Samsung 172B, 172T Schematic

TFT-LCD MONITOR

Chassis Model MO17P* 172T MO17E* 172B

Manual

SERVICE

TFT-LCD MONITOR CONTENTS

1. Precautions

2. Product Specifications

3. Disassembly & Reassembly

4. Troubleshooting

5. Exploded View & Parts List

6. Electrical Parts List

7. Block Diagram

8. Wiring Diagram

9. Schematic Diagrams

10. Panel Description

CONFIDENTIAL

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea. Printed in Korea P/N : BN82-00074A-00 http://www.samsungmonitor.com (SyncMaster Worldwide) http://www.samsung-monitor.com (SyncMaster USA) http://www.sec.co.kr/monitor (Korea)

copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of Samsung Electronics Co., Ltd.

MO17P*/MO17E* Service Manual First edition July 2002. Printed in Korea.

Trademarks

Samsung is the registered trademark of Samsung Electronics Co., Ltd. MO17P*/MO17E* and Macmaster Cable Adapter are trademarks of Sansung Electronics Co., Ltd.

Macintosh, Centris, Quadra, Duo Douk, and Power Macintosh are trademarks of Apple Computer, Inc.

All other trademarks are the property of their respective owners.

ii MO17P*/MO17E*

CONFIDENTIAL

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).

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.

MO17P*/MO17E* 1-1

CONFIDENTIAL

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 MO17P*/MO17E*

CONFIDENTIAL

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 devices are integrated circuits and some fieldeffect 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.

CONFIDENTIAL

MO17P*/MO17E* 2-1

2 Product Specifications

2-1 Specifications

LCD Panel TFT-LCD panel, RGB vertical stripe, normally white transmissive,

17-Inch viewable, 0.264 pixel pitch

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

Vertical : 56 Hz ~ 75 Hz Display Colors 16,2 Million colors Maximum Resolution Horizontal : 1280 Pixels @ 81 kHz

Vertical : 1024 Pixels @ 75 Hz Input Video Signal Analog, 0.7 Vp-p ± 5% positive at 75 Ω, TMDS

internally terminated Input Sync Signal

Type : Seperate H/V sync., In case of using option cable, Composite, Automatic Synchronization without external switch

Level : TTL level (V high ≥ 2.0 V, V low ≤ 0.8 V) Maximum Pixel Clock rate 135 MHz Active Display 337.92 ± 92 mm

Horizontal/Vertical 270.336 ± 3 mm AC power voltage & Frequency AC 90 ~ 264 Volts, 60/50 Hz ± 3 Hz Power Consumption 42 W (max), 35 W (normal) Dimensions

Unit (W x D x H) 385 x 216 x 396.3 mm (15.2 x 8.5 x 15.6 inches) / After installation of stand

385 x 56.8 x 324.7 mm (15.2 x 2.2 x 12.8 inches) / After folding the stand Carton (W x D x H) 468 x 400 x 145 mm (18.4 x 15.7 x 5.7 inches)

Weight (Net/Gross) Normal stand 4.7 kg (10.4 lbs) / 6.8 kg (15.0 lbs) Multi stand 4.8 kg (10.6 lbs) / 6.9 kg (15.2 lbs)

Environmental Considerations Operating Temperature : 41°F ~ 95°F (5°C ~ 35°C)

Humidity : 10 % ~ 80 %

Storage Temperature : -4°F ~ 113°F (-20°C ~ 45°C)

Humidity : 5 % ~ 95 %

• MO17P*/MO17E* comply with TCO99 recommendations for reduced electromagnetic fields.

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

Item

Analog Digital

Description

CONFIDENTIAL

2 Product Specifications

2-2 MO17P*/MO17E*

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 video Green video Blue video GND GND (DDC Return) Red video GND Green video GND Blue video GND No Connection Sync.-GND/Self Test GND DDC Data H-Sync. V-Sync. DDC Clock

Red video Green video Blue video GND GND (DDC Return) Red video GND Green video GND Blue video GND No Connection Sync.-GND/Self Test GND DDC Data H/V-Sync. Not Used DDC Clock

Red Green video + H/V Sync. Blue video GND GND (DDC Return) Red video GND Green video GND Blue video GND Not Used GND-Sync./Self Test GND DDC Data Not Used Not Used DDC Clock

Sync-on-green

No Connection

DDC Power Input (+5V)

Self Raster

Connection Signal Output (+5V)

Rx0Rx0+ GND

No Connection No Connection

GND RxC+ RxC-

13 14 15 16 17 18 19 20 21 22 23 24

1 2 3 4 5 6 7 8

9 10 11 12

Rx2Rx2+ GND

No Connection

No Connection DDC Clock (SCL) DDC Data (SDA)

No Connection

Rx1Rx1+ GND

No Connection

Sync Type

Pin No.

24-Pin DVI-D(TMDS)

2 Product Specifications

MO17P*/MO17E* 2-3

CONFIDENTIAL

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.

2-3-1 LCD Panel Mode : 1 mode

Definition of Terms Video

HSync

Sync Sync

Sync Time

Blanking

Blank Srart

Sync Srart

Blank Time

Back Porch

Back

Porch

Top/Left

Border

"Activer"Video

Bottom/Right

Border

"Addressable"Video

(Addr Time)

Front

Porch

YSync

2 Product Specifications

2-4 MO17P*/MO17E*

CONFIDENTIAL

2-3-2 Supported Modes (1)

2 Product Specifications

MO17P*/MO17E* 2-5

CONFIDENTIAL

2-3-2 Supported Modes (2)

2 Product Specifications

2-6 MO17P*/MO17E*

CONFIDENTIAL

2-3-2 Supported Modes (3)

2 Product Specifications

MO17P*/MO17E* 2-7

CONFIDENTIAL

2-3-2 Supported Modes (4)

1. Locate the monitor on the table with face down.

2. Loose the snaps of Hinge cap through the slot of cover rear.

3. Remove the hinge cap.

CONFIDENTIAL

MO17P*/MO17E* 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the MO17P*/MO17E* monitors.

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.

3-1-1 Main Body Disassembly

3 Disassembly and Reassembly

3-2 MO17P*/MO17E*

CONFIDENTIAL

4. Remove 2 screws on the hinge mounting. Do not remove the screw for cable clamp.

5. Disconnect the stand cable from socket and remove stand assembly.

6. Remove 2 screws of cover rear.

7. Open the cover rear by using opening jig.

8. Remove screws arround bracket panel and pull out function wire from socket.

3 Disassembly and Reassembly

MO17P*/MO17E* 3-3

CONFIDENTIAL

9. Seperate shield ass’y and panel ass’y.

10. Remove screws on main board and inverter board.

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