Samsung 510N, 911N, 920N, 510T, 710N Service Manual

TFT-LCD MONITOR

Chassis Model
MJ15AS* 510N
MJ15BS* 510T
MJ17AS* 710N
MJ17BS* 710T
MJ19AS* 910N, 911N, 920N
MJ19BS* 910T
MJ19ES* 913N
MJ19US* 915N
MJ19QS* 913T, 910B
MJ19DS* 912T

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

Simple Stand Pivot Stand

Simple Stand

1 Precautions

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 resistor­capacitor 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 safety­related 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 Precautions

1-2

1-2-1

General Ser vicing 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 wrist-strap 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.

1-3

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 Ser vicing 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

2 Product Specifications

2-1 MJ15AS*/MJ15BS*/MJ17AS*/MJ17BS* Specifications

LCD Panel

TFT-LCD panel, RGB vertical stripe, normally black transmissive, TFT-LCD panel, RGB vertical stripe, normally black transmissive,
15-Inch viewable, 0.297 (H) x 0.297 (V) mm pixel pitch

17-Inch viewable, 0.264 (H) x 0.264 (V) mm pixel pitch

Scanning Frequency

Horizontal : 31 kHz ~ 61 kHz (Automatic) Horizontal : 30 kHz ~ 81 kHz (Automatic)
Vertical : 50 Hz ~ 75 Hz Vertical : 56 Hz ~ 75 Hz

Display Colors 16.2 Million colors

Maximum Resolution Horizontal : 1024 Pixels Horizontal : 1280 Pixels

Vertical : 768 Pixels Vertical : 1024 Pixels

Input Video Signal

Analog, 0.714 Vp-p ± 5% positive at 75 Ω, [Digital(TMDS): MJ15BS*, MJ17BS*]
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 80 MHz 135 MHz

Active Display
Horizontal/Vertical 304.1 mm / 228.1 mm 338 ± 3 mm / 270 ± 3 mm

AC power voltage & Frequency AC 90 ~ 264 Volts, 60/50 Hz ± 12V / 3A

AC 90 ~ 264 Volts, 60/50 Hz ± 3 Hz

Power Consumption 25W (normal) 34W (normal)

Dimensions

Set (W x D x H)

13.3 x 2.2 x 10.7 Inches (338.0 x 56.3 x 272.0 mm) State of stand disassembled 14.6 x 2.4 x 12.4 Inches (370.0 x 60.3 x 316.0 mm) State of stand disassembled

13.3 x 6.9 x 13.3 Inches (338.0 x 175.0 x 337.0 mm) State of stand installed 14.6 x 6.9 x 15 Inches (370.0 x 175.0 x 381.0 mm) State of stand installed

Package

15.3 x 4.9 x 15.1 Inches (388 x 125 x 383 mm) 17.9 x 5.6 x 17.2 Inches (455 x 141 x 437 mm)

Weight (Set/Package)

Dimensions

Set (W x D x H)

14.6 x 2.4 x 12.4 Inches (370.0 x 60.3 x 316.0 mm) State of stand disassembled

14.6 x 7.5 x 16.0 Inches (370.0 x 190.9 x 406.8 mm) State of stand installed

Package

20.0 x 10.1 x 16.0 Inches (508 x 256 x 407 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 %

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

Description

MJ15AS*/MJ15BS* MJ17AS*/MJ17BS*

3.1 kg (6.8 lbs) / 4.25 kg (9.4 lbs)

Simple StandSimple Stand / Pivot Stand

Pivot Stand

4.5 kg (9.9 lbs) / 6.15 kg (13.6 lbs)

-

-

6.25 kg (13.8 lbs) / 7.95 kg (17.5 lbs)

Item

2 Product Specifications

2-3

2-3 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

No Connection

+5V_M

Self Raster

+5V_M

Rx0-

Rx0+

NC

No Connection

No Connection

NC

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

Rx2-

Rx2+

GND

No Connection

No Connection

DDC Clock (SCL)

DDC Data (SDA)

NC

Rx1-

Rx1+

NC

No Connection

Sync
Type

Pin No.

24P DVI-D

2 Product Specifications

2-4

Separate Sync

2-4 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

A

O

E

B

P

Video

Sync

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

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

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

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(MJ17AS*/MJ17BS*/

MJ19AS*/MJ19BS*/MJ19ES*/MJ19US*/MJ19QS*)

VESA

(MJ15AS*/MJ15BS*/MJ17AS*/MJ17BS*/MJ19AS*/MJ19BS*/MJ19ES*/MJ19US*/MJ19QS*)

Timing

3 Disassembly and Reassembly

3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the
MJ15AS*/MJ17AS*/MJ19AS*/MJ15BS*/MJ17BS*/MJ19BS*/MJ19ES* TFT-LCD 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.

1. After placing monitor on the cushioned table,
remove two screws on the left and right of the
bottom.

2. Disconnect back cover from monitor after
grabbing the right edge of the set ( ) and
lifting the stand( ).

3. Remove 2 screws from the shield.

4. Disconnect function cable from the cover front
and lift up the panel. Remove 4 screws from
the panel shield. (Right / Left)

5. Lift up the panel shield and carefully remove
the silicon glue on the cables with a nipper.

Caution : Lamp wire may be easily damaged.

Please use caution when removing the silicon.

!!!

1

1

2

2

3 Disassembly and Reassembly

3-2

6. Remove 7 screws, 4 hexa screws from the boards
and lift up the boards.

Caution : When repairing panel only,
disconnect just LVDS cable, Panel-Lamp /
Wire marked in circle in the picture without
removing the screws on board in order to lift
the board up.

7. This picture is panel.

!

3-2 MJ19ES*/MJ19BS*/MJ19US*/MJ19QS* Disassembly

1. After placing monitor on the cushioned table,
remove 6 screws on the left and right of the
bottom.

2. Lift the stand and lift up the back cover.

3. Remove 2 screws from the shield.

4. Disconnect function cable from the cover front and
lift up the panel. Remove 4 screws from the panel
shield. (Right / Left)

3 Disassembly and Reassembly

3-3

3-2 Reassembly

Reassembly procedures are in the reverse order of disassembly procedures.

5. Lift up the panel shield and disconnect cables.

6. Remove 5 screws, 2 hexa screws from the boards
and lift up the boards.

Caution : When repairing panel only,
disconnect just LVDS cable, Panel-Lamp /
Wire marked in circle in the picture without
removing the screws on board in order to lift
the board up.

7. This picture is panel.

!

4 Alignments and Adjustments

4-1

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. Select english for OSD language.

2. Press the “ (Enter/Source)” 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 (Enter/Source) 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.

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

4-6 Ser vice 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 (Enter/Source) 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

Softward Version
Checksum

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 checksum.

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 “Upper Lamp”, “Lower Lamp”.

4 Alignments and Adjustments

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, 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

Memo