BBK LT3709S Service manual

SUBJECT:
( )

JL321/371/401-XP2

Service Manual

( )

MODEL NO:JL321/371/401-XP2
( )

DOC.NO:
( )

EFFECTIVE DATE:
( )

REVISION: A1
( )

PAGE 1 OF 49
REVISION STATUS

( )

PAGE

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
…
49

REV.

A1
A1

A1

A1

A1

A1
A1

A1

A1
A1
A1
A1

A1

A1
A1
A1
A1

A1

A1
A1
A1
A1
A1

COPY TO All CONTENTS

( )

APPROVED BY/

REVIEWED BY/

PREPARED BY/

CONCURRED BY/

RD

RD

LT3709S

Service Manual

1

TABLE OF CONTENTS

1. Precautions and Safety Notices ································· 4

2. Specification ················································· 5

3. Front Panel Function Control Description ························· 10

4. Adjusting Procedure ········································· 16

5. Trouble Shooting Flow Chart ·································· 19

6. Exploded Diagram and Spare Parts List ·························· 22

7. Block and Schematic Diagrams ············································25

8. PCB Layout Diagrams ·········································44

2

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.

3

2. Specification

JL321 panel specification:

Item Specifications
Display pixels 1366 (H) x 768 (V) pixels ( 1 pixel = 1 RGB cells )

Display Area 714.96mm (H) x 404.6mm (V)

Pixel Pitch 0.1730mm (H) x 0.5190mm (V)

Display Colors 16.77M

Pixel Arrangement R+G+B vertical stripe

Brightness 550cd/m2 typical

Contrast Ratio

1200:1 typical at CR ≧ 10

Viewing Angle 176 (H)/ 176(V) Typical

Color Chromaticity (CIE) White: x = 0.285 , y = 0.293

Frame Rate 50/60Hz

Response Time 6.5ms typical

Surface Treatment

Anti-Glare coating(Haze 25%),Hard coating(3H)

Anti-reflective coating＜2% reflecting

JL371 panel specification:

Item Specifications
Panel Name AUO

Panel Model No. T370XW01

Display pixels

1366 (H) x 768 (V) pixels ( 1 pixel = 1 RGB cells )

Display Area 819.36mm (H) x 460.89mm (V)

Pixel Pitch 0.6mm

Display Colors 16.7M

Pixel Arrangement R+G+B vertical stripe

Brightness 500cd/m2 typical

Contrast Ratio

1000:1 typical at CR ≧ 10

Viewing Angle 176 (H)/ 176(V) Typical

Color Chromaticity (CIE) White: X = 0.280 ± 3% , Y = 0.290 ± 3%

Response Time 8ms (Gray to Gray)

Surface Treatment Hard-Coating (3H), Anti-Glare, Reflectance < 2%

JL401 panel specification:

Item Specifications
Panel Name Samsung

4

Panel Model No. LTA400W2-L01

Display pixels

1366 (H) x 768 (V) pixels ( 1 pixel = 1 RGB cells )

Display Area

Pixel Pitch

885.168mm (H) x 497.664mm (V)

0.648 (H) x 0.216 (W)

Display Colors 16.7M

Pixel Arrangement R+G+B vertical stripe

Brightness 500cd/m2 typical

Contrast Ratio

800:1 typical at CR ≧ 10

Viewing Angle ±85° (H), ±85°(V) Typical

Color Chromaticity (CIE)

White: X = 0.280 , Y = 0.290 typical

Response Time 10ms

Surface Treatment Hard-Coating (3H)

INPUT Source :

Signals Video Format

Outputs

TV Analog TV PAL IEC Type TV

VIDEO1 Video + L/R Audio +

CVBS RCA

Earphone Out

VIDEO2 Video + L/R Audio CVBS RCA

SCART1 Audio L/R in/out, CVBS

in/out, S-Video, RGB

SCART2 Audio L/R in/out, CVBS in,

S-Video, RGB

YPbPr Component

(Y, Pb/Cb, Pr/Cr)

Scart 21Pin VIDEO3

(Scart1)

Scart 21Pin

480i, 480p, 720p,
1080i

VIDEO4
(Scart2)

RCA

+ L/R Audio

HDMI1 HDMI Digital RGB +Digital

HDMI 19 Pin HDMI1

Audio

Connector types Inputs &

SCART1

SCART2

YPbPr

5

HDMI2 HDMI Digital RGB +Digital

Audio

HDMI 19 Pin HDMI2

VGA

AUDIO

VGA+ L/R Earphone

L/R Audio RCA STEREO

Analog RGB D-SUB 15 Pin VGA

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

Note:

A. SCART connector

B. HMDI connector is a type A receptacle for video/audio mode.

6

1. TMDS Data 2+ 9. TMDS Data 0- 17. CEC/GND

2. TMDS Data 2 shield 10. Clock + 18. +5V Power

3. TMDS Data 2- 11. Clock shield 19. Hot Plug Detect

4. TMDS Data 1+ 12. Clock -

5. TMDS Data 1 shield 13. CEC

6. TMDS Data 1- 14. NC

7. TMDS Data 0+ 15. DDC CLK

8. TMDS Data 0 shield 16. DDC DATA

C. D-Sub Connector IN. (This function also can provides to HDTV.)

D-Sub type Connector pin assignment

1. Red Video 6. Red Ground 11. GND

2. Green Video 7. Green Ground 12. SDA For DDC1/2B

3. Blue Video 8. Blue Ground 13. H-sync.

4. GND 9. +5V from PC 14. V-sync.

5. Vdd from PC for DDC 10. Sync. GND 15. SCL For DDC1/2B

D. RCA jacks are all female type.

E. Mini DIN CNC 4 Pins (SCN570S3NS00000) for S-video, the pin assignment is

described as below:

Format

Level/Impedance

TMDS Mode

Frequency Fh = 31~80 kHz

Maximum Pixel Clock

DDC 1/2B

DVI 1.0

0.5~3.0Vp-p/100 Ohm (Differential),50 Ohm (Single ending)

Single Link

Fv = 56~76 Hz
135 MHz

Compliant with Revision 1.0

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

HDMI

7

Connector

HDMI x 1

Analog HD15 PC Signal (RGB)

Format

Level/Impedance

DDC 1/2B

R, G, B Analog

0.7Vp-p / 75

Compliant with Revision 1.0

Sync H/V separate

3V TTL level / 1k

Frequency Fh = 31~80 kHz

Fv = 50~75 Hz

Maximum Pixel Clock

Connector

135 Mhz

Mini D-Sub 15 pin (female) x 1

Video (Composite) CVBS Signal

Format

Level / Impedance

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

1.0Vp-p / 75

S-Video (Y/C) Signal

Format

Y, C

Level / Impedance Y: 1.0Vp-p / 75

C: ± 286 mV/ 75

Analog HD15 Video Signal (YPbPr/YCbCr)

Format

Y, Pb, Pr or Y, Cb, Cr

Level / Impedance Y: 1.0Vp-p / 75

Pb/Cb, Pr/Cr: 0.7 ± 0.035Vp-p / 75

HDMI Timing

STANDARD RESOLUTION

V FREQ

Hz

H FREQ

kHz

CLK

MHz

ATSC, 480i 720x480 60 15.7 27

ATSC, 480p 720x480 60 31.5 27

ATSC, 1080i 1920x1080 60 33.7 74.2

ATSC, 720p 1280x720 60 45.0 74.2

ATSC, 576i 720x576 50 15.6 27

RGB PC Timing

STANDARD RESOLUTION

V FREQ

Hz

H FREQ

kHz

CLK

MHz

VGA 640x480 60 31.47 25.16

VGA 640x480 75 37.5 31.5

SVGA 800x600 60 37.88 40

SVGA 800x600 75 46.9 49.5

XGA 1024x768 60 48.36 65.0

XGA 1024x768 75 60.02 78.75

SXGA 1280x1024 60 64 108

SXGA 1280x1024 75 80 135

MAC 640x480 67 35 30.24

Non-VESA 720x400 70 31.5 28

8

Video & S-Video AV Timing

t

y

STANDARD RESOLUTION

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

PAL-M 525 60 15.734 12.65

PAL-N 625 50 15.625 14.50

HDTV/Component AV Timing

SDTV 525i 720x525 60 15.735 27

SDTV 625i 720x625 50 15.625 27

SDTV 480p 720x480 60 31.5 27

HDTV 720p 1280x720 60 50.0 74.2

HDTV 1080i 1920x1080 60 33.7 74.2

Power Source

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

AC100 – 240 V, 60/50 Hz

V FREQ

Hz

H FREQ

kHz

CLK

MHz

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.

9

3. Front Panel Function Control Description

Operation, Adjust and Programming

10

11

12

13

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

Menu Options Sub-Options Function and Description

AUDIO

VIDEO

SETUP

Picture Mode

Contrast 0…100 (80) Fine tune the contrast.
Brightness 0…100 (50) Fine tune the Bright
Auto Setting (only

for VGA)

Phase (only for
VGA)

Saturation 0…100 (70) Fine tune the Saturation.
Hue -30…+30 (0) Fine tune the Hue
Sharpness 0…7 (4) Fine tune the Sharpness
Manual Clock (only

for VGA)
Display

Adjustment (only
for VGA)

Color Temperature

Noise Reduction Strong→Middle→

Bass 0…100 (50) Fine tune the bass value.
Treble 0…100 (50) Fine tune the treble value.
Balance -50…+50 (0) Fine tune the balance value.
Sound Effect

Parental

Language English/French/Ara

Vivid →Standard

Cinema →
Sport→→User.

Press OK button Press OK button to automatically adjust the

0…100 Control the signal phase to improve focus

Control the width of the picture based on the

H Position Adjust the position of the picture left and

V Position Adjust the position of the picture up and

Cool

Nature

Warm
User Red/Green/Blue: 0…255

Low→Off

Surround

Live
Dance
Techno
Classic
Soft
Rock
POP
Off Close this function.

Channel Lock Press buttons to select the channel you

Videl Lock Press buttons to select the input video

Change
Password

bic/Russian/Italian/
Portuguese/Turkish
/Persian

Press repeatedly for different picture modes:
Vivid →High-Bright Cinema Sport →→→User.

display setting to optimize performance
based on the VGA mode.

clarity and image stability based on the VGA
mode.

VGA.

right in the window.

down in the window.
Set the color temperature type.

→Middle→Low→Off

Strong

Select the preset effec mode to match your
music type and achieve stunning effects.

want to lock.

you want to lock.
Press OK button to display the password

confirm menu. And use 0-9 keys to enter a
new four-digit password, and then confirm
the new password by entering it again.

Set on-the-screen language.

14