LG Flatron L1810B User manual

MENU
SOURCE
AUTO/SELECT
COLOR MONITOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS NO. : CL-42
FACTORY MODEL: LB800K
MODEL: L1810B(LB800K-VL)

1. LCD CHARACTERISTICS
Type : TFT Color LCD Module
Size : 18.1inch(45.974cm diagonal)
Pixel Pitch : 0.2805(H) x 0.2805(V)
Color Depth : 8-bit, 16,777,216 colors
Electrical Interface : LVDS
Surface Treatment : Anti-Glare, Hard Coating(3H)
Operating Mode : Normally Black
Backlight Unit : Six-CCFL (Cold Cathode
Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥ 10
Left : -60° min., -80°(Typ)
Right : +60° min., +80°(Typ)
Top : +60° min., +80°(Typ)
Bottom : -60° min., -80°(Typ)
2-2. Luminance : 200(min), 250(Typ)
2-3. Contrast Ratio : 200(min), 350(Typ)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate, Composite,
SOG (Sync On Green)
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 : 30 ~ 83kHz
Vertical : 56 ~ 75Hz
4. MAX. RESOLUTION
Analog : 1280 x 1024@75Hz
DVI Analog/Digital : 1280 x 1024@60Hz
5. POWER SUPPLY
5-1. Power Adaptor(Built-in Power)
Input : AC 100~240V, 50/60Hz , 1.0A
5-2. Power Consumption
6. ENVIRONMENT
6-1. Operating Temperature: 10°C~35°C (50°F~95°F)
(Ambient)
6-2. Relative Humidity : 10%~80%
(Non-condensing)
6-3. MTBF : 50,000 Hours(Min)
7. DIMENSIONS (with TILT/SWIVEL)
Width : 406 mm (15.98'')
Depth : 223 mm (8.77')
Height : 427 mm (16.81'')
8. WEIGHT (with TILT/SWIVEL)
Net. Weight : 7.8kg (17.19 lbs)
Gross Weight : 10.0kg (22.04 lbs)
9. USB
Upstream : 1 port, Downstream : 2 port
Speed : Full-12Mbps, Low-1.5Mbps
CONTENTS
SPECIFICATIONS
- 2 -
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 4
TIMING CHART ....................................................... 5
OPERATING INSTRUCTIONS ................................ 6
WIRING DIAGRAM ................................................. 8
BLOCK DIAGRAM ................................................... 9
DESCRIPTION OF BLOCK DIAGRAM...................10
ADJUSTMENT ...................................................... 12
TROUBLESHOOTING GUIDE .............................. 13
PRINTED CIRCUIT BOARD................................... 18
EXPLODED VIEW...................................................22
REPLACEMENT PARTS LIST ...............................24
PIN CONFIGURATION............................................28
SCHEMATIC DIAGRAM......................................... 31
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
OFF
POWER OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
-
POWER CONSUMPTION
less than 53 W
less than 3 W
less than 3 W
less than 3 W
less than 1 W
LED COLOR
GREEN
AMBER
AMBER
AMBER
OFF
VIDEO
ACTIVE
OFF
OFF
OFF
-

- 3 -
Signal Connector Pin Assignment
Pin Signal (DVI-I)
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-I)
18
9
17 24
16 C1
C4
C3
C2
C5
16
17
18
19
20
21
22
23
24
C1
C2
C3
C4
C5
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-
Analog Red
Analog Green
Analog Blue
Analog H. Sync.
Analog Ground
T. M. D. S. (Transition Minimized Differential Signaling)
• DVI-I Connector (Digital/Analog)

- 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.
PRECAUTION
CAUTION
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.

TIMING CHART
- 5 -
VIDEO
SYNC
B
D
CFE
A
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
H + 31.469 800 640 16 96 48
V–70.8 449 350 37 2 60
H + 37.879 1056 800 40 128 88
V + 60.317 628 600 1 4 23
H–31.469 800 640 16 96 48
V–59.94 525 480 10 2 33
H–37.5 840 640 16 64 120
V–75 500 480 1 3 16
H–31.468 900 720 18 108 54
V + 70.09 449 400 12 2 35
H + 46.875 1056 800 16 80 160
V + 75.0 625 600 1 3 21
H+/–49.725 1152 832 32 64 224
V+/–74.55 667 624 1 3 39
H–48.363 1344 1024 24 136 160
V–60.0 806 768 3 6 29
H–60.123 1312 1024 16 96 176
V–75.029 800 768 1 3 28
H+/–68.681 1456 1152 32 128 144
V+/–75.062 915 870 3 3 39
H+/–61.805 1504 1152 18 134 200
V+/–65.96 937 900 2 4 31
H + 63.981 1688 1280 48 112 248
V + 60.02 1066 1024 1 3 38
H + 79.976 1688 1280 16 144 248
V + 75.035 1066 1024 1 3 38
Mode H/V
Sort
1
2
3
4
5
6
7
8
9
10
11
12
13
25.175
28.321
25.175
31.5
40.0
49.5
57.283
65.0
78.75
100.0
92.978
108.0
135.0
640x350
70Hz
800x600
60Hz
640x480
60Hz
640x480
75Hz
720x400
70Hz
800x600
75Hz
832x624
75Hz
1024x768
60Hz
1024x768
75Hz
1152x900
75Hz
1152x900
65Hz
1280x1024
60Hz
1280x1024
75Hz
Sync
Polarity Frequency
Dot
Clock Total Period
(E)
Video Active Time
(A)
Sync Duration
(D)
Back Porch
(F)
Front Porch
(C)
Resolution

- 6 -
FRONT VIEW
Front Control Panel
REAR VIEW
OPERATING INSTRUCTIONS
MENU
SOURCE
AUTO/SELECT
L1811B
Front Control Panel
Power Connect
USB Port
213 46 5
1. Power ON/OFF Button
Use this button to turn the monitor on or off.
2. Power Indicator
This indicator lights up green when the monitor
operates normally. If the display is in DPM(Energy
Saving)mode, this indicator color change to amber.
3. MENU Button
Use these buttons to enter or exit the On Screen Display.
4. ▼▲◀▶ Button
Use these buttons to choose or adjust items in the On Screen
Display. Bring up Contrast and Brightness
adjustment.
5. AUTO/SELECT Button
Use this button to enter a selection in the On Screen Display.
* AUTO adjustment function
When adjusting your display settings,
always press the AUTO/SELECT
button before entering the On Screen
Display(OSD). This will automatically
adjust your display image to the ideal settings for the current
screen resolution size (display mode).
The best display mode is 1280x1024/60Hz.
6. SOURCE Button
Use this button to make Dsub or DVI connector active.
This feature is used when two computers are connected to the
monitor. The default setting is Dsub.
DVI Connect D-Sub Signal
Connect
100
100
PROCESSING
AUTO CONFIGURATION

- 7 -
Making use of USB (Universal Serial Bus)*
USB (Universal Serial Bus) is an innovation in connecting your different desktop peripherals conveniently to your computer.
By using the USB, you will be able to connect your mouse, keyboard, and other to your monitor instead of having to
connect them to your computer. This will give you greater flexibility in setting up your system. USB allows you to connect
chain up to 120 devices on a single USB port, and you can “hot”plug (attach them while the computer is running) or unplug
them while maintaining Plug and Plug auto detection and configuration. This monitor has an integrated BUS-powered USB
hub, allowing up to 2 other USB devices to be attached it.
USB connection
1. Connect the upstream port of the Display to the downstream port of the USB compliant PC or another hub using the
USB cable. (Computer must have a USB port)
2. Connect the USB compliant peripherals to the downstream ports of the monitor.
NOTE
To activate the USB hub function, the monitor must be connected to a USB compliant PC(OS) or another hub with the USB
cable(enclosed).
When connecting the USB cable, check that the shape of the connector at the cable side matches the shape at the connecting
side.
Even if the monitor is in a power saving mode, USB compliant devices will function when they are connected the USB ports(both
the upstream and downstream) of the monitor.
USB downstream Port
connect the cables from USB
compliant peripherals-such as
keyboard, mouse, etc
This is a simplified representation
of rear view.
To USB downstream port
of the USB compliant PC or
another hub cable

MODULE
MATAL FRAME
J702
J703
J706 P902
J710
CN1A
CN2
CN3
CN4
CN7
CN6
CN5
CN1
- 8 -
WIRING DIAGRAM
Connector Ass’y P/N: 6631T11012P
Connector Ass’y P/N: 6631T25008Q
Connector Ass’y P/N:
6631T12002L
Connector Ass’y P/N:
6631T12002M
Connector Ass’y P/N:
6631T20015R

- 9 -
D-SUB DVI-I
Gm5120
including
(MCU/ADC / TMDS Rx )
LVDS
(LVDS823)
Flash Memory
H-Sync A
V-Sync A
H-Sync DA V-Sync DA
Out - CLK
DE ,H/V Sync out
R,G,B Even
LCD Module
R,G,B
differential LVDS:Low Voltage Differential Signaling
Data 8 Bit or 16 Bit
Add ress
R,G,B even, odd
Power
Digital Signal
5V
3.3V
Reg.
DVDD 3.3VAVDD 3.3V
ADC CLK
U/S
D/S
USB
HUB
12V
AC Input
AVDD 2.5V 2.5V
Reg.
DVDD2.5V
AVDD2.5V
3.3V
Reg.
PVDD 3.3V
5V 5V
D/S
Bus-power USB
Input
Selector
(BA7657)
R,G,B, H/V Sync
Inverte r Output Inverter
12V
BLOCK DIAGRAM

- 10 -
DESCRIPTION OF BLOCK DIAGRAM
1. Input signal switching part.
There are two inputs which are analog and digital input.
They come from each 15 pin D-Sub and 24 pin DVI-D connector.
2. Video Controller Part.
This part amplifies the level of video signal for the digital conversion and
converts from the analog video signal to the digital video signal using a pixelclock.
The pixel clock for each mode is generated by the PLL.
The range of the pixel clock is from 25MHz to 135MHz.
This part consists of the Scaler, Flash-ROM IC which stores program data,Reset IC.
The Scaler gets the video signal converted analog to digital, interpolates input to 1280 X 1024 resolution signal and
outputs R, G, B signal to transmitter.
The controlled data of each modes and user setting is stored in EEPROM
Especially Micom/pre-amp / ADC / Video controller are merged to one chip ‘Gm5120’by Genesis.
3. Display Data Transmitter Part.
This part transmit digital signal from the Scaler to the receiver of module.
4. Power Part.
This part consists of the one 5V, two 3.3V and one 2.5 regulators to convert power which is provided 12V, 5V in
LIPS Board.
5V is provided for LCD Panel.
Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.

- 11 -
EMI
COMPONENTS
LINE
100 ~ 240V
INPUT RECTIFIER
AND FILTER ENERGY TRANSFER OUTPUT RECTIFIER AND FILTER
12V
5V
GND
SIGNAL
COLLENT-
ION
PHOTO-COUPLER
ISOLATION
PWM CONTROL
CIRCUIT
HVDC 100KHz
PRIMARY SECONDARY
50 ~ 60Hz
Operation description_Power
1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, the
circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to
adjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and also
the over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the dc output changing status through a photo transistor to primary controller to
achieve the stabilized dc output voltage.
6. Signal collection.
This part function is to collect the any change from the dc output and feed back to the primary through photo
transistor

- 12 -
ADJUSTMENT
All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several minor adjustment may be required.
Adjustment should be following procedure and after
warming up for a minimum of 10 minutes.
•Alignment appliances and tools.
- IBM compatible PC
- Programmable Signal Generator.
(eg. VG-819 made by Astrodesign Co.)
- E(E)PROM with each mode data saved.
1. Adjustment Start
1) Display any pattern at any Mode.
2) Run alignment program for LB800K on the IBM
compatible PC.
3) Select INIT →Initialize command and Enter
4) This will make all data to default state
5) Select COLOR →PRESET START command
and Enter
2. Adjustment for Factory Preset Mode
1) Select DIST. ADJ →FOS DEFAULT command
and Enter
2) It will copy all factory default data to EEPROM
automatically.
3. Adjustment for White Balance
1) Display color 0,0 pattern at Mode 15.
2) Select COLOR → BIAS CALIBRATION command
and Enter.
3) No attempt to manually adjust, BIAS data is auto-
matically adjusted and saved to the EEPROM.
4) Display color 15,0 pattern at Mode 15.
5) Select GAIN CALIBRATION command and Enter.
6) 6500K and 9300K are automatically adjusted and
saved to the EEPROM.
7) Select COLOR → PRESET END command and
Enter.
4. Adjustment for EDID
1) Use this procedure only when there is some
probelm on EDID data.
2) Connect the D-sub cable.
3) Select EDID →Write EDID[A0] command and
Enter.
4) Select DDC(A) Write command and Enter.
5) Connect the DVI-I cable.
6) Select DDC(D) Write command and Enter.
220
IBM
Compatible PC
Video Signal
Generator
PARALLEL PORT
Power inlet (required)
Power LED
ST Switch
Power Select Switch
(110V/220V)
Control Line
Not used
RS232C
PARALLEL
V-SYNC POWER
ST
VGS MONITOR
E
E
V-Sync On/Off Switch
(Switch must be ON.)
F
F
A
A
B
B
C
C
1510
5
569
1
1
1
14
13
25
6
5V
5V
5V
4.7K
4.7K
4.7K
74LS06
74LS06
OFF ON
OFF
ON
11
Figure 1. Cable Connection

- 13 -
TROUBLESHOOTING GUIDE
1. NO POWER
TROUBLE IN
POWER
CHECK J703
5VST VOLTAGE
(5V) ?
NO
NO POWER
(POWER INDICATOR OFF)
TROUBLE
SOMEWHERE ELSE
TROUBLE IN
POWER
CHECK J703
INPUT VOLTAGE
(12V) ?
NO
TROUBLE IN
U203 or X201
NO
YES
YES
YES
CHECK
U203’s PIN 151.
IS THIS PIN
OSCILLATED?

- 14 -
2. NO RASTER
TROUBLE IN
POWER
CHECK
J705 PIN 28, 29, 30
(5V) ?
NO
NO RASTER
TROUBLE IN
POWER
CHECK
J703 PIN 1, 2
(12V) ?
NO
TROUBLE IN
U801
CHECK
U801
(3.3V)?
NO
TROUBLE IN
U201
CHECK
U201 ? NO
TROUBLE IN
U203
NO
YES
YES
YES
YES
CHECK
R234, R235, R237
PULSE?

- 15 -
CHECK DOT CLOCK
PATTERN
NO
CHECK
DVS PATTERN
NO
CHECK
DHS PATTERN
NO
YES
YES
YES
YES
TROUBLE IN
LCD MODULE
CHECK
U401 PIN 8
V.PULSE?
CHECK
U401 PIN 7
H.PULSE?
CHECK
U401 PIN 10
PULSE ?

- 16 -
3. NO CLOCK (CLOCK GENERATOR)
NO DOT CLOCK
TROUBLE IN
X201
CHECK
X201 20MHz ? NO
TROUBLE IN
U203
CHECK
R237
CLOCK ?
NO
YES
YES

- 17 -
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN PC
CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
NO
TROUBLE IN
X201
NO
TROUBLE IN
SIGNAL CABLE
NO
YES
YES
YES
CHECK
U203 PIN 152
WAVEFORM
(20MHz) ?
CHECK
R711, R712?
CHECK
U203 PIN 44
?

PRINTED CIRCUIT BOARD
- 18 -
1. MAIN BOARD (Component Side)
/
30
C734 C731C732C733 C729C730
C801
R202
R249
5
Q701
R741 R740
B
R129 R122
J710
D704
J706
C413
R407
C401
R402 R401
20
R403
R405 R404
R745
10
1
B
R747 R742R748
U803
R744R743
C802
R267
R285
R284
R265
R266
R286
10
R248
R776
R777
R782
25
Q702
Q103
R778
R779
R783
Q102
C106C107
R131
R130
D703
D702
C114
30
100 90
R210 R208 R214 R272 R276
A
R802
R706
R287
R288
15
R277
20
R251
R201
R253
U201
Q202
R160
U107
U207
R132
R133
C118
D701
ZD706
C116
5040
80
R211 R209 R207 R215 R216 R217 R250
C807
C806 R206
R275
Q201
R205
A
R264
C232
R252
R752
ZD710
R161R170
R753
Q104
R172
R171 U106
U108
ZD707
C112
J704
C817
C819
L823
60
70
U401
1
C207
U205
50
40
3020
R242 R243
10
R244 R292
1
Q108
R246
R247
R240
R241
C178
U702
D712
ZD711
R767
ZD704
ZD703
R408
R406
RA210
RA209 RA211
60
200
C211
C280 R227 R228
R278
R290
R291
ZD708
ZD709
R766
R765
C110
D714D716
C845
J703
R409
C860
C408
RA206 RA208
RA207
8070
U203
190180
C210
C204
C281
C282
R225
R226
R224
R223
C108 R718
D739 D738
R825 R807 L830
R809
U802
R813
R814
C410
MODEL:LB800K
U801
P/N :6870T570A10
RA204
DATE :2002.10.05
RA203 RA205
90
170
C125
R770 R771
R772 R773
R774 R775
D735
D737
R719
D734 D736
L811
C840
R810
C818 R811
R812
R819
R815
R816
R817
R818
R820
R801
RA200 RA202
RA201
100
120110 140
130 150
C202 R268
160
L101C128
U701
C702
C130
R151
D733
D732
ZD701
C706
C808 C811
C809
R800
R219 R220 R289
C810
R221 R229
R230
R231
R232
R233
C201
U110
U109
C161
C177
R153
ZD702
J708
ZD705
J702
C813 C812
C285
R280
R281 R297
R298 R299
X201 C160

- 19 -
2. MAIN BOARD (Solder Side)
R259
R258
R257
C203
R256
R255
R254
C115
R703
R704
R705
C402
C404
C117
R713
R714
C403
C406
R274
C205
R145
C119
R716 R715
C714 C703
D710
C715
C407
C405
R273
R204
R203
R218
C206
C245
C214
C247
C246
C244
R142
C120
C111
C113
D709
R711
R712
R733 R734
C215
C227
R239
C234
C235
R140
R135
R768
R761
D723
R729
C209
R234
C219
C218
C217
C229
C228
C236
C237
C238
C124
R760
R150
C109
R769
D724
C213
C212
R237
R235
R236
R282
C283
C284
C230
C239
C240
C241
C727
D722
D721
C216
C221
R283
C220
C222
C226 C223
C225 C224
C233
C242
R727
R726
R732
C728
D720
D718
D719
D717
C231
R702
D711

- 20 -
3. POWER B OARD (Component Side)
4. POWER B OARD (Solder Side)