SAMSUNG SM570B580B Service Manual

COLOR MONITOR

SyncMaster 570BTFT SyncMaster 580BTFT (RN15MSS / RN15MST

RN15MOS / RN15MOT)

Manual

SERVICE

COLOR MONITOR CONTENTS

EXIT MENUAUTO EXIT MENUAUTO

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

Samsung Electronics Co., Ltd. September 1999 Printed in Korea Code No.: BN68-00084A

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.

SyncMaster 570BTFT / 580BTFT 1-1

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 SyncMaster 570BTFT / 580BTFT

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.

2 Product Specifications

2-1 Specifications

LCD Panel TFT-LCD panel, RGB vertical stripe, normaly white, 15-Inch viewable,

0.297 (H) x 0.297 (V) pixel pitch

Scanning Frequency Horizontal : 30 kHz to 61 kHz (Automatic)

Vertical : 50 Hz to 75 Hz (Automatic)

Display Colors 16,772,216 colors

Maximum Resolution Horizontal : 1024 Pixels

Vertical : 768 Pixels

Input Video Signal Analog, 0.714 Vp-p ± 5% positive at 75 Ω, internally terminated

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

without external switch of sync type

Level: TTL level

Maximum Pixel Clock rate 80 MHz

Active Display 304.1 mm / 228.1 mm Horizontal/Vertical

AC power voltage & Frequency AC 90 to 264 Volts, 60/ 50 Hz ± 3 Hz

Power Consumption 25 W (max.)

Dimensions Unit (W x D x H) 15.9x7.7x16.5 Inches (404 x 196 x 419 mm)

Carton (W x D x H) 18.7 x 11.1 x 20.1 Inches (475 x 282 x 510 mm)

Weight (Net/Gross) 7.4 kg / 9.4kg

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

Humidity : 10 % to 80 %

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

Audio Characteristics • Audio Characteristics

(optional) • Built-in Microphone: High-sensitivity condenser microphone (mono)

• Audio input: Left/Right Stereo phone jack, 0.7 Vrms

• Sound output: 16 W (left) + 16 W (right)/THD 1% at 16ohm

• Frequency response: 80 Hz~20 kHz (at –3dB)

• Headphone: Max 50mW output (3.5-pi jack)

• Speaker: Internal semi Dome (16ohm x 2)

• SyncMaster 570BTFT/580BTFT complies with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.

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

SyncMaster 570BTFT / 580BTFT 2-1

Item Description

16 ~26 GND GND GND

2 Product Specifications

2-2 SyncMaster 570BTFT / 580BTFT

2-2 Pin Assignments

Sync Type

Pin No.

15-Pin Signal Cable Connector

Separate Composite Sync-on-green

Sync-on-green

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

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 Clock

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 Clock

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 Clock

Sync Type

Pin No.

26-Pin Signal Cable Connector

Separate Composite

9 10 11 12 13 14 15

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 Clock

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 Clock

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 Clock

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

Positive

Negative

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 Frequency (MHz)

Polarity H.Sync

V.Sync

Remark

IBM

2 Product Specifications

SyncMaster 570BTFT / 580BTFT 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

VGA3/60 Hz

640 x 480

640/72 Hz

640 x 480

640/75 Hz

640 x 480

800/56 Hz

800 x 600

800/60 Hz

800 x 600

VGA1/70 Hz

640 x 350

VGA2/70 Hz

720 x 400

Table 2-1. Timing Chart

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

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

Negative

Separate

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

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

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

Positive

Negative

Separate

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

Positive

Separate

Mode

VESA

Timing

2 Product Specifications

2-4 SyncMaster 570BTFT / 580BTFT

48.077

20.800

2.400

1.280

16.000

1.120

72.188

13.853

0.125

0.478

12.480

0.770

50.000

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 Frequency (MHz)

Polarity H.Sync

V.Sync

Remark

VESA

1024/60 Hz

1024 x 768

1024/70 Hz

1024 x 768

1024/75 Hz

1024 x 768

640/67 Hz

60 x 480

832/75 Hz

832 x 624

800/72 Hz

800 x 600

800/75 Hz

800 x 600

Table 2-1. Timing Chart Continued

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

65.000

Negative

Separate

56.476

17.707

1.813

1.920

13.653

0.320

70.069

14.272

0.106

0.513

13.599

0.053

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

35.000

28.571

2.116

3.175

21.164

2.116

66.667

15.000

0.086

1.114

13.714

0.086

30.240

Negative

Separate

49.726

20.110

1.117

3.910

14.524

0.559

74.551

13.414

0.060

0.784

12.549

0.020

57.284

Negative

Separate

Mode

MAC.

Timing

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

Separate Sync

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

3-1-1 Removing the Stand

1. Remove 4 screws in the hinge area.

2. Pry it off the back of the monitor.

3. Disconnect Power Cord and Signal Cable.

3-1-2 Main Body Disassembly

1. Remove the 4 screws on the four corner of the Rear Cover.

2. Remove Rear Cover from the Front Cover.

3. Remove 11 screws on the Shield and remove the shield.

4. Disconnect Inverter wire, Function PCB wire and Interface wire. Remove 4 screws on the Main PCB and remove 2 screws on the D sub shield.

5. Remove the Main PCB Assembly.

6. Remove 6 screws on the Inverter PCB Assembly and then remove it

7. Remove 6 screws on the Rear Panel Bracket.

8. Remove the Bracket Assembly from the Front Cover.

9. Remove 3 screws on the Function PCB from locking area of Function knob and remove Function PCB.

10. Remove 4 screws on the Shield of Panel.

11. Remove the Shield.

12. Remove Rear Bracket from Panel.

13. Remove 2 screws between Panel Rear and Inverter PCB.

14. Remove the Interface wire on the Rear Side of Panel.

3-1-3 Standard Stand Disassembly

1. Remove 5 screws from the Stand Rear

2. Remove 4 screws from the Stand Bottom.

3. Remove Stand Front from the Stand assembly.

4. Remove 2 screws from the Stand assembly.

5. Remove the Stand Rear from the Stand assembly.

6. Remove 5 screws on the Vesa Brkt from the Stand assembly.

7. Remove cover hinge from the Stand assembly.

8. Remove Stand Base from the Stand assembly.

3-1-4 Pivot Multi-media Stand Disassembly

(option)

1. Stand the stand assembly with the base close to you.

2. Remove the 4 screws on the back cover of the stand and remove it.

3. Stand the stand assembly upside down.

4. Remove the 4 screws.

5. Disconnect CN805, CN806, CN807, CN808, CN809, CN812 and F1.

6. Remove the Back Cover of the Stand Front assembly.

7. Remove 4 screws on the external adaptor and remove the adaptor.

8. Remove 2 screws between hinge and Stand Body.

9. Remove the hinge

10. Remove 2 screws on Audio main PCB and remove it

11. Remove 2 screws on the Audio Function PCB and remove it.

3-1-5 Angle Pivot Stand Disassembly (option)

1. Remove the cap pivot from the stand assembly.

2. Remove the 4 screws on the hinge assembly.

3. Remove the 4 screws on the Stand Rear

SyncMaster 570BTFT / 580BTFT 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the SyncMaster 570BTFT/580BTFT 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.

4. Remove the Stand Rear from the Stand assembly.

5. Remove the Stand Front from the Stand assembly.

6. Remove the Neck Rear from the Stand assembly.

7. Remove the 4 Rubbers on the four corner of the Stand Bottom and the 4 screws on the four corner of the Stand Bottom.

8. Remove the 5 stopper hings from the Bracket Bottom.

9. Remove the Stand Base from the Stand Assembly.

3-1-6 Wire frame stand Disassembly (option)

1. Carefully pull the cover hinge.

2. Remove the cover vesa from the Stand assembly.

3. Remove 4 screws on the assembly Bracket assembly.

3 Disassembly and Reassembly

3-2 SyncMaster 570BTFT / 580BTFT

3-2 Replacement Order of Lamp Assemblies

- RN15MSS/RM15MOS (Samsung Panel)

3 Disassembly and Reassembly

SyncMaster 570BTFT / 580BTFT 3-3

3 Disassembly and Reassembly

3-4 SyncMaster 570BTFT / 580BTFT

2. Push down the stopper and slide the lamp unit.

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

3-3 Replacement Order of Lamp Assemblies

- RN15MST/RM15SOT (Toshiba Panel)

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.

3 Disassembly and Reassembly

SyncMaster 570BTFT / 580BTFT 3-5

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

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

condition.

3-4 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

Memo

3 Disassembly and Reassembly

3-6 SyncMaster 570BTFT / 580BTFT

SyncMaster 570BTFT/580BTFT 4-1

4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC’s display as below.

• Resolution: 1024 x 768

• H-frequency: 48 kHz

• V-frequency: 60 Hz

2. If no picture appears, make sure the power cord is correctly connected.

3. Check the following circuits.

• No raster appears: Audio PCB, SMPS PCB, Main PCB

• 12V develop but no screen: Main PCB

• 12V does not develop: Audio PCB, SMPS PCB

4. If you push and hold the “EXIT” button for more than 5 seconds, the monitor automatically turns back to the factory preset.

4-1 No Power

Does proper DC 12 V appear at

DC jack connected to CN102?

Check SMPS PCB and CN816.

Yes

Does proper DC 5 V appear at

Pin 3 of IC109?

Check FT100 and IC109.

Check IC401, IC111, Q101 and Q102.

Yes

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