side Bottom)

IR/LED Board (Component Side Top)

IR/LED Board (Component Side Bottom)

32

Main Board (Component Side Top)

33

Main Board (Component Side buttom)

34