Samsung LW17N23W Schematic
TFT-LCD TV
Chassis Model
VR17EO LW17N23W
SERVICE
Manual
TFT-LCD TV 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
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.
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.
LW17N23W 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 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 LW17N23W
2 Product Specifications
2-1 Specifications
Item
LCD Panel TFT-LCD panel, RGB vertical stripe, normaly,
Scanning Frequency Horizontal : 30 kHz ~ 38 kHz (Automatic)
Vertical : 56 Hz ~ 85 Hz (Automatic)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1280 Pixels
Vertical : 768 Pixels
Input Video Signal Positive at 75 Ω
Input Sync Signal Type : Separate H/V
Level : TTL level
Maximum Pixel Clock rate 70 MHz
Active Display
Horizontal/Vertical
AC power voltage & Frequency
Power Consumption 70 W (Max)
Set Dim (W x D x H)
Package Dim 557.0 X 473.0 X 175.0 mm (21.9 X18.6 X6.9 Inches)
376.56 mm / 274.32 mm
AC 100 ~ 260 Volts, 50~60 Hz ± 3 Hz, DC 14V / 4.5A
463.8 X 179.0 X 363.7 mm (18.3 X 7.0 X 14.3 Inches) After installation of Stand
463.8 X 87.7 X 345.0 mm (18.3
X
3.5 X13.6 Inches) Without Stand
Description
white 17-Inch viewable, 0.2895 mm pixel pitch
Weight
Set/Package 4.72 kg (10.4 lbs) / 7.22 kg (15.9 lbs)
Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)
Operating Humidity : 10 % ~ 80 %
Storage Temperature : -4 °F ~ 113 °F (-20 °C ~ 45 °C)
Storage Humidity : 5 % ~ 95 %
Tunning Frequency Synthesize
TV System
Antena Input 75Ω
– MAX Internal speaker Out : Right => 3W
Sound Characteristic
– BASS Control Range : -8 dB ~ + 8dB
– TREBLE Control Range : -8 dB ~ +8 dB
– Headphone Out : 5 mW max (400 m Vrms)
– Output Frequency : 20 Hz ~15.2 Hz
System PAL/SECAM-B/G/I/D/K/L/L’, NTSC (AV)
Sound FM, STEREO, NICAM
Left => 3W
LW17N23W 2-1
2 Product Specifications
2-2 Pin Assignments
2-2-1 D-SUB
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
2-2-2 SCART
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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
SC1 RED OUT
SC1 RED IN
SC1 LEFT OUT
GND
GND
SC1 LEFT IN
SC1 BLUE
SC1 SWITCHING
GND
N/C
SC1 GREEN
N/C
GND
GND
Separate
Pin
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Separate
SC1 RED
GND
SC1 FAST BLANKING
GND
SC1 CVBS OUT
SC1 CVBS IN
GND
SC2 RED OUT
SC2 RED IN
SC2 LEFT OUT
GND
GND
SC2 LEFT IN
N/C
Pin
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Separate
SC2 SWITCHING
GND
N/C
N/C
N/C
GND
GND
N/C
N/C
GND
GND
SC2 CVBS OUT
SC2 CVBS IN
GND
2-2-3 S-Video
Pin
1
2
3
4
5
2-2 LW17N23W
Separate
GND
Y
C
GND
GND
2-2-4 A/V
RCA Yellow
RCA White
RCA Red
CVBS
Audio L
GND
Audio R
GND
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 LCD Panel Mode1 mode
LW17N23W 2-3
2 Product Specifications
2-3-2 Supported Modes
2-4 LW17N23W
2-3-3 Supported Modes
2 Product Specifications
LW17N23W 2-5
2 Product Specifications
2-3-4 Supported Modes
2-6 LW17N23W
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
LW17N23W 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.
3. R/Cover opening jig : BH81-00001A
1. Loacte the monitor on the cushioned table
with face down. Remove the stand from
LCD-TV and pull the rear cover.
2. Remove 2 screws from the rear cover and
remove rear cover by using opening jig.
3. Lift up the rear cover and disconnect function
cable and audio cable from the shield.
4. Disconnect IR cable and speaker cable from
the shield. (see illustrations)
5. Remove 10 screws from the shield and lift up
the shield. (see illustrations)
LW17N23W 3-1
3 Disassembly and Reassembly
3-2 Replacement Order of Lamp Assemblies
6. Remove 4 screws from the main board and
disconnect cable. (see illustrations)
7. Lift up the panel.
LCD panal may not be serviced. (Lamps are generally located at top and bottom of panel, which may be
replaced.However,for the Victoria LTA170WP_L01 panel, the lamp is firmly soldered inside of the back
panel. Therefore,servicing the lamp may cause a defective panel.Also,servicing lamp requires front glass
removal, which may cause scratch and/or foreign materials on the glass.)
3-3 Reassembly
Reassembly procedures are in the reverse order of dissasembly procedures.
3-2 LW17N23W
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.
LW17N23W 4-1
4 Alignments and Adjustments
002C 0050
INFO MENU
19Day 07h 14m
TTX List Flop
002C 0050
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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
4-2 LW17N23W
4 Alignments and Adjustments
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LW17N23W 4-3
4 Alignments and Adjustments
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4-4 LW17N23W
4 Alignments and Adjustments
4-3 White Balance Adjustment
1. In factory mode (1, 3, 6), you can adjust the white balance.
2. As the adjustment and data values differ depending on input sources, different adjustments are
requried for RF and PC modes.
3. Optimum condition data for each mode are saved as default values. (Refer to Table 2, 3)
4. As the RF mode is applied with the same vlaues as for VIDEO and S-VIDEO, adjustment can be
made in any of RF, VIDEO and S-VIDEO modes.
Table 4-1. White Balance Setting Conditions
Table 4-2. Color Control Default Vlaue
Table 4-3. ADC Default Vlaue
LW17N23W 4-5
4 Alignments and Adjustments
4-3-1 Conditions for Measurement
1. On the basis of toshiba ABL pattern : High Light level (57 IRE)
- INPUT SIGNAL GENERATOR : MSPG-925LTH
2. Optical measuring device : CA210 (FL)
4-3-2 Method of Adjustment
1. Adjust the basic level of PC input signals.
a) Set the input to the mode in which the adjustment will be made (PC).
* Input signal
- PC Mode : Model #21 (1024*768 Mode), Pattern #16 (Picture 4-1)
b) Enter factory PC Calibration, confirm the ADC data (PC Mode Only).
* ADC default value : Table 4-3.
Picture 4-1 Toshiba ABL Pattern
2. Adjust the white balance of RF, PC Modes.
a) Set the input to the mode in which the adjustment will be made (RF PC).
* Input signal - RF Mode : Model #1 (750*480 Mode), Pattern #16
- PC Mode : Model #21 (1024*768 Mode), Pattern #16
b) Enter factory color control, confirm the data.
4-6 LW17N23W
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