Sharp LL-T2020 User manual

CODE : 00Z
qSERVICE MANUAL
CONTENTS
Parts marked with " ! " are important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
SHARP CORPORATION This document has been published to be used
for after sales service only.
The contents are subject to change withoutnotice.
LLT2020SME
LCD MONITOR
MODEL LL-T2020
CHAPTER 1. OUTLINE OF THE PRODUCT,
NOMENCLATURE AND FUNCTION. . . . . . . . . . . . . . . . . .1 - 1
CHAPTER 2. CONNECTION, ADJUSTMENT,
OPERATION, AND FUNCTIONS. . . . . . . . . . . . . . . . . . . . .2 - 1
CHAPTER 3. DISASSEMBLY AND ASSEMBLY. . . . . . . . . . . . . . . . . . . .3 - 1
CHAPTER 4. TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1
CHAPTER 5. WAVE FORM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1
CHAPTER 6. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1
CHAPTER 7. CIRCUIT DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 - 1
CHAPTER 8. PARTS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1

LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 1
CHAPTER 1. OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1. SPECIFICATIONS
■
■■
■Product specifications
• LCD display
51 cm measured diagonally
Advanced Super-V and Anti Glare Low Reflection
TFT LCD module
• Resolution (max.)
UXGA 1600 x 1200 pixels
• Displayable colors (max.)
Approx. 16.77 million colors (8 bit)
• Brightness (max.)
220cd/m2
• Dot pitch
0.255 (H) x 0.255 (V) mm
• Contrast ratio
350 : 1
• Angle of visibility
Left-right 170° ; Up-down 170° (contrast ratio
u 10)
• Screen display size
Horizontal 408 mm x Vertical 306 mm
• Video signal
Analog: Analog RGB (0.7Vp-p) [75Ω]
Digital: DVI standard based on 1.0
• Sync signal
Separate Sync (TTL level: +/-), Sync on Green, Composite Sync
(TTL level: +/-)
• Expansion compensation
Digital scaling
(Enlargement VGA/SVGA/XGA/SXGA etc. to full screen size.)
• Plug & Play
VESA DDC2B compatible
• Power management
VESA: based on DPMS
DVI: based on DMPM
• Input signal terminal
29 pin DVI-I x 2
• USB hub function
1 upstream port, 2 downstream ports
(selfpowered hub based on USB standard Rev 1.1)
• Height adjustment
Adjustment range: Approx. 60 mm
• Screen rotation
Clockwise 0 - 90°
• Screen tilt
Upward approx. 0 - 30° ; downward approx. 0 - 5°
• Screen swivel
Approx. 90° from left through right
• Power supply
AC100 - 240V, 50/60Hz
• Temperature of operating environment
5 - 35°C
• Power consumption
53W (Not using USB hub)
(60W maximum, 3W when in power-saving mode)
• Dimensions (W x D x H) (Units: mm)
With long width screen: 450 x 228 x 438 - 498
With long height screen: 348 x 228 x 490 - 550
• Weight
Approx. 10 kg
Display area only, approx. 6.5kg
■
■■
■Dimensions (Units: mm)
• Analog signal cable: Approx. 2.0m
• Digital signal cable: Approx. 2.0m
• USB cable: Approx. 2.0m
• Digital signal cable, NL-C04J (purchased separately): Approx. 2.0m
• Analog signal cable, NL-C02E (purchased separately): Approx. 2.0m
• 2-input cable, NL-C03J (purchased separately): Approx. 0.25m
450
228
438 348
498
348
490 450
550
310

LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 2
■
■■
■Relevant signal timings (analog)
• Recommended resolution is 1600 x 1200.
• All are compliant only with non-interlaced.
• Frequencies for Power Macintosh and the Sun Ultra series are refer-
ence values. To connect, another adapter (commercially available)
may be required.
• If the monitor is receiving timing signals that are not compatible, [OUT
OF TIMING] will appear.
Follow your computer's instruction manual to set the timing so that it
is compatible with the monitor.
• If the monitor is not receiving any signal (synch signal), [NO SIGNAL]
will appear.
■
■■
■Relevant signal timings (digital)
• Recommended resolution is 1600 x 1200.
• All are compliant only with non-interlaced.
• A computer with an output terminal conforming to DVI (DVI-D24 pin
or DVI-I29 pin) and with UXGA output capability can be connected
here.
(Depending on the type of computer to be connected, the display may
not work correctly.)
• If the monitor is receiving timing signals that are not compatible, [OUT
OF TIMING] will appear.
Follow your computer's instruction manual to set the timing so that it
is compatible with the monitor.
• If the monitor is not receiving any signal (synch signal), [NO SIGNAL]
will appear.
■
■■
■The DVI-I input connector pin
(DVI-I connector with 29 pins)
Display mode Hsync Vsync Dot frequency
VESA 640 x 480 31.5kHz 60Hz 25.175MHz
37.9kHz 72Hz 31.5MHz
37.5kHz 75Hz 31.5MHz
800 x 600 35.1kHz 56Hz 36.0MHz
37.9kHz 60Hz 40.0MHz
48.1kHz 72Hz 50.0MHz
46.9kHz 75Hz 49.5MHz
1024 x 768 48.4kHz 60Hz 65.0MHz
56.5kHz 70Hz 75.0MHz
60.0kHz 75Hz 78.75MHz
1152 x 864 67.5kHz 75Hz 108.0MHz
1280 x 960 60.0kHz 60Hz 108.0MHz
1280 x 1024 64.0kHz 60Hz 108.0MHz
80.0kHz 75Hz 135.0MHz
1600 x 1200 75.0kHz 60Hz 162.0MHz
US text 720 x 400 31.5kHz 70Hz 28.3MHz
Power
Macintosh
series
640 x 480 35.0kHz 66.7Hz 30.2MHz
832 x 624 49.7kHz 74.6Hz 57.3MHz
1024 x 768 60.2kHz 75Hz 80.0MHz
1152 x 870 68.7kHz 75Hz 100.0MHz
1280 x 1024 64.0kHz 60Hz 108.0MHz
80.0kHz 75Hz 135.0MHz
1600 x 1200 75.0kHz 60Hz 162.0MHz
Sun Ultra
series 1024 x 768 48.3kHz 60Hz 64.13MHz
53.6kHz 66Hz 70.4MHz
56.6kHz 70Hz 74.25MHz
1152 x 900 61.8kHz 66Hz 94.88MHz
71.8kHz 76.2Hz 108.23MHz
1280 x 1024 71.7kHz 67.2Hz 117.01MHz
81.1kHz 76Hz 134.99MHz
Display mode Hsync Vsync Dot frequency
VESA 640 x 480 31.5kHz 60Hz 25.175MHz
37.9kHz 72Hz 31.5MHz
37.5kHz 75Hz 31.5MHz
800 x 600 37.9kHz 60Hz 40.0MHz
48.1kHz 72Hz 50.0MHz
46.9kHz 75Hz 49.5MHz
1024 x 768 48.4kHz 60Hz 65.0MHz
56.5kHz 70Hz 75.0MHz
60.0kHz 75Hz 78.75MHz
1152 x 864 67.5kHz 75Hz 108.0MHz
1280 x 960 60.0kHz 60Hz 108.0MHz
1280 x 1024 64.0kHz 60Hz 108.0MHz
1600 x 1200 75.0kHz 60Hz 162.0MHz
US text 720 x 400 31.5kHz 70Hz 28.3MHz
No. Function No. Function
1 TMDS data 2- 16 Hot plug detection
2 TMDS data 2+ 17 TMDS data 0-
3 TMDS data 2/4 shield 18 TMDS data 0+
4 N.C. 19 TMDS data 0/5 shield
5N.C. 20N.C.
6 DDC clock 21 N.C.
7 DDC data 22 TMDS clock shield
8 Analog vertically
synchronised signal 23 TMDS clock +
9 TMDS data 1- 24 TMDS clock -
10 TMDS data 1+ C1 Analogue red image signal
11 TMDS data 1/3 shield C2 Analogue green image signal
12 N.C. C3 Analogue blue image signal
13 N.C. C4 Analogue horizontally
synchronised signal
14 +5V C5 Analogue GND
15 GND
1 7
6
5432 8
9 15
14
13121110 16
17 23
22
21201918 24
C1 C2
C3 C4 C5

LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 3
■
■■
■Power management
The monitor is based on the VESA DPMS and the DVI DMPM stan-
dards.
To activate the monitor's Power Management function, both the video
card and the computer must conform to the VESA DPMS standard and
the DVI DMPM standard.
DPMS: Display Power Management Signalling
* Not using USB hub
DMPM: Digital Monitor Power Management
* Not using USB hub
■
■■
■DDC (Plug & Play)
This monitor supports the VESA DDC (Display Data Channel) standard.
DDC is a signal standard for carrying out Plug & Play functions on the
monitor or PC. It transfers information such as degree of resolution
between the monitor and PC. You can use this function if your PC is
DDC compliant and if it is set so that it can detect the Plug & Play mon-
itor.
There are many varieties of DDC due to the differences between sys-
tems. This monitor works with DDC2B.
2. PRODUCT DESCRIPTION
DPMS mode Screen Power
consumption H-sync V-sync
ON Display on 53W
*
Yes Yes
STANDBY
Display off 3W
No Yes
SUSPEND Yes No
OFF No No
DMPM mode Screen Power
consumption
ON Display on 53W
*
OFF Display off 3W
1. INPUT button To switch between the signal's input termi-
nals.
2. MENU button This button is used to pop-up, select and
close the OSD (On Scree Display) Menu.
3.
c button This button is used to select menu options
when the OSD Menu is displayed.
4.
ed buttons When the OSD Menu is displayed:
These buttons are used to increase or
decrease the value of a selected option.
When the OSD Menu is not displayed:
These buttons are used to adjust back-
light brightness.
5. Power button
6. Power LED This LED is lit green when in use and
orange when in power-saving mode.
7. DVI-I input terminal The computer's digital RGB output terminal
or analogue RGB output terminal can be
connected here.
For a digital signal input: It can be con-
nected to a computer with a DVI-compatible
output terminal (DVI-D24 pin or DVI-I29 pin)
and which has UXGA output ability.
Depending on the computer to be con-
nected, correct display may or may not be
possible.
8. USB port (upstream: 1 port)
9. USB port (downstream: 2 ports)
10.Security lock anchor By connecting a security lock (commercially
available) to the security lock anchor, the
monitor is fixed so that it cannot be trans-
ported.
The security slot works in conjunction with
Kensington Micro Saver Security Systems.
11.Power terminal
12.Main power switch
13.Ventilation openings Note: Never block the ventilation openings
as this may lead to overheating inside
the monitor and result in malfunction.
123 4 56 7 89 10 11
12
13

LL-T2020 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 4
■
■■
■Height adjustment, angle adjustment, rotation (long height/width)
Caution:
• Pressure from hands on the LCD panel could cause damage.
• Be careful not to allow your fingers to be pinched.
1) Height adjustment
Adjust to an easy to view height.
2) Angle adjustment
Adjust to an easy to view angle.
3) Rotation (long height/width)
The display can be rotated for a long height or width to suit the dis-
played content.
• Before rotating, move the display to its uppermost position. If the dis-
play is rotated while it is set low, it will contact the stand and could
lead to damage.
• The display can only be rotated through a range of 90°. Applying
excessive force may cause malfunction.
• Do not apply excessive force when the cable is connected.
To set to long height
Gently turn in the clockwise direction (to 90°).
To set to long width
Gently turn in the counterclockwise direction (to 90°).
Note: The orientation of the display can be changed using Pivot Soft-
ware.
Approx. 60mm
approx. 45
approx. 45
approx. 30
approx. 5

LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 1
CHAPTER 2. CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
1. CONNECTING THE MONITOR AND TURNING THE MONITOR ON AND OFF
Caution:
• When connecting, ensure that both the monitor and computer are
switched off.
• Be careful not to overly bend the cable or add extension cords as
this could lead to a malfunction.
Cable storage
If necessary, excess cable can be housed in the stand.
1. Remove the cover.
Gently pull the top of the cover towards yourself.
2. Run cable along the back of the stand.
Pass cable in front of the stand, and then bring it through the back.
• If the display is to be rotated, first house the cables with the dis-
play in the long height position, so there is sufficient length when
the display is turned.
3. Refit the cover.
Be careful not to pinch the cable.
• If the cover is hard to refit, do not force it.
Check whether cables are trapped.
Caution: If the display is to be rotated, first house the cable, and then
check while gently turning the display. If it cannot be turned,
rehouse the cable with sufficient slack. (If there is insufficient
cable length, rotation will be impossible. Forcing rotation may
cause cable disconnection.)
1-1. Connecting the monitor to a computer
The accessory signal cable enables connection of two computers.
(One analog and one digital connection.)
• To achieve an analog and digital connection for two computers, a
separately sold signal cable is required.
• The separately sold 2-input cable enables connection of two comput-
ers to the DVI-I input terminal.
• When using the 2-input cable, set the connecting input terminal
[INPUT-1] or [INPUT-2] to [2LINES] under the MODE SELECT-1
Menu.
■
■■
■Analog connection
Connect the analog signal cable to the analog RGB output terminal of
the computer.
• Paying attention to connector direction, firmly insert the signal cable
to terminal, and then tighten the screws at both sides.
Input terminal 1 and 2
You can connect to
either side.
Analog RGB output
terminal
Analog signal cable

LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 2
If connecting to a D-sub 15 pin 2 row Apple Power Macintosh, attach a
Macintosh conversion adapter (commercially available) to the analog
signal cable.
Note: If connecting to the Sun Ultra series, a conversion adapter (com-
mercially available) may be required.
■
■■
■Digital connection
Connect the digital signal cable to the digital RGB output terminal of the
computer.
• For digital RGB connection, the monitor has an input for connecting
to a computer with a DVI-compatible output connector (DVI-D 24 pin
or DVI-I 29 pin) and UXGA output capability.
(Depending on the type of computer to be connected, the display may
not work correctly.)
• Use the accessory digital signal cable or an NL-C04J cable (sold sep-
arately).
If using other commercially available digital signal cables, correctly
display may not be achieved. UXGA resolution may not be available
when using the NL-C01E digital signal cable.
• Paying attention to connector direction, firmly insert the signal cable
to terminal, and then tighten the screws at both sides.
Set the monitor as follows when establishing a digital connection with a
Power Mac using an ADC-DVI adapter made by Belkin. (Operation has
been checked with the Power Mac G4 M7627J/A)
• Perform settings with the Power Mac power supply off.
1. After connecting the power cord, turn on the monitor's main power.
2. Press the
e button and d button simultaneously, and while doing
this press the POWER button (i.e. turn the power on).
3. Set the input terminal to which the Belkin ADC-DVI adapter is con-
nected to ON.
Use the
c button to select [INPUT1] or [INPUT2], and use the ed
buttons to select [ON] and [OFF].
• Do not set to [ON] if you are not using a Belkin ADC-DVI adapter,
as this may result in incorrect display.
4. Press the power button, and turn off the monitor power.
This completes setting.
■
■■
■When connecting using a separately sold 2-input cable
The separately sold 2-input cable (NL-C03J) enables connection
between the DVI-I input terminal on the monitor and the two PCs.
(One analog and one digital connection.)
1. Connect the 2-input cable to the DVI-I input terminal of the monitor,
and then connect the analog signal cable (commercially available)
and the digital signal cable to the 2-input cable.
• For analog connection, use the commercially available analog
signal cable (both ends should be mini D-sub 15 pin).
2. Connect each signal cable to the computers.
• Paying attention to connector orientation, firmly insert the signal
cable into the PC, and then tighten the screws at both sides.
Note:
• When using the 2-input cable, set the connecting input terminal
[INPUT-1] or [INPUT-2] to [2LINES] under the MODE SELECT-1
Menu.
• The monitor connected to the 2-input cable by analog connection
may not be automatically recognized and setup under Plug & Play.
Perform storage of setup information manually.
1-2. Connecting the monitor to a power source
Macintosh conversion adapter
Input terminal 1 and 2
You can connect to
either side.
Digital RGB output
terminal
Digital signal cable
MAC DIGITAL
INPUT-1
INPUT-2 OFF OFF ON ON
2-input cable
(purchased
separately)
mini D-sub 15 pin
Analog signal cable
(commercially available)
Digital signal cable
DVI-D24 pin
Input terminal 1 and 2
You can connect to
either side.
Analog RGB output terminal
Analog signal cable
Digital RGB output terminal
Digital signal cable
Power terminal
AC outlet
Power cord

LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 3
1-3. Connecting a USB device
This monitor is equipped with a USB standard (Rev. 1.1) self-powered
hub.
Downstream (2 ports)
Each of these ports enables connection of a USB device with working
current up to 500 mA.
Upstream (1 port)
This enables connection of a USB compatible computer or USB hub.
Note:
• If a USB cable is required, please use the one included.
• Before connecting, ensure that the shape of the USB cable con-
nector is correct.
• For information regarding the USB function (such as set-up) please
refer to the operation manual of the computer to be connected.
• Some computers, OS and other devices may not be able to be acti-
vated. To ascertain a certain device's USB compatibility, please
contact the manufacturer of the device.
1-4. Turning the power on
1. Turn on the main power of the monitor.
• When switching the main power switch on and off, always wait for
an interval of at least 5 seconds. Rapid switching may result in
malfunction.
2. Press the monitor's POWER button.
The power LED will light up orange.
3. Turn on the computer.
When a signal is input from the computer, the power LED lights up
green, and the screen is displayed (After power is turned on, it may
take a little time until the screen is displayed.)
• If the input terminal to which the computer is connected has not
been selected, the screen will not be displayed. If necessary, per-
form input terminal switching. (right column)
Notes: (when using an analog signal)
• If using the monitor for the first time or after having changed the
system settings during use, perform an automatic screen adjust-
ment.
• When connecting to a notebook, if the notebook computer's screen
is set so that it is displaying at the same time, the MS-DOS screen
may not be able to display properly. In this case, change the set-
tings so that only the monitor is displaying.
1-5. Changing between input terminals
Use the INPUT button to switch between signal input terminals.
When not using a 2-input cable
When using a 2-input cable
When selecting the input terminal connected to the 2-input cable, the
input terminal [INPUT-1] or [INPUT-2] is displayed, followed by the sym-
bol for analog [-A] or digital [-D].
(Example when connecting the 2-input cable to input terminal 2 [INPUT-
2])
Note: When there is no input signal, [NO SIGNAL] is displayed.
Upstream
Downstream
USB cable
Main power switch
ON
Turn on the
computer power
supply.
Press power button
INPUT-1
< > INPUT-2
< >
INPUT
Select [INPUT-1] Select [INPUT-2]
The input signal type (ANALOG/DIGITAL) is
displayed within angle brackets < >.
INPUT-1
< >
INPUT
INPUT INPUT
<ANALOG>
or <DIGITAL>
INPUT-2-A
<ANALOG> INPUT-2-D <DIGITAL>
Select [INPUT-1]
Select [INPUT-2]
(analog) Select [INPUT-2] (digital)

LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 4
1-6. Turning the power off
1. Turn the computer off.
2. Press the monitor's POWER button.
The Power LED will disappear.
If the monitor will not be used for a long time, turn off the main power
switch of the monitor, and remove the power plug from the outlet.
1-7. Instructions for attaching a VESA compliant arm
An arm or stand based on the VESA standard (commercially available)
can be attached to the monitor.
Procurement of the arm or stand is at the customer's discretion.
■
■■
■Arms or stands able to be used
Attachments must satisfy the following.
• Compatible with the VESA standard.
• Have a gap of 100 mm x 100 mm between the screw holes on the
section to be attached.
• Not be likely to fall off or break off after being attached to the monitor.
■
■■
■How to attach the arm or stand
• Be careful not to overly bend the cable or add extension cords as this
could lead to malfunction.
• While following these instructions, please also refer to the installation
instructions in the operation manual included with the arm or stand.
1. Remove the cable.
2. Spread out a soft cloth on a suitable horizontal surface.
3. Being careful not to damage the monitor, gently lay the monitor on it
display-side down.
4. Remove the four screws and then remove the stand from the moni-
tor.
Note:
• The stand is specially made for use with this monitor. Once having
removed the stand, never attempt to attach it to another device.
• Once having removed the screws, store them together with the
stand and if the stand is ever re-attached be sure to use the original
screws.
Using different screws could lead to a malfunction.
5. Attach the arm to the monitor with the four screws.
Note: The screws used to attach the arm should be M4 screws with a
length of 6 mm ~ 8 mm protruding from the surface to be
attached. Using different screws could lead to malfunction or
may lead to the monitor falling off, internal damaged, personal
injury.
Caution:
Securely grasp both the display and stand, and gently tip over.
When the monitor is inclined, the stand may suddenly pop out and
cause injury.
OFF
Turn the computer off Press power button
Caution:
Do not disassemble the stand. Parts may spring out and cause
injury.
6~8mm
Screw used to attach arm
Arm
Part of monitor to which arm is attached

LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 5
1-8. Information about the Pivot Software (Long height/width display)
When rotating the display, change the display orientation using Pivot
Software.
Compatible operating systems (OS) for the Pivot Software that comes
with the monitor:
Windows 98/2000/Me/XP
Macintosh OS 8.x - 9.1
• Depending on the graphics accelerator, it may be impossible to use
Pivot Software, even with a compatible OS.
For production information and inquiries regarding Pivot Software:
Portrait Displays, Inc.
(http://www.portrait.com)
■
■■
■Installation of Pivot Software
For Windows
1. Quit all applications being used.
2. Load the accessory CD-ROM into the CD-ROM drive of the com-
puter.
3. Open the [My computer] CD-ROM.
4. Double click on the [Pivot] folder.
5. Double click on [SETUP.exe].
6. Click [Next].
7. Choose [I accept the tems in the License Agreement].
8. Click [Next].
9. Input your Customer information [User Name] and [Organization].
10. Click [Next].
11. Click on [Install].
Installation will begin.
12. When the message indicating installation is finished is displayed,
click [Next].
13. Click on [Finish].
14. Click on [Yes] and restart the computer.
For Macintosh
1. Quit all applications being used.
2. Load the accessory CD-ROM into the CD-ROM drive of the com-
puter.
3. Open the CD-ROM.
4. Double click on the [Pivot] folder.
5. Select the desired language.
6. Double click on [Install MacPortrait].
7. Drag the [MacPortrait Install] icon onto the desired disk.
Installation will begin.
8. When the message indicating installation is finished is displayed,
click on [Restart].
■
■■
■Switching display direction
For Windows
1. Click the right mouse button or click the left mouse button on at
the lower right of the screen.
2. Select [Rotate], [Rotate to 0] or [Rotate to 90].
For Macintosh
Choose [ROTATE Now] from at the lower right of the screen.
Each time [ROTATE Now] is selected, the display direction switches.
Note:
• Rotation of the display to match the display direction is done manu-
ally.
• The display direction on the OSD menu is switched using [OSD
PIVOT] on the [MODE SELECT-2] menu.
Rotate: The display direction switches.
Rotate to 0: The display direction is switched to long width.
Rotate to 90: The display direction is switched to long height.

LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 6
2. ADJUSTMENT
2-1. ADJUSTMENT METHOD
MENU
MENU
MENU
MENU ADJUSTMENT AUTO
CLOCK
PHASE
H-POS
V-POS
GAMMA
MENU GAIN
CONTROL AUTO
BLACK LEVEL
CONTRAST
MENU
COLOR
CONTROL
COLOR MODE (sRGB, STD, VIVID)
COOL STD
WHITE BALANCE WHITE BALANCE
WARM USER
R-CONTRAST
G-CONTRAST
B-CONTRAST
MENU MODE SELECT-2 OSD
OSD V-POSITION
OSD PIVOT
SCALING
LANGUAGE
MENU
MENU
MENU
MENU
MENU
MENU
MENU MODE SELECT-1 INFORMATION
OFF TIMER
INPUT-2
400 LINES
OSD H-POSITION
1) Resetting all adjustment values. 7) SET/RESET of Usage Time
2) ADJUSTMENT menu reset (Analog only)
4) Adjusting the backlight
5) Checking product information
8) Display adjustment
3) Adjustment lock and lock release
While pressing + , turn on the power. , turn on the power.
6) Aging
While pressing + , turn on the power.
simultaneously.Press +
While pressing While pressing
While pressing
, turn on the power.
Adjust with and
While pressing , turn on the power.
(Analog only)
(Analog only)
(Analog only)
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
INPUT-1 (Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(Adjust with .)and
(When ON, Adjust with .)and
(Display)
(Select with .)
x 10000
RESET
x 1000
x 100
x 10
x 1
SET/RESET USAGE TIME
USAGE TIME
10000
1000
100
10
1
0
0
0
0
0
MANUAL RESET
INPUT
HUE
SATURATION
6 COLORS
MENU
RED HUE
SATURATION
YELLOW
GREEN
CYAN
BLUE
MAGENTA
*Same as RED.
MENU

LL-T2020 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 7
2-2. ADJUSTMENT ITEM LIST
BUTTON ITEM ADJUSTMENT DESCRIPTION
MENU MENU 1:
ADJUSTMENT MANUAL CLOCK 0~255 CLOCK: The figure below demonstrates how to adjust so that vertical flicker noise is not emitted. (
ed buttons)
MENU 1
4
MENU 2
4
MENU 3
4
MENU 4
4
MENU 5
4
MENU END
PHASE 0~31 PHASE: The figure below demonstrates how to adjust so that horizontal
flicker noise is not emitted. (
ed buttons)
H-POS 0~ H-POS (horizontal positioning) and
V-POS (vertical positioning)
To center the screen image within the boundaries of the screen, adjust
the left-right (H-POS) values and the up-down (V-POS) values. (
ed but-
tons)
V-POS 0~
AUTO Automatic screen adjustment
Options in the ADJUSTMENT Menu can be adjusted automatically
(CLOCK, PHASE, H-POS V-POS).
MENU 2:
GAIN CONTROL MANUAL BLACK LEVEL 0~100 BLACK LEVEL: Total screen brightness can be adjusted while watching the color pattern. (
ed buttons)
CON-
TRAST 0~100 CONTRAST: While watching the color pattern, adjustments can be made so that all graduations appear. (
ed buttons)
AUTO GAIN CONTROL Menu
AUTO: Every menu option is automatically adjusted using the Auto
Gain Control function.
MENU 3:
COLOR CONTROL COLOR MODE sRGB, STD, VIVID STD: Displays image with the color tone results from original scheme of liquid crystal panel.
sRGB: sRGB is international standard of color representation specified by
IEC (International Electrotechnical Commission). Color conversion
is made in taking account of liquid crystals characteristics and rep-
resents color tone close to it original image.
VIVID: Displays an image with dynamic and VIVID primary colors.
WHITE BALANCE COOL • STD • WARM
(5 levels),
USER R • G • B:
0~255
WHITE BALANCE Menu
COOL : Color tone bluer than standard
• : Color tone slightly bluer than standard
STD : Color tone standard setting
• : Color tone slightly redder than standard
WARM : Color tone redder than standard
USER
R-CONTRAST :
e button for blue-green
d button for red
G-CONTRAST :
e button for purple
d button for green
B-CONTRAST :
e button for yellow
d button for blue
GAMMA -10~10 Adjust so that dark and bright images are easy to see. If the screen is dark
and hard to see, increase the numerical value. If it is bright and hard to see,
lower the numerical value. (
ed buttons)
HUE -20~20 Hue can be adjusted. (
ed buttons)
SATURATION -50~50 Color saturation can be adjusted. (
ed buttons)
At the minimum value, the screen is black and white.
6 COLORS RED, YELLOW,
GREEN, CYAN,
BLUE, MAGENTA
Hue (HUE) and saturation (SATURATION) may be adjusted by color.
MENU 4:
MODE SELECT-1 IINFORMATION A model name (MODEL), a serial no. (S/N), and usage time (USAGE TIME) of the display can be checked.
OFF TIMER ON (1 - 23 hours) • OFF Power is automatically shut off when the set time elapses.
INPUT-1 1LINE •2LINES Set [1 LINE] when connecting digital or analog signal cables to a DVI-I
input terminal (INPUT-2) on the display.
Set [2LINES] when connecting a 2-input cable.
INPUT-2 1LINE • 2LINES
MENU 5:
MODE SELECT-2 OSD H-POSITION OSD H-POSITION (OSD horizontal position) The position of the OSD display can be moved to the left and right.
(
ed buttons)
OSD V-POSITION OSD V-POSITION (OSD vertical position)
The position of the OSD display can be moved up and down. (
ed buttons)
OSD PIVOT OFF (landscape) •
ON (portrait ) The orientation of the OSD display can be changed.
LANGUAGE 7 countrys
DEUTSCH,ENGLISH,
ESPANOL,
FRANCAIS, ITAL-
IANO, NETHER-
LAND, SVENSKA
LANGUAGE
Messages displayed on the screen and OSD Menu contents can be
changed to the following languages.
Dutch, English, French, German, Spanish, Italian, Swedish.
SCALING 0~4 SCALING (Level of scaling)
The sharpness of the image can be adjusted. (
ed buttons)
400 LINES 640 • 720 400 LINES (degree of resolution)
You can specify the horizontal resolution of a 400-line screen when
using US text, etc.(
ed buttons)
640: 640 u 400 dot mode
720: 720
u 400 dot mode (US text etc.)
c Select the item
ed 0~31 Adjusting the backlight
POWER ON, OFF

LL-T2020 DISASSEMBLY AND ASSEMBLY
3 – 1
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
B
C
F
h
g
H
H
F
F
K
O
P
L
L
M
NN
jk
E
F
G
D
B
B
B
B
C
J
J
C
I
I
C
Ca
b
i
c
d
e
f
B
3
4
910
10 11
13
14
15
16
17
18
20
19
21
12
6
7
8
5
A
A2
1
1. SEPARATING DISPLAY UNIT FROM STAND UNIT
1) Remove the screw A . Separate the display unit 1 from the stand unit 2 .
2. DISASSEMBLING DISPLAY UNIT
1) Remove the screw B and then remove the display cover 3 .
2) Remove the screw
C and then remove the shield plate 4 .
3) Remove the connector pin
a and screw D . Remove the USB board 5 .
4) Remove the connectors (
b , c , d , e ) and screws ( E , F ). Remove the main board
6 .
5) Remove the screw
G and then remove the PS switch cover 7 .
6) Remove the connector
f and screw H . Remove the power supply board 8 .
7) Remove the screw
I and then remove the shield plate 9 .
8) Remove the screw
J and then remove the connector locking seat F .
9) Remove the connectors (
g , h , i ) and screw K . Remove the inverter board G .
10) Remove the display mask unit
H .
11) Remove the screw (
L , M , N , O ). Remove the LCD angles
(
I , J , K , L ).
12) Remove the board angles (
M , N ).
13) Remove the connector
j from the LCD unit O .
14) Remove the screw
P . Remove the key
switch angle
P .
15) Remove the key unit
Q and then remove
the connector
k .

LL-T2020 DISASSEMBLY AND ASSEMBLY
3 – 2
A
A
BE
F
H
JJ
J
G
H
I
I
B
B
C
D
D
1
2
34
5
6
7
9
10
14
15
16
17
12
13
11
8
3. DISASSEMBLING STAND UNIT
1) Remove the screw A . Separate the arm unit 1 from the base unit 2 .
2
) Remove the cable cover 3 .
3
) Remove the screw B and then remove the base arm cover 4 .
4
) Remove the screw C and then remove the base arm cover 5 .
5
) Remove the screw D and then remove the base arm install angle 6 .
6) Remove the screw
E and then remove the slide guide 7 .
7
) Remove the base arm angle 8 .
8) Remove the screw
F and then remove the slide arm cover 9 .
9) Remove the screw
G and then remove the slide arm cover F .
10) Remove the screw
H and then remove the slide arm angle G .
11) Remove the screw
I and then remove the hinge covers ( H , I ) from
the hinge unit
J .
12) Remove the screw
J and then remove the stand base plates ( K , L )
from the stand cover
M .

LL-T2020 TROUBLESHOOTING
4 – 1
CHAPTER 4. TROUBLESHOOTING
(Yes)
(Yes)
(Yes)
(Yes)
(Yes)
(Yes)
Green LED comes on when the power button is
pressed?
The screen is displayed properly in each video
mode?
AC cable is connected to the power supply
unit?
Input signal port is the one to which analog
signal cable is connected?
Test terminals LD401, LD402, and LD403 are
DC+3.3V?
Test terminal LD623 changes its level when
POWER switch is turned on and off?
Press INPUT key to switch over to the
correct input signal port.
Check DC+5V power supply line (DV5A)
and POWER_CTL1 signal and circuits
around Q807.
Check the connection line of LD623, and
check the CN601, SW PWB and cable.
Remove the analog signal cable. After a short
while time, the LED color changes form green
to orange.
(Yes)
(Yes)
(No)
(No)
(Yes)
(Yes)
(No)
(No)
(No)
(No)
(Yes)
(Yes)
(No)
(No)
(No)
(No)
(No)
(Yes)
(No)
(Yes)
(Yes)
(No)
(No)
(No)
Perform 1
B/L is lit?
No error.
Check AC cable connection.
Check power supply unit switch.
Check circuits around IC601.
Check circuits around IC801.
Check circuits around IC401.
Check RESET circuit around IC602.
Check IC602 and clock circuit around X601.
Check SW101 and circuits around IC101.
The power supply unit is switched on?
SW101 is on 1st pin side?
Test terminal LD811 is DC+5V?
Test terminal LD815 is DC+5V?
4th pin of IC602 is in H level (DC+5 V)?
C610-side terminal signal of X601 is normal?
Test terminal LD608 is DC+3.3V?
1
Perform 2
Perform 3
Perform 4
Check whether the following cables are connected correctly.
In addition, check whether the PCs video mode is properly set to the signal timing which meets this machine.
Attached cables
Dedicated AC adapter
Dedicated analog signal cable (DVI-A cable)
Dedicated digital signal cable (DVI-D cable)
The display does not work. (with analog connection, DVI-A cable use)

LL-T2020 TROUBLESHOOTING
4 – 2
(No)
(No) (No)
(No)
(No)
(Yes)
(Yes)
(Yes)
(No)
(Yes)
(Yes)
(No)
(Yes)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(Yes)
(Yes)
(Yes)
(No)
(No)
The port from which the analog signal cable
was removed is the input signal port selected?
48th pin and 49th pins of IC602 are in H level
(DC+3.3V)?
LD613 and LD616 are in H level (about
DC+1.9V)?
LD808 is less than DC+1.0V at maximum
brightness?
1st pin of CN2, CN3, CN4, CN5, CN6, and CN7
on inverter PWB unit is about 790 Vrms? (Use
caution not to get electric shock accident. Use
a high-voltage probe (more than 100:1) for
measuring voltage.)
Check analog signal cable and CN101
(CN201).
Check SDA and SCL signals and circuits
around IC402 and IC602.
Press INPUT key to switch over to the
correct input signal port.
When CN802 cable is removed, check the
LD801 is DC+12V.
Check inverter unit, inverter cable and their
connections.
Check the power unit and cable and their
connections, and DC+12V power supply
line.
Check BL_EN signal and circuits around
CN802.
Check BRT_VR signal and circuits around
IC604.
Signal waveforms of test terminals LD304,
LD305 (LD317, LD318) are normal?
Signal waveforms of test terminals LD312,
LD323 (LD313, LD324) are normal?
Signal waveforms of 31st and 32nd pins of
IC402 are normal?
Check SW PWB and SW cable and their
connections.
48th pin of IC602 is in H level (DC+3.3V)?
continued from 1
LD613 is H in level (about DC+1.9V)?
Check SW PWB and SW cable and their
connections.
Test terminal LD801 is DC+12V?
LD807 is in H level (DC+5V)?
Check lamp inside LCD module.
Check circuits around IC602.
Check Q601 and its surrounding circuits.
Replace inverter PWB unit with a new one.
Check circuits around IC602.
Check Q601 and its surrounding circuit.
Check circuits around IC301 and IC302.
2
3

LL-T2020 TROUBLESHOOTING
4 – 3
(No)
(No)
(No)
(Yes)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(Yes)
(Yes)
(No)
(No)
(No)
(Yes)
(Yes)
(Yes)
(Yes)
(No)
(Yes)
(No)
(No)
(No)
(Yes) (No)
(No)
(Yes) (No)
(Yes)
(Yes)
Check DC+5V power supply line (PV5) ,
POWER_CTL3 signal, and circuits around
Q807.
Check DC+2.5V power supply line (DV25),
POWER_CTL4 signal, and circuits around
IC802.
Check DC+12V power supply line (LCDV),
POWER_CTL2 signal, and circuits around
Q803.
Check clock circuit around IC501 and X501.
Clock (R508) and DE (R502) signal outputs
are normal?
ADJUSTMENT and MODE SELECT are set
properly?
Signal waveform of test terminal LD502 is
normal?
ADJUSTMENT and MODE SELECT are set
properly?
Adjust according to "screen adjustment
procedure".
Adjust according to "screen adjustment
procedure".
Check circuits around IC301, IC302, and
IC402.
Check circuits around IC701, and CN701
and LCD module.
Check DC+5V power supply line (DV5A),
POWER_CTL1 signal, and circuits around
Q807.
Test terminals LD405, LD523, and LD701 are
DC+3.3V?
Signal waveform of test terminal LD565 is
normal?
Test terminals LD401, LD402, and LD403 are
DC+3.3V?
Test terminal LD815 is DC+5V?
Test terminal LD806 is DC+5V?
Test terminal LD801 is DC+12V?
Test terminal LD501 is DC+2.5V?
LD816 is DC+12.0V?
36th pin of LC602 is in H level (DC+5V)?
The entire LCD screen is white?
The entire LCD is black?
The size of LCD screen is abnormal?
LCD screen jitters or flickers?
Check circuits around IC401.
Check circuits around IC403.
Check circuits around IC601.
Test terminal of LD701 is DC+12V?
Check circuits around X601 and IC602.
Check circuits around IC502.
Check circuits around CN701.
Check PLL circuits around IC402.
Check circuits around IC502.
4
Check inverter unit, inverter cable and their
connections.
(No)
(Yes)
When CN802 cable is removed, LD801 is
DC+12V?
Check the power unit and cable and their
connections, and DC+12V power supply
line.

LL-T2020 TROUBLESHOOTING
4 – 4
(No)
(No)
(No)
(Yes)
(Yes)
(Yes)
(Yes)
(No)
(No)
(Yes) (No)
(No)
(Yes)
(Yes)
(Yes)
(No)
(Yes)
(No)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(Yes)
(No)
(Yes)
(Yes)
(No)
(No)
(Yes)
(Yes)
GAIN CONTROL and WHITE BALANCE
are set properly?
Analog color signal output (C302, C303,
C305, C319, C320, and C322) is normal?
Digital color signal output of IC402 (ID0
ID47) is normal?
Digital color signal output of IC502 (OD0
OD47) is normal?
Check circuits around IC701, and CN701
and LCD module.
Check circuits around IC402, IC404, and
IC602.
Digital color signal output of IC402 (ID0
ID47) is normal?
Press INPUT key to switch over to the
correct input signal port.
Check CN101 and 201, and signal source
and digital signal cable.
Check circuits around IC101, IC103 and
IC201.
Check CN101 and 201, and signal source
and digital signal cable.
Display is normal in composite sync and sync-
on-green signal input.
Adjustment settings are stored after display
screen is adjusted?
AUTO function of GAIN CONTROL operates
properly?
Input signal port is the one to which digital
signal cable is connected?
Waveforms of IC103s and 201s 1st and 2nd
pins change normally when resolution is
changed?
Test terminals LD110, LD111, LD112, LD113,
LD210, LD211, LD212, LD213 are DC+3.3V?
CN101 and 201 signals (at 1st, 2nd, 9th, 10th,
17th, 18th, 23rd, and 24th pins) are normal?
IC102 and IC202 signal output (ID0 ID47,
HIS, IVS, ICK, IACT) are normal?
LCD screen color is abnormal?
Input is changed over properly?
No error.
Display is normal in analog input?
LD101 and LD201 are in H level (DC+5V)?
Check circuits around IC502.
Adjust according to "screen adjustment
procedure".
Check circuits around IC402.
Check circuits around IC402 and IC502.
Check circuits around IC502 and IC701.
Check circuits around IC402 and IC404.
Check circuits around IC602.
check circuits around IC602 and IC605.
Check circuits around IC402.
First, check with analog signal input.
Check circuits around IC104 and IC203.
Check circuits around IC102 and IC202.
continued from 4
The display does not work. (with digital connection, DVI-D cable use)

LL-T2020 WAVE FORM
5 – 1
CHAPTER 5. WAVE FORM
Waveform measurement condition: Input each of the display patterns
and measure the waveform (tinming chart).
CAUTION
WAVE FORM 1: REFCK (LD565)
Frequency: 81MHz
Display screen: Arbitrary
2V/DIV, 10ns/DIV
WAVE FORM 2: XTAL (IC601 of 2PIN)
Frequency: 24MHz
Display screen: Arbitrary
1V/DIV, 25ns/DIV
WAVE FORM 3: VSYNC (LD305, LD318)
Frequency: 60Hz
Display screen: Arbitrary
1V/DIV, 5ms/DIV
WAVE FORM 4: HSYNC (LD304, LD317)
Frequency: 75kHz
Display screen: Arbitrary
1V/DIV, 5µ
µµ
µs/DIV
Wave-form
No. Measurement point Name of waveform Display pattern
1 LD565 REFCK Arbitrary
2 IC601 of 2PIN XTAL Arbitrary
3 LD305, LD318 VSYNC Arbitrary
4 LD304, LD317 HSYNC Arbitrary
5 LD502 ICK Arbitrary
6 LD504 VS Arbitrary
7 LF505 IHS Arbitrary
8 IC701 of 10PIN DCLK Arbitrary
9 IC701 of 9PIN DEN Arbitrary
10 LD300,LD301,
LD302 RGB OUT 16 monochromatic gradation patterns
Oscilloscope: Tektronix644B
Input signal: VESA1600 x 1200
H: 75kHz V: 60Hz
DOTCLK: 162MHz
GND
GND
GND
GND

LL-T2020 WAVE FORM
5 – 2
WAVE FORM 5: ICK (LD502)
Frequency: 81MHz
Display screen: Arbitrary
1V/DIV, 5ns/DIV
WAVE FORM 6: VS (LD504)
Frequency: 60Hz
Display screen: Arbitrary
1V/DIV, 5ms/DIV
WAVE FORM 7: IHS (LD505)
Frequency: 75kHz
Display screen: Arbitrary
1V/DIV, 5µ
µµ
µs/DIV
WAVE FORM 8: DCLK (IC701 of 10PIN)
Frequency: 81MHz
Display screen: Arbitrary
1V/DIV, 5ns/DIV
WAVE FORM 9: DEN (IC701 of 9PIN)
Frequency: 75kHz
Display screen: Arbitrary
1V/DIV, 5µ
µµ
µs/DIV
WAVE FORM 10: RGB OUT ( LD300, LD301, LD302)
Display screen: 16 monochromatic gradation patterns
0.5V/DIV, 5µ
µµ
µs/DIV
GND
GND
GND
GND
GND
GND