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Chassis: ES15SO, ES17SO Model: LS15E23C, LS17E24C
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CONFIDENTIAL
TFT-LCD MONITOR
Chassis Model
ES15SO LS15E23C
ES17SO LS17E24C
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. Schematic Diagrams
11. Panel Description
CONFIDENTIAL
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
(READING SHOULD
circuit board. NOT BE ABOVE 0.5mA)
2. Disconnect the AC power and DC Power Jack
before servicing. DEVICE
LEAKAGE
CURRENT
UNDER TESTER
1-1-2 Servicing the LCD Monitor TEST
TEST ALL
EXPOSED METAL
1. When servicing the LCD Monitor disconnect the SURFACES
AC line 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
PLUG AS REQUIRED) EARTH
1-1-3 Fire and Shock Hazard GROUND
Before returning the monitor 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 4. With the unit completely reassembled, plug the AC
leads are not pinched or that hardware is not line cord directly into a 120V AC outlet. With the
lodged between the chassis and other metal parts in unit's AC switch first in the ON position and then
the monitor. OFF, measure the current between a known earth
2. Inspect all protective devices such as nonmetallic ground (metal water pipe, conduit, etc.) and all
control knobs, insulating materials, cabinet backs, exposed metal parts, including: metal cabinets,
adjustment and compartment covers or shields, screwheads and control shafts. The current
isolation resistor-capacitor networks, mechanical measured should not exceed 0.5 milliamp. Reverse
insulators, etc. the power-plug prongs in the AC outlet and repeat
3. Leakage Current Hot Check (Figure 1-1): the test.
WARNING: Do not use an isolation transformer during
this test. 1-1-4 Product Safety Notices
Use a leakage current tester or a metering system
Some electrical and mechanical parts have special
that complies with American National Standards
safety-related characteristics which are often not
Institute (ANSI C101.1, Leakage Current for
evident from visual inspection. The protection they give
Appliances), and Underwriters Laboratories (UL may not be obtained by replacing them with
Publication UL1410, 59.7). 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.
LS15E23C/LS17E24C 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 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 LS15E23C/LS17E24C
CONFIDENTIAL
2 Product Specifications
2-1 Specifications
Description
Item
LS15E23C LS17E24C
LCD Panel TFT-LCD panel, RGB vertical stripe, normally TFT-LCD panel, RGB vertical stripe, normally
white, 15-Inch viewable, 0.297 mm pixel pitch white, 17-Inch viewable, 0.264 mm pixel pitch
Scanning Frequency Horizontal : 30 KHz ~ 69 KHz (Automatic) 30 KHz ~ 81 KHz (Automatic)
Vertical : 56 Hz ~ 75 Hz (Automatic) 56 Hz ~ 75 Hz (Automatic)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1024 Pixels 1280 Pixels
Vertical : 768 Pixels 1024 Pixels
Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75 , internally terminated
Input Sync Signal Type : Separate H/V
automatic synchronization without external switch of sync type
Level : TTL level
Maximum Pixel Clock rate 95 MHz 135 MHz
Active Display 304.1 mm / 228.1 mm 338.1 mm / 270.1 mm
Horizontal/Vertical
AC power voltage & Frequency AC 90 ~ 264 Volts, 60 / 50 Hz ± 3 Hz
Power Consumption 48 W (Max), (2W Power surge) 58 W (Max), (2W Power surge)
Dimensions
Unit (W x D x H) 18.6 x 12.4 x 2.0 Inches (474 x 317 x 51 mm) 20.8 x 14.4 x 2.2 Inches (530 x 367 x 57 mm)
With stand (W x D x H) 18.6 x 15.6 x 8.0 Inches (474 x 397 x 204 mm) 20.8 x 17.6 x 8.0 Inches (530 x 447 x 204 mm)
Weight 3.97 Kg (8.75 Ibs) 4.95 Kg (10.9 Ibs)
Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)
Humidity : 10 % ~ 80 %
Storage Temperature : -13 °F ~ 113 °F (-25 °C ~ 45 °C)
Humidity : 5 % ~ 95 %
Tuning Frequency Synthesize
TV System Color PAL, NTSC, SECAM
Sound BTSC, ECJ, KOREA
Antenna Input 75, Coaxial Cable
MAX internal speaker Out : Right => 3W Right => 5W
Left => 3W Left => 5W
Sound Characteristic
BASS Control Range : -12dB~ + 12dB
TREBLE Control Range : -12dB~ + 12dB
Headphone Out: RF => 5mW max (400m Vrms)
A/V => 10mW max (580 Vrms), Max input sound: -9dBm
Output Frequency : RF => 80 Hz ~ 15 KHz
A/V => 80 Hz ~ 20 KHz
LS15E23C/LS17E24C 2-1
2 Product Specifications
CONFIDENTIAL
2-2 Pin Assignments
Sync
Type Separate H/V Composite H/V Sync-on-green
Pin No.
1 Red Red Red
2 Green Green Green + H/V Sync.
3 Blue Blue Blue
4 GND GND GND
5 GND (DDC Return) GND (DDC Return) GND (DDC Return)
6 GND-Red GND-Red GND-Red
7 GND-Green GND-Green GND-Green
8 GND-Blue GND-Blue GND-Blue
9 No Connection No Connection Not Used
10 GND-Sync./Self Test GND-Sync./Self Test GND-Sync./Self Test
11 GND GND GND
12 DDC Data DDC Data DDC Data
13 Horizontal sync. H/V-Sync. Not Used
14 Vertical sync. Not Used Not Used
15 DDC Clock DDC Clock DDC Clock
2-2 LS15E23C/LS17E24C
2 Product Specifications
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.
Table 2-1 Timing Chart
Mode IBM VESA
VGA2/ VGA3/
640/75 Hz 640/85 Hz 800/75 Hz 800/85 Hz 1024/60Hz 1024/75Hz 1024/85Hz 1280/76Hz 1280/75Hz
70 Hz 60 Hz
640 x 480 640 x 480 800 x 600 800 x 600 1024 x 768 1024 x 768 1024x768 1280x1024 1280x1024
Timing 720 x 400 640 x 480 (17" Only) (17" Only)
fH (KHz) 31.469 31.469 37.500 43.269 46.875 53.674 48.363 60.023 68.677 81.129 79.976
A µsec 31.777 31.778 26.667 23.111 21.333 18.631 20.677 16.660 14.561 16.640 12.504
B µsec 3.813 3.813 2.032 1.556 1.616 1.138 2.092 1.219 1.016 6.400 1.067
C µsec 1.589 1.589 3.810 2.222 3.232 2.702 2.462 2.235 2.201 2.880 1.837
D µsec 26.058 26.058 20.317 17.778 16.162 14.222 15.754 13.003 10.836 9.481
E µsec 0.318 0.318 0.508 1.556 0.323 0.569 0.369 0.203 0.508 3.200 0.119
fV (Hz) 70.087 59.940 75.000 85.008 75.000 85.061 60.004 75.029 84.997 76.106 75.025
O msec 14.268 16.683 13.333 11.764 13.333 11.756 16.666 13.328 11.765 10.660 13.329
P msec 0.064 0.064 0.080 0.671 0.064 0.056 0.124 0.050 0.044 0.080 0.038
Q msec 0.858 0.794 0.427 0.578 0.448 0.503 0.600 0.466 0.524 3.200 0.475
R msec 13.155 15.761 12.800 11.093 12.800 11.179 15.880 12.795 11.183 12.804
S msec 0.191 0.064 0.027 0.023 0.021 0.019 0.062 0.017 0.015 0.020 0.013
Clock
Freq. 28.322 25.175 31.500 49.500 49.500 56.250 75.000 78.750 94.500 135.000 135.000
(MHz)
Polarity
H.Sync Negative Negative Negative Negative Positive Positive Negative Positive Positive Negative Positive
V.Sync Positive Negative Negative Negative Positive Positive Negative Positive Positive Negative Positive
Remark Separate Separate Separate Separate Separate Separate Separate Separate Separate Com. Separate
Separate Sync H/V Composite Sync
VIDEO
A Q R S
Horizontal Vertical
Horizontal Vertical
Video
Video Video
Video P
B O
CC DD E E Q Q RR S S
Sync-on-Green
Sync
Sync Sync
Sync Vertical
Green
B
B PP
Horizontal
AA O O P Q R S
B O
A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width
C : Back porch D : Active time Q : Back porch R : Active time
E : Front porch S : Front porch
LS15E23C/LS17E24C 2-3
2 Product Specifications
CONFIDENTIAL
Memo
2-4 LS15E23C/LS17E24C
CONFIDENTIAL
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
LS15E23C/LS17E24C 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. Remove the 4 screws (Rear Cover + Stand) on
the rear cover.
2. Remove the Assy Stand from rear cover.
3. Remove the 3 screws (Rear Cover + Cover
Front) on the rear.
LS15E23C/LS17E24C 3-1
3 Disassembly and Reassembly
CONFIDENTIAL
4. Lift up the rear cover until it opens
completely.
3-2 Reassembly
Reassembly procedures are in the reverse order of dissasembly procedures.
3-2 LS15E23C/LS17E24C
CONFIDENTIAL
4 Alignments and Adjustments
4-1 General Alignment Instruction
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 results.
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 transformer.
LS15E23C/LS17E24C 4-1
4 Alignments and Adjustments
CONFIDENTIAL
4-2 Adjustment Instruction
4-2-1 Service Mode Screen
1. Adjustment RGB Contrast 24
RGB Bright d3
R Gain d
G Gain d
B Gain d
FB Gain d
2. Options Help Osd : off
TTX List : off
High D : on
Channel Table
Eeprom Clear
3. Auto Color Auto color (PC)
Auto color (TV)
4. Reset
4-2-2 Service function
1. EEPROM Clear : Initially executed when replacing OTP.
2. TV Auto Color : Used to adjust TV image color.
3. PC Auto Color : Used to adjust PC image color.
4. Reset : Used after all adjustments.
5. Other functions shown are not service related.
4-2-3 Adjustment Sequence for ROM change only
EEPROM Clear TV auto color PC auto color RESET
(For ROM
change only)
4-2 LS15E23C/LS17E24C
CONFIDENTIAL
5 Troubleshooting
5-1 No Power
Does proper DC 14 V appear at No
Check SMPS PCB and Adapter.
DC jack connected to CN12?
Yes
Does proper DC 5 V appear at No
Check IC11.
Pin 4 of IC11?
Yes
Does proper DC 14V appear at No
Check IC11.
Pin 1 of IC11?
Yes
Does proper DC 3.3 V appear at No
Check IC14.
Pin 3 of IC14?
Yes
Does proper DC 2.5 V appear at No
Check IC109 and IC17.
Pin 4 of IC109 and IC17?
Yes
Check IC23.
LS15E23C/LS17E24C 5-1
5 Troubleshooting
CONFIDENTIAL
5-2 No Video (PC Signal)
Power indicator is green.
Yes
Does the signal appear No
at C134, C135, C136 Check CN11.
of R, G, B input?
Yes
Does the clock pulse No
Check X21 and related circuit of X21.
appear at X21?
Yes
Does the clock pulse appear at No
output of 15" Check related circuit of IC32.
17".
Yes
Does the clock pulse appear at
No
output of 15" Check related circuit of IC61, IC62.
17".
Yes
Replace LCD Panel.
5-2 LS15E23C/LS17E24C
5 Troubleshooting
CONFIDENTIAL
5-3 No Picture (TV, Video, S-Video)
Check Pin 55, 56 (S-Video)
and Pin 52 (VCR) and Pin 74 No Check CN41 (Tuner) and
and Pin 53 (RF-CVBS) CN26 (VCR connector).
of IC401 (VSP9407).
Yes
Does the signal No Check IC401 (VSP9407)
appear at RA33, RA34? and related circuit.
Yes
Does signal appear at
15" No
17" Check IC32 and related circuit.
of related IC32.
Yes
Check IC61, 62 and
15"
17".
LS15E23C/LS17E24C 5-3
5 Troubleshooting
CONFIDENTIAL
5-4 No Sound
Does the signal appear at
Pin 67 (Tuner sound signal) and Pin Check CN51 (PC conector)
No
57, 56 (PC sound) and Pin 51, 50 (VCR and CN26(VCR connector) and
sound) and Pin 53,54(component) of CN25(component connector).
IC53 (MSP3411G)?
Yes
Does the signal appear at Pin 27, No
Check IC32 and related circuit.
28 of IC53 (MSP3411G)?
Yes
Does the signal appear No
Check IC55 (Audio amp) and related circuit.
at L53~L56?
Yes
Replace the speaker.
5-4 LS15E23C/LS17E24C
CONFIDENTIAL
6 Exploded View and Parts List
6-1-1 LS15E23C
LS15E23C/LS17E24C 6-1
6 Exploded View & Parts List
CONFIDENTIAL
6-1-2 LS15E23C Front
5
9
2
5
6
11 5
7
3
8 4 5
10 1
6-2 LS15E23C/LS17E24C
6 Exploded View & Parts List
CONFIDENTIAL
6-1-3 LS15E23C Rear
2
1
3
LS15E23C/LS17E24C 6-3
6 Exploded View & Parts List
CONFIDENTIAL
6-1-4 LS15E23C Stand
3
2
4
5
1
6
7
8
9
6-4 LS15E23C/LS17E24C
6 Exploded View & Parts List
CONFIDENTIAL
6-2-1 LS17E24C
LS15E23C/LS17E24C 6-5
6 Exploded View & Parts List
CONFIDENTIAL
6-2-2 LS17E24C Front
5
9
2
5
6
11 5
7
3
8 4 5
10 1
6-6 LS15E23C/LS17E24C
6 Exploded View & Parts List
CONFIDENTIAL
6-2-3 LS17E24C Rear
2
1
3
LS15E23C/LS17E24C 6-7
6 Exploded View & Parts List
CONFIDENTIAL
6-2-4 LS17E24C Stand
3
10 2
4
5
1
6
7
8
9
6-8 LS15E23C/LS17E24C
CONFIDENTIAL
8 Block Diagram
LS15E23C/LS17E24C 8-1
8 Block Diagrams
CONFIDENTIAL
Memo
8-2 LS15E23C/LS17E24C
CONFIDENTIAL
9 Wiring Diagram
17,24
7,14,
1~3
4~6
30
29
28
27
26
25
23
22
21
20
19
18
16
15
13
12
11
10
9
8
TX0-
TX0+
TX1-
TX1+
TX2-
TX2+
TXCLK-
TXCLK+
TX3-
TX3+
TX0-
TX0+
TX1-
TX1+
TX2-
TX2+
TXCLK-
TXCLK+
TX3-
TX3+
GND
NC
5V
CN61 CN62
NC
7
KEY0
KEY1
NC
KEY2
CN21 KEY3
NC
KEY4
KEY5
KEY6
SPK OUT R+
CN53 SPK OUT -R-
NC CN13
SPK OUT L+
CN52 NC
SPK OUT L-
AUDIO R IN
LED_GRN
AUDIO L IN
LED_RED
GND
GND
5V CN22 VCR CVB S
YIN
IRRCVR
CIN
GND
CN26 GND
NC
HP-R
HP-L
GND
MODE
CN12 CN11 CN51 CN24 CN25
COM1-PR
GND
COM1-PB
GND
COM1-Y
GND
COM1-L
COM1-R
GND
COM1-R
COM1-L
GND
NC
NC
NC
LS15E23C/LS17E24C 9-1
9 Wiring Diagrams
CONFIDENTIAL
Memo
9-2 LS15E23C/LS17E24C
CONFIDENTIAL
10 Schematic Diagrams
10-1 Power EOS_VE_ASIA Part Schematic Diagram
+5V_CPU IS ALWAYS ACTIVE +3.3V_JAG IS ALWAYS ACTIVE +2.5V_A_JAG & +2.5V_D_JAG IS ALWAYS ACTIVE
+14V_IN +14V_IN +5V_CPU
CN12 L111
+5V_CPU +2.5V_A_JAG +5V_CPU +2.5V_D_JAG
dcjhp_7 +5V_CPU +3.3V_JAG
TP149
TP150
1 1 IC109 IC17
U492
L12 C142
1
2
3 IC11 D11 IC14 KA317MR LM317SX
100nF
1
2 LM2596S-5.0 SS24 BA033FP
A
B
TP115 GND1 6 1 IN OUT 3 1 1 4 1 1 2 1
VIN VOUT VIN VOUT_1
4 GND
F_B