Samsung LW17N13WR(TFT) Service Manual

TFT-LCD TV/MONITOR

NK15A*/NK17A*

Manual

SERVICE

TFT-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

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea.
Printed in Korea
P/N : BN81-00027C-00
http://www.samsungmonitor.com (SyncMaster Worldwide)
http://www.samsung-monitor.com (SyncMaster USA)
http://www.sec.co.kr/monitor (Korea)

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.

NK15A*/NK17A* 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 NK15A*/NK17A*

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

2 Product Specifications

2-1 Specifications

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

white, 15-Inch viewable, 0.261 mm pixel pitch white, 17-Inch viewable, 0.2895 mm pixel pitch

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

Vertical : 56 Hz ~ 75 Hz (Automatic)
Display Colors 16.2 Million colors
Maximum Resolution Horizontal : 1280 Pixels 1280 Pixels

Vertical : 768 Pixels 768 Pixels
Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75 Ω, internally terminated
Input Sync Signal Type : Seperate H/V

Level : TTL level
Maximum Pixel Clock rate 80 MHz 80 MHz
Active Display

Horizontal/Vertical
AC power voltage & Frequency

AC 90 ~ 264 Volts, 60 / 50 Hz ± 3 Hz
Power Consumption 50 W (Max) 53 W (Max)
Dimensions

Unit (W x D x H)

19.6 x 8.0 x 14.7 Inches (498 x 204.5 x 374 mm)

21.1 x 8.0 x 15.8 Inches (536 x 204.5 x 402 mm)

Carton (W x D x H)

22.5 x 17.4 x 10.6 Inches (571 x 441 x 269 mm)

24.0 x 18.3 x 10.6 Inches (609 x 465 x 269 mm)
Weight 3.95 Kg (8.7 Ibs) 4.8 Kg (10.6 Ibs)
Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)

Humidity : 10 % ~ 80 %
Storage Temperature : -4 °F ~ 113 °F (-20 °C ~ 45 °C)
Humidity : 5 % ~ 95 %

TV System

Antena Input 75Ω, Coaxial Cable

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

Left => 3W Left => 5W

Sound Characteristic

– BASS Control Range : -12 dB~ + 12 dB
– TREBLE Control Range : -12 dB~ + 12 dB
– Headphone Out: 5mW max (400m Vrms)
– Output Frequency : RF => 80 Hz ~ 15 kHz

A/V => 80 Hz ~ 15 kHz

NK15A*/NK17A* 2-1

Item

Description

NK15A* NK17A*

334.08 mm / 200.44 mm 370.560 mm / 222.336 mm

Tunning Frequency Synthesize

System PAL, SECAM, NTSC 4.4

Sound BG, DK, I, L, L’

CVBS

Audio L

GND

Audio R

GND

CONFIDENTIAL

2 Product Specifications

2-2 NK15A*/NK17A*

2-2 Pin Assignments

Pin

Separate

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
H-Sync.
V-Sync.
DDC Clock

Pin

Separate

1

2

3

4

5

GND

Y

C
GND
GND

2-2-1 D-SUB

2-2-3 S-Video

2-2-2 SCART1, SCART2

RCA White

RCA Red

2-2-4 A/V

RCA Yellow

1
2
3
4

5
6
7

8

9
10
11
12
13
14
15
16
17
18
19
20
21

Items Scart1 Scart2

Pin

No

Audio Out (R;500mV/1KΩ)
Audio IN (R;500mV/10KΩ)
Audio Out (L;500mV/1KΩ)
Audio Common GND
Blue GND
Audio IN (L;500mV/10K)
Blue IN (700mV/75Ω)
Function S/W

(0~2V/9, 5V~12V)
Green GND
No Connection
Green IN (700mV/75Ω)
No connection
Red GND
F/B GND
Red IN (700mV/75Ω)
RGB F/B (0~0, 4V/1~3V)
Video Output GND
Video Input GND
CVBS Out (1V/75Ω)
CVBS IN (1V/75Ω)
Common GND

OO

O
O
O
O
O

O
O

O
O

O
O
O
O
O

O
O
O
O
O
O

O
O

O
O
O
O
O
O
O
O
O
O
O
O

CONFIDENTIAL

2 Product Specifications

NK15A*/NK17A* 2-3

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.

µs
µs
µs
µs
µs
µs
µs
µs

2-3-1 LCD Panel Mode : 1 mode

CONFIDENTIAL

2 Product Specifications

2-4 NK15A*/NK17A*

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

2-3-2 Supported Modes (1)

CONFIDENTIAL

2 Product Specifications

NK15A*/NK17A* 2-5

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

2-3-2 Supported Modes (2)

CONFIDENTIAL

2 Product Specifications

2-6 NK15A*/NK17A*

µs
µs
µs
µs
µs
µs
µs
µs

µs
µs
µs
µs
µs
µs
µs
µs

2-3-2 Supported Modes (3)

3-1 General Alignment Instuction

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 result.

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 transform.

NK15A*/NK17A* 3-1

CONFIDENTIAL

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the
NK15A*/NK17A* 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. After confirm there is nothing
on the desk
Turn the LCD module over
and put it on a flat desk set to
the ground.

3-2 Replacement Order of Lamp Assemblies

CONFIDENTIAL

3 Disassembly and Reassembly

3-2 NK15A*/NK17A*

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

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

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

3-3 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

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

condition.

CONFIDENTIAL

NK15A*/NK17A* 4-1

4 Alignments and Adjustments

4-1 General Alignment Instuction

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 result.

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 transform.

4 Alignments and Adjustments

4-2 NK15A*/NK17A*

CONFIDENTIAL

4-2 Factory Mode Adjustments

4-2-1 Entering Factory Mode

1. To enter “Service Mode” Press the remote - control keys in this sequence :

- If you do not have Factory remote - control

- If you have Factory remote - control

4-2-2 Factory Mode Tree

4 Alignments and Adjustments

NK15A*/NK17A* 4-3

CONFIDENTIAL

Memo

4 Alignments and Adjustments

4-4 NK15A*/NK17A*

CONFIDENTIAL

CONFIDENTIAL

NK15A*/NK17A* 5-1

5 Troubleshooting

5-1 No Power

Does proper DC 14V appear at DC

jack connected to CN801?

Check SMPS PCB and Adapter.

Yes

No

No

No

No

No

Does proper DC 3.3V_A

appear at FT852?

Check IC801. (#2)

Yes

Does proper DC 2.5V_A

appear at Pin 3 of IC802?

Check IC802.

Yes

Does proper DC 3.3V_B

appear at FT822?

Check IC805. (#1)

Yes

Does proper DC 2.5V_B

appear at Pin 3 of IC806?

Check IC806.

WAVEFORMS

IC801 #2

1

IC805 #1

2

1

2

CONFIDENTIAL

5 Troubleshooting

5-2 NK15A*/NK17A*

5-2 No Video (PC Signal)

Power indicator is green.

Does the signal appear

at C306, C398, C397

of R, G, B input?

Check CN401 and cable.

Yes

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Does the clock pulse appear at

output of RA351 ~ RA356?

Check related circuit of IC350.

Does the clock pulse

appear at R354?

Check R354 and related

circuit of R354.

Does the clock pulse

appear at X201?

Check X201 and related

circuit of X201.

Does the clock pulse appear at

output of RA301~RA306?

Replace RA301 ~ RA306, IC300.

Replace LCD Panel.

WAVEFORMS

Full White R, G, B Input (C306, 398, 397)3X201

4

3

4