Samsung ls15n13w service manual

TFT-LCD TV/MONITOR

NK15S* (LS15N13W) NK17S* (LS17N13W)

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

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.

LS15N13W/LS17N13W 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 LS15N13W/LS17N13W

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 46 W (Max) 49 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

LS15N13W/LS17N13W 2-1

Item

Description

LS15N13W LS17N13W

334.08 mm / 200.44 mm 370.560 mm / 222.336 mm

Tunning Frequency Synthesize

System PAL, SECAM, NTSC 4.43, NTSC 3.58

Sound BG, DK, I, M

CVBS

Audio L

GND

Audio R

GND

CONFIDENTIAL

2 Product Specifications

2-2 LS15N13W/LS17N13W

2-2 Pin Assignments

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

Separate

GND

C GND GND

2-2-1 D-SUB

2-2-3 S-Video

2-2-2 DVD,DTV

RCA White

RCA Red

2-2-4 A/V

RCA Yellow

GND

Pb (Cb)

GND

Pr (Cr)

GND

Audio L

GND

Audio R

GND

RCA Green

RCA Blue

RCA Red

RCA White

RCA Red

CONFIDENTIAL

2 Product Specifications

LS15N13W/LS17N13W 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 LS15N13W/LS17N13W

µs µs µs µs µs µs µs µs

2-3-2 Supported Modes (1)

CONFIDENTIAL

2 Product Specifications

LS15N13W/LS17N13W 2-5

µs µs µs µs µs µs µs µs

2-3-2 Supported Modes (2)

CONFIDENTIAL

2 Product Specifications

2-6 LS15N13W/LS17N13W

µs µs µs µs µs µs µs µs

2-3-2 Supported Modes (3)

LS15N13W/LS17N13W 3-1

CONFIDENTIAL

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the LS15N13W/LS17N13W 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 Ass’Y Stand from rear cover.

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

CONFIDENTIAL

3 Disassembly and Reassembly

3-2 LS15N13W/LS17N13W

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

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

CONFIDENTIAL

LS15N13W/LS17N13W 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 LS15N13W/LS17N13W

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

LS15N13W/LS17N13W 4-3

CONFIDENTIAL

Memo

4 Alignments and Adjustments

4-4 LS15N13W/LS17N13W

CONFIDENTIAL

LS15N13W/LS17N13W 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

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

IC805 #1

CONFIDENTIAL

5 Troubleshooting

5-2 LS15N13W/LS17N13W

5-2 No Video (PC Signal, DTV)

Power indicator is green.

Does the signal appear

at C306, C398, C397

of R, G, B input?

Check CN401

CN409~CN411 and cable.

Yes

Does the clock pulse appear at

output of RA351 ~ RA356?

Check related circuit of IC350.

Does the clock pulse

appear at IC002~IC005?

Check IC001 and related

circuit of IC001.

Does the signal appear at CR01,

CG01,CB01 of R,G,B output?

Check X201 and related

circuit of IC200.

Does the clock pulse appear at

output of RA301~RA306?

Check IC901 and related

circuit of IC300.

Replace LCD Panel.

WAVEFORMS

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

3-1

FullWhite Y Input (C398_DTV)

3-2

X201

DPTV R, G, B Output (CR01, CG01, CB01)

3-1 3-2

Yes

CONFIDENTIAL

5 Troubleshooting

LS15N13W/LS17N13W 5-3

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

Check the CO44, CO45(S-Video), CO46(VCR) and CO42(RF-CVBS),

C035(DVD_Y)

Check the CN888(Tuner) and the

CN702_1, CN404~CN406(DVD).

Yes

Does the clock pulse appear at

IC006~IC009 of output IC010?

Check the #19 of IC011

and realted circuit of IC010.

Yes

Does the signal appear at

CR01, CG01, CB01 output?

Check X201 and related

circuit of IC200.

Yes

Does the signal appear at

IC901 and 3.3V_BD.

Check the IC300 and

related circuit of IC300.

Yes

Check the CN901 and replace LCD Panel.

6-1

6-2 6-3 6-4

7 8

IC011 #1 RF-CVBS IC011 #5 S-Video IC011 #8 VCR IC010 #5 DVD_Y

6-3

5 Troubleshooting

5-4 LS15N13W/LS17N13W

CONFIDENTIAL

WAVEFORMS

X201

IC011 Output Data (#19)

6-1 6-2

6-4

DVD Y Input (CO35)

IC006-IC009 Output Data

5 Troubleshooting

LS15N13W/LS17N13W 5-5

CONFIDENTIAL

Does the signal appear at

Pin 67 (Tuner sound signal) and Pin

47, 48 (PC sound) and Pin 56, 57

(DTV sound) and Pin 53, 54 (DVD

sound) Pin 50, 51 (VCR) of

IC 919 (MSP3451)?

Check the CN403 (PC conector) and the

CN407, CN408, CN412, 413 and the

CN200 (CN002) and the CN888 (Tuner)

and the CN702_1.

Yes

Does the signal appear at Pin 27,

28 of IC919 (MSP3451)?

Check the IC919 and

related circuit of IC919.

Yes

Does the signal appear

at L501 ~L504?

Check the IC501 (Audio amp) and

related circuit of IC501.

Yes

Replace the speaker.

5-4 No Sound

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