Samsung ls15s13c service manual

TFT-LCD TV/MONITOR

Chassis Model MB15S* LS15S13C

SERVICE

CONFIDENTIAL

Manual

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

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

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock.

1-1 Safety Precautions

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.

LS15S13C 1-1

1 Precautions

CONFIDENTIAL

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.

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.

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.

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. 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.

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.

1-2 LS15S13C

2 Product Specifications

2-1 Specifications

CONFIDENTIAL

Item

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

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

Vertical : 56 Hz ~ 75 Hz (Automatic)

Display Colors 16.7 Million colors

Maximum Resolution Horizontal : 1024 Pixels

Vertical : 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

Active Display Horizontal/Vertical

AC power voltage & Frequency

Power Consumption 43W (Max)

Dimensions Unit (W x D x H) 13.6 x 6.7 x 14.2 Inches (346.0 x 169.0 x 361.5 mm)

Carton (W x D x H) 16.8 x 4.5 x 21.0 Inches (427 x 114 x 535 mm)

304.1 mm / 228.1 mm

AC 90 ~ 264 Volts, 60 / 50 Hz ± 3 Hz

Description

white, 15-Inch viewable, 0.297 mm pixel pitch

Weight 3.2 Kg / 7.05 Ibs (With Stand)

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 %

Tunning Frequency Synthesize

TV System

Antena Input 75Ω, Coaxial Cable

– MAX Internal speaker Out : Right => 3W

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

System PAL, SECAM, NTSC4.4, NTSC3.58

Sound BG, DK, I , M

Left => 3W

A/V => 80 Hz ~ 15 KHz

LS15S13C 2-1

2 Product Specifications

2-2 Pin Assignments

CONFIDENTIAL

2-2-1 D-SUB

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

Separate

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

2-2-2 DVD, DTV

RCA Green

RCA Blue

RCA Red

RCA White

RCA Red

GND

Pb (Cb)

GND

Pr (Cr)

GND

Audio L

GND

Audio R

GND

2-2-3 S-Video

2-2-4 A/V

RCA Yellow

RCA White

RCA Red

Separate

C GND GND GND

CVBS

Audio L

GND

Audio R

GND

2-2 LS15S13C

2 Product Specifications

µs µs µs µs µs µs µs µs

CONFIDENTIAL

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.

2-3-1 LCD Panel Mode : 1 mode

LS15S13C 2-3

2 Product Specifications

µs µs µs µs

µs

2-3-2 Supported Modes (1)

CONFIDENTIAL

2-4 LS15S13C

2 Product Specifications

µs µs µs µs µs µs µs µs

2-3-2 Supported Modes (2)

CONFIDENTIAL

LS15S13C 2-5

2 Product Specifications

µs µs µs µs µs µs µs µs

65.000

48.363

20.677

15.754

4.923

15.754

0.369

2.092

2.462

Negative

60.004

16.666

15.880

0.786

15.880

0.062

0.124

0.600

2-3-2 Supported Modes (3)

CONFIDENTIAL

2-6 LS15S13C

CONFIDENTIAL

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the LS15S13C 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. The stand is held into the bottom of the unit by a pair of retaining clips (near the left and right hinges) To remove the stand, simply pull it away from the unit and the retaining clips will release automatically.

2. Remove the two phillips screws (left and right).

3. Separate the case halves (front/back) starting at the bottom/edges.

LS15S13C 3-1

3 Disassembly and Reassembly

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

CONFIDENTIAL

3-2 LS15S13C

CONFIDENTIAL

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.

LS15S13C 4-1

4 Alignments and Adjustments

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

CONFIDENTIAL

4-2 LS15S13C

4 Alignments and Adjustments

CONFIDENTIAL

LS15S13C 4-3

4 Alignments and Adjustments

Memo

CONFIDENTIAL

4-4 LS15S13C

5 Troubleshooting

5-1 No Power

CONFIDENTIAL

Does proper DC 14V appear at

DC jack connected to

CN801?(Input Board)

Yes

Does proper DC 3.3V_A

appear at FT852?

Yes

Does proper DC 2.5V_A

appear at Pin 3 of IC802?

Yes

Does proper DC 3.3V_B

appear at FT824?

Check SMPS PCB and Adapter.

Check IC801. (#2)

Check IC802.

Check IC805. (#1)

Yes

Does proper DC 2.5V_B

appear at Pin 3 of IC806?

Check IC806.

WAVEFORMS

IC801 #2

LS15S13C 5-1

IC805 #1

5 Troubleshooting

5-2 No Video (PC Signal, Comp [DTV])

Power indicator is green.

Yes

CONFIDENTIAL

Does the signal appear

3-1

at C306, C398, C397

3-2

4 5

of R, G, B input?

Yes

Does the clock pulse appear at

output of RA351 ~ RA356?

Yes

Does the clock pulse

appear at IC002~IC005?

Yes

Does the signal appear at CR01,

CG01, CB01 of R, G, B output?

Yes

Does the clock pulse appear at

output of RA301~RA306?

Check the CN575.

Check related circuit of IC350.

Check IC001 and related

circuit of IC001.

Check X201 and related

circuit of IC200.

Check IC901 and

related circvit of IC300.

Yes

Replace LCD Panel.

WAVEFORMS

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

3-1

Full White Y Input(C398_DTV)

3-2

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

X201

5-2 LS15S13C

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