Samsung 172N, 192N User Manual

TFT-LCD MONITOR

Chassis Model NB17A* 172N NB19A* 192N

Manual

SERVICE

TFT-LCD MONITOR CONTENTS

1. Precautions

2. Product Specifications

3. Disassembly & Reassembly

4. Alignments & 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

NB17A*

NB19A*

NB17A*/NB19A* 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 Servicing 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 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).

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 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

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

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

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.

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.

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 Precautions

1-2 NB17A*/NB19A*

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 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.

2 Product Specifications

2-1 Specifications

LCD Panel

TFT-LCD panel, RGB vertical stripe, normally black transmissive, TFT-LCD panel, RGB vertical stripe, normally black transmissive, 17-Inch viewable, 0.264 (H) x 0.264 (V) mm pixel pitch 19-Inch viewable, 0.298 (H) x 0.298(V) mm pixel pitch

Scanning Frequency Horizontal : 31 kHz ~ 81 kHz (Automatic) Horizontal : 31 kHz ~ 81 kHz (Automatic)

Vertical : 56 Hz ~ 75 Hz Vertical : 56 Hz ~ 85 Hz Display Colors 16.2 Million colors 16.7 Million colors Maximum Resolution Horizontal : 1280 Pixels

Vertical : 1024 Pixels Input Video Signal Analog, 0.714 Vp-p ± 5% positive at 75 Ω,

internally terminated Input Sync Signal Type : Separate H/V sync, Composite H/V

Level : TTL level (V high ≥ 2.0 V, V low ≤ 0.8 V), Sync-on-Green (≤ –0.25 V) Maximum Pixel Clock rate 135 MHz Active Display

Horizontal/Vertical 338 ± 3 mm / 270 ± 3 mm 376.32 ± 3 mm / 301.056 ± 3 mm AC power voltage & Frequency AC 90 ~ 264 Volts, 60/50 Hz ± 3 Hz Power Consumption 42 W (max), 40W (normal) 42 W (max), 40W (normal) Dimensions

Set (W x D x H)

14.5 x 15.5 x 7.0 Inches (368.2 x 394.3 x 177.0mm) With stand 16.4 x 16.2 x 8.1 Inches (416.3 x 411.7 x 207.0 mm) With stand

14.5 x 12.2 x 2.3 Inches (368.2x 310.1x 58.8 mm) Without stand 16.4 x 13.5 x 2.3 Inches (416.3 x 342.0 x 57.9 mm) Without stand

Package

17.9 x 7.7 x 19.1 Inches (454x 195 x 483 mm) 20.1 x 7.7 x 20.0 Inches (510x 195 x 507 mm)

Weight (Set/Package) Environmental Considerations Operating Temperature : 50°F ~ 104°F (10°C ~ 40°C)

Operating Humidity : 10 % ~ 80 %

Storage Temperature : -13°F ~ 113°F (-25°C ~ 45°C)

Storage Humidity : 5 % ~ 95 %

• NB17A*/NB19A* complies with SWEDAC (TCO 99) recommendations for reduced electromagnetic fields.

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

Description

NB17A* NB19A*

4.7 kg (10.4 lbs) / 6.0 kg (13.2 lbs) 5.95 kg (13.1 lbs) / 7.8 kg (17.2 lbs)

NB17A*/NB19A* 2-1

Item

2 Product Specifications

2-2 NB17A*/NB19A*

2-2 Pin Assignments

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

2 Product Specifications

NB17A*/NB19A* 2-3

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

Separate Sync

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.

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

VIDEO

Horizontal

Vertical

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 Positive

Separate

1280/75 Hz

1280 x 1024

(Analog)

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

Positive 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 640 x 480

800/60 Hz 800 x 600

800/75 Hz 800 x 600

1024/60 Hz 1024 x 768

1024/75 Hz 1024 x 768

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 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 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 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 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 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 Positive

Separate

Mode

VESA

Timing

Green

Horizontal

Vertical

2 Product Specifications

2-4 NB17A*/NB19A*

Memo

NB17A*/NB19A* 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the NB17A*/NB19A* 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 2 screws from grip on the stand and remove signal cable. (CAUTION : Remove screw grip don’t on the stand than fall the stand from the top side of the foot.)

2. Remove front cover and remove back cover.

3. Remove 2 screws shield TCO and remove 1 screw shield power.

4. Remove casket tape and disconnect function cable, inverter cable.

(NB17A*) (NB19A*)

3 Disassembly and Reassembly

3-2 NB17A*/NB19A*

3-2 Replacement Order of Lamp Assemblies

1. Remove 2 screws from LCD module. (top & bottom)

Note : Always clear the work table

before operation.

2. Slide out the lamp unit. Do not use excessive force.

5. Disconnect LVDS cable and remove 4 screws from the shield. (the coner of the shield 4 screws)

6. Lift up shield from the panel.

3 Disassembly and Reassembly

NB17A*/NB19A* 3-3

3. Take out the lamp unit from the LCD module.

* Replacement of lamp unit should be done at the power off state and with a recommended clean bench

condition.

4. This picture shows the complete lamp ass’y removal from LCD module.

3-3 Reassembly

Reassembly procedures are in the reverse order of disassembly procedures.

Memo

3 Disassembly and Reassembly

3-4 NB17A*/NB19A*

4-1 Required Equipment

The following equipment is necessary for adjusting the monitor:

• Computer with Windows 95, Windows 98, or Windows NT.

• MTI-2031 DDC MANAGER JIG

4-2 Automatic Color Adjustment

To input video, use 16 gray or any pattern using black and white.

1. If OSD settings vary with relevant sales region, OSD language for ‘Auto Color’ displays default language setting for each region.

2. Press the “Exit” key for 5 seconds.

* Note : For models supporting the 4 languages (English, Simplified Chinese, Japanese, Korean), select

English and press and hold the ‘Exit’ key for 5 seconds.

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 1) and enter the data.

4-4 OSD Adjustment When Replacing Panel

1. Adjust brightness and contrast to 0. Then, press the exit key for 5 second. Service function OSD will appear on screen.

2. Press the + key to place the cursor on the panel. Press the menu key for 5 seconds.

4-5 OSD Adjustment When Replacing Lamp Only

1. Adjust brightness and contrast to 0. Then, press the exit key for 5 seconds. Service function OSD will appear on the screen.

2. Press the + key. Select upper lamp and press the menu key for 5 seconds. Then, select lower lamp and press the menu key for 5 seconds.

❇

Note : Please be sure to read the following instructions for details on service function.

NB17A*/NB19A*

4-1

4 Alignments and Adjustments

This section of the service manual explains how to use the RS232 JIG. This function is needed for AD board change and program memory (IC110) change.

Figure 1.

4 Alignments and Adjustments

4-2 NB17A*/NB19A*

4-6 Service Function Spec.

4-6-1 How to Display Service Function OSD

1. The value for brightness and contrast should be changed to zero.

2. Within 5 seconds, press the exit key.

3. Service function OSD will be displayed.

❇ If you want to disable the service function OSD, you will have to power off.

Figure 2. The example of service function OSD

Figure 3.

Panel Information

Software Version Check sum

The service function OSD is based on a grid of 29 columns x 12 rows. The service function OSD consists of panel information, software version and MICOM check sum.

4-6-2 How to Control Service Function OSD

1. With the panel selected on OSD, whenever you press the right key, the base color will change to blue

from “Panel” to “Country”, “Pixel Shift”, “Lower Lamp”, “Upper Lamp”.

4 Alignments and Adjustments

NB17A*/NB19A*

4-3

Figure 4.

4-6-3 How to Control Service Function OSD

• After change the panel or lamp, you must reset service function OSD.

• The case of panel change After changeing the panel, press the menu key within 5 seconds,.

Then, panel Ch. No increases one step and the panel time information is reset to zero. Simultaneously, other information is reset to zero (Upper/Lower lamp, Panel cycle).

Figure 5. Figure 6.

4-6-4 How to Control Service Function OSD

• In the case of Upper Lamp or Lower Lamp change After changeing the Upper Lamp or Lower Lamp,

1. Select the Upper Lamp or Lower Lamp

2. Press the Menu key within an 5 seconds.

Then, Ch. No and time will be reset to zero (selected item only).

4 Alignments and Adjustments

4-4 NB17A*/NB19A*

4-6-5 Pixel shift and language selection change

* Note : Use the '-' key to vary values for new pixel shift and country menu.

1. Pixel shift : on ➔ off

- When a same picture is displayed with no change for an extended period of time, this function prevents the display panel from image sticking.

* On for '0 x 01' with EEPROM 0x2E, Off for others; Always restart the monitor after EEPROM adjustment.

- Motion path : see Figure 7. One-step movement requires 4 minutes (total of 32 steps : 128 minutes)

- Location is reset. a) the monitor is restarted b) image mode is adjusted c) user adjusts a key

* Note : Pixel shift is not a vailable in service menu.

2. Country : Worldwide ➔ Korean ➔ Chinese ➔ Japanese

- This function enables to select relevant OSD language for each region / country.

- Worldwide : 7 languages (English, German, Spanish, French, Italian, Swedish, Russian)

- Korean : 2 languages (Korean, English)

- Chinese : 2 languages (Simplified Chinese, English)

- Japanese : 2 languages (Japanese, English)

Figure 7.

Figure 8. Figure 8-1.

+ 33 hidden pages