Samsung 214T, LS21BRBS Service Manual

SERVICE

Manual

LCD Monitor

Fashion Feature

LCD-Monitor

Chassis LS21BRBS Model 214T

- Applying MFM UI

- Applying Magic Color Pro

- Applying HDCP / PIP

- Supporting Magic Tune 4.0

- Supporting Analog / Digital / Video / S-video

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Gyeonggi-Do, Korea, 443-742 Printed in Korea P/N : BN82-00133T-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. MENU button [ ]

- Opens the OSD menu. Also use to exit the OSD menu or return to the previous menu.

2,3. Adjust buttons

- This buttons allow you to adjust items in the menu.

Analog/Digital(PC), MagicBright¢â button

[ ]

- MagicBright¢â is a new feature providing the optimum viewing environment depending on the contents of the image you are watching. Currently four different modes are available: Custom, Entertain, Internet, and Text. Each mode has its own pre-configured brightness value. You can easily select one of four settings by simply pressing MagicBright¢â control buttons.

1) Custom Although the values are carefully chosen by our engineers, the pre-configured values may not be comfortable to your eyes depending on your taste. If this is the case, adjust the brightness and contrast by using the OSD menu.

2) Entertain : High brightness For watching motion pictures such as a DVD or Video CD.

3) Internet : Medium brightness For working with a mixture of images such as text and graphics.

4) Text : Normal brightness For documentations or works involving heavy text.

Digital(DVD)/Video/S-Video Mode button

- The Monitor has four automatic picture settings ("Dynamic", "Standard", "Movie" and "Custom") that are preset at the factory. You can activate either Dynamic, Standard, Movie, or Custom. You can select "Custom" which automatically recalls your personalized picture settings.

1) Dynamic Select this mode to view a sharper image than in "Standard" mode.

2) Standard Select this mode when the surroundings are bright. This also provides a sharp image.

3) Movie Select this mode when the surroundings are dark. This will save power and reduce eye fatigue.

10 Operating Instructions and Installation

10-2

POWER S/W

: Switch the monitor on and off.

POWER IN

: Power cord, plugs into monitor and wall receptacle.

10-2 Rear

4) Custom Select this mode when you want to adjust the image according to your preferences.

3. Brightness button [ ]

- When OSD is not on the screen, push the button

to adjust brightness.

4. Enter button [ ] / SOURCE button

- Activates a highlighted menu item. / Push the 'SOURCE', then selects the video signal while the OSD is off. (When the source button is pressed to change the input mode, a message appears in the upper left of the screen displaying the current mode -- Analog, Digital, Video and SVideo input signal.) Note : Changing the source is allowed only in external devices that are connected to the monitor at the time.

5. AUTO button (Available in analog mode only)

- When the 'AUTO' button is pressed, the Auto Adjustment screen appears as shown in the animated screen on the center. Auto adjustment allows the monitor to self-adjust to the incoming video signal. The values of fine, coarse and position are adjusted automatically.

6. PIP button ( Available in Analog/Digital(PC) Mode Only )

- In Analog or Digital Mode, turns on Video screens in PIP Mode.

7. Power button

- Use this button for turn the monitor on and off.

8. Power Indicator

- This will enable you to see the overall power status of the system.

10 Operating Instructions and Installation

10-3

D-sub 15-pin port

:Connect the signal cable to the 15-pin, D-sub

connector on the back of your monitor.

VIDEO / S-VIDEO

- VIDEO

: External device (video) input terminal

- S-VIDEO

: External device (S-video) input terminal

Kensington Lock

: The Kensington lock is a device used to physically fix

the system when using it in a public place. (The locking device has to be purchased separately.)

DVI port (Source : Digital)

: Connect the DVI cable to the DVI port on the back of

your monitor.

10 Operating Instructions and Installation

10-4

- Stand Height Adjustment

1. Press the top side of the stand and then push the button at the rear bottom of the stand.

2. You can adjust the stand height using this button.

When you are using a stand height as maximum , it will go down a little bit from spring elasticity.

- Pivot Stand

10 Operating Instructions and Installation

10-5

10-3-2 Attaching a Base

10-3 Using the Stand

10-3-1 Removing the base

1. Turn off your monitor and unplug its power cord.

2. Lay the LCD monitor face-down on a flat surface with a cushion beneath it to protect the screen.

3. Remove four screws(A) and then remove the Stand from the LCD monitor.

- This monitor accepts a 100mm x 100mm VESA-compliant mounting interface pad.

10 Operating Instructions and Installation

10-6

A. Monitor

B. Mounting interface pad

1. Turn off your monitor and unplug its power cord.

2. Lay the LCD monitor face-down on a flat surface with a cushion beneath it to protect the screen.

3. Remove four screws and then remove the stand from the LCD monitor.

4. Align the mounting interface Pad with the holes in the rear cover mounting pad and secure it with four screws that came with the arm-type base, wall mount hanger or other base.

12 PCB Daigram

12-1

12 PCB Diagram

CM_LVDS

SCALER

D-SUB CONNECTOR

DVI CONNECTOR

LVDS CONNECTOR

Input Voltage

CONNECTOR

Flash

Memory

DDR

Memory

Video

Decoder

1.8V Reg

2.5V Reg

EEPROM

C-VIDEO CONNECTOR

S-VIDEO CONNECTOR

Function CONNECTOR

3.3V Reg

Reg

MICOM

12 PCB Diagram

12-2

Memo

1 Precautions

1-1

1-1-1 Warnings

1. For continued safety, do not attempt to modify the circuit board.

2. Disconnect the AC power and DC power jack before servicing.

1-1-2

Ser vicing the LCD Monitor

1. When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.

2. It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of this meter periodically.

1-1-3 Fire and Shock Hazard

Before returning the monitor to the user, perform the following safety checks:

1. Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.

2. Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.

3. Leakage Current Hot Check (Figure 1-1):

WARNING : Do not use an isolation

transformer during this test.

Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410,

59.7).

Figure 1-1. Leakage Current Test Circuit

4. With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and

repeat the test.

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by on schematics and parts lists. A substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire and/or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.

1 Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock.

1-1 Safety Precautions

1 Precautions

1-2

1-2-1 General Ser vicing

Precautions

1. Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before attempting to: (a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect a test component in parallel with an electrolytic capacitor.

2. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

3. After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the area around the serviced part has not been damaged.

1. Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the monitor.

2. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.

3. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs.

4. Use only a grounded-tip soldering iron to solder or desolder ESDs.

5. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ESDs.

4. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

5. Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500 V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.

6. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.

6. Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

7. Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution:Be sure no power is applied to the

chassis or circuit and observe all other safety precautions.

8. Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting your foot from a carpeted floor can generate enough static electricity to damage an ESD.

1-3

Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some field-effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1-2 Ser vicing Precautions

WARNING: An electrolytic capacitor installed with the wrong polarity might explode. Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions section

of this manual.

Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety

precautions, always follow the safety precautions.

1 Precautions

1-3

1-4 Installation Precautions

1. For safety reasons, more than two people are required for carrying the product.

2. Keep the power cord away from any heat emitting devices, as a melted covering may cause fire or electric shock.

3. Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal temperature may cause fire.

4. Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed to moisture. Otherwise, it may cause a fire or electric shock.

5. Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause fire or electric shock.

6. Keep the antenna far away from any high-voltage cables and install it firmly. Contact with the highvoltage cable or the antenna falling over may cause fire or electric shock.

7. When installing the product, leave enough space (10cm) between the product and the wall for ventilation purposes. A rise in temperature within the product may cause fire.

1 Precautions

1-4

Memo

13 Circuit Descriptions

13-1

13 Circuit Descriptions

13-1 Block description

13 Circuit Descriptions

13-2

13-2 Block operating

No Feature Description

Scaler Integrate ADC and TMDS, Scaling part

Color management IC This chip has Color adjust for color weakness , gamma adjustment, gray level color temperature compensation function

DDR memory Save frame information that SCALER needed

This chip receives video signal from the source and decodes signal to scaler needed

-.MCU recognize angle through the sensor and rotate OSD

-.Magic tune3.6 receive Basic information from MCU and rotate screen through the Pivot soft ware

Microcontroller Micom control all function of monitor

Scaler

CM_LVDS

DDR

MEMORY

VIDEO

DECODER

Pivot sensor

Flash memory save information that MICOM needed Program update is possible through the Firmware

FLASH

MEMORY

MICOM

- TFT-LCD (Thin film Transistor Liquid Crystal Display)

ADC(Analog to Digital Converter)

This is a circuit that converts from analog signal to

digital signals.

- PLL(Phase Locked Loop)

During progressing ADC, Device makes clock

synchronizing HSYNC with Video clock

- Inverter

Device that supply Power to LCD panel lamp. this

device gernerate about 1,500~2,000V.

- SMPS(Switching Mode Power Supply)

Switching Mode Power supply. This design

technology is used to step up/down the input

power by switching on/off

- FRC(Frame Rate Controller)

Technology that change image frame quantity

displayed on screen for one second.

Actually TFT-LCD panel require 60 pcs of frame

for one second.

so,this technology is needed to convert input

image to 60 pcs regardless input frame quantity.

- Image Scaler

Technology that convert various input resolution to

other resolution.(ex. 640* 480 to 1024*768)

- Auto Configuration(Auto adjustment)

This is an algorithm to adjust monitor to optimum

condition by pushing one key.

- OSD(On Screen Display)

On screen display. customer can control the

screen easily with this.

- Image Lock

This means "Fineness adjustment" in LCD

Monitor, the features are "Fine" and "Coarse"

- FINE

"Fine" adjustment is used to adjust visibility by

control phase difference.

- COARSE

This is a adjustment by tuning with Video colck

and PLL clock.

- DVI (Digital Visual Interface)

This provides a high speed digital connection for

visual data types that is display technology

independent. this interface is primarily forcused at

providing a connection between a computer and

its display device.

- L.V.D.S.(Low Voltage Differential Signaling)

a kind of transmission method for Digital.

It can be used from Main PBA to Panel.

- DVI (Digital Visual Interface)

This provides a high speed digital connection for

visual data types that is display technology

independent. this interface is primarily forcused at

providing a connection between a computer and its

display device.

- T.M.D.S (Transition minimized Differential Signaling)

a kind of transmission method for Digital.

It can be used from Video card to Main PBA.

- DDC(Display data channel)

It is a communication method between Host

Computer and related equipment.

It can make it Plug and Play between PC and

Monitor.

- EDID

Extended Display Identification Data PC can

recognize the monitor information as Product data,

Product name,Display mode,Serial number and

Signal source,etc through DDC Line

communicating

with PC and Monitor.

14 Reference Infomation

14-1

14 Reference Infomation

14-1 Technical Terms

14 Reference Infomation

14-2

- Dot Pitch

The image on a monitor is composed of red, green and blue dots. The closer the dots, the higher the resolution. The distance between two dots of the same color is called the 'Dot Pitch'. Unit: mm

- Vertical Frequency

The screen must be redrawn several times per second in order to create and display an image for the user. The frequency of this repetition per second is called Vertical Frequency or Refresh Rate. Unit: Hz Example: If the same light repeats itself 60 times per second, this is regarded as 60 Hz.

- Horizontal Frequency

The time to scan one line connecting the right edge to the left edge of the screen horizontally is called Horizontal Cycle. The inverse number of the Horizontal Cycle is called Horizontal Frequency. Unit: kHz

- Interlace and Non-Interlace Methods

Showing the horizontal lines of the screen from the top to the bottom in order is called the Non-Interlace method while showing odd lines and then even lines in turn is called the Interlace method. The Non-Interlace method is used for the majority of monitors to ensure a clear image. The Interlace method is the same as that used in TVs.

- Plug & Play

This is a function that provides the best quality screen for the user by allowing the computer and the monitor to exchange information automatically. This monitor follows the international standard VESA DDC for the Plug & Play function.

- Resolution

The number of horizontal and vertical dots used to compose the screen image is called 'resolution'. This number shows the accuracy of the display. High resolution is good for performing multiple tasks as more image information can be shown on the screen.

Example: If the resolution is 1280 x 1024 , this

means the screen is composed of 1280 horizontal dots (horizontal resolution) and 1024 vertical lines (vertical resolution).

- S-Video

Short for "Super Video." S-Video allows up to 800 lines of horizontal resolution, enabling high-quality video.

- External Device Input

External device input refers to video input from such external video devices as VCRs, camcorders and DVD players, separate from a TV broadcast.

- DVD

A type of digital disk technology that takes up only the benefits of CD and LD, to implement a high resolution/quality, which enables the user to enjoy clearer images.

14 Reference Infomation

14-3

1. Connect the DC adapter for your monitor to the power port on the back of the monitor.

Plug the power cord for the monitor into a nearby outlet.

2-1. Using the D-sub (Analog) connector on the video card.

Connect the signal cable to the 15-pin, D-sub connector on the back of your monitor.

2-2. Using the DVI (Digital) connector on the video card.

Connect the DVI cable to the DVI port on the back of your monitor.

2-3. Connected to a Macintosh.

Connect the monitor to the Macintosh computer using the D-SUB connection cable.

2-4. In the case of an old model Macintosh, you need to connect the monitor using a special Mac adapter.

3. Turn on your computer and monitor. If your monitor displays an image, installation is complete.

- You may get a blank screen depending on the type of video card you are using, if you connect

simultaneously both the D-Sub and DVI cables to one computer.

- If you properly connect your monitor using the DVI connector but get a blank screen, check to see if

the monitor status is set to analog. Press power button to have the monitor double-check the input

signal source.

14 Reference Infomation

14-4

14-2 Connecting to Other devices

- This monitor allows the user to connect it to such input devices as a DVD player, a VCR or a camcorder

without disconnecting the PC.

- The configuration at the back of the monitor may vary from product to product.

1) Connecting AV Devices

- The monitor has AV connection terminals to connect AV input devices like DVD, VCR or Camcorder.

You may enjoy AV signals as long as the monitor is turned on.

1. Input devices such as DVD, VCR or Camcorder are connected to the C-Video or S-Video terminal of the

monitor using the C-Video or S-Video cable.

2. Then, start the DVD, VCR or Camcorder with a DVD disc or tape inserted.

3. Select Video or S-Video using the Source List .

2) Connecting Digital DVD

- The monitor has DVI connection terminals to connect DVI input devices digital DVD.

DInput devices such as digital DVD is connected to the DVI terminal of the monitor

using the DVI cable.

2. Then, start the DVD with a DVD disc inserted.

3. Select Digital using the SOURCE button.

14 Reference Infomation

14-5

Sync Type

Pin No.

15-Pin D-Sub Signal Cable Connector

Separate Composite

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

Red Green Blue GND DDC Return (GND) GND-R GND-G GND-B DDC Power Input (+5V) Self Raster GND Bi-Dr Data (SDA) H-Sync. V-Sync. DDC Clock (SCL)

Red Green Blue GND DDC Return (GND) GND-R GND-G GND-B DDC Power Input (+5V) Self Raster GND Bi-Dr Data (SDA) H/V-Sync. Not Used DDC Clock (SCL)

Red Green + H/V Sync. Blue GND DDC Return (GND) GND-R GND-G GND-B DDC Power Input (+5V) Self Raster GND Bi-Dr Data (SDA) Not Used Not Used DDC Clock (SCL)

Sync-on-green

No Connection

+5V_M

Self Raster

+5V_M

Rx0-

Rx0+

No Connection

RxC+

RxC-

Rx2-

Rx2+

GND

No Connection

DDC Clock (SCL)

DDC Data (SDA)

Rx1-

Rx1+

No Connection

Sync Type

Pin No.

24P DVI-D

14-3 Pin Assignments

14 Reference Infomation

14-6

Separate Sync

14-4 Timing Chart

C D

Video

Sync

Video

Q R S

A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width

C : Back porch D : Active time Q : Back porch R : Active time

E : Front porch S : Front porch

H/V Composite Sync

Sync-on-Green

79.975

12.504

1.067

1.837

9.481

0.119

75.025

13.329

0.038

0.475

12.804

0.013

135.000

Positive

Separate

1280/75Hz 1280x1024

75.000

13.333

1.185

1.877

9.877

0.395

60.000

16.667

0.040

0.613

16.000

0.013

162.000

Positive

Separate

1600/60Hz 1600x1200

1280/60Hz 1280x1024

63.981

11.852

1.037

2.296

9.259

0.000

60.020

16.005

0.047

0.594

15.630

0.016

108.000

Positive

Separate

31.469

31.777

3.813

1.589

26.058

0.318

70.087

14.268

0.064

0.858

13.155

0.191

28.322

Negative

Positive

Separate

IBM

640/75 Hz

640x480

800/60 Hz

800x600

800/75 Hz

800x600

1024/60Hz

1024x768

1024/75Hz

1024x768

VGA2/

70 Hz

720 x 400

VGA3/

60 Hz

640 x 480

Table 2-1 Timing Chart

31.469

31.778

3.813

1.589

26.058

0.318

59.940

16.683

0.064

0.794

15.761

0.064

26.175

Negative

Separate

37.500

26.667

2.032

3.810

20.317

0.508

75.000

13.333

0.080

0.427

12.800

0.027

31.500

Negative

Separate

37.879

26.400

3.200

2.200

20.000

0.000

60.317

16.579

0.106

0.607

15.840

0.0261

40.000

Positive

Separate

46.875

21.333

1.616

3.232

16.162

0.323

75.000

13.333

0.064

0.448

12.800

0.021

49.500

Positive

Separate

48.363

20.677

2.092

2.462

15.754

0.369

60.004

16.666

0.124

0.600

15.880

0.062

75.000

Negative

Separate

60.023

16.660

1.219

2.235

13.003

0.203

75.029

13.328

0.050

0.466

12.795

0.017

78.750

Positive

Separate

Mode

VESA

Timing

- This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals.

14 Reference Infomation

14-7

14-5 Preset Timing Modes

Sync Polarity

(H/V)

Pixel Clock

(MHz)

Vertical Frequency

(Hz)

Horizontal Frequency

(kHz)

Display Mode

MAC, 640 x 480 35.000 66.667 30.240 -/-

MAC, 832 x 624 49.726 74.551 57.284 -/-

IBM, 640 x 350 31.469 70.086 25.175 +/-

IBM, 640 x 480 31.469 59.940 25.175 -/-

IBM, 720 x 400 31.469 70.087 28.322 -/+

VESA, 640 x 480 37.500 75.000 31.500 -/-

VESA, 640 x 480 37.861 72.809 31.500 -/-

VESA, 800 x 600 35.156 56.250 36.000 +,-/+,-

VESA, 800 x 600 37.879 60.317 40.000 +/+

VESA, 800 x 600 46.875 75.000 49.500 +/+

VESA, 800 x 600 48.077 72.188 50.000 +/+

VESA, 1024 x 768 48.363 60.004 65.000 -/-

VESA, 1024 x 768 56.476 70.069 75.000 -/-

VESA, 1024 x 768 60.023 75.029 78.750 +/+

VESA, 1280 x 1024 63.981 60.020 108.00 +/+

VESA, 1280 x 1024 79,976 75,025 135,00 +/+

VESA, 1600 x 1200 75.000 60.000 162.00 +/+

- If the signal transferred from the computer is the same as the following Preset Timing Modes, the screen

will be adjusted automatically. However, if the signal differs, the screen may go blank while the power LED

is on. Refer to the video card manual and adjust the screen as follows.

Table 1. Preset Timing

Horizontal Frequency

The time to scan one line connecting the right edge to the left edge of the screen horizontally is called Horizontal Cycle and the inverse number of the Horizontal Cycle is called Horizontal Frequency. Unit: kHz

Vertical Frequency

Like a fluorescent lamp, the screen has to repeat the same image many times per second to display an image to the user. The frequency of this repetition is called Vertical Frequency or Refresh Rate. Unit: Hz

+ 53 hidden pages