Samsung LHA19PS, 940Fn Service Manual

SERVICE

Manual

LCD Monitor

Fashion Feature

LCD-Monitor

Chassis LHA19PS Model 940Fn

Lustrous/Colorful Appearance(Design)

- Integrated UI applied

- Built-in Scaler Sync Separator

- Connectivity : Analog (15p Dsub),

Dual (24p DVI-D)

- Power Consumption : 38W

- DPMS : under 1 W (230Vac)

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Gyeonggi-Do, Korea, 443-742 Printed in Korea P/N : BN82-00136C-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.

1. Menu button

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

2. MagicBright button

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

For documentations or works involving heavy text.

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

4) Game For watching motion pictures such as a game.

5) Sport For watching motion pictures such as a sport.

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

3. Brightness button

When OSD is not on the screen, push the button to adjust brightness.

2,3. Adjust buttons

Adjust items in the menu.

10 Operating Instructions and Installation

10-1

10 Operating Instructions and Installation

10-1 Front

10 Operating Instructions and Installation

10-2

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 center of the screen displaying the current mode -- analog or digital input signal.) Note : If you select the digital mode, you must connect your monitor to the graphic card's port using the DVI cable.

5. Auto button

Use this button for auto adjustment.

6. Power button

Use this button for turn the monitor on and off.

7. Power indicator

This light glows green during normal operation, and blinks green once as the monitor saves your adjustments.

10-2 Rear

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

1. Power port

Connect the power cord for your monitor to the power port on the back of the monitor.

2. DVI IN port

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

3. RGB IN port

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

4. Power on/off Switch(option)

Use this button for turn the monitor on and off.

5. 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. )

For using a locking device, contact where you purchase it.

1. Connect the power cord 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 'DVI-A to D-sub' Cable to the D-sub port 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 'DVI-A to 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.

10 Operating Instructions and Installation

10-3

10-3 Connecting the monitor

Rear of monitor

Rear of Computer

New Model Macintosh

Old Model Macintosh

[ RGB IN ]

[ DVI IN ]

10 Operating Instructions and Installation

10-4

10-4 Attaching a Base

- This monitor accepts a 75mm x 75mm VESA-compliant mounting interface pad.

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. 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.

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 monitors.

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

these components.

11-1 Disassembly (Simple - Stand)

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

1. Place monitor face down on cushioned table. Remove 3 screws from the stand.

2. Remove stand and front cover.

11 Disassembly and Reassembly

11-2

3. Lift up the back cover and Use the jig to remove the shield lamp.

4. Disconnect cables.

5. Lift up the shield and disconnect LVDS cable.

11 Disassembly and Reassembly

11-3

11-2 Disassembly (HAS-Stand)

6. Lift up the LCD panel.

1. Place monitor face down on cushioned table. Remove 2 screws from the stand and remove front cover.

11 Disassembly and Reassembly

11-4

2. Lift up the back cover and Use the jig to remove the shield lamp.

3. Disconnect cables.

4. Lift up the shield and disconnect LVDS cable.

11 Disassembly and Reassembly

11-5

5. Lift up the LCD panel.

11-3 Reassembly

Reassembly procedures are in the reverse order of disassembly procedures.

11 Disassembly and Reassembly

11-6

Memo

12 PCB Layout

12-1

12 PCB Diagram

12 PCB Layout

12-2

Memo

14 Reference Infomation

14-1

14 Reference Infomation

14-1 Technical Terms

-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 syn-

chronizing HSYNC with Video clock

-Inverter

Device that supply Power to LCD panel lamp. this

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

AC Adapter

Device that converts AC(90V~240V) to DC(+12V or

14V)

SMPS(Switching Mode Power Supply)

Switching Mode Power supply. This design technol-

ogy is used to step up/down the input power by

switching on/off

-FRC(Frame Rate Controller)

Technology that change image frame quantity dis-

played 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 con-

trol phase difference.

-COARSE

This is a adjustment by tuning with Video colck and

PLL clock.

-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 inde-

pendent. this interface is primarily forcused at pro-

viding a connection between a computer and its dis-

play 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 recog-

nize 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

14-2

-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 NonInterlace 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).

14 Reference Infomation

14-3

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

14-2 Pin Assignments

14 Reference Infomation

14-4

Separate Sync

14-3 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

1280/75 Hz 1280x1024

1280/60 Hz 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

fH (kHz)

A μsec

B μsec

C μsec

D μsec

E μsec

fV (Hz)

O msec

P msec

Q msec

R msec

S msec

Clock Freq. (MHz)

Polarity H.Sync

V.Sync

Remark

IBM

640/75 Hz

640x480

800/60 Hz

800x600

800/75 Hz

800x600

1024/60 Hz

1024x768

1024/75 Hz

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 computergenerated video signals.

14 Reference Infomation

14-5

14-4 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 -/-

MAC,1152 x870 68.681 75.062 100.000 -/-

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, 1152 x 864 67.500 75.000 108.00 +/+

VESA 1280 x 960 60.000 60.000 108.00 +/+

VESA, 1280 x 1024 63.981 60.020 108.00 +/+

VESA, 1280 x 1024 79.976 75.025 135.00 +/+

-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

14 Reference Infomation

14-6

14-5 Panel Description

SEC LT140X1-002 BN07-00004A SA BN68-00239H -

SEC LT150XS-L01 BN07-00009A SB -

SEC LT150XS-L01-B BN07-00022A SC -

SEC LTM150XS-L02 BN07-00005A SD -

SEC LT181E2-132 BN07-00001A SE -

SEC LT150XS-T01 BN07-00010A SF -

SEC LTM181E3-132 BN07-00019A SG -

SEC LT170E2-131 BN07-10001D SH -

SEC LT181E2-131 BN07-10001E SJ -

SEC LTM170E4-L01 BN07-00018A SK -

SEC LTM240W1-L01 BN07-00015A SL -

SEC LTM213U3-L01 BN07-00016A SM -

SEC LTM150XH-L01 BN07-00026A SN

SEC LTM150XH-L03 BN07-00027A SP -

SEC LTM150XS-L01 BN07-00032A SQ DELL(ZPD)

SEC LTM181E4-L01 BN07-00034A SR PVA

SEC LTM170EH-L01 BN07-00036A SS TN

SEC LTM170E5-L01 BN07-00037A SU PVA

SEC LTM150XH-L11 BN07-00041A SV -

SEC LTM213U4-L01 BN07-00039A SW PVA

SEC LTM150XH-L01(ZPD) BN07-00045A SX ZPD

SEC LTM150XH-L04 BN07-00046A SY New panel with high brightness

SEC LTM170W1-L01 BN07-00047A SZ Panel for TV

SEC LTM150XH-L06 BN07-00053A EA

Panel for TV/ High luminance for 450cd _ SONY&EOS Team Panel for TV

SEC LTM153W1-L01 BN07-00054A EB Use NIKE MODEL

SEC LTM170EH-L05 BN07-00055A EC Panel EOS proj. for high brightness of 17" EH-L05

SEC LTM170E5-L03 BN07-00056A ED Dell 1702FP pro. E4. EH mechanical Compatible

SEC LTM190E1-L01 BN07-00057A EE DELL 1900 FP

SEC LTM181E5-L01 BN07-00061A EF 18" narrow bezel GH18PS

SEC LTM150XP-L01 BN07-00065A EG AMLCD PVA PANEL

SEC LTM240W1-L02 BN07-00062A EH Panel for 15" Wide TV

SEC LTM170EU-L01 BN07-00071A EJ Slim design, TN

SEC LTM170E5-L04 BN07-00072A EK E5-L04 6 bits FRC... for IBM

SEC LTA220W1-L01 BN07-00074A EL Panel for 22" TV

SEC LTM170E6-L02 BN07-00075A EM AMLCD Narrow & slim design 17" PVA mode

SEC LTM170W1-L01 BN07-00082A EN LTM170W1-L01 ZPD panel

SEC LTM170EH-L01 BN07-00080A EP LTM170EH-L01 ZPD panel

SEC LTM170E5-L01 BN07-00081A EQ LTM170E5-L01 ZPD panel

SEC LTM170EH-L05 BN07-00083A ER LTM170EH-L05 ZPD panel

SEC LTM170E5-L03 BN07-00084A ES LTM170E5-L03 ZPD panel

SEC LTM170EU-L01 BN07-00085A ET LTM170EU-L01 ZPD panel

SEC LTM170E5-L04 BN07-00086A EU LTM170E5-L04 ZPD panel

SEC LTM170E6-L02 BN07-00087A EV LTM170E6-L02 ZPD panel

SEC LTM150XH-L06 BN07-00091A EW Color coordinates change for LCD TV

SEC LTM153W1-L01 BN07-00092A EX AMLCD WIDE 15",9/10

SEC LTM170W1-L01 BN07-00100A EY Color Coordinates change code management

SEC LTM170EH-L05 BN07-00097A EZ LTM170E5-L05 Color Coordinates Change Panel Code

SEC LTA400W1-L01 BN07-00109A S1 PANEL of AMLCD 40" TV

SEC LTM153W1-L01 BN07-00110A S2 Color coordinates change 0.280/0.290, 10000k & ZPD Panel

SEC LTM150XH-L06 BN07-00111A S3 Color coordinates change 0.280/0.290, 10000k & ZPD Panel

SEC LTM170W1-L01 BN07-00112A S4 Color coordinates change 0.280/0.290, 10000k & ZPD Panel

SEC LTM170EH-L05 BN07-00113A S5 Color coordinates change 0.280/0.290, 10000k & ZPD Panel

SEC LTM220W1-L01 BN07-00114A S6 ZPD Panel for AMLCD 22" TV

SEC LTM150XH-L06 BN07-00117A S7 ZPD Panel code

SEC LTM153W1-L01 BN07-00118A S8 ZPD Panel code

SEC LTM170WP-L01 BN07-00119A S9 PVA Panel for NIKE

SEC LTM213U4-L01 BN07-00039A E1 21.3" NARROW

SEC LTA260W1-L01 BN07-00121A E2 VENUS

Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks

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