L1811S COLOR MONITOR SERVICE MANUAL Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. CHASSIS NO. : CL-43 MODEL: L1811S (L1811SL-AL**R) ( ) **Same model for Service *To apply the Mstar Chip.
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ADJUSTMENT ...................................................... 10TROUBLESHOOTING GUIDE .............................. 11PRINTED CIRCUIT BOARD................................... 14EXPLODED VIEW...................................................17REPLACEMENT PARTS LIST ...............................19PIN CONFIGURATION ...........................................22SCHEMATIC DIAGRAM......................................... 24
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPMS OFF
POWER S/W OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
-
POWER CONSUMPTION
less than 53 W
less than 2 W
less than 2 W
less than 2 W
LED COLOR
GREEN
AMBER
AMBER
AMBER
OFF
VIDEO
ACTIVE
OFF
OFF
OFF
- less than 1 W(@120V AC)
- 3 -
WARNING FOR THE SAFETY-RELATED COMPONENT.
• There are some special components used in LCDmonitor that are important for safety. These parts aremarked on the schematic diagram and thereplacement parts list. It is essential that these criticalparts should be replaced with the manufacturer’sspecified parts to prevent electric shock, fire or otherhazard.
• Do not modify original design without obtaining writtenpermission from manufacturer or you will void theoriginal parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULEWITH BACKLIGHT UNIT.
• Must mount the module using mounting holes arrangedin four corners.
• Do not press on the panel, edge of the frame stronglyor electric shock as this will result in damage to thescreen.
• Do not scratch or press on the panel with any sharpobjects, such as pencil or pen as this may result indamage to the panel.
• Protect the module from the ESD as it may damage theelectronic circuit (C-MOS).
• Make certain that treatment person’s body aregrounded through wrist band.
• Do not leave the module in high temperature and inareas 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 withinthe module.
• If the surface of panel become dirty, please wipe it offwith a softmaterial. (Cleaning with a dirty or rough clothmay damage the panel.)
WARNING
BE CAREFUL ELECTRIC SHOCK !
• If you want to replace with the new backlight (CCFL) orinverter circuit, must disconnect the AC adapterbecause high voltage appears at inverter circuit about650Vrms.
• Handle with care wires or connectors of the invertercircuit. If the wires are pressed cause short and mayburn or take fire.
PRECAUTION
CAUTIONPlease use only a plastic screwdriver to protect yourselffrom shock hazard during service operation.
TIMING CHART
- 4 -
VIDEO
SYNC
B
D
CF
E
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 – 70.8Hz 449 350 37 2 60
H – 31.469 840 640 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 + 37.879 1056 800 40 128 88
V + 60.317 628 600 1 4 23
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/VSort
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
640x35070Hz
640x48060Hz
640x48075Hz
720x40070Hz
800x60060Hz
800x60075Hz
832x62475Hz
1024x76860Hz
1024x76875Hz
1152x87075Hz
1152x90065Hz
1280x102460Hz
1280x102475Hz
Sync Polarity Frequency
DotClock
Total Period(E)
Video Active Time(A)
Sync Duration(D)
Back Porch(F)
Front Porch(C)
Resolution
- 5 -
FRONT VIEW
Front Control Panel
REAR VIEW
OPERATING INSTRUCTIONS
L1811S
See Front Control Panel
Power Connect
213 46 5
1. Power ON/OFF ButtonUse this button to turn the monitor on or off.
2. Power IndicatorThis 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 ButtonUse these button to enter or exit the On Screen Display.
4. ButtonUse these buttons to choose or adjust items in the OnScreen Display.
5. AUTO/SELECT Button Use this button to enter a selection in the On Screen Display.
6. LIGHTVIEW ButtonUse this button to enter a selection in the on screendisplay.
D-Sub SignalConnect
100
100
Bring up Contrast and Brightnessadjustment.
When adjusting your display settings,always press the AUTO/SELECT buttonbefore entering the On ScreenDisplay(OSD). This will automatically
adjust your display image to the ideal settings for the currentscreen resolution size (display mode).
The best display mode is 1280x1024/60Hz.
This function optimizes the brightness, contrast or colorvalue to the surrounding conditions and settings andenables you to enjoy the most suitable picture byadjusting the surroundings (DAY/NIGHT/USER MODE).
• TEXT: For viewing letters • MOVIE: For viewing movies• PHOTO: For viewing pictures or the photographs• USER MODE: This function memorizes the
manual adjustment -Brightness, Contrast andColor value on the On Screen Display.
This function allows you to secure the current control settings, so that they cannot be inadvertentlychanged. Press and hold the MENU button and button for 3 seconds: the message “CONTROLSLOCKED” appears.
You can unlock the OSD controls at any time by pushing the MENU button and button for 3 seconds:the message “CONTROLS UNLOCKED” will appear.
CONTROLS LOCKED/UNLOCKED
: MENU and
OPERATING INSTRUCTIONS
- 7 -
D-S
UB
MS
T91
11in
clu
din
g(A
DC
/LV
DS
/SC
AL
ER
)
MT
V31
2M
ico
m
LC
D M
od
ule
R,G
,B
dif
fere
nti
al
LVD
S(L
ow
Vo
ltag
e
Dif
fere
nti
al S
ign
alin
g)
5V
3.3V
Reg
.2.
5VR
eg.
5V5V
12V
R,G
,B, H
/V S
yn
cP
ow
er
5V
AC
Inp
ut
Inve
rter
Ou
tpu
t
Inve
rter
12V
3.3
V2.
5V
3.3
V
2.5
V
BLOCK DIAGRAM
- 8 -
DESCRIPTION OF BLOCK DIAGRAM
1. Video Controller Part & Display Data Transmitter Part.(MST9111)
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 pixel clock.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.The Scaler gets the video signal converted analog to digital, interpolates input to 1280 x 1024 resolution signal and outputs 8-bit R, G, B signal to transmitter.Especially pre-amp / ADC / Video controller/ Transmitter are merged to one chip “MST9111” by MSTAR.This part transmit digital signal from the Scaler to the receiver of module.
2. Micom Part
This Part consists of EEPROM IC which stores control data, Reset IC and the Micom. The Micom distinguishes polarity and frequency of the H/V Sync are supplied from signal cable.The controlled data of each modes is stored in EEPROM.
3. Power Part
This part consists of the one 3.3V and one 2.5 regulators to convert power which is provided 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.
4. Inverter
The inverter converts from DC12V to AC 700Vrms and operates back-light lamps of module.
- 9 -
Power Board Block Diagram
EMICOMPONENTS
LINE100 ~ 240V
INPUT RECTIFIERAND FILTER
ENERGYTRANSFER
OUTPUT RECTIFIERAND FILTER
12V
5V
GND
SIGNALCOLLECT-
IONPHOTO
INVERTER CIRCUIT High Voltage output12V
-COUPLERISOLATION
PWM CONTROLCIRCUIT
HVDC 100KHz
PRIMARY SECONDARY
50 ~ 60Hz
Operation description_Power1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, thecircuit 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, toadjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and alsothe 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 toachieve 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 phototransistor
- 10 -
ADJUSTMENT
All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several minoradjustment 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 process for LCD MONITOR1) Display half window pattern(or mixed white and black pattern)at Mode 8 (1024x768@60Hz).2) Press the POWER and MENU key at the same time to light monitor, then go to adjustment mode.3) Press the MENU s/w, next press UP button, you will see adjustment OSD menu.4) Press the AUTO/SELECT to select the adjustment item first(use the same button to exit)next do the operation to
the relative item.Ex) 17HYDIS is used at 17AU, press right button to select. Press the AUTO/SELECT then selected proper Module.
5) Press down button to move the place of ADC CAL. Press the AUTO/SELECT to select, right button is pressed for adjustment.
6) When adjustment is finished, press the POWER key twice to light monitor again. The dajustment ends.
2. Adjustment for EDID1) 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.
220
IBMCompatible PCVideo Signal
Generator
PARALLEL PORT
Power inlet (required)
Power LED
ST Switch
Power Select Switch(110V/220V)
Con
trol
Lin
e
Not u
sed
RS232
C
PARAL
LEL
V-SY
NC
POW
ER
ST
VGS
MONITOR
E
E
V-Sync On/Off Switch(Switch must be ON.)
F
F
A
A
BB
C
C
15105
5
69
1
1
1
14
13
25
6
5V
5V
5V
4.7K4.7K
4.7K
74LS06
74LS06
OFF ON
OFF
ON
11
Figure 1. Cable Connection
- 11 -
TROUBLESHOOTING GUIDE
1. NO POWER
CHECK U803.
CHECK U803 PIN 3VOLTAGE
(5V) ?
NO
NO POWER(POWER INDICATOR OFF)
CHECK POWERBOARD, AND FIND
OUT A SHORT POINT AS OPENING
EACH POWER LINE
CHECK J709VOLTAGE
PIN5, PIN6 (5V)?
NO
CHECK 5VS LINE(OPEN CHECK)
CHECK U804 PIN 3 Voltage
(5V) ?
NO
CHECK IIC LINECONNECTION(U501, U502)
CHECK U201 VCC,XTAL, RESET
IS U201 PIN114 (3.3V)
VOLTAGE REPEATED AS PULSE SHAPE ?
NO
YES
YES
YESNO PROBLEM
YES
CHECK KEY CONTROLCONNECTOR ROUTINE
- 12 -
2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS
CHECK MICOM INVON/OFF PORT.
J707 PIN812V?
NO
NO RASTER(OSD IS NOT DISPLAYED)
CHECK LIPS
J709 PIN5, PIN 6
5V?
NO
1. CONFIRM BRIGHTNESSOSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ PORT
J707 PIN75V?
NO
LIPS
CHECK PULSE AS
CONTACTING SCOPE PROBE TO CAUTION LABEL.
(CONTACT PROBE TO CAUTION LABEL.
CAN YOU SEE PULSE AT YOUR SCOPE?
NO
REPLACE CCFL LAMPIN THE LCD MODULE
YES
YES
YES
YES
- 13 -
1. CHECK PIN122, 123 SOLDERING CONDITION
2. CHECK X5013. TROUBLE IN U201
U201 POWER PINS
3.3V?
NOCHECK U804
U201 PIN122, 123
OSCILLATE AS12MHZ?
CHECK CONNECTION LINE FROM U201 TO U501
TROUBLE IN CABLE OR LCD MODULE
YES
YES
YES
3. NO RASTER (OSD IS NOT DISPLAYED) – MST9111
NO RASTER(OSD IS NOT DISPLAYED)
U501PIN41 IS 64KHz H-SYNC?PIN42 IS 60Hz V-SYNC?IS PULSE APPEARED
AT SIGNAL PINS?
NO
NO
- 14 -
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN PC
CHECK PC PC IS NOT GOINGINTO DPM OFF MODE
NO
TROUBLE INX501
NO
TROUBLE INSIGNAL CABLE
NO
YES
YES
YES
CHECKU501 PIN 11,12
WAVEFORM (12MHz) ?
CHECK R734, R741(SYNC) ?
CHECKU501 PIN 24
(0V) ?
PRINTED CIRCUIT BOARD
- 15 -
1. MAIN BOARD (Component Side)
R711
R710
J708
R533
R534
R537
C516
J706
1
C
R552
Q507
R55
5
R55
3
Q508
C50
8
R55
6
R55
4
R766
C50
9 C
Q704
R709
R708R528
R580
R570
R747
R748
R560
C711
C710
C709
R529
R581
R571
R562
C708
1
J702
U50
2
R53
2
C550
R550C514
R53
1
R53
0
R539
R559 R513
R55
7
R76
3D
719
R76
5R
764
U70
3
R762
C50
1
Q50
3
R53
5
R542
Q502
5 40
C530
R745
R744
Q703
C507
R561
R558
Q509
U503
R727
R726
R724
R723
C712
U70
2
X50
1
C51
3C
512
R53
6 10
15
C503
U50
1
35
ZD703
D70
7
C703 R725
R72
2
J703
P/N
:68
70T
630A
11
DAT
E :2
003.
02.2
4 R51
0Q
506
MO
DE
L:L1
811S
L/L1
810B
L
C50
2
R504
R502
R501 20
25
30
C730
R520
R705
R741
R716 ZD711
ZD
704
ZD
701
R511
1
R525
R515
R509
Q504
C223
R59
6
R59
5 R59
0
R59
2
R59
1
R52
2
R54
0
R59
3
R53
8
C50
6
C50
5
C208
R219
R218
R52
3
R52
4 C731
R74
0
R73
3
R734
Q70
2R707
R717
C707
ZD
702
C822
C82
0
C231
C240
C232
C206
C205
C204
R55
1
A
70
C22
0
R54
1
R240
R209
R208
R203
R202
R201
Q50560
C218
C22
4
4050
C215
C210
C209
C207
C74
4C
743
Q701
D70
2
R70
3R
701
U80
2
C821
R81
2
C80
3
C80
4
C244
C245
C248
C249
C246
C250
C247
C233
80
C227
C22
2
R212
R217
R216
R213
R211
R215
R214
R210
20
30
C216
C74
2C
741
R75
8
D71
8D
706
D70
1
R70
6
C74
0
R811
90
10
0
C221
C217
10
R207
A
C73
5C
734
C714 ZD
706
R75
9R
761
D71
7
D716
J709 1
J705
C819
C818
R753
110
C219
C226
C230 C214
C22
8
C229
C225
U20
11
R205
R204
R72
9
C713
ZD709
R730
R76
7
Q70
6
ZD
705
R731
1
C72
7Q
705
R75
1
C81
7
X20
1
C83
1
C716
R72
8
C73
9
R76
8
Q70
7
D71
5B
C81
0
R813
R73
5
C80
9
R75
0
C83
2C76
0
R803 C801
C715
C73
8C
737
R771
R770
R769
D71
4
D71
1D
709
D70
8
C73
2
R849 R845
R844
R843R840
R841
R81
4 U805 C802
C829
C828
C7
33
R774
R773
R772
J701
D71
3
D71
2D
710
B
R848
R847 R846
R842
J707
1
U804 U803
C705
C704
R754
R732
R755 C706
ZD707
ZD708
R757
R756
- 16 -
2. POWER BOARD (Component Side)
3. POWER BOARD (Solder Side)
4. CONTROL BOARD
SW8
POWER
AG
LED1
SW7
SET/AUTO
R3
RIGHT
SW5 SW6
R5
LEFT
R4
R7
R6
R8
SW4
UP
SW3
DOWNMENU
SW2SW1
INPUT
C2
C1
R1
R2
J1
- 17 -
1
13
11
10
6
5
4
c
12
a
a
b
3
9
8
2
7
EXPLODED VIEW
- 18 -
EXPLODED VIEW PARTS LIST
Ref. No.
1
2
3
4
5
6
7
8
9
10
11
12
13
a
b
c
Part No.
3091TKL044P
6304FLP034A
or 6304FLP044A
3809TKL025L
3043TKK091E
6871TST389A
6631T11012P
6633TZA008C
4951TKS078X
6871TMT414A
6871TPT225A
4814TKK187A
4950TKK429A
6850TD9004D
or 6850TD9004A
1SZZTER001H
332-113S
332-105G
Description
CABINET ASSEMBLY, L1811SL BRAND , ANALOG ONLY
LCD(LIQUID CRYSTAL DISPLAY), LM181E06-A4M1 LG PHILPS TFT COLOR SXGA 18.1" LVDS SMM
LCD(LIQUID CRYSTAL DISPLAY), LM181E06-A4C3 LG PHILPS TFT COLOR SXGA LVDS SMM
BACK COVER ASSEMBLY, LB801G , L1811SG (ANALOG ONLY)
TILT SWIVEL ASSEMBLYLM805L -HIPS NO USB
PWB(PCB) ASSEMBLY,SUB, L1811SL L1810BL CONTROL TOTAL BRAND CONTROL
CONNECTOR ASSEMBLY, 30P H-H 100MM UL20276 PANEL LINK LB886F