LG Flatron L1910B User manual

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-62
MODEL: L1910B (L1910BM-AF**R)
( ) **Same model for Service
*To apply the Mstar Chip.
L1810B

- 1 -

1. LCD CHARACTERISTICS
Type : TFT Color LCD Module
Size : 19inch(48cm)diagonal
Pixel Pitch : 0.294(H) x 0.294(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 : 4-CCFL (Cold Cathode
Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥ 10
(LPL Module)
Left : -85° min., -88°(Typ) Right : +85° min., +88°(Typ)
Top :+85° min., +88°(Typ) Bottom : -85°min., -88°(Typ)
(AU Module)
Left : -75° min., -85°(Typ) Right : +75° min., +85°(Typ)
Top :+75° min., +85°(Typ) Bottom : -75°min., -85°(Typ)
(CMO Module)
Left : -85°(Typ) Right : +85°(Typ)
Top : +85°(Typ) Bottom : -85°(Typ)
2-2. Luminance : 190(min), 250(Typ)
-LPL Module
200(min), 250(Typ) -AUO Module
200(min), 250(Typ) -CMO Module
2-3. Contrast Ratio : 250(min), 400(Typ)
-LPL Module
400(min), 600(Typ) - AUO Module
250(min), 400(Typ)
- CMO Module
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 : 0~0.7 V
a) Color 0, 0 : 0 Vp-p
b) Color 7, 0 : 0.35 Vp-p
c) Color 15, 0 : 0.7 Vp-p
3) Input Impedance : 75 Ω
3-3. Operating Frequency
Horizontal(Analog) : 30 ~ 83kHz
Horizontal(Digital) : 30 ~ 71kHz
Vertical : 56 ~ 75Hz
4. MAX. RESOLUTION
D-sub Analog : 1280 x 1024
DVI Digital/Analog : 1280 x 1024
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
Lamp Life : 30,000 Hours(Typ)
7. DIMENSIONS (with TILT/SWIVEL)
Width : 413 mm (16.25'')
Depth : 223 mm (8.78'')
Height : 435mm (17.13'')
8. WEIGHT (with TILT/SWIVEL)
Net. Weight : 7.6kg (16.75 lbs)
Gross Weight : 10.1kg (22.27 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
EXPLODED VIEW...................................................18
REPLACEMENT PARTS LIST ...............................20
SCHEMATIC DIAGRAM......................................... 24
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPM OFF
POWER S/W OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
-
POWER CONSUMPTION
less than 45 W
less than 1 W
less than 1 W
less than 1 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-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
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

- 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
L1810B
Front Control Panel Power Connect USB Port
2
LightView
14 36 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.
Button
Use these buttons to choose or adjust items in the On Screen
Display.
4. MENU Button
Use this button to enter or exit the On Screen Display.
5. AUTO/SELECT Button
Use this button to enter a selection in the On Screen Display.
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
This function optimizes the brightness, contrast or
color value to the surrounding conditions and settings
and enables you to enjoy the most suitable picture by
adjusting 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 and
Color value on the On Screen Display.
100
100
Bring up Contrast and Brightness adjustment.
:

- 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 Play 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
This function allows you to secure the current control settings, so that they cannot be inadvertently
changed. Press and hold the MENU button and button for 3 seconds: the message “CONTROLS
LOCKED”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

J702
J706
J705
CN002
CN103CN102
CN104CN105
- 8 -
WIRING DIAGRAM
Connector Ass’y P/N: 6631T20023A
Connector Ass’y P/N:
6631T11012W
Connector Ass’y P/N:
6631T20022E

- 9 -
D-SUB
MST9131B
including
(ADC/LVDS/SCALER
/INPUT SWITCHING
/TMDS )
MTV312
Micom
LCD Mod le
R,G,B differential
LL
LLVV
VVDD
DDSS
SS
((
((
LL
LLoo
ooww
ww
VV
VV oo
ooll
ll
tt
tt
aa
aagg
ggee
ee
DD
DDii
ii
ff
ffff
ffee
eerr
rree
eenn
nntt
tt
ii
ii
aa
aall
ll
SS
SSii
ii
gg
ggnn
nnaa
aall
ll
ii
ii
nn
nngg
gg))
))
LIPS
5V
12V : LP L 5V : other
AC Inp t
3.3V
Reg.
Diode
KDS184
5V 3.3V
12V
DVI-D
R,G,B, H/V Sync Digital Signal
U/S D/S
USB
HUB
D/S
3.3V 2.5V
3.3V 2.5V
BLOCK DIAGRAM

- 10 -
DESCRIPTION OF BLOCK DIAGRAM
1. 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 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, ADC and TMDS receiver .
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.
2. Power Part.
This part consists of the one 3.3V regulator, and two 2.5V drop diodes to convert power which is provided 12V,
5V in Power board.
5V is provided for LCD panel and Micom. In case of LPL panel, 12V is provided for LCD panel.
Also, 5V is converted 3.3V by regulator and 3.3V is converted 2.5V by drop diode.
Converted power is provided for IC in the main board.
3. 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.

- 11 -
EMI
COMPONENTS
LINE
100 ~ 240V
INPUT RECTIFIER
AND FILTER ENERGY TRANSFER OUTPUT RECTIFIER AND FILTER
12V
5V
GND
SIGNAL
COLLECT-
ON
PHOTO-COUPLER
ISOLATION
PWM CONTROL
CIRCUIT
HVDC 100KHz
PRIMARY SECONDARY
50 ~ 60Hz
Operation description_LIPS
LIPS Board Block Diagram
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 for 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 achieve the dc output stabilized,
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
Windows EDID V1.0 User Manual
Operating System: MS Windows 98, 2000, XP
Port Setup: Windows 98 => Don’t need setup
Windows 2000, XP => Need to Port Setup.
This program is available to LCD Monitor only.
1. Port Setup
a) Copy “UserPort.sys”file to
“c:\WINNT\system32\drivers”folder
b) Run Userport.exe
c) Remove all default number
d) Add 300-3FF
e) Click Start button.
f) Click Exit button.
2. EDID Read & Write
1) Run WinEDID.exe
2) Edit Week of Manufacture, Year of Manufacture,
Serial Number
a) Input User Info Data
b) Click “Update”button
c) Click “Write”button

- 13 -
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
SERVICE OSD
1) Turn off the power switch at the front side of the display.
2) Wait for about 3 seconds and press MENU, POWER switch with 1 second interval.
3) The SVC OSD menu contains additional menus that the User OSD menu as described below.
a) MODULE : To select applied module.
b) NVRAM INIT : EEPROM initialize(24C08)
c) ADC OFFSET : The lowest value of input leves sets to digitally 0(zero).
d) ADC GAIN : The highest value of input levels sets to digitally 255.
e) ADC CAL : W/B balance sets the gain and offset value.
f) ELAPSED CLEAR : To initialize using time.

- 14 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK J705
VOLTAGE
PIN5, PIN6 (5V)?
NO
CHECK 5VS LINE
(OPEN CHECK)
CHECK
U501 PIN 8 Voltage
(5V) ?
NO
NO
NO
CHECK U201 PIN 122
PULSE
CHECK U201
CHECK 3.3V LINE
CHECK X-TAL
IS U201
PIN114 (3.3V)
VOLTAGE ?
YES
YES NO PROBLEM
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
YES

- 15 -
2. NO RASTER (OSD IS NOT DISPLAYED) –LIPS
CHECK MICOM INV
ON/OFF PORT.
J705 PIN 9
5V? NO
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK LIPS
J705
PIN5, PIN6
5V?
NO
1. CONFIRM BRIGHTNESS
OSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ
PORT
J705 PIN10
5V? 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 LAMP
IN THE LCD MODULE
YES
YES
YES
YES

- 16 -
3. NO RASTER (OSD IS NOT DISPLAYED) –MST9131B
1. CHECK PIN122, 123
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN U201
U201
POWER PIN 8, 114
(3.3V)?
NO CHECK U801
U201
PIN122, 123
OSCILLATE AS
12MHZ?
CHECK CONNECTION LINE
FROM D-SUB TO U501
TROUBLE IN CABLE
OR LCD MODULE
YES
YES
YES
NO RASTER
(OSD IS NOT DISPLAYED)
U501
PIN43 IS 64KHz H-SYNC?
PIN44 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
NO
NO

- 17 -
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN U501
CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
NO
CHECK H/V SYNC
LINE
NO
YES
YES
CHECK
R756, R760
(SYNC) ?
CHECK
U501 PIN 43.44
SYNC PULSE?

- 18 -
15
6
7
10
11
12 13
14
8
9
2
3
4
EXPLODED VIEW

- 19 -
EXPLODED VIEW PARTS LIST
1
2
3
4
5
6
7
8
9
10
11
12
13
14
3091TKL072P CABINET ASSEMBLY, L1910B BRAND L067 HF350U SILVER(TCO03)
3091TKL096H CABINET ASSEMBLY, L1910B BRAND TKL067 ABS AF-350U TCO03 AUSTRIA
3091TKL096M CABINET ASSEMBLY, L1910B BRAND TKL067 PC+ABS TCO03, USA/CANADA
3091TKL096S CABINET ASSEMBLY, L1910BM BRAND TKL067 BK VERSION PC+ABS TCO99 , USA/CANADA
6304FLP075A LCD(LIQUID CRYSTAL DISPLAY) , LM190E01-C4 LG PHILPS TFT COLOR 4LAMP 250NIT
3809TKL051A BACK COVER ASSEMBLY, L191OB,P L053 BRAND HF350U(87074)
3809TKL051K BACK COVER ASSEMBLY, L1910B TKL053 PC+ABSTCO03, USA/CANADA
3809TKL051Q BACK COVER ASSEMBLY, L1910BM TKL053 BK VERSION PC+ABSTCO99 , USA/CANADA
3043TKK091Q TILT SWIVEL ASSEMBLY, L1810BL/L1710BL , USB
3043TKK091V
TILT SWIVEL ASSEMBLY, L1910B(PLANAR) K254 60HR 9930(EK00)BLACK TCO99 , USA/CANADA
6871TST415A PWB(PCB) ASSEMBLY,SUB, L1910 L1810 CONTROL TOTAL BRAND CONTROL
4951TKS126G METAL ASSEMBLY, FRAME L1910B/PM LPL/CMO/FUSITSU(226G)
6871TPT271E
PWB(PCB) ASSEMBLY,POWER, 19" M-CHASSIS POWER TOTAL LIEN CHANG " INTEGRATED LIPS" USED 7812
6871TPT271V PWB(PCB) ASSEMBLY,POWER, M-CHASSIS 19LPL DOCKING,2PIN,78R12,450V POWER TOTAL LIEN CHANGTCO99 , USA/CANADA
3313TL9025A MAIN TOTAL ASSEMBLY, L1910BM LPL - E BRAND CL-62
3313TL9025B MAIN TOTAL ASSEMBLY, L1910BM LPL - K BRAND CL-62 JAPAN
6871TKT294A PWB(PCB) ASSEMBLY,INTERFACE, L1910BM ETC TOTAL BRAND AC INLET ASSY
6631T11012W CONNECTOR ASSEMBLY, 30P H-H 200MM UL20276 LG708G
4951TKS118D METAL ASSEMBLY, REAR SHIELD L1910B,P,S
6850TD9004J CABLE,D-SUB UL20276-9C(5.8MM), DT 1500MM,CORE POS400MM GRAY(85964) L1720BM DM
or 6850TD9004D CABLE,D-SUB UL20276-9C(5.8MM), DT 1500MM GRAY(85964) LB500L DM
6850TD9004G CABLE,D-SUB UL20276-9C(5.8MM), DT 1800MM BLACK(9930) SONY DMTCO99 , USA/CANADA
6866TDU002D CABLE,D-SUB UL20276SB10P+2C AWG#30 DT 1870MM GRAY(85964) BRAND DM
6866TDU002A CABLE,D-SUB, UL20276 DT 1870MM BLACK LQ800 DM
6866TDV004C CABLE,DVI, UL20276 DT 2000MM GRAY(85964) LB885C DM
6866TDV004K CABLE,DVI, UL20276 DT 2000MM BLACK (9930) LB886F W/SR DMTCO99 , USA/CANADA
Description Part No.Ref. No.