Samsung 193P, DI19PS Service Manual

TFT-LCD MONITOR

Chassis Model DI19PS 193P

SERVICE

Manual

TFT-LCD MONITOR CONTENTS

1. Precautions

2. Product Specifications

3. Disassembly & Reassembly

4. Alignment & Adjustments

5. Troubleshooting

6. Exploded View & Parts List

7. Electrical Parts List

8. Block Diagram

9. Wiring Diagram

10. PCB Layout

11. Schematic Diagrams

12. Panel Description

1 Precautions

DEVICE UNDER TEST

TEST ALL

EXPOSED METAL

SURFACES

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE CURRENT

TESTER

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

EARTH

GROUND

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

1-1 Safety Precautions

1-1-1 Warnings

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

2. Disconnect the AC power and DC Power Jack before servicing.

3. When the chassis is operating, semiconductor heatsinks are potential shock hazards.

1-1-2 Servicing the LCD Monitor

1. When servicing the LCD Monitor, remove the static charge by connecting a 10k ohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead. (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 resistor-capacitor 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).

4. With the unit completely reassembled, plug the AC

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special safety-related 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

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.

Figure 1-1. Leakage Current Test Circuit

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.

on schematics and parts lists. A substitute

DI19PS 1-1

1 Precautions

1-2 Servicing 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.

1-2-1 General Servicing 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.

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.

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. 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 wriststrap 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.

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.

1-2 DI19PS

2 Product Specifications

2-1 Specifications

Item

LCD Panel TFT-LCD panel, RGB vertical stripe, normaly black, 19-Inch viewable,

0.294 mm pixel pitch

Scanning Frequency Horizontal : 30 kHz ~ 81kHz (Automatic)

Vertical : 56 Hz ~ 75 Hz (Automatic)

Display Colors 16.7 Million colors

Maximum Resolution Horizontal : 1280 Pixels Vertical : 1024 Pixels

Input Video Signal Analog, 0.7 Vp-p ± 1% positive at 75 Ω, internally terminated, Digital, TMDS

Input Sync Signal Type : Seperate H/V sync, Composite H/V, Sync-on-Green (option), automatic

synchronization without external switch of sync type

Level : TTL level

Maximum Pixel Clock rate 135 MHz

Active Display (H / V) 376.32 (H)mm / 301.056 (V)mm

AC power voltage & Frequency AC 100 ~ 240 VAC ( + / - 10%), 60 / 50 Hz ~ ± 3 Hz

Power Consumption 40 W (MAX)

Dimensions(W x D x H) Set 16.7 x 1.7 x 13.8 Inches (423 x 44.2 x 351.5 mm)

16.7 x 9.3 x 16.2 Inches (423 x 236.2 x 412.7 mm) State of stand installed

16.7 x 4.1 x 13.8 Inches (423 x 103 x 351.5 mm) State of stand folded

Package 20.6 x 17.8 x 7.2 Inches (524 x 453 x 183 mm)

Description

Weight Set 7.1 kg (15.7 lbs) Package 9.4 kg (20.7 lbs)

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

Operating Humidity : 10 % ~ 80 % Storage Temperature : 13 °F to 113 °F (-25 °C ~ 45 °C) Storage Humidity : 5 % ~ 95 %

•Designs and specifications are subject to change without prior notice.

DI19PS

2-1

2 Product Specifications

2-2 Pin Assignments

Pin No.

10 11 12 13 14 15

Sync Type

Separate Composite Sync-on-green (Option)

1 2 3 4 5 6 7 8 9

Red Green Blue GND GND (DDC Return) GND-R GND-G GND-B No Connection GND-Sync/Self Test GND DDC Data H-Sync V-Sync DDC Data

15-Pin Signal Cable Connector

Red Green Blue GND GND (DDC Return) GND-R GND-G GND-B No Connection GND-Sync/Self Test GND DDC Data H/V-Sync Not Used DDC Data

Red Green + H/V Sync Blue GND GND (DDC Return) GND-R GND-G GND-B Not Used GND-Sync/Self Test GND DDC Data Not Used Not Used DDC Data

Pin No.

Sync Type

Rx2-

Rx2+

GND

No Connection

DDC Clock (SCL)

DDC Data (SDA)

Rx1-

Rx1+

No Connection

24P DVI-D

No Connection

+5V_M

Self Raster

+5V_M

Rx0-

Rx0+

No Connection

RxC+

RxC-

2-2 DI19PS

2 Product Specifications

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

VIDEO

Horizontal

Vertical

2-3 Timing Chart

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

Table 2-1 Timing Chart

Timing

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 Frequency (MHz)

Mode

VGA1/70 Hz

640 x 350

31.469

31.778

3.813

1.589

26.058

0.318

70.086

14.268

0.064

1.716

11.504

0.985

25.175

IBM

VGA2/70 Hz

720 x 400

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

VGA3/60 Hz

640 x 480

31.469

31.778

3.813

1.589

26.058

0.318

59.940

16.683

0.064

0.794

15.761

0.064

25.175

640/72 Hz

640 x 480

37.861

26.413

1.270

3.810

20.825

0.508

72.809

13.735

0.079

0.528

13.100

0.026

31.500

640/75 Hz

640 x 480

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

VESA

800/56 Hz

800 x 600

35.156

28.444

2.000

3.556

22.222

0.667

56.250

17.778

0.057

0.626

17.067

0.028

36.000

800/60 Hz

800 x 600

37.879

26.400

3.200

2.200

20.000

1.000

60.317

16.579

0.106

0.607

15.840

0.026

40.000

DI19PS

Polarity H.Sync

V.Sync

Remark

Video

C D

Sync

Positive

Negative

Separate

Separate Sync

Negative

Positive

Separate

Video

Q R S

Sync

Negative

Separate

Negative

Separate

Negative

Separate

Positive

Negative

Separate

Positive

Separate

H/V Composite Sync

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

2-3

2 Product Specifications

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

VIDEO

Horizontal

Vertical

Table 2-2 Timing Chart

Timing

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)

Mode

VGA2/

70 Hz

720 x 400

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

IBM

VGA3/

60 Hz

640 x 480

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

640/75 Hz

640 x 480

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

800/60 Hz

800 x 600

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

800/75 Hz

800 x 600

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

VESA

1024/60 Hz

1024 x 768

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

1024/75 Hz

1024 x 768

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

1280/60 Hz

1280 x 1024

(Analog)

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

1280/75 Hz

1280 x 1024

(Analog)

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

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

Polarity H.Sync

V.Sync

Remark

Video

C D

Sync

Negative

Positive

Separate

Negative

Separate

Separate Sync

Negative

Separate

Video

Q R S

Sync

Positive

Separate

Positive

Separate

Negative

Separate

Positive

Separate

Positive

Separate

Positive

Separate

H/V Composite Sync

2-4 DI19PS

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the DI19PS monitor.

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

these components.

3-1 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.

3. R/Cover opening jig : BH81-00001A

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

2. Disconnect cable and remove 4 screws from the stand.

3. Lift up the stand and insert the opening drive into the grooves at each side and press until it clicks.

4. Disconnect function cable and remove 12 screws from the shield.

5. Remove the cover front and remove 4 screws from the panel.

DI19PS 3-1

3 Disassembly and Reassembly

6. Remove shield from the panel and disconnect inverter cabel, LVDS cable from the main boards.

7. Remove main board from the panel.

3-2 Replacement Order of Lamp Assemblies

1. After confirm there is nothing on the desk, turn the LCD module over and put it on a flat desk set to the ground.

2. Remove 2 screws for the lamp unit.

3-2 DI19PS

Slide the lamp unit

3 Disassembly and Reassembly

3. Slide the lamp unit. Please take out the lamp units from the LCD module.

4. Please fix the new lamp units on the LCD module : opposite process 2 and 3.

3-3 Reassembly

Reassembly procedures are in the reverse order of disassembly procedures.

DI19PS 3-3

3 Disassembly and Reassembly

Memo

3-4 DI19PS

4 Alignments and Adjustments

This is to illustrate jig installation required for DDC EDID input. DDC EDID input is necessary to adjust black level and R, G, B for FPD when replacing AD board. This section also explains how to adjust OSD when replacing panel or lamp.

4-1 Required Equipment

The following equipment is required for monitor adjustment

• Computer with Windows 95, Windows 98, or NT

• MTI-2031 DDC Manager Jig

4-2 Automatic Color Adjustment

Use 16-grey or black and white pattern for video input.

1. With the monitor powered off, press power key and hold until it beeps 10 times.

2. Power the monitor on for screend display.

3. Press the power key and hold until the following figure displays.

Figure 4-1.

4. Press power key and hold until Auto Color is selected.

5. Press power key again to execute Auto Color.

4-3 DDC EDID Data Input

1. Input DDC EDID data when replacing AD PCB.

2. Receive/Download the proper DDC file for the model from HQ quality control department. Install the below jig (Figure 4-3) and enter the data.

DI19PS

Figure 4-2.

4-1

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