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TFT-LCD TV/MONITOR
Chassis Model
NF26SO LS26A33W
SERVICE 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. Parts List
8. Block Diagram
9. Wiring Diagram
10. PCB Layout
11. Schematic Diagrams
12. Panel Description
Samsung Electronics Co.,Ltd.
This Service Manual is a property of 416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Kyungki-Do,
Samsung Electronics Co., Ltd. Korea, 443-742
Any unauthorized use of Manual can be Printed in Korea
punished under applicable International P/N : BN82-00109V-00
and/or domestic law. URL : http://itself.sec.samsung.co.kr/
1 Precautions
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
(READING SHOULD
board. NOT BE ABOVE 0.5mA)
2. Disconnect the AC power and DC Power Jack before
servicing. DEVICE
LEAKAGE
CURRENT
1-1-2 Servicing the LCD TV
UNDER TESTER
TEST
TEST ALL
EXPOSED METAL
1. When servicing the LCD TV Disconnect the AC line SURFACES
cord from the AC outlet.
2-WIRE CORD
2. It is essential that service technicians have an accurate
voltage meter available at all times. Check the
calibration of this meter periodically. ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
1-1-3 Fire and Shock Hazard
PLUG AS REQUIRED) EARTH
GROUND
Before returning the LCD_TV to the user, perform the Figure 1-1. Leakage Current Test Circuit
following safety checks:
1. Inspect each lead dress to make certain that the leads are 4. With the unit completely reassembled, plug the AC line
not pinched or that hardware is not lodged between the cord directly into a 220V AC outlet. With the unit's AC
chassis and other metal parts in the LCD_TV. switch first in the ON position and then OFF, measure
2. Inspect all protective devices such as nonmetallic control the current between a known earth ground (metal water
knobs, insulating materials, cabinet backs, adjustment pipe, conduit, etc.) and all exposed metal parts,
and compartment covers or shields, isolation resistor- including: metal cabinets, screwheads and control shafts.
capacitor networks, mechanical insulators, etc. The current measured should not exceed 0.5 milliamp.
3. Leakage Current Hot Check (Figure 1-1): Reverse the power-plug prongs in the AC outlet and
WARNING: Do not use an isolation repeat the test.
transformer during
this test. 1-1-4 Product Safety Notices
Use a leakage current tester or a metering system that
Some electrical and mechanical parts have special safety-
complies with American National Standards Institute related characteristics which are often not evident from visual
(ANSI C101.1, Leakage Current for Appliances), and inspection. The protection they give may not be obtained by
Underwriters Laboratories (UL Publication UL1410, replacing them with components rated for higher voltage,
59.7). 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.
LS26A33W 1-1
1 Precautions
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 4. Check the insulation between the blades of the AC plug
1. Always unplug the unit's AC power cord from the AC and accessible conductive parts (examples: metal panels,
power source and disconnect the DC Power Jack before input terminals and earphone jacks).
attempting to: 5. Insulation Checking Procedure: Disconnect the power
(a) remove or reinstall any component or assembly, (b) cord from the AC source and turn the power switch ON.
disconnect PCB plugs or connectors, (c) connect a test Connect an insulation resistance meter (500 V) to the
component in parallel with an electrolytic capacitor. blades of the AC plug.
2. Some components are raised above the printed circuit The insulation resistance between each blade of the AC
board for safety. An insulation tube or tape is sometimes plug and accessible conductive parts (see above) should
used. The internal wiring is sometimes clamped to be greater than 1 megohm.
prevent contact with thermally hot components. Reinstall 6. Always connect a test instrument's ground lead to the
all such elements to their original position. instrument chassis ground before connecting the positive
3. After servicing, always check that the screws, lead; always remove the instrument's ground lead last.
components and wiring have been correctly reinstalled.
Make sure that the area around the serviced part has not
been damaged.
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.
6. Do not remove a replacement ESD from its protective
1. Immediately before handling any semiconductor
package until you are ready to install it. Most
components or assemblies, drain the electrostatic charge
replacement ESDs are packaged with leads that are
from your body by touching a known earth ground.
electrically shorted together by conductive foam,
Alternatively, wear a discharging wrist-strap device. To
aluminum foil or other conductive materials.
avoid a shock hazard, be sure to remove the wrist strap
before applying power to the LCD_TV. 7. Immediately before removing the protective material
from the leads of a replacement ESD, touch the
2. After removing an ESD-equipped assembly, place it on a
protective material to the chassis or circuit assembly into
conductive surface such as aluminum foil to prevent
which the device will be installed.
accumulation of an electrostatic charge.
3. Do not use freon-propelled chemicals. These can
Caution: Be sure no power is applied to
generate electrical charges sufficient to damage ESDs. the chassis or circuit and
observe all other safety
4. Use only a grounded-tip soldering iron to solder or
desolder ESDs. precautions.
5. Use only an anti-static solder removal device. Some 8. Minimize body motions when handling unpackaged
solder removal devices not classified as "anti-static" can replacement ESDs. Motions such as brushing clothes
generate electrical charges sufficient to damage ESDs. together, or lifting your foot from a carpeted floor can
generate enough static electricity to damage an ESD.
1-2 LS26A33W
2 Product Specifications
2 Product Specifications
2-1 Specifications
Item Description
LCD Panel TFT-LCD Panel, RGB vertical stripe, normaly Black, 26-Inch viewable, 0.537 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 68 kHz (Automatic)
Vertical : 56 Hz ~ 85 Hz (Automatic)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1280 Pixels
Vertical : 768 Pixel
Input Video Signal Positive at 75
Input Sync Signal Type : Seperate H/V
Level : TTL level
Maximum Pixel Clock rate 80 MHz
Active Display
687.36 mm/ 412.42 mm
Horizontal/Vertical
AC power voltage & Frequency AC 100 - 240V ~, 50/60 Hz
Power Consumption 130 W
Dimensions (W x H x D)
Set 29.17 x 10.89 x 20.70 Inches (741.0 X 276.8 X 526.0 mm) State of stand installed
29.17 x 4.68 x 16.92 Inches (741.0 X 119.0 X 498.5 mm) State of stand disassembled
Package 34.49 x 13.35 x 28.11 Inches (876.0 X 339.0 X 714.0 mm)
Weight
Set / Package 15.0 kg (33.07 lbs) / 16.8 kg (37.04 lbs)
Environmental Considerations Operating Temperature : 50