Samsung GH15DS Schematic
TFT-LCD MONITOR
GH15DS
SERVICE
Manual
TFT-LCD MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Troubleshooting
5. Exploded View & Parts List
6. Electrical Parts List
7. Block Diagram
8. Wiring Diagram
9. Schematic Diagrams
10. Panel Description
1 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
!
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.
3. When the chassis is operating, semiconductor
heatsinks are potential shock hazards.
1-1-2 Servicing the LCD Monitor
1. When servicing the LCD Monitor, remove the static
charge by connecting a 10k ohm resistor in series
with an insulated wire (such as a test probe)
between the chassis and the anode lead.
(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).
4. With the unit completely reassembled, plug the AC
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
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.
Figure 1-1. Leakage Current Test Circuit
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.
on schematics and parts lists. A substitute
GH15DS 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
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 devices are integrated circuits and some fieldeffect 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 GH15DS
2 Product Specifications
2-1 Specifications
Item
LCD Panel TFT-LCD panel, RGB vertical stripe, normaly white,15-Inch viewable,
0.297 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 60 kHz
Vertical : 56 Hz ~ 75 Hz
Display Colors 16.2 Million colors
Maximum Resolution Horizontal : 1024 Pixels
Vertical : 768 Pixels
Input Video Signal VESA TMDS
Input Sync Signal Encoded by TMDS
Maximum Pixel Clock rate 80 MHz
Active Display Horizontal : 304 mm Vertical : 228 mm
AC power voltage & Frequency AC 90 ~ 260 Volts, 60/50 Hz ± 3 Hz
Power Consumption On : 30 W (max) / Saving : 3W (max) / Switch - off : 1W (max)
Dimensions
Unit (W x D x H)
With Simple Stand
Without Simple stand
With Pivot Stand
Without Pivot Stand
15.4 x 15.1 x 6.8 Inches (391.4 x 383.6 x 173 mm)
15.4 x 11.5 x 2.5 Inches (391.4 x 292.8 x 64.0 mm)
15.4 x 15.1 x 6.8 Inches (391.4 x 383.6 x 173 mm)
15.4 x 17.1 x 6.8 Inches (391.4 x 433.6 x 173 mm)
15.4 x 11.5 x 2.5 Inches (391.4 x 292.8 x 64.0 mm)
Description
Weight (Net/Gross) 4.2 kg (9.3 lbs) / 5.2 kg (11.5 lbs)
Environmental Considerations Operating Temperature : 50°F ~ 104°F (10°C ~ 40°C)
Humidity : 10 % ~ 80 %
Storage Temperature : -3.2°F ~ 140°F (-20°C ~ 60°C)
Humidity : 5 % ~ 95 %
•GH15DS comply with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.
•Designs and specifications are subject to change without prior notice.
GH15DS 2-1
2 Product Specifications
2-2 DVI Signal Pin Assignments - Main Pin Field (GH15DS)
Pin Signal Assignment Pin Signal Assignment Pin Signal Assignment
1 T.M.D.S. Data2- 9 T.M.D.S. Data1- 17 T.M.D.S. Data0-
2 T.M.D.S. Data2+ 10 T.M.D.S. Data1+ 18 T.M.D.S. Data0+
3 T.M.D.S. Data2 Return 11 T.M.D.S. Data1 Return 19 T.M.D.S. Data0 Return
4NC 12NC 20NC
5NC 13NC 21NC
6 DDC Clock 14 +5V Power 22 T.M.D.S. Clock Return
7 DDC Data 15 Ground (Self-Raster) 23 T.M.D.S. Clock+
8 NC 16 Hot Plug Detect (+5V) 24 T.M.D.S. Clock-
2-2 GH15DS
2 Product Specifications
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. GH15DS
Table 2-1. Timing Chart
GH15DS 2-3
2 Product Specifications
Table 2-2. Timing Chart
2-4 GH15DS
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