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TFT-LCD MONITOR
Chassis Model
NB21BS 213T
SERVICE Manual
TFT-LCD 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. PCB Layout
11. Schematic Diagrams
12. Panel Description
Samsung Electronics Co.,Ltd.
416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea, 442-742.
Printed in Korea
P/N : BN82-00096A-00
http : //www.samsungmonitor.com (SyncMaster Worldwide)
http : //www.samsung-monitor.com (SyncMaster USA)
URL : http://ecms. samsungelectronics. com/
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
(READING SHOULD
NOT BE ABOVE 0.5mA)
1. For continued safety, do not attempt to modify the
circuit board.
LEAKAGE
2. Disconnect the AC power and DC Power Jack DEVICE
UNDER
CURRENT
TESTER
before servicing. TEST
TEST ALL
1-1-2 Servicing the LCD Monitor EXPOSED METAL
SURFACES
1. When servicing the LCD Monitor Disconnect the 2-WIRE CORD
AC line cord from the AC outlet.
2. It is essential that service technicians have an ALSO TEST WITH
accurate voltage meter available at all times. Check PLUG REVERSED
(USING AC ADAPTER
the calibration of this meter periodically. PLUG AS REQUIRED) EARTH
GROUND
1-1-3 Fire and Shock Hazard Figure 1-1. Leakage Current Test Circuit
Before returning the monitor to the user, perform the
4. With the unit completely reassembled, plug the AC
following safety checks:
line cord directly into a 120V AC outlet. With the
1. Inspect each lead dress to make certain that the unit's AC switch first in the ON position and then
leads are not pinched or that hardware is not OFF, measure the current between a known earth
lodged between the chassis and other metal parts in ground (metal water pipe, conduit, etc.) and all
the monitor. exposed metal parts, including: metal cabinets,
2. Inspect all protective devices such as nonmetallic screwheads and control shafts. The current
control knobs, insulating materials, cabinet backs, measured should not exceed 0.5 milliamp. Reverse
adjustment and compartment covers or shields, the power-plug prongs in the AC outlet and repeat
isolation resistor-capacitor networks, mechanical the test.
insulators, etc.
3. Leakage Current Hot Check (Figure 1-1): WARNING: 1-1-4 Product Safety Notices
Do not use an isolation transformer during this test.
Some electrical and mechanical parts have special
Use a leakage current tester or a metering system safety-related characteristics which are often not
that complies with American National Standards evident from visual inspection. The protection they give
Institute (ANSI C101.1, Leakage Current for may not be obtained by replacing them with
Appliances), and Underwriters Laboratories (UL components rated for higher voltage, wattage, etc. Parts
Publication UL1410, 59.7). 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.
213T 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
1. Always unplug the unit's AC power cord from the 4. Check the insulation between the blades of the AC
AC power source and disconnect the DC Power plug and accessible conductive parts (examples:
Jack before attempting to: metal panels, input terminals and earphone jacks).
(a) remove or reinstall any component or assembly, 5. Insulation Checking Procedure: Disconnect the
(b) disconnect PCB plugs or connectors, (c) connect power cord from the AC source and turn the power
a test component in parallel with an electrolytic switch ON. Connect an insulation resistance meter
capacitor. (500 V) to the blades of the AC plug.
2. Some components are raised above the printed The insulation resistance between each blade of the
circuit board for safety. An insulation tube or tape AC plug and accessible conductive parts (see
is sometimes used. The internal wiring is above) should be greater than 1 megohm.
sometimes clamped to prevent contact with
6. Always connect a test instrument's ground lead to
thermally hot components. Reinstall all such
the instrument chassis ground before connecting
elements to their original position.
the positive lead; always remove the instrument's
3. After servicing, always check that the screws, 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.
1. Immediately before handling any semiconductor 6. Do not remove a replacement ESD from its
components or assemblies, drain the electrostatic protective package until you are ready to install it.
charge from your body by touching a known earth Most replacement ESDs are packaged with leads
ground. Alternatively, wear a discharging wrist- that are electrically shorted together by conductive
strap device. To avoid a shock hazard, be sure to foam, aluminum foil or other conductive materials.
remove the wrist strap before applying power to 7. Immediately before removing the protective
the monitor. material from the leads of a replacement ESD,
2. After removing an ESD-equipped assembly, place it touch the protective material to the chassis or
on a conductive surface such as aluminum foil to circuit assembly into which the device will be
prevent accumulation of an electrostatic charge. installed.
3. Do not use freon-propelled chemicals. These can Caution: Be sure no power is applied to the
generate electrical charges sufficient to damage chassis or circuit and observe all
ESDs. other safety precautions.
4. Use only a grounded-tip soldering iron to solder or
desolder ESDs. 8. Minimize body motions when handling
unpackaged replacement ESDs. Motions such as
5. Use only an anti-static solder removal device. Some brushing clothes together, or lifting your foot from
solder removal devices not classified as "anti-static" a carpeted floor can generate enough static
can generate electrical charges sufficient to damage electricity to damage an ESD.
ESDs.
1-2 213T
2 Product Specifications
2-1 Specifications
Item Description
LCD Panel TFT-LCD panel, RGB vertical stripe, normally black transmissive,
21.03-Inch (24.06-Inch) viewable, 0.27 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 81 kHz (Anolog) 30 kHz ~ 75 kHz (Digital)
Vertical : 56 Hz ~ 75 Hz (~SXGA), 60 Hz (UXGA) 56 Hz ~ 75 Hz (~SXGA), 60 Hz (UXGA)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1600 Pixels
Vertical : 1200 Pixels
Input Video Signal Analog, 0.7 Vp-p