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/

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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

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8

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