LG SDM-S74 User manual

COLOR MONITOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS NO. : CL-42
MODEL: SDM-S74, SDM-S94

1. LCD CHARACTERISTICS
Type : TFT Color LCD Module
Size : 17 inch (SDM-S74)
19 inch (SDM-S94)
Pixel Pitch :
0.264 (H) x 0.264 (V)
(SDM-S74)
0.294 (H) x 0.294 (V) (SDM-S94)
Color Depth : 16.2M colors (SDM-S74)
16.7M colors (SDM-S94)
Electrical Interface : LVDS
Surface Treatment : Haze 25%, Hard-coating(3H)
Operating Mode : Normally White (SDM-S74)
Black (SDM-S94)
Backlight Unit : Top/Bottom edge side 4-CCFL
(Cold Cathode Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥ 10
(SDM-S74)
Left : -60° min., -70°(Typ) Right : +60° min., +70°(Typ)
Top :+45° min., +60°(Typ) Bottom : -45°min., -60°(Typ)
(SDM-S94)
Left : -85° min. Right : +85° min.
Top :+85° min. Bottom : -85°min.
2-2. Luminance : 250(min), 300(Typ) (SDM-S74)
: 240(min), 300(Typ) (SDM-S94)
2-3. Contrast Ratio : 250(min), 450(Typ) (SDM-S74)
: 400(min), 700(Typ) (SDM-S94)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate Sync,
SOG (Sync On Green)
Composite Sync, Digital
3-2. Video Input Signal
1) Type : R, G, B Analog
2) Voltage Level : 0~0.71 V
a) Color 0, 0 : 0 Vp-p
b) Color 7, 0 : 0.467 Vp-p
c) Color 15, 0 : 0.714 Vp-p
3) Input Impedance : 75 Ω
3-3. Operating Frequency
Horizontal : 28 ~ 80kHz (Digital: ~64kHz)
Vertical : 48 ~ 75Hz (Digital: ~60Hz)
4
. Max. Resolution
Analog : 1280 x 1024 / 75Hz
DVI Analog/ Digital : 1280 x 1024 / 60Hz
5. POWER SUPPLY
5-1. Power
: AC 100~240V, 50/60Hz , 1.0A
5-2. Power Consumption
6. ENVIRONMENT
6-1. Operating Temperature: 0°C~50°C
6-2. Relative Humidity : 10%~80%
6-3. MTBF : 50,000 Hours(Min)
7. DIMENSIONS (with TILT/SWIVEL)
(SDM-S74)
Width : 367mm (14.45'')
Depth : 215 mm (8.46'')
Height : 410 mm (16.14'')
(SDM-S94)
Width : 412mm (16.22'')
Depth : 234 mm (9.21'')
Height : 445 mm (17.51'')
8. WEIGHT (with TILT/SWIVEL)
(SDM-S74)
Net. Weight : 5.7kg (12.56 lbs)
Gross Weight : 8.3kg (18.30 lbs)
(SDM-S94)
Net. Weight : 7.1kg (15.65 lbs)
Gross Weight : 9.4kg (20.72 lbs)
CONTENTS
SPECIFICATIONS
- 2 -
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 4
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 6
WIRING DIAGRAM ................................................. 7
DISASSEMBLY ....................................................... 9
BLOCK DIAGRAM ................................................. 11
DESCRIPTION OF BLOCK DIAGRAM...................12
ADJUSTMENT ...................................................... 14
TROUBLESHOOTING GUIDE .............................. 15
EXPLODED VIEW...................................................19
REPLACEMENT PARTS LIST ...............................21
SCHEMATIC DIAGRAM......................................... 24
less then 1W
less then 0W
less then 1.2W less then 1.0W
240V/50Hz 100V/60Hz
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPMS OFF
POWER S/W OFF
AC POWER OFF
H/V SYNC
ON/ON
ON/OFF
-
-
VIDEO
ACTIVE
OFF
-
-
POWER CONSUMPTION
less than 45 W (SDM-S74)
less than 50 W (SDM-S94)
LED COLOR
GREEN
AMBER
RED
OFF

- 3 -
Signal Connector Pin Assignment
Pin Signal (DVI-D)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
T. M. D. S. Data2-
T. M. D. S. Data2+
T. M. D. S. Data2/4 Shield
T. M. D. S. Data4-
T. M. D. S. Data4+
DDC Clock
DDC Data
Analog Vertical Sync.
T. M. D. S. Data1-
T. M. D. S. Data1+
T. M. D. S. Data1/3 Shield
T. M. D. S. Data3-
T. M. D. S. Data3+
+5V Power
Ground
(return for +5V,
H. Sync. and V. Sync.)
Pin Signal (DVI-D)
18
9
17 24
16 C1
C4
C3
C2
C5
16
17
18
19
20
21
22
23
24
Hot Plug Detect
T. M. D. S. Data0-
T. M. D. S. Data0+
T. M. D. S. Data0/5 Shield
T. M. D. S. Data5-
T. M. D. S. Data5+
T. M. D. S. Clock Shield
T. M. D. S. Clock+
T. M. D. S. Clock-
T. M. D. S. (Transition Minimized Differential Signaling)
• DVI-D Connector (Digital)

PRECAUTION
- 4 -
WARNING FOR THE SAFETY-RELATED COMPONENT.
•There are some special components used in LCD
monitor that are important for safety. These parts are
marked on the schematic diagram and the
replacement parts list. It is essential that these critical
parts should be replaced with the manufacturer’s
specified parts to prevent electric shock, fire or other
hazard.
•Do not modify original design without obtaining written
permission from manufacturer or you will void the
original parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
•Must mount the module using mounting holes arranged
in four corners.
•Do not press on the panel, edge of the frame strongly
or electric shock as this will result in damage to the
screen.
•Do not scratch or press on the panel with any sharp
objects, such as pencil or pen as this may result in
damage to the panel.
•Protect the module from the ESD as it may damage the
electronic circuit (C-MOS).
•Make certain that treatment person’s body are
grounded through wrist band.
•Do not leave the module in high temperature and in
areas of high humidity for a long time.
•The module not be exposed to the direct sunlight.
•Avoid contact with water as it may a short circuit within
the module.
•If the surface of panel become dirty, please wipe it off
with a softmaterial. (Cleaning with a dirty or rough cloth
may damage the panel.)
WARNING
BE CAREFUL ELECTRIC SHOCK !
•If you want to replace with the new backlight (CCFL) or
inverter circuit, must disconnect the AC adapter
because high voltage appears at inverter circuit about
650Vrms.
•Handle with care wires or connectors of the inverter
circuit. If the wires are pressed cause short and may
burn or take fire.
TIMING CHART
VIDEO
SYNC
B
D
CFE
A
CAUTION
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.

- 5 -
Mode H/V
Sort
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
720x400
70Hz
H–35.00 864 640 64 64 96 224
V–66.667Hz 525 480 3 3 39 45
640x480
60Hz
H–37.50 840 640 16 64 120 200
V–75.0Hz 500 480 1 3 16 20
640x480
65Hz
H–31.500 900 720 18 108 54 180
V + 70.156Hz 449 400 12 3 34 49
640x480
75Hz
H–35.162 896 720 34 40 102 176
V–59.901Hz 587 480 12 2 93 107 720x480
60Hz
H +- 35.156 1024 800 24 72 128 224
V + 56.250Hz 625 600 1 2 22 25 800x600
56Hz
H + 37.879 1056 800 40 128 88 256
V + 60.317Hz 628 600 1 4 23 28 800x600
60Hz
H + 48.077 1040 800 56 120 64 240
V + 72.188Hz 666 600 37 6 23 66 800x600
72Hz
H + 46.875 1056 800 16 80 160 256
V + 75.0Hz 625 600 1 3 21 25 800x600
75Hz
H–49.727 1152 832 32 64 224 320
V–74.553Hz 667 624 3 3 37 43
832x624
(MAC16”)
75Hz
H–48.363 1344 1024 24 136 160 320
V–60.004Hz 806 768 3 6 29 38 1024x768
60Hz
H–56.476 1328 1024 24 136 144 304
V–70.069Hz 806 768 3 6 29 38 1024x768
70Hz
H + 60.023 1312 1024 16 96 176 288
V + 75.029Hz 800 768 1 3 28 32 1024x768
75Hz
H–60.241 1328 1024 32 96 176 304
V–74.927Hz 804 768 3 3 30 36
1024x768
(MAC19)
75Hz
H + 67.500 1600 1152 64 128 256 448
V + 75.000Hz 900 864 1 3 32 36 1152x864
75Hz
H–68.681 1456 1152 32 128 144 304
V–75.062Hz 915 870 3 3 39 45
1152x870
(MAC21)
75Hz
H–61.795 1504 1152 30 128 194 352
V–65.950Hz 937 900 2 4 31 37 1152x900
66Hz
H–71.732 1472 1152 16 96 208 320
V–76.068Hz 943 900 2 8 33 43 1152x900
75Hz
H + 31.216 1480 1170 37 129 144 310
V + 50.026Hz 624 584 3 3 34 40 1170x584
50Hz
H + 60.000 1800 1280 96 112 312 520
V + 60.000Hz 1000 960 1 3 36 40 1280x960
60Hz
H + 63.981 1688 1280 48 112 248 408
V + 60.020Hz 1066 1024 1 3 38 42 1280x1024
60Hz
H + 79.976 1688 1280 16 144 248 408
V + 75.025Hz 1066 1024 1 3 38 42 1280x1024
75Hz
Sync
Polarity Frequency
Dot
Clock
Back Porch
(F)
Blanking time
(B)
Resolution
28.350
25.175
30.240
31.500
31.505
36.000
40.000
50.000
49.500
57.285
65.000
75.000
78.750
80.000
108.000
100.000
92.940
105.590
46.200
108.000
108.000
135.000
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
H–31.469 800 640 16 96 48 160
V–59.940Hz 525 480 10 2 33 45
Sync Duration
(D)
Front Porch
(C)
Video Active Time
(A)
Total Period
(E)

- 6 -
OPERATING INSTRUCTIONS
REAR VIEW(SDM-S74) REAR VIEW(SDM-S94)
HD15(RGB) input
connector
Main Power Switch
AC IN connector
DVI-D(Digital) input
connector DVI-D(Digital) input
connector
Main Power Switch
AC IN
connector HD15(RGB) input
connector
1. (Power) switch and (power) indicator
This switch turns the monitor on when the power
indicator lights up in red. To turn the monitor off, press
this switch again.
If the power indicator does not light up, press the MAIN
POWER switch.
2. MENU Button
This button turns the menu screen on and off.
3. Buttons
These buttons are used to select the menu items and
make adjustments.
In addition, these buttons switch the Video input signal
between Input 1 and Input 2 when two computers are
connected to the monitor
4. OK Button
This button actives tge selected menu item and
adjustments made using the buttons(3).
5. ECO Button
This button is used to reduce the power consumption.
Front Control Panel
MENU
INPUT
OK
ECO
1
3
4
2
5

- 7 -
WIRING DIAGRAM
(SDM-S74)
J702
J705
J706
CN001
CN003
Connector Ass’y P/N:
6631T25005K
Connector Ass’y P/N:
6631T10003H
Connector Ass’y P/N:
6631T11016W

- 8 -
J702
J705
J706
WIRING DIAGRAM
(SDM-S94)
Connector Ass’y P/N:
6631T10003H
Connector Ass’y P/N:
6631T11016W
Connector Ass’y P/N:
6631T25005H

- 9 -
DISASSEMBLY(SDM-S74)
1) Please lift the central inside edge of Front bezel
upward with fingertip like picture, then latch will be
departed.
REAR CABINET REMOVEL.
2) Progress to left and lifts bezel furtively and extracts
latch.
3) Progress to right and extracts latch of bezel upper part
by same method.
4) Please pull upper side edge of Rear cabinet outside
with fingertip.
5) Please pull right side edge of Rear cabinet outside with
fingertip.
6) Please pull left side edge of Rear cabinet outside with
fingertip.

DISASSEMBLY(SDM-S94)
- 10 -
REAR CABINET REMOVEL.
2) Progress upward and lifts bezel furtively and extracts
latch.
3) Progress continuously and extracts latch of bezel upper
by same method. 4) Progress continuously and extracts latch of bezel left by same method.
5) Please pull the Rear cabinet both edge outside with
fingertips like picture, then Rear cabinet will be
departed.
6) If Rear cabinet be departed easily, please pull upside
edge of Rear cabinet outside.
1) Please lift the central inside edge of Front bezel
upward with fingertip like picture then latch will be
departed.