Samsung LW17E24CB(TFT) Service Manual

LCD-TV MONITOR

Chassis Model
ES15E* LW15E23CB
ES17E* LW17E24CB

Manual

SERVICE

LCD-TV 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. Schematic Diagrams

11. Panel Description

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.

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.

LW15E23CB/LW17E24CB 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 LW15E23CB/LW17E24CB

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 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.

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea.
Printed in Korea
P/N : BN82-00071C-00
http://www.samsungmonitor.com (SyncMaster Worldwide)
http://www.samsung-monitor.com (SyncMaster USA)
http://www.sec.co.kr/monitor (Korea)

CONFIDENTIAL

2 Product Specifications

2-1 Specifications

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

white, 15-Inch viewable, 0.297 mm pixel pitch white, 17-Inch viewable, 0.264 mm pixel pitch

Scanning Frequency Horizontal : 30 KHz ~ 69 KHz (Automatic) 30 KHz ~ 81 KHz (Automatic)

Vertical : 56 Hz ~ 75 Hz (Automatic) 56 Hz ~ 75 Hz (Automatic)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1024 Pixels 1280 Pixels

Vertical : 768 Pixels 1024 Pixels
Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75 Ω, internally terminated
Input Sync Signal Type : Separate H/V, automatic synchronization without external switch of sync type

Level : TTL level
Maximum Pixel Clock rate 95 MHz 135 MHz
Active Display

Horizontal/Vertical
AC power voltage & Frequency

AC 90 ~ 264 Volts, 60 / 50 Hz ± 3 Hz
Power Consumption 48 W (Max), (2W Power surge) 58 W (Max), (2W Power surge)
Dimensions

Unit (W x D x H) 18.6 x 12.4 x 2.0 Inches (474 x 317 x 51 mm)

20.8 x 14.4 x 2.2 Inches (530 x 367 x 57 mm)

With stand (W x D x H)

18.6 x 15.6 x 8.0 Inches (474 x 397 x 204 mm)

20.8 x 17.6 x 8.0 Inches (530 x 447 x 204 mm)
Weight 3.97 Kg (8.75 Ibs) 4.95 Kg (10.9 Ibs)
Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)

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

TV System

Antenna Input 75Ω, Coaxial Cable

– MAX internal speaker Out : Right => 3W Right => 5W

Left => 3W Left => 5W

Sound Characteristic

– BASS Control Range : -12dB~ + 12dB
– TREBLE Control Range : -12dB~ + 12dB
– Headphone Out: RF => 5mW max (400m Vrms)

A/V => 10mW max (580 Vrms), Max input sound: -9dBm

– Output Frequency : RF => 80 Hz ~ 15 KHz

A/V => 80 Hz ~ 20 KHz

LW15E23CB/LW17E24CB 2-1

Item

Description

LW15E23CB LW17E24CB

304.1 mm / 228.1 mm 338.1 mm / 270.1 mm

Tuning Frequency Synthesize

Color PAL Multi

Sound PAL Multi

CONFIDENTIAL

2 Product Specifications

2-2 LW15E23CB/LW17E24CB

2-2 Pin Assignments

Sync
Type

Pin No.

Separate H/V Composite H/V

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-Red
GND-Green
GND-Blue
No Connection
GND-Sync./Self Test
GND
DDC Data
Horizontal sync.
Vertical sync.
DDC Clock

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

CONFIDENTIAL

2 Product Specifications

LW15E23CB/LW17E24CB 2-3

QRS

P

O

Video

Sync

Sync

Horizontal

Vertical

CDE

P

O

B

A

Video

Sync

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

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

VIDEO

A

B

O

P

Q

R

S

Horizontal

Vertical

H/V Composite Sync

Sync-on-Green

79.976

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

81.129

16.640

6.400

2.880

3.200

76.106

10.660

0.080

3.200

0.020

135.000

Negative
Negative

Com.

68.677

14.561

1.016

2.201

10.836

0.508

84.997

11.765

0.044

0.524

11.183

0.015

94.500

Positive
Positive

Separate

1024/85Hz

1024x768

1280/76Hz
1280x1024

1280/75Hz
1280x1024

1024/75Hz

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

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

640/85 Hz
640 x 480

800/75 Hz
800 x 600

800/85 Hz
800 x 600

1024/60Hz

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

25.175

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

43.269

23.111

1.556

2.222

17.778

1.556

85.008

11.764

0.671

0.578

11.093

0.023

49.500

Negative
Negative
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

53.674

18.631

1.138

2.702

14.222

0.569

85.061

11.756

0.056

0.503

11.179

0.019

56.250

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

Mode

VESA

Timing

(17” Only) (17” Only)

Green

Horizontal

Vertical

P

B

Q

R

O

S

Memo

2 Product Specifications

2-4 LW15E23CB/LW17E24CB

CONFIDENTIAL

LW15E23CB/LW17E24CB 3-1

CONFIDENTIAL

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the
LW15E23CB/LW17E24CB 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.

1. Remove the 4 screws (Rear Cover + Stand) on
the rear cover.

2. Remove the assy stand from rear cover.

3. Remove the 3 screws (Rear Cover + Cover
Front) on the rear.

CONFIDENTIAL

3 Disassembly and Reassembly

3-2 LW15E23CB/LW17E24CB

3-2 Reassembly

Reassembly procedures are in the reverse order of dissasembly procedures.

4. Lift up the rear cover until it opens
completely.

CONFIDENTIAL

LW15E23CB/LW17E24CB 4-1

4 Alignments and Adjustments

4-1 General Alignment Instruction

1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync.

2. Use the specified test equipment or its equivalent.

3. Correct impedance matching is essential.

4. Avoid overload. Excessive signal from a sweep generator might overload the front-end
of the TV. When inserting signal markers, do not allow the marker generator to distort
test results.

5. Connect the TV only to an DC power source with voltage and frequency as specified on
the backcover nameplate.

6. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure
that the power cord is disconnected before replacing any parts.

7. To protect aganist shock hazard, use an isolation transformer.

4 Alignments and Adjustments

4-2 LW15E23CB/LW17E24CB

CONFIDENTIAL

4-2 Adjustment Instruction

4-2-1 Service Mode Screen

1. Adjustment

2. Options

3. Auto Color

4. Reset

4-2-2 Service function

1. EEPROM Clear : Initially executed when replacing OTP.

2. TV Auto Color : Used to adjust TV image color.

3. PC Auto Color : Used to adjust PC image color.

4. Reset : Used after all adjustments.

5. Other functions shown are not service related.

4-2-3 Adjustment Sequence for ROM change only

RGB Contrast
RGB Bright
R Gain
G Gain
B Gain
FB Gain

Default : on
Help Osd : off
Suwon Ch Table
Spain Ch Table
Eeprom clear

Auto color (PC)
Auto color (TV)

EEPROM Clear TV auto color PC auto color RESET

(For ROM

change only)

CONFIDENTIAL

LW15E23CB/LW17E24CB 5-1

5 Troubleshooting

5-1 No Power

Does proper DC 14 V appear at

DC jack connected to CN12?

Check SMPS PCB and Adapter.

Yes

No

Does proper DC 5 V appear at

Pin 4 of IC11?

Check IC11.

Check IC23.

Yes

No

Does proper DC 14V appear at

Pin 1 of IC11?

Check IC11.

Yes

No

Does proper DC 3.3 V appear at

Pin 3 of IC14?

Check IC14.

Yes

Yes

No

Does proper DC 2.5 V appear at

Pin 4 of IC109 and IC17?

Check IC109 and IC17.

No

CONFIDENTIAL

5 Troubleshooting

5-2 LW15E23CB/LW17E24CB

5-2 No Video (PC Signal)

Power indicator is green.

Does the signal appear

at C134, C135, C136

of R, G, B input?

Check CN11.

Yes

Yes

No

Does the clock pulse

appear at X21?

Check X21 and related circuit of X21.

Yes

No

Does the clock pulse appear at

output of <RA35~RA39, RA310>15”

<RA35~RA39, RA310,

RA313~318>17”?

Check related circuit of IC32.

Yes

No

Does the clock pulse appear at

output of <R611~R620>15”

<R611~R620, R61~R69, R610>17”?

Replace

<R611~R620>15”

<R611~R620, R61~R69, R610>17”.

Yes

No

Replace LCD Panel.

CONFIDENTIAL

5 Troubleshooting

LW15E23CB/LW17E24CB 5-3

Does signal appear at

<RA35~RA39, RA310>15”

<RA35~RA39, RA310, RA313~RA318>17”

of related IC32?

Check IC32 and related circuit .

Yes

No

Check IC61, 62 and

<R611, 612, ~R620>15”

<R611, 612, ~R620, R61~R69, R610>17”.

5-3 No Picture (TV, Video, S-Video)

Check Pin 55, 56 (S-Video) and

Pin 52 (VCR) and Pin 74 and Pin 53

(RF-CVBS) and Pin 58 (Scart-Vin)

of IC401 (VSP9407)?

Check CN41 (Tuner) and

CN26 (VCR connector).

Yes

No

Does the signal appear at

RA33, RA34, RA311, RA312?

Check IC401 (VSP9407)

and related circuit.

Yes

No

CONFIDENTIAL

5 Troubleshooting

5-4 LW15E23CB/LW17E24CB

Does the signal appear at

Pin 67 (Tuner sound signal) and

Pin 57, 56 (PC sound) and Pin 51, 50

(VCR sound) of IC53 (MSP3421G)?

Check CN11 (PC conector)

and CN26(VCR connector).

Yes

No

Does the signal appear at Pin 27,

28 of IC53 (MSP3421G)?

Check IC32 and related circuit.

Yes

No

Does the signal appear

at L53~L56?

Check IC55 (Audio amp) and related circuit.

Yes

No

Replace the speaker.

5-4 No Sound

CONFIDENTIAL

LW15E23CB/LW17E24CB 6-1

6 Exploded View and Parts List
6-1-1 LW15E23CB

6 Exploded View & Parts List

6-2 LW15E23CB/LW17E24CB

CONFIDENTIAL

6-1-2 LW15E23CB Front

11

10

8

9

4

1

5

3

7

5

6

2

5

5

LW15E23CB/LW17E24CB 6-3

6 Schematic Diagrams

CONFIDENTIAL

6-1-3 LW15E23CB Rear

2

3

1

6 Exploded View & Parts List

6-4 LW15E23CB/LW17E24CB

CONFIDENTIAL

6-1-3 LW15E23CB Stand

3

2

5

4

1

6

8

7

9

LW15E23CB/LW17E24CB 6-5

6 Schematic Diagrams

CONFIDENTIAL

6-2-1 LW17E24CB

6 Exploded View & Parts List

6-6 LW15E23CB/LW17E24CB

CONFIDENTIAL

6-2-2 LW17E24CB Front

11

10

8

9

4

1

5

3

7

5

6

2

5

5

LW15E23CB/LW17E24CB 6-7

6 Schematic Diagrams

CONFIDENTIAL

6-2-3 LW17E24CB Rear

2

3

1