Sharp LL-T155A (serv.man2) Service Manual ▷ View online
CHAPTER1. OTLINE OF HE PRODUCT, NOMENCLATURE AND FUNCTIONS
[1] Features
·
38 cm [15 type] 1024-dots x RGB x 768-line high-resolution TFT
color LCD panel
color LCD panel
·
200 cd/m
2
high-luminance design
·
Connectable to analog RGB output (for CRT)
Multi display mode function that supports resolutions from 640-dot
x RGB x 400-line to up to 1024-dot x RGB x 768-line
x RGB x 400-line to up to 1024-dot x RGB x 768-line
In modes lower than 800 x 600 dots, it is possible to enlarge the
screen that offers smooth and excellent visibility.
Supports VESA specification, PC9800 series, Power Macintosh.
Supports VESA specification, PC9800 series, Power Macintosh.
·
Up to 16 million colors can be displayed.
·
Automatic screen adjustment
·
The display timing and RGB gain can be more finely adjusted due
to the OSD guide function, in addition to the automatic adjustment
function.
to the OSD guide function, in addition to the automatic adjustment
function.
·
Power management function
·
Supports Plug&Play (VESA:DDC1, DDC2B specifications)
[2] Safe servicing and safe inspection,
<When servicing or inspecting,
observe the safety instructions.>
observe the safety instructions.>
1. Observe the cautions.
Locations which require a special caution carry safety instructions
using labels and stamps on the cabinet, chassis and components.
When servicing, observe the instructions on such labels and
stamps as well as those in the Instruction manual.
stamps as well as those in the Instruction manual.
2. Exercise care not to get an electrical shock
accident.
Some parts have a high voltage inside the unit. Use caution when
handling them while they are energized.
3. Use specified parts.
The component parts of this unit have safety characteristics such
as flame resistance and dielectric strength. Use replacement parts
which have the same characteristics as those of the components
which have the same characteristics as those of the components
parts used for this unit. In particular, component parts marked with
in the circuit drawing parts list are important for maintaining the
safety of the product. Make sure to use specified replacement
parts.
4. Reinstall component parts in their original
locations and return wires which have been
rerouted for servicing purposes to their original
positions.
rerouted for servicing purposes to their original
positions.
Some component parts use insulating materials such as tubes or
tape for safety purposes, or are mounted, a bit floated, on the
printed wiring board.
printed wiring board.
When rerouting inside wiring or clamping the wires, use caution not
to bring the wires too close to heating or high-voltage parts.
Make sure to return inside wiring to their original locations.
Make sure to return inside wiring to their original locations.
5. Check for safety after servicing.
After finishing servicing, check whether the screws, parts, wires
which have been removed for servicing are reinstalled properly. In
addition, check to see if you have not deteriorated parts around the
part you serviced, and also check for insulation between each of
part you serviced, and also check for insulation between each of
the attachment plug terminals and the external metal section.
[3] Specifications
1. General specifications
Name of the product: LCD color monitor
Model: LL-T155A, LL-T155B
Item
Specifications
LCD display device
38 cm (15 type) TFT color LCD
Picture element pitch
0.297 mm (horizontal) x 0.297 mm (vertical)
Display area
304.1 mm (horizontal) x 228.1 mm (vertical)
Number of picture
elements
elements
1024 x RGB x 768 dots
Display color
approx. 16 million colors (max.)
Input vide signal
Analog RGB (0.7 Vp-p/75
W
)
Input synchronizing
signal
signal
Horizontal synchronizing signal TTL level
(positive, negative), vertical synchronizing
signal TTL level (positive, negative)
(positive, negative), vertical synchronizing
signal TTL level (positive, negative)
Input terminal
15-pin mini D-sub connector
USB
USB cable relay connector
Plug&Play
VESA DDC1/DDC2B
Power management
function
function
Compatible with VESA DPMS
Working temperature
5 ~ 35°C
Power supply
100 V AC 50/60 Hz
Power consumption
approx. 22 W/ about 3 W in power save
mode
mode
Outer dimensions
about 385 mm (width) x 203 mm (depth) x
373 mm (height)
373 mm (height)
Weight
approx. 6 kg
Accessories
AC power supply cord (1), Instruction
manual (1), warranty (1), adjustment disk
(1), USB cable (1)
manual (1), warranty (1), adjustment disk
(1), USB cable (1)
·
Specifications and a part of the appearance are subject to change
without notice.
without notice.
2. Technical specifications
Item
MIN
TYP
MAX
Unit
Power supply voltage
AC
90
100
110
V
Working temperature range
+5
—
+35
°C
Storing temperature range
-20
—
+60
°C
Humidity range
20
—
85
%RH
Visual angle range
Vertical (CR 5)
+20 ~ -50
+35 ~ -60
—
Temperature
Horizontal (CR 5)
50
55
—
Temperature
Contrast ratio(CR)
(
q
= 0°)
150
—
—
—
Response speed
Leading (
t
r)
—
10
25
ms
Trailing (
t
d)
—
35
50
ms
Screen white chromaticity
(X)
0.283
0.313
0.343
—
(Y)
0.299
0.329
0.359
—
White surface luminance
(Y
L
)
150
200
—
cd/m
2
Module model number
LQ150X1DH10
Specifications and a part of the appearance are subject to change without notice.
[Power management]
This unit supports VESA*
1
DPMS*
2
.
To use the power management function of this unit, the video card and
the computer must be compatible with the DPMS specifications.
*1 VESA: Video Electronics Standards Association
*2 DPMS: Display Power Management Signaling
DPMS mode
Screen condition
Power consumption
Horizontal synchronization
Vertical synchronization
ONSTATE
Displayed state
approx. 22 W
Yes
Yes
STANDBY
No display
approx. 3 W
No
Yes
SUSPEND
Yes
No
OFFSTATE
No
No
[DDC*
3
]
This unit supports VESA’s DDC specifications
DDC means a signal specification that offers Plug&Play function to the
monitor and the personal computer.
Information about resolution and others are communicated between
the monitor and the personal computer.
This function is available when the personal computer supports DDC.
There are some DDC types depending on different communication
methods.
methods.
This unit supports DDC1 and .DDC2B.
*3 DDC: Display Data Channel
[4] Nomenclature and functions
[Front part]
Power-on lamp
Light comes on when the power supply is turned on.
The light is green in the normal display mode and orange in the
power save mode.
and buttons
1) Display the adjustment menus.
2) Switch over the adjustment menus (MAIN MANU and SUB
MENU)
3) Change the setting of the adjustment option selected.
DOWN and UP buttons
1) Display the adjustment menus
2) Select adjustment items
[Rear part]
Power supply connector
Make sure to use the AV power supply cord supplied with the unit.
Power supply switch
( | ) : The power is turned on. (The power-on lamp comes on.)
( ) : The power is turned off.
Signal cable
This cable is used to connect the monitor to the analog RGB output
connector of the computer.
USB DOWN connector
This is sued to connect the monitor to USB devices.
USB UP connector
This is used to connect the monitor to a computer.
CHAPTER2. REPLACING LAMPS
(Removing LCD module)
(Removing LCD module)
1. Replacing lamps
·
After removing the LCD module from the unit according to 2. Re-
moving the LCD module, replace the lamp units.
moving the LCD module, replace the lamp units.
·
Replace the lamp units using the following replacement procedure,
referring to Fig.1 (enlarged view) and Fig. 2 (overall view).
referring to Fig.1 (enlarged view) and Fig. 2 (overall view).
·
There are two lamp units at the top and bottom of the monitor.
·
Wear finger sacks when doing this work, not to contaminate or
damage the LCD panel. Use caution prevent the entrance of dirt
or dust into the module.
damage the LCD panel. Use caution prevent the entrance of dirt
or dust into the module.
[Replacement procedure]
Turn the module over and remove the screws A in Figs. 1. (1 screw
for each unit). Put a finger on the concave B and remove the lamp
unit in a straight line.
unit in a straight line.
·
Use caution not to apply undue force on the lamp.
Replace the lamp unit with a new one.
Reinstall in the reverse order of disassembly.
·
Tighten the screw and make sure the lamp unit won’t move.
1
2
3
1
3
2
1
5
4
B
Drawing
direction
direction
Screw A
Fluorescent
lamp lead wire
lamp lead wire
Fig. 1
2. Removing LCD module
Procedure
·
Disassembly
1. Remove the 4 screws in
and remove the display mask (front
cabinet).
·
Use caution not to break the latches in
when removing the
front cabinet.
2. Remove the 4 screws in
and remove the module.
·
Use caution not to drop the LCD module.
3. Remove the 2 screws in
and remove the LCD cable connector
from the module.
·
Reassembly
Reassemble the LCD module using the steps from 1 to 3 in re-
verse.
·
Use caution not to get the cables caught in the cabinet when
reassembling.
reassembling.
1
2
3
4
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