Samsung LA26R71B Schematic

TFT-LCD TV

Chassis Model GBD26KS LA26R71B GBD32KS LA32R71B GBD40KS LA40R71B GBD32KS LA32R71W

Manual

SERVICE

TFT-LCD TV Feature

- Luxurious Slim Design

- Supreme Picture Quality

- Supreme Sound Quality

- Supreme Convenience Quality

- Convenience for Users

photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of Samsung Electronics Co., Ltd.

LA26R71B / LA32R71B / LA40R71B / LA32R71W Service Manual

First edition March 2006. Printed in Korea.

Trademarks

Samsung is the registered trademark of Samsung Electronics Co., Ltd. LA26R71B / LA32R71B / LA40R71B / LA32R71W and Macmaster Cable Adapter are trademarks of Samsung Electronics Co., Ltd.

Macintosh and Power Macintosh are trademarks of Apple Computer, Inc.

All other trademarks are the property of their respective owners.

Contents

11. Precautions

………………………………………………………………………………………………………………………………………

11-1

1-1 Safety Precautions ……………………………………………………………………………………………………………………… 1-1

1-2 Servicing Precautions …………………………………………………………………………………………………………………… 1-2

1-3 Static Electricity Precautions …………………………………………………………………………………………………………… 1-2

1-4 Installation Precautions…………………………………………………………………………………………………………………… 1-3

2. Product specifications

…………………………………………………………………………………………………………………………

22-1

2-1 Fashion Feature…………………………………………………………………………………………………………………………… 2-1

2-2 LA26R71B Specifications………………………………………………………………………………………………………………… 2-2

2-3 LA32R71B / LA32R71W Specifications ………………………………………………………………………………………………… 2-3

2-4 LA40R71B Specifications………………………………………………………………………………………………………………… 2-4

2-5 Spec Comparison ………………………………………………………………………………………………………………………… 2-5

2-6 Option Specification ……………………………………………………………………………………………………………………… 2-6

3. Alignments and Adjustments

…………………………………………………………………………………………………………………

33-1

3-1 Service Instruction ……………………………………………………………………………………………………………………… 3-1

3-2 How to Access Service Mode …………………………………………………………………………………………………………… 3-2

3-3 Factory Data ……………………………………………………………………………………………………………………………… 3-3

3-4 Service Adjustment ……………………………………………………………………………………………………………………… 3-9

3-5 Software Upgrade ……………………………………………………………………………………………………………………… 3-12

4. Troubleshooting

………………………………………………………………………………………………………………………………

44-1

4-1 First Checklist for Troubleshooting ………………………………………………………………………………………………………4-1

4-2 Checkpoints by Error Mode ……………………………………………………………………………………………………………… 4-2

5. Exploded View and Parts List

…………………………………………………………………………………………………………………

55-1

5-1 LA26R71B Exploded View ……………………………………………………………………………………………………………… 5-1

5-2 LA26R71B Parts list ……………………………………………………………………………………………………………………… 5-2

5-3 LA32R71B Exploded View ……………………………………………………………………………………………………………… 5-3

5-4 LA32R71B Parts list ……………………………………………………………………………………………………………………… 5-4

5-5 LA32R71W Parts list ……………………………………………………………………………………………………………………… 5-4

5-6 LA40R71B Exploded View ……………………………………………………………………………………………………………… 5-5

5-7 LA40R71B Parts list ……………………………………………………………………………………………………………………… 5-6

Electrical Parts List

……………………………………………………………………………………………………………………………

6-1

6-1 LA26R71B Parts List……………………………………………………………………………………………………………………… 6-1

6-2 LA32R71B Parts List …………………………………………………………………………………………………………………… 6-19

6-3 LA40R71B Parts List …………………………………………………………………………………………………………………… 6-35

6-4 LA32R71W Parts List …………………………………………………………………………………………………………………… 6-52

7. Block Diagram

…………………………………………………………………………………………………………………………………

77-1

Contents

88. Wiring Diagram

…………………………………………………………………………………………………………………………………

88-1

8-1 LA26R71B / LA32R71B / LA40R71B / LA32R71W Wiring Diagram………………………………………………………………… 8-1

8-2 Main Board Layout ……………………………………………………………………………………………………………………… 8-2

8-3 PIN characteristic ………………………………………………………………………………………………………………………… 8-3

8-4 Power Board Layout ……………………………………………………………………………………………………………………… 8-6

9. Schematic Diagrams

……………………………………………………………………………………………………………………………

99-1

9-1 Power_Sound Schematic Diagram ……………………………………………………………………………………………………… 9-1

9-2 Jack Schematic Diagram ………………………………………………………………………………………………………………… 9-2

9-3 Micom Schematic Diagram ……………………………………………………………………………………………………………… 9-3

9-4 SVP-PX/PX-Power/LBE-Option Schematic Diagram ………………………………………………………………………………… 9-4

9-5 Application Schematic Diagram ………………………………………………………………………………………………………… 9-5

10. Operating Instructions and Installation

………………………………………………………………………………………………………

110-1

10-1 Front …………………………………………………………………………………………………………………………………… 10-1

10-2 Connection Panel ……………………………………………………………………………………………………………………… 10-2

10-3 Remote control ………………………………………………………………………………………………………………………… 10-5

10-4 Installing the Stand …………………………………………………………………………………………………………………… 10-6

10-5 Installing the Wall Mount Kit ………………………………………………………………………………………………………… 10-6

11. Disassembly and Reassembly

………………………………………………………………………………………………………………

111-1

11-1 Disassembly …………………………………………………………………………………………………………………………… 11-1

11-2 Reassembly …………………………………………………………………………………………………………………………… 11-5

12. PCB Diagram

…………………………………………………………………………………………………………………………………

112-1

12-1 26" Main PCB Diagram ……………………………………………………………………………………………………………… 12-1

12-2 32", 40" Main PCB Diagram ……………………………………………………………………………………………………………12-2

12-3 26" SMPS board ……………………………………………………………………………………………………………………… 12-3

12-4 32" SMPS board ……………………………………………………………………………………………………………………… 12-4

12-5 40" IP Board …………………………………………………………………………………………………………………………… 12-5

13. Circuit Descriptions

……………………………………………………………………………………………………………………………

113-1

13-1 Block description ……………………………………………………………………………………………………………………… 13-1

13-2 Main Block ……………………………………………………………………………………………………………………………… 13-3

13-3 SMPS Board …………………………………………………………………………………………………………………………… 13-4

14. Reference Infomation

………………………………………………………………………………………………………………………

114-1

14-1 Technical Terms ……………………………………………………………………………………………………………………… 14-1

14-2 Pin Assignments ……………………………………………………………………………………………………………………… 14-4

14-3 Timing Chart …………………………………………………………………………………………………………………………… 14-6

14-4 Panel Description …………………………………………………………………………………………………………………… 14-10

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Gyeonggi-Do, Korea, 443-742 Printed in Korea P/N : BN82-00139H-01 URL : http://itself.sec.samsung.co.kr/

- This Service Manual is a property of Samsung Electronics Co., Ltd. Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

2 Product Specifications

2-1

2 Product specifications

2-1 Fashion Feature

Supreme Digital Interface & Networking

-With a built-in HD digital tuner, it supports HD broadcasting with no particular set-top box and provides simple access with a single remote control.

Excellent Picture Quality

-DNIe technology provides life-like clear images.

Dynamic Contrast

-Automatically detects the input visual signal and adjusts to create optimum contrast.

Energy saving

-Adjusts the brightness of TV so as to reduce the power consumption.

SRS TruSurround XT

-SRS TruSurround XT provides a virtual Dolby surround system.

Convenience

-The TV utilizes the HDMI system to implement perfect digital sound and picture quality.

2-2 LA26R71B / LA26R71W Specifications

° ° ° °

2 Product Specifications

2-2

Item

Description

2 Product Specifications

2-3

2-3 LA32R71B / LA32R71W Specifications

LCD Panel

TFT-LCD panel, RGB vertical stripe, normaly white, 32-Inch viewable, 0.511 (H) x 0.511 (V) mm pixel pitchh

Scanning Frequency Horizontal : 30 kHz ~ 61 kHz (Automatic) / Vertical : 60 Hz ~ 75 Hz (Automatic) Display Colors 16,777,216 colours Maximum Resolution Horizontal : 1360 Pixels

Vertical : 768 Pixels

Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75

, internally terminated

Input Sync Signal Type : Seperate H/V

Level : TTL level

Maximum Pixel Clock rate

80 MHz

Active Display Horizontal/Vertical 556.4 mm / 339.8 mm

AC power voltage & Frequency AC 110 ~ 240V, 60 / 50 Hz

Power Consumption 152 W Dimensions(W x D x H)

Set 800 x 252 x 602.5 mm(31.5 x 9.92 x 23.72 inches)After installation Stand

800 x 79.6 x 564 mm(31.5 x 3.13 x 22.20 inches) Without stand

Weight Set

(After installation Stand) 14.8 kg (32.62 lbs)

TV System Tunning Frequency Synthesize

System PAL, SECAM, NTSC-M Sound MONO, STEREO, NICAM

Environmental Operating Temperature : 50°F ~ 104°F (10°C ~ 40°C) Considerations Operating Humidity : 10 % ~ 80 %

Storage Temperature : -4°F ~ 113°F (-20°C ~ 45°C) Storage Humidity : 5 % ~ 95 %

Antena Input 75

-MAX Internal speaker Out : Right : 10W / Left : 10W

-BASS Control Range : -8 dB ~ + 8dB

Sound Characteristic -TREBLE Control Range : -8 dB ~ +8 dB

-Headphone Out : 10 mW MAX

-Output Frequency : RF : 80 Hz ~ 15 kHz A/V : 80 Hz ~ 20 kHz

Item

Description

2 Product Specifications

2-4

2-4 LA40R71B Specifications

LCD Panel

TFT-LCD panel, RGB vertical stripe, normaly white, 40-Inch viewable, 0.648(H) x 0.216(V) mm pixel pitch

Scanning Frequency Horizontal : 30 kHz ~ 61 kHz (Automatic) / Vertical : 60 Hz ~ 75 Hz (Automatic) Display Colors 16,777,216 colours Maximum Resolution Horizontal : 1360 Pixels

Vertical : 768 Pixels

Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75

, internally terminated

Input Sync Signal Type : Seperate H/V

Level : TTL level

Maximum Pixel Clock rate

80 MHz

Active Display Horizontal/Vertical 556.4 mm / 339.8 mm

AC power voltage & Frequency AC 110 ~ 240V, 60 / 50 Hz

Power Consumption 205 W Dimensions(W x D x H)

Set

1004 x 330 x 749 mm(39.52 x 12.99 x 29.49 inches) After installation Stand 31004 x 115 x 680 mm(39.52 x 4.52 x 26.77 inches) Without stand

Weight Set

(After installation Stand) 30.2 kg (66.58 lbs)

TV System Tunning Frequency Synthesize

System PAL, SECAM, NTSC-M Sound MONO, STEREO, NICAM

Environmental Considerations Operating Temperature : 50°F ~ 104°F (10°C ~ 40°C)

Operating Humidity : 10 % ~ 80 % Storage Temperature : -4°F ~ 113°F (-20°C ~ 45°C) Storage Humidity : 5 % ~ 95 %

Antena Input 75

-MAX Internal speaker Out : Right : 10W / Left : 10W

-BASS Control Range : -8 dB ~ + 8dB

Sound Characteristic -TREBLE Control Range : -8 dB ~ +8 dB

-Headphone Out : 10 mW MAX

-Output Frequency : RF : 80 Hz ~ 15 kHz A/V : 80 Hz ~ 20 kHz

Item

Description

2-5 Spec Comparison

2 Product Specifications

2-5

LA26R51B / LA32R51B / LA40R51B

Model

Design

Frequency

Horizontal Vertical Display Color

30 ~ 61 kHz

60 ~ 75 Hz

16,777,216 colors

30 ~ 61 kHz

60 ~ 75 Hz

16,777,216 colors

PC Resolution

Maximum mode

Input Signal

Sync Signal Video Signal

Power Consumption

Normal Power Saving

140W / 184W / 285W

< 1W

100W / 152W / 205W

< 1W

H/V Separate, TTL, P. or N.

0.7 Vp-p @ 75ohm

H/V Separate, TTL, P. or N.

0.7 Vp-p @ 75ohm

WXGA, 1360 x 768 @ 60 Hz WXGA, 1360 x 768 @ 60 Hz

LA26R71B / LA26R71W / LA32R71B /

LA40R71B / LA32R71W

2 Product Specifications

2-6

2-6 Option Specification

Item Item Name

Remote Control

Batteries (AAA x 2)

Power Cord

Cleaning Cloth

Owner's

Instructions

Stand

Cover-Bottom

BN59-00507A

3903-000067

BN63-001798A

BN68-01010A

26" : BN90-00848A 32" : BN90-00842A 40" : BN90-00847A

26" : BN63-02323A 32" : BN63-02323A 40" : BN63-02366A

Code.No Remark

5 Exploded View & Parts List

5-1

5 Exploded View and Parts List

- You can search for updated part codes through ITSELF web site.

URL : http://itself.sec.samsung.co.kr/

5-1 LA26R71B Exploded View

M0014

M0013

T0175

T0159

T0447

M0215

T0175

M0013

T0003

5 Exploded View & Parts List

5-2

Location Code.No Item & Specification Q'ty SA/SNA Remark

T0003 BN96-03012F ASSY COVER P-FRONT;26R71,SO,ABS+PMMA,HB, 1 SA

T0175 BN96-03053A ASSY SPEAKER P;16ohm,Bordeuax 26,Left,5W 1 SA

T0175 BN96-03054A ASSY SPEAKER P;16ohm,Bordeuax 26,Right,5 1 SA

M0215 BN07-00254A LCD-PANEL;T260XW02,8bit,626.0*373.0*50.0 1 SA

T0447 BN96-03008C ASSY BRACKET P-PANEL;BORDEAUX,26,AUO,SMP 1 SNA

M0014 BN94-00879A ASSY PCB MAIN;LA26R71B,BORDEAUX,ASIA 1 SA

T0159 BN96-03058A ASSY PCB P-SMPS;Bordeaux 26 PFC,LE26R71B 1 SA

M0013 BN96-03014E ASSY COVER P-REAR;26R71,SO,ABS+PMMA,BK23 1 SA

M0013 BN96-03017A ASSY STAND P-BASE;26R71,ABS+PMMA,HB,BK23 1 SA

5-2 LA26R71B Parts list

5 Exploded View & Parts List

5-3

5-3 LA26R71W Exploded View

M0014

M0013

T0175

T0159

T0447

M0215

T0175

M0013

T0003

5 Exploded View & Parts List

5-4

Location Code.No Item & Specification Q'ty SA/SNA Remark

T0003 BN96-03012P ASSY COVER P-FRONT;26R71,SO,(WHITE),ABS+ 1 S.A

T0175 BN96-03053A ASSY SPEAKER P;16ohm,Bordeuax 26,Left,5W 1 S.A

T0175 BN96-03054A ASSY SPEAKER P;16ohm,Bordeuax 26,Right,5 1 S.A

M0215 BN07-00254A LCD-PANEL;T260XW02,8bit,626.0*373.0*50.0 1 S.A

T0447 BN96-03008C ASSY BRACKET P-PANEL;BORDEAUX,26,AUO,SMP 1 S.N.A

M0014 BN94-00879B ASSY PCB MAIN;LA26R71BX/* 1 S.N.A

T0159 BN96-03058A ASSY PCB P-SMPS;Bordeaux 26 PFC,LE26R71B 1 S.A

M0013 BN96-03014L ASSY COVER P-REAR;26R71,SO(WHITE),ABS+PM 1 S.A

M0013 BN96-03017B ASSY STAND P-BASE;26R71,ABS+PMMA,HB,WH12 1 S.A

5-4 LA26R71W Parts list

5 Exploded View & Parts List

5-5

5-5 LA32R71B / LA32R71W Exploded View

M0014

M0013

T0175

T0447

M0215

T0175

T0003

M0013

5 Exploded View & Parts List

5-6

5-6 LA32R71B Parts list

Location Code.No Item & Specification Q'ty SA/SNA Remark

T0003 BN96-02996D ASSY COVER P-FRONT;32R71,SO,ABS+PMMA,HB, 1 SA

T0175 BN96-03002A ASSY SPEAKER P;8ohm,Bordeuax 32"/37"/40" 1 SA

T0175 BN96-03003A ASSY SPEAKER P;8ohm,Bordeuax 32"/37"/40" 1 SA

M0215 BN07-00247A LCD-PANEL;LTA320WT-L14,8BIT,760*450*50.0 1 SA

T0447 BN96-02999A ASSY BRACKET P-PANEL;BORDEAUX,32,AMLCD,S 1 SNA

M0014 BN94-00876A ASSY PCB MAIN;LA32R71B,BORDEAUX,ASIA 1 SA

M0013 BN96-02997D ASSY COVER P-REAR;32R71,SO,ABS+PMMA,HB,B 1 SA

M0013 BN96-02998A ASSY STAND P-BASE;32R71,ABS+PMMA,HB,BK23 1 SA

5-7 LA32R71W Parts list

Location Code.No Item & Specification Q'ty SA/SNA Remark

T0003 BN96-03677E ASSY COVER P-FRONT;32R71,SO(WHITE,AM),AB 1 S.A

T0175 BN96-04207A ASSY SPEAKER P;8ohm,VE Type,Left,10W,Hor 1 S.N.A

T0175 BN96-04208A ASSY SPEAKER P;8ohm,VE Type,Right,10W,Ho 1 S.A

M0215 BN07-00247A LCD-PANEL;LTA320WT-L14,-,8BIT,760*450*50 1 S.A

T0447 BN96-02999A ASSY BRACKET P-PANEL;BORDEAUX,32,AMLCD,S 1 S.N.A

M0014 BN94-00876B ASSY PCB MAIN;LA32R71BX/* 1 S.A

M0013 BN96-02998B ASSY STAND P-BASE;32R71,-,ABS+PMMA,HB,WH 1 S.A

M0013 BN96-02997M ASSY COVER P-REAR;32R71,SO(WHITE),ABS+PM 1 S.A

5 Exploded View & Parts List

5-7

5-8 LA40R71B Exploded View

M0014

M0013

T0101

T0175

T0447

M0215

T0175

T0003

M0013

5 Exploded View & Parts List

5-8

5-9 LA40R71B Parts list

Location Code.No Item & Specification Q'ty SA/SNA Remark

T0003 BN96-03011D ASSY COVER P-FRONT;40R71,SO,ABS+PMMA,HB, 1 SA

T0175 BN96-03002A ASSY SPEAKER P;8ohm,Bordeuax 32"/37"/40" 1 SA

T0175 BN96-03003A ASSY SPEAKER P;8ohm,Bordeuax 32"/37"/40" 1 SA

M0215 BN07-00264A LCD-PANEL;LTA400WT-L01,8bit,952*551*51.0 1 SA

T0447 BN96-03009C ASSY BRACKET P-PANEL;BORDEAUX,40,AMLCD,I 1 SNA

M0014 BN94-00880A ASSY PCB MAIN;LA40R71BX,BORDEAUX,ASIA 1 SA

T0101 BN61-02427A BRACKET-WALL;BORDEAUX 40,SECC,T1.2 1 SNA

M0013 BN96-03013D ASSY COVER P-REAR;40R71,SO,ABS+PMMA,HB,B 1 SA

M0013 BN96-03016A ASSY STAND P-BASE;40R71,ABS+PMMA,HB,BK23 1 SA

11 Disassembly and Reassembly

11-1

11 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the TFT-LCD TV.

WARNING : This monitor contains electrostatically sensitive devices. Use caution when

handling these components.

11-1 Disassembly

Cautions : 1. Disconnect the monitor from the power source before disassembly.

2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.

1. Place monitor face down on cushioned table. Remove 15 screws from the rear cover. Remove 4 screws from the stand.

Description Picture Description

11 Disassembly and Reassembly

11-2

3. Remove screws from the stand BRKT and lift up the stand BRKT.

Description Picture Description

2. Lift up the rear cover and remove the stand.

11 Disassembly and Reassembly

11-3

5. Remove screws from the boards and lift up the boards.

Description Picture Description

4. Disonnect cables from the boards.

11 Disassembly and Reassembly

11-4

7. Lift up the panel BRKT.

Description Picture Description

6. Remove screw from the side connector. Remove screws from the panel BRKT.

11 Disassembly and Reassembly

11-5

Description Picture Description

8. Lift up the LCD panel.

11-2 Reassembly

Reassembly procedures are in the reverse order of disassembly procedures.

11 Disassembly and Reassembly

11-6

Memo

4 Troubleshooting

4-1

4 Troubleshooting

4-1 First Checklist for Troubleshooting

1. Check the various cable connections first.

- Check to see if there is a burnt or damaged cable.

- Check to see if there is a disconnected cable connection or a connection is too loose.

- Check to see if the cables are connected according to the connection diagram.

2. Check the power input to the Main Board.

3. Check the voltage in and out between the SMPS Main Board, between the SMPS INVERTER Board, and between the Main LVDS Boards.

4 Troubleshooting

4-2

4-2-1 No Power

4-2 Checkpoints by Error Mode

Does proper DC 12V

appear at CN800?

Change a Assy PCB Power.

Yes

Check a connection a power cable.

Does proper DC A3.3V,

A5V appear at

C854, C866?

Check a IC809, IC802.

Change a main PCB ass'y.

Yes

Does proper DC 5V, 3.3V,

1.8V appear at C811, C853, C833?

Check a IC803, IC805, IC813, IC307.

Change a main PCB ass'y

Yes

A power is supplied to set?

Check a other function.

(No picture part)

Replace a lcd panel.

LAMP off, power indicator

LED red color?

4 Troubleshooting

4-3

4-2-2 No Video (Analog PC)

Check a PC source and check

the connection of DSUB cable?

Input a analog PC signal and

connected cable(DPMS).

Yes

Does the signal appear at

#30, 22, 38(R, G, B) of IC500?

PC cable. Change a PC

cable. Change a main PCB ass'y.

Yes

Power Indicator is off.

Lamp on, no video.

Does the digital data appear

at the output of

LVDS (R563_OP~R572_OP)?

Check a IC500

Change a main PCB ass'y.

Yes

Check a LVDS cable?

Replace a lcd panel?

Please, Call to Samsung Co. LTD.

Yes

4 Troubleshooting

4-4

WAVEFORMS

R,G,B Output Signal of IC500

4 Troubleshooting

4-5

4-2-3 No Video (Digital-HDMI)

Check the connection

of HDMI cable?

Input a HDMI cable.

Yes

Does the digital data appear at

R503~R510?

Check a a IC 500

Change a main PCB ass'y.

Yes

Does the digital data

appear at output of IC500

LVDS(R563_OP~R572_OP)?

Check a IC500

Change a main PCB ass'y.

Yes

Check a LVDS cable?

Replace lcd panel?

Please, Call to Samsung Co. LTD.

Yes

Power Indicator is off.

Lamp on, no video.

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