Samsung LE37S81BX Schematic

TFT-LCD TV

Chassis GJA26SEU

GJA32SEU GJA37SEU GJA40SEU GJA46SEU

Model LE26S81BX

LE26S86BD LE32S81BX LE32S86BD LE37S81BX LE40S81BX LE40S86BD LE46S81BX

Manual

SERVICE

TFT-LCD TV Fashion 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.

LE26S81BX/LE26S86BD/LE32S81BX/LE32S86BD/ LE37S81BX/LE37S86BD/LE40S81BX/LE40S86BD/ LE46S81BX Service Manual

First edition June 2007. Printed in Korea.

Trademarks

Samsung is the registered trademark of Samsung Electronics Co., Ltd. LE26S81BX/LE26S86BD/LE32S81BX/LE32S86BD/ LE37S81BX/LE37S86BD/LE40S81BX/LE40S86BD/ LE46S81BX 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 LE26S81BX/LE26S86BD Specifications ……………………………………………………………………………………………… 2-2

2-3 LE32S81BX/LE32S86BD Specifications ……………………………………………………………………………………………… 2-3

2-4 LE37S81BX Specifications ……………………………………………………………………………………………………………… 2-4

2-5 LE40S81BX/LE40S86BD Specifications ……………………………………………………………………………………………… 2-5

2-6 LE46S81BX Specifications ……………………………………………………………………………………………………………… 2-6

2-7 Spec Comparison ………………………………………………………………………………………………………………………… 2-6

2-8 Option Specification ……………………………………………………………………………………………………………………… 2-7

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 ……………………………………………………………………………………………………………………… 3-12

3-5 Software Upgrade ……………………………………………………………………………………………………………………… 3-15

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 LE26S81BX/LE26S86BD Exploded View ……………………………………………………………………………………………… 5-1

5-2 LE26S81BX/LE26S86BD Parts list……………………………………………………………………………………………………… 5-2

5-3 LE32S81BX/LE32S86BD Exploded View ……………………………………………………………………………………………… 5-3

5-4 LE32S81BX/LE32S86BD Parts list……………………………………………………………………………………………………… 5-4

5-5 LE37S81BX/LE37S86BD Exploded View ……………………………………………………………………………………………… 5-5

5-6 LE37S81BX/LE37S81BX/LE37S86BD Parts list ……………………………………………………………………………………… 5-6

5-7 LE40S81BX/LE40S86BD Exploded View ……………………………………………………………………………………………… 5-7

5-8 LE40S81BX/LE40S86BD Parts list……………………………………………………………………………………………………… 5-8

6. Electrical Parts List

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

66-1

6-1 LE26S81BX/LE26S86BD Parts List …………………………………………………………………………………………………… 6-1

6-2 LE32S81BX/LE32S86BD Parts List …………………………………………………………………………………………………… 6-26

6-3 LE37S81BX/LE37S86BD Parts List …………………………………………………………………………………………………… 6-48

6-4 LE40S81BX/LE40S86BD Parts List …………………………………………………………………………………………………… 6-89

7. Block Diagram

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

77-1

Contents

88. Wiring Diagram

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

88-1

8-1 Wiring Diagram ……………………………………………………………………………………………………………………………8-1

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

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

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

99. Schematic Diagrams

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

99-1

10. O

Operating Instructions and Installation

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

110-1

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

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

10-3 Remote control ………………………………………………………………………………………………………………………… 10-4

10-4 Installing the Stand …………………………………………………………………………………………………………………… 10-5

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

11. Disassembly and Reassembly

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

111-1

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

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

12. PCB Diagram

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

112-1

13. CCircuit 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 …………………………………………………………………………………………………………………………… 14-7

14-4 Panel Description …………………………………………………………………………………………………………………… 14-11

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Gyeonggi-Do, Korea, 443-742 Printed in Korea P/N : BN82-00184A-00 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.

10 Operating Instructions and Installation

10-1

10 Operating Instructions and Installation

10-1 Front

1. SOURCE

Toggles between all the available input sources (TV, Ext.1, Ext.2, AV, S-Video, Component, PC, HDMI1, HDMI2). In the on-screen menu, use this button as you use the

ENTER button on the remote control.

2. MENU

Press to see an on-screen menu of your TV's features. In case of DTV mode, the DTV menu appears.

Press to decrease or increase the volume. In the on-screen menu, use the buttons as you use the and buttons on the remote control.

4. C/P.

Press to change channels. In the on-screen menu, use the C/P. buttons as you use the and buttons on the remote control. (Without the Remote Control, you can turn on the TV by using the Channel buttons.)

5. Speakers

6. (Power)

Press to turn the TV on and off.

Power Indicator

and turns off when the power is on and lights up in stand-by mode. Remote Control Sensor Aim the remote control towards this spot on the TV.

Remote Control Sensor

Aim the remote control towards this spot on the TV.

- The product colour and shape may vary depending on the model.

10-2 Connection Panel

10 Operating Instructions and Installation

10-2

- Whenever you connect an external device to your TV, make sure that power on the unit is turned off.

- When connecting an external device, match the colour of the connection terminal to the cable.

1. Connecting Set-Top Box, VCR or DVD

- Inputs or outputs for external devices, such as VCR, DVD, video game device or video disc players.

Connector

EXT 1 EXT 2

Output

Video + Audio (L/R)

Only TV or DTV output is available.

Output you can choose.

Input

Video Audio (L/R) RGB

10 Operating Instructions and Installation

10-3

2. Connecting AUDIO

Connect RCA audio cables to "R - AUDIO - L" on the rear of your set and the other ends to corresponding audio in connectors on the Amplifier or DVD Home Theater.

3. HDMI IN 1, HDMI IN 2

- Supports connections between HDMI-connection-enabled AV devices (Set-Top Boxes, DVD players).

- No additional Audio connection is needed for an HDMI to HDMI connection. What is HDMI?

- "High Definition Multimedia interface" allows the transmission of high definition digital video data and multiple channels of digital audio ( 5.1 channels).

- The HDMI/DVI terminal supports DVI connection to an extended device with the appropriate cable (not supplied). The difference between HDMI and DVI is that the HDMI device is smaller in size, has the HDCP (High Bandwidth Digital Copy Protection) coding feature installed, and supports multi - channel digital audio.

DVI IN (HDMI IN 2) / (AUDIO R/L)

- When connecting this product via HDMI or DVI to a Set Top Box, DVD Player or Games Console etc, make sure that it has been set to a compatible video output mode as shown in the table below. Failure to observe this may result in picture distortion, image breakup or no picture.

- When using an HDMI/DVI cable connection, it is only possible from the HDMI 2 IN terminal.

You should use the DVI-to-HDMI cable or DVI-HDMI Adapter for the connection, and the "R- AUDIO - L" terminal on DVI for sound output. Supported modes for HDMI/DVI and Component

4. Connecting an Aerial or Cable Television Network

To view television channels correctly, a signal must be received by the set from one of the following sources:

- An outdoor aerial / A cable television network / A satellite network

6. Connecting External A/V Devices

- Connect RCA or S-VIDEO cable to an appropriate external A/V device such as VCR, DVD or Camcorder.

- Connect RCA audio cables to "R - AUDIO - L" on the rear of your set and the other ends to corresponding audio

out connectors on the A/V device.

- Headphone may be connected to the headphone output ( 5 ) on the rear of your set. While the headphone is

connected, the sound from the built-in speakers will be disabled.

7. Connecting Computer

- Connect the D- Sub cable (optional) to "PC (PC IN)" on the rear of your set and the other end to the Video Card of

your computer.

- Connect the stereo audio cable (optional) to "AUDIO (PC IN)" on the rear of your set and the other end to "Audio

Out" of the sound card on your computer.

8. SERVICE

- Service connection for qualified service engineer.

9. Connecting Component Devices (DTV/DVD)

- Connect component video cables (optional) to component connector ("P

R", "PB", "Y") on the rear of your set and

the other ends to corresponding component video out connectors on the DTV or DVD.

- If you wish to connect both the Set-Top Box and DTV (or DVD), you should connect the Set-Top Box to the DTV

(or DVD) and connect the DTV (or DVD) to component connector ("P

R", "PB", "Y") on your set.

- The PR, PB and Y connectors on your component devices (DTV or DVD) are sometimes labeled Y, B-Y and R-Y

or Y, Cb and Cr.

- Connect RCA audio cables (optional) to "R - AUDIO - L" on the rear of your set and the other ends to

corresponding audio out connectors on the DTV or DVD.

- This LCD TV displays its optimum picture resolution in 720p mode.

- This LCD TV displays its maximum picture resolution in 1 080i mode.

10. Kensington Lock

- The Kensington lock (optional) is a device used to physically fix the system when used in a public place.

- If you want to use a locking device, contact the dealer where you purchased the TV.

- The place of the Kensington Lock may be different depending on its model.

480i 480p 576i 576p 720p 1080i HDMI/DVI 50Hz X X X O O O HDMI/DVI 60Hz X O X X O O

Component O O O O O O

10 Operating Instructions and Installation

10-4

The performance of the remote control may be affected by bright light. This is a special remote contro for the visually impaired, and has Braille points on the Power, Channel and Volume buttons.

10-3 Remote Control

1. Television Standby button

2. Number buttons for direct channel access

3. One/Two-digit channel selection

4. Selects the TV mode directly

5. Used to display Channel Lists on the screen.

6. Volume increase Volume decrease

7. Temporary sound switch-off

8. Menu display and change confirmation

9. Sound mode selection

10.Returns to the previous menu.

11.Picture effect selection

12.Adjusts screen brightness to save energy.

13.Sound effect selection

14.SRS TSXT selection

15.Available source selection

16.Previous channel

17.Selects the HDMI mode directly.

18.omatic Power-off

19.P : Next channel

P : Previous channel

20.Exit the OSD

21.Control the cursor in the menu

22.

Use to see information on the current broadcast

23.Picture freeze

25.Picture size selection

26.PIP:Picture-In-Picture On / Off

SOURCE: Input source selection POSITION: PIP position selection P : Next channel P : Previous channel

Tteletext Functions

4. Exit from the teletext display

8. Teletext index

15.Teletext mode selection (LIST/FLOF)

16.Teletext sub pag

19.P : Teletext next page

P : Teletext previous page

20.Teletext cancel

22.Teletext reveal

24.Alternately select Teletext, Double, or Mix.

9. 11. 23. 25 Fastext topic selection

26.PIP: Teletext Hold

SOURCE: Teletext Store POSITION: Teletext size selection

10 Operating Instructions and Installation

10-5

10-4 Installing the Stand

1. Place the TV fdown on a soft cloth or cushion on a table.

2. Put the stand into the hole at the bottom of the TV.

3. Insert screw into the hole indicated and tighten. The stand is installed for models with the screen size of 40 inch and above.

10-5 Installing the Wall Mount Kit

Wall mount items (sold separately) allow you to mount the TV on the wall. For detailed information on installing the wall mount, see the instructions provided with the Wall Mount items. Contact a technician for assistance when installing the wall mounted bracket. Samsung Electronics is not responsible for any damage to the product or injury to yourself or others if you elect to install the TV on your own.

Remove the stand and cover the bottom hole with a cap and fasten with two screws.

<2> <3>

Memo

10 Operating Instructions and Installation

10-6

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.

Description Picture Description

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

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 cable from the boards.

11 Disassembly and Reassembly

11-4

7. Remove 5 secews from the BRKT. Lift up the BRKT.

Description Description Picture

6. Remove screws and Lift up the Lcd panel.

11 Disassembly and Reassembly

11-5

Description Description Picture

11-2 Reassembly

Reassembly procedures are in the reverse order of disassembly procedures.

11 Disassembly and Reassembly

11-6

Memo

12 PCB Diagram

12-1

12 PCB Diagram

12-1-1 26", 32", 37", 40", 46" Main PCB Diagram

12 PCB Diagram

12-2

12-2-2 26", 32", 37", 40", 46" Main PCB Diagram

12 PCB Diagram

12-3

12-3 26, 32" SMPS

12 PCB Diagram

12-4

12-4 37" SMPS

12 PCB Diagram

12-5

12-5 40" SMPS

12 PCB Diagram

12-6

12-6 46" SMPS

13 Circuit Descriptions

13-1

13 Circuit Descriptions

13-1 Block description

RF IN

Scart 1,2

A/V

S-Video

Component

HDMI 1, 2

Main

Board

Panel T-con

Board

Speaker

IR/LED

Signal Power

Bordeaux consists of three main blocks

1. Main board : Video signal processing

2. IP board : Power supply & Inverter

3. T-con board : LCD Panel control

IP Board

13 Circuit Descriptions

13-2

Bordeaux consists of three main blocks

1. Main board : Video signal processing

2. SMPS : Power supply

3. T-con board : LCD Panel control

SMPS

INVERTER

RF IN

Scart 1,2

A/V

S-Video

Component

HDMI 1, 2

Main

Board

Panel T-con

Board

Speaker

IR/LED

Signal Power

13 Circuit Descriptions

13-3

13-2 Main Block

13 Circuit Descriptions

13-4

13-3 SMPS Board

13-3-1 26", 32" Power Block

13-3-2 26", 32" SMPS Diagram

Line

Filter

Part

PFC

Switching

Part

Resonance

Switching

Part

Resonance

Transformer

Output

Rectifier

Part

DC/DC SI-8008HFE or AP1501A

Inverter

SMPS

24V

Signal

5.3V

Signal

13V

Sound

12V

Stand-By

5.2V

Regulator

KA278R12

Resonance

Controller MC33067

PFC Controler TDA4863

Stand-By

Controller

STR-A6159

AC Input

(90Vac~264Vac)

Rectifier

PFC

Rectifier

On/Off

Control

On/Off

EMI

FILTER

AC Input

90V~264V

INPUT

Rectifier

MC33067

STR-A6159

Current

Resonant Type

450V

150uF

TDA4863

PFC DC Output

Trans EER4445

Trans EE2020

PFC

Regulator

Sound

+12V

V5D

+5.3V

Stand-By

5.2V

INVERTER

24V

Main

+13V

DC/DC

Converter

On/Off

Control

Power On/Off

Signal

ST-BY

Transformer

Output

Rectifier

Part

13 Circuit Descriptions

13-5

Output

Name

Output Voltage Output Current

Load Characteristics PCB Loc.

Usage Remark

Normal

24.5V

5.3V

12.7V

9.2V

8.0V

0.1V

0.01V

0.1V

4.0V

5.0V

0.5V

1.1V

0.6V

Pulsating Main B'D Drive -

Sound

Stand-by

Drive, Logic,

Buffer,

Image Digital

Image Analog

Main B'D

Constant

3.0V

0.3V

23.52V

~25.48V

5.13V

~5.67V

11.9V

~13.7V

8.83V

~9.57V

5.58V ~8.5V

Min Typical PeakRegulation(%) Variable Range

24V

13V

Vamp

ST-BY

5.3V

13 Circuit Descriptions

13-6

13-3-5 37" Power Block

13-3-6 37" SMPS Diagram

Line

Filter

Part

PFC

Switching

Part

Resonance

Switching

Part

Resonance

Transformer

Output

Rectifier

Part

DC/DC

MC33167

DC/DC

LM2576

Inverter

SMPS

24V

Signal

5.3V

Signal

13V

Sound

12V

Stand-By

5.2V

Regulator

KA278R12

Resonance

Controller

F9222L

PFC

Controler TDA4863

Stand-By

Controller

Viper22A

AC Input

(90Vac~264Vac)

Rectifier

PFC

Rectifier

On/Off

Control

On/Off

EMI

FILTER

AC Input

90V~264V

INPUT

Rectifier

F9222L

Viper22A

Current

Resonant Type

450V

150uF

TDA4863

PFC DC Output

Trans EER4445

Trans EE2020

PFC

Regulator

DC/DC

Converter

Sound

+12V / +9V

V5D

+5.3V

Stand-By

5.2V

INVERTER

24V

Main

+13V

DC/DC

Converter

On/Off

Control

Power On/Off

Signal

ST-BY

Transformer

Output

Rectifier

Part

13 Circuit Descriptions

13-7

13-3-7 40, 46" IP Board

13-3-8 40, 46" IP Board

Power

Input

(AC90V

~264V)

EMI Filter

Rectifier

Feedback Protection

FWM

CONTROLLER

Stand-by

CONTROLLER

(Switch)

FWM

CONTROLLER

VCC

On/Off

Opto-

coupler

13.0V / 0.4A

12.0V / 2.5A

5.4V / 43.5A

6.2V / 0.4A

Rectifier

SWITCHING

TRANSFORMER

RFC

(switching,

Inductor)

Power

Input

(380V)

Resonant

Balance

Board

Voltage / Current /

LAMP /

Detection

LAMP

SWITCHING

Feedback

CONTROLLER

Opto-Coupler

UVLO

Gate

DRIVE

Opto-Coupler /

Pulse-

Transformer

ON/OFF

DIM

TRANSFORMER

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