Sharp T19D1-H - LL - 19" LCD Monitor 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.
LLT19D1SME
LCD MONITOR
LL-T19D1-H
MODEL LL-T19D1-B
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. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1
CHAPTER 5. TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1
CHAPTER 6. CIRCUIT DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1
CHAPTER 7. PWB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 - 1
Model Name Product Name Color
For USA For Other
LL-T19D1H LL-T19D1U LL-T19D1E Gray
LL-T19D1B LL-T19D1Y LL-T19D1P Black

LL-T19D1 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 1
CHAPTER 1. OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1. SPECIFICATIONS
■
■■
■ Product specifications
• Model name
LL-T19D1-H (Frosty gray)/LL-T19D1-B (Black)
• LCD display
48 cm measured diagonally
TFT LCD module
• Resolution (max.)
SXGA 1280 x 1024 pixels
• Displayable colors (max.)
Approx. 16.77 million colors (8bit)
• Brightness (max.)
300cd/m
2
• Dot pitch
0.294 (H) x 0.294 (V) mm
• Contrast ratio
700 : 1
• Angle of visibility
Left-right 170°; Up-down 170° (contrast ratio s 10)
• Screen display size
Horizontal 376.3 mm x Vertical 301.1 mm
• Video signal
Analog: Analog RGB (0.7Vp-p) [75 Ω ]
Digital: DVI standard based on 1.0
• Sync signal
Separate Sync (TTL level: +/-), Sync on Green, Composite Sync (TTL
level: +/-)
• Expansion compensation
Digital scaling (Enlarges VGA/SVGA/XGA etc. to full screen size.)
• Plug & Play
VESA DDC2B compatible
• Power management
VESA: based on DPMS
DVI: based on DMPM
• Input signal terminal
Analog: 15 pin mini D-sub (3 rows) x 2
Digital: 24 pin DVI-D x 1
• Screen tilt
Upward approx. 0° - 20°; downward approx. 0° - 5°
• Screen swivel
Approx. 90° from left through right (Turn table type)
• Power supply
AC100 - 240V, 50/60Hz
• Temperature of operating environment
5 - 35°C
• Power consumption
43W maximum, 2.8W when in power-saving mode
• Dimensions
Approx.
423 (W) x 222 (D) x 392 - 439 (H) mm
• Weight
Approx. 6.9kg (approx. 4.7kg excluding stand)
(Excluding signal cable.)
■
■■
■ Dimensions (Units: mm)
• Analog signal cable: approx. 1.8 m
• Digital signal cable, NL-C01E (separately): approx. 2.0 m
■
■■
■ Relevant signal timings (analog)
• Recommended resolution is 1280 x 1024.
• All are compliant only with non-interlaced.
• Frequencies for Power Macintosh and Sun Ultra series are reference
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.
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
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
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
423
202
348 392 439
222
66

LL-T19D1 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 2
■
■■
■ Relevant signal timings (digital)
• Recommended resolution is 1280 x 1024.
• 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 SXGA 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 analog RGB input connector pin
■
■■
■ The DVI-D input connector pin
■
■■
■ Power management
The monitor is based on VESA DPMS and the DVI DMPM standards.
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 Manegament Signalling
DMPM: Digital Monitor Power Management
■
■■
■ 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.
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
US text 720 x 400 31.5kHz 70Hz 28.3MHz
No. Function No. Function
1 Red video signal input 9 +5V
2 Green video signal input 10 GND
3 Blue video signal input 11 N.C.
4 GND 12 DDC data
5 GND 13 For Hsync signal input
6 For red video signal GND 14 For Vsync signal input
7 For green video signal GND 15 DDC clock
8 For blue video signal GND
(Mini D-sub connector with 15 pins)
5 1234
10 6789
15 11121314
No. Function No. Function
1TMDS data 2- 13 N.C.
2TMDS data 2+ 14 +5V
3TMDS data 2/4 shield 15 GND
4N.C. 16 Hot plug detection
5N.C. 17 TMDS data 0-
6DDC clock 18 TMDS data 0+
7DDC data 19 TMDS data 0/5 shield
8N.C. 20 N.C.
9TMDS data 1- 21 N.C.
10 TMDS data 1+ 22 TMDS clock shield
11 TMDS data 1/3 shield 23 TMDS clock +
12 N.C. 24 TMDS clock -
DPMS mode Screen Power
consumption H-sync V-sync
ON Display on 43W Yes Yes
STANDBY
Display off 2.8W
No Yes
SUSPEND Yes No
OFF No No
DMPM mode Screen Power
consumption
ON Display on 43W
OFF Display off 2.8W
12345678
9
10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
(DVI-D connector with 24 pins)

LL-T19D1 OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 3
2. PRODUCT DESCRIPTION ■
■■
■ Height adjustment, angle adjustment
Caution:
• Pressure from hands on the LCD panel could cause damage.
• Do not attempt to move the monitor beyond its movement range.
Applying excessive force to move the monitor may damage the
product.
• Be careful not to allow your fingers to be pinched.
Height adjustment
• When positioning the display higher, hold the stand tight so that it
does not move together with the display.
Angle adjustment
1INPUT button To switch between the signal's input terminals.
2MENU button This button is used to pop-up, select and close
the OSD (On Screen Display) Menu.
3c/MODE
button When the OSD Menu is displayed: This button is used to select menu options.
When the OSD Menu is not displayed:
This button is used to set DISPLAY MODE.
4edbuttons When the OSD Menu is displayed:
These buttons are used to select an option or
adjust the value of the selected option.
When the OSD Menu is not displayed:
These buttons are used to adjust backlight
brightness.
5Power button Pressing this button turns the power on.
6Power LED This LED is lit green when in use and orange
when in power-saving mode.
7Main power switch
8Power terminal
9Analog RGB
input terminal
1 and 2
The analog signal cable is connected here.
FDVI-D input
terminal The computer's digital RGB output terminal can be connected here.
The separately-sold cable (NL-C01E) is neces-
sary for connection.
It can be connected to a computer with a DVI-
compatible output terminal (DVI-D24 pin or DVI-
I29 pin) and which has SXGA output ability.
Depending on the computer to be connected,
correct display may or may not be possible.
GSecurity lock
anchor By connecting a security lock (commercially available) to the security lock anchor, the monitor
is fixed so that it cannot be transported.
The security slot works in conjunction with Kens-
ington Micro Saver Security Systems.
HVentilation
openings Note: Never block the ventilation openings as this may lead to overheating inside the monitor and
result in malfunction.
1 2 3 4 5 6 7 8 9 10 11
12
Lowest position Highest position
approx. 47mm
approx. 20
approx. 60
approx. 45
approx. 45
approx. 20
approx. 5

LL-T19D1 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 1
CHAPTER 2. CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
1. CONNECTION
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.
1-1. Connecting the monitor to a computer
■Analog connection
Connect the analog signal cable to the analog RGB output terminal of
the computer.
• For analog connection, use the analog signal cable accessory or a
commercially available one (both ends should be mini D-sub15 pin).
• Paying attention to connector direction, firmly insert the signal cable
vertically into the connector, and then tighten the screws at both
sides.
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 separately-sold digital signal cable (NL-C01E) to the digital
RGB output terminal of the computer.
• The monitor has an input for connecting to a computer with a DVI-
compatible output connector (DVI-D24 pin or DVI-I29 pin) and SXGA
output capability. (Depending on the type of computer to be con-
nected, the display may not work correctly.)
• Paying attention to connector direction, firmly insert the signal cable
vertically into the connector, and then tighten the screws at both
sides.
1-2. Connecting the monitor to a power source
Analog RGB output terminal
Analog signal cable
Analog RGB input terminal 1 and 2
You can connect to either side.
Macintosh conversion adapter
DVI-D input terminal
Digital RGB output terminalDigital signal cable
Power cord
Power terminal
AC outlet

LL-T19D1 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 2
1-3. 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 malfunc-
tion.
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.
Notes:
• When using an analog signal, perform an automatic screen adjust-
ment under the following conditions:
– Using the monitor for the first time.
– After having changed the system settings during use.
• Depending on the computer or OS, it may be necessary to use the
computer to install monitor set-up information.
• 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 settings so
that only the monitor is displaying.
1-4. Changing between input terminals
Use the INPUT button to switch between signal input terminals.
1-5. 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.
Main power switch
Press power button. Turn on the computer
power supply.
ON
Analog RGB input terminal 1
Analog RGB input terminal 2 DVI-D input terminal
INPUT INPUT
INPUT
INPUT-1 ANALOG
INPUT-2 ANALOG INPUT-3 DIGITAL
Press power button.
Turn the computer
off.
OFF

LL-T19D1 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 3
1-6. 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.
Caution: Be careful not to get your fingers pinched between the display
and stand nor to let the stand drop. These could lead to injury.
1. Remove the cables.
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 cover.
• While pressing the Aareas on the sides, push it up.
5. Remove the six 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.
6. 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 cause the monitor to fall off or to be
internally damaged.
6 - 8 mm
Screw used to attach arm
Arm
Part of monitor to which arm is attached

LL-T19D1 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 4
2. ADJUSTMENT
2-1. ADJUSTMENT METHOD
7) Version display (for service)
While pressing , turn on
the power.
• Valid even when there is no input signal.
• The Model name version, the date, H-SYNC, V-SYNC and check
sum are displayed.
• When is pressed, the version display disappears.
• All the keys except for and the power key are dis-
abled.
• The version display keeps ON until or the power key
is pressed.
6) Aging (for service)
While pressing , turn on
the power.
• When the selftest is executed, no menu is shown.
• When the selftest is executed, the display shows Red 3Green
3Blue 3Yellow 3Purple 3Light Blue 3White 3Black
repeatedly.
• When the selftest is executed, all the keys except for the power
key are disabled.
• Turn off the power to terminate the selftest.
• When the signal is inputted, the screen inputted is displayed and
it does not entry into aging mode.
MENU
MENU
MENU
4) Adjusting the backlight buttons
5) Setting display mode
button (STD, OFFICE, sRGB, VIVID)
1) Resetting all adjustment values
Power ON
Power ON
Press the above two buttons at same time, and while turn the power on.
2) ADJUSTMENT menu reset Press the two buttons at same time.
3) Adjustment lock function
6) Screen adjustment
MENU ADJUSTMENT
(Analog)
(Analog)
(Analog)
AUTO
CLOCK
PHASE
H-POS
V-POS
AUTO
MENU GAIN CONTROL BLACK LEVEL
CONTRAST
MENU (COOL STD
WHITE BALANCE WARM USER)
R-CONTRAST
CONTRAST
(R/G/B)
G-CONTRAST
B-CONTRAST
MENU MODE SELECT
MENU
MENU
buttons
buttons
buttons
buttons
buttons
buttons
buttons
buttons
buttons
buttons
OSD H-POSITION
OSD V-POSITION
SCALING buttons
buttons
buttons
LANGUAGE buttons
END
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
/MODE
400 LINES buttons
/MODE
/MODE
Valid even when there is no input signal.
When the above procedure is executed, key lock/release is changed over.
When key lock is set, the black display is shown and "ADJUSTMENT LOCKED" is displayed for about 2 sec.
When key release is set, the black display is shown and "ADJUSTMENT UNLOCKED" is displayed for about 2 sec.
When key lock is set, all the keys except for the power key are disabled.
e dc /MODE
MODEL NAME : LL-T19D1
VERSION : 1.000
DATE : 2/07/2003
CHECK SUM : xxxx
H-SYNC. : X Hz
V-SYNC. : X kHz
MENU
MENU
MENU
c/MODE eMENU

LL-T19D1 CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 5
2-2. ADJUSTMENT ITEM LIST
BUTTON ITEM ADJUSTMENT DESCRIPTION
MENU MENU 1:
ADJUSTMENT MANUAL CLOCK 0~255 CLOCK:Adjust so that vertical flicker noise is not emit- ted. (e d buttons)
MENU 1
4
MENU 2
4
MENU 3
4
MENU 4
4
MENU END
PHASE 0~32 PHASE: Adjust so that horizontal flicker noise is not
emitted. (e d
e de d
e d buttons)
H-POS 0~255 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. (e d
e de d
e d buttons)
V-POS 0~64
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 0~63
BLACK LEVEL: Total screen brightness can be adjusted
while watching the color pattern.
(
e d buttons)
CONTRAST 0~63 CONTRAST: While watching the color pattern,
adjustments can be made so that all
graduations appear. (e d
e de d
e d buttons)
AUTO GAIN CONTROL Menu
AUTO:Every menu option is automatically adjusted
using the Auto Gain Control function.
MENU 3:
WHITE BALANCE
COOL • STD • WARM
(5 levels),
USER R • G • B: 0~63
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: ebutton for blue-green
dbutton for red
G-CONTRAST: ebutton for purple
dbutton for green
B-CONTRAST: ebutton for yellow
dbutton for blue
MENU 4:
MODE SELECT OSD H-POSITION (OSD horizontal position) The position of the OSD display can be moved to the left and right. (e d buttons)
OSD V-POSITION
(OSD vertical position) The position of the OSD display can be moved up and down. (e d buttons)
SCALING
(Level of scaling) 0~2 SCALING (Level of scaling) Adjusts the image to optimum sharpness when Screen
expansion is taken. (e dbuttons)
400 LINES
(degree of resolution)
640, 720 You can specify the horizonal resolution of a 400 line
screen when using US text, etc. (e dbuttons)
LANGUAGE 7 countrys
DEUTSCH, ENGLISH,
ESPANOL, FRANCAIS,
ITALIANO, 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.
c/MODE Select the item
sRGB, OFFICE, STD,
VIVID Setting color mode when the ADJUSTMENT Menu is not displayed.
STD: Displays image with the color tone results
from original scheme of liquid crystal panel.
OFFICE:Display brightness is lowered. The brightness
is set to a level that is easier on the eyes than
with other modes and saves power.
sRGB: sRGB is international standard of color repre-
sentation specified by IEC (International Elec-
trotechnical Commission). Color conversion is
made in taking account of liquid crystals char-
acteristics and represents color tone close to
it original image.
VIVID: Displays an image with dynamic and VIVID
primary colors.
e d Bright: 0~31 Adjusting the backlight
POWER OFF

LL-T19D1 DISASSEMBLY AND ASSEMBLY
3 – 1
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
1. STAND UNIT REMOVAL
1) Remove the rear cover by sliding it upward.
2) Remove the screws, and remove the stand unit (B).
2. I/F PWB REMOVAL
1) Remove the screws, and remove the rear cabinet.
2) Remove the screws, and remove the shield by sliding it upward.
3) Remove the connector and flat cable.
4) Remove the hex. screws, washer and screws, and remove the I/F
PWB by sliding it upward.
3. P/I PWB REMOVAL
1) Remove the connector covers (A), and remove the connectors.
2) Remove the screws, and remove the P/I PWB (B).
4. LCD UNIT REMOVAL
1) Remove the screws, and remove the front cabinet (A).
2) Remove the screws, and remove the LCD unit (C) from the bracket
panel (B).
A
B
B
A
A
B
A
C

LL-T19D1 BLOCK DIAGRAM
4 – 1
CHAPTER 4. BLOCK DIAGRAM
KEY_SWITCH UNIT
INPUT1 ANALOG
INPUT2 ANALOG
INPUT3 DIGITAL
POWER /INVERTER
UNIT
AC SW
19 inch LCD
LAMP
LAMP
LCD UNIT
LCD SIGNAL INPUT
INTERFACE
UNIT

LL-T19D1 BLOCK DIAGRAM
4 – 2
■
■■
■CONNECTOR SIGNAL TABLE
Connector CN100
Connector CN300
Connector CN500
Connector CN601
Connector CN602
Connector CN603
1 +12V
2 +12V
3 +12V
4N.C
5GND
6GND
7GND
8 BLK_ON/OFF
9 BRIGHTNESS
1GND
2 INPUT
3 LED_GREEN
4 LED_AMBER
5POWER
6RIGHT
7 LEFT
8MODE
9 MENU
1ATX0-
2ATX0+
3ATX1-
4ATX1+
5ATX2-
6ATX2+
7GND
8 ACLKT-
9 ACLKT+
10 ATX3-
11 ATX3+
12 BTX0-
13 BTX0+
14 GNC
15 BTX1-
16 BTX1+
17 GND
18 BTX2-
19 BTX2+
20 BCLKT-
21 BCLKT+
22 BTX3-
23 BTX3+
24 GND
25 GND
26 N.C
27 N.C
28 VPNL
29 VPNL
30 VPNL
1RED
2GREEN
3BLUE
4GND
5GND
6GND
7GND
8GND
9+5V
10 GND
11 GND
12 SDA
13 H-SYNC
14 V-SYNC
15 SCL
1RED
2GREEN
3BLUE
4GND
5GND
6GND
7GND
8GND
9+5V
10 GND
11 GND
12 SDA
13 H-SYNC
14 V-SYNC
15 SCL
1RX2-
2 RX2+
3GND
4N.C
5N.C
6SCL
7SDA
8N.C
9RX1-
10 RX1+
11 GND
12 N.C
13 N.C
14 DVI_5V
15 +5V
16 DVI_5V
17 RX0-
18 RX0+
19 GND
20 N.C
21 N.C
22 GND
23 RXC+
24 RXC-

LL-T19D1 TROUBLE SHOOTING
5 – 1
CHAPTER 5. TROUBLE SHOOTING
No power supply
Does LED turns on in green
when power switch is turned
on?
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
1) PC is turned off?
2) RGB/DVI cable is disconnected?
3) Synchronizing signal is output from RGB
cable?
Check whether the unit is in power save
mode (synchronizing signal is not input.).
Synchronizing signal is input to main PWB?
Replace RGB/DVI
cable with a new one.
LED turns on in orange?
Check power input system.
1) AC adapter
* Normal?
* Connected properly?
2) Blown out fuse?
3) Check +5V, 3.3V are output?
4) LED
* Check LED for breakage.
* Check the cable for disconnection.
Replace any defective unit.
[ 1) Power/inverter PWB, 2) Main PWB,
3) Switch PWB] with a new one.
Backlight turns ON?
Check for RGB/DVI cable
input signal.
Replace RGB/DVI cable.
Check each pin terminal.
Normal
Normal
Normal
Defective
Defective
*Check power/inverter PWB unit.
Note: Use caution when checking output
side because it has a high voltage.
Replace LCD module lamp with
a new one.
Replace power/inverter
PWB unit with a new one.
A

LL-T19D1 TROUBLE SHOOTING
5 – 2
A
Screen does not operate normally.
Check RGB/DVI cable. Defective Replace RGB/DVI cable
with a new one.
Check screen condition by changing display modes.
Operate the "ALL RESET" to check if screen condition changes.
(Press and hold MENU and c/MODE buttons while turning on power switch.)
Screen stays in black. Screen stays in white.
Screen jitters or on-screen
characters flicker.
Abnormal color
Check the following signals
1) Check if module control signal is output.
2) Is the power supply of IC turned ON?
3) Check if control signal is output of IC.
4) Check if LCD 12V is output normally.
Yes No
Yes No
Yes No
CLOCK and PHASE
can be adjusted? Does abnormal area move on
screen when BLACK LEVEL or
CONT is changed after H-POS
or V-POS is set?
Switch PWB defective
Main PWB defective. LCD panel defective.

LL-T19D1 CIRCUIT DIAGRAM
6 – 1
A B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A
1/7
CHAPTER 6. CIRCUIT DIAGRAM

LL-T19D1 CIRCUIT DIAGRAM
6 – 2
A B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A
2/7

LL-T19D1 CIRCUIT DIAGRAM
6 – 3
A B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A
3/7

LL-T19D1 CIRCUIT DIAGRAM
6 – 4
A B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A
4/7

LL-T19D1 CIRCUIT DIAGRAM
6 – 5
A B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A
5/7

LL-T19D1 CIRCUIT DIAGRAM
6 – 6
A B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A A
B
C D
87654321
12345678
D C
B A
6/7