Acer AL1922 User manual

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Acer AL1922
Service Guide
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Service Guide Version and Revision
No. Version Release Date Revision
1 1.0 Jan.07, 2005 Original release
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Copyright
Copyright 2005 LiteOn Technology Corp.
All rights reserved.
This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or
converted to any electronic machine readable form without prior written permission of LiteOn
Technology Corp.
ACER AL1922 Service Manual.
Printed in Taiwan.
Disclaimer
The information in this guide is subject to change without notice. Acer Incorporated makes no
representations or warranties, either expressed or implied, with respect to the contents hereof
and specifically disclaims any warranties of merchantability or fitness for any particular
purpose. Any Acer Incorporated software described in this manual is sold or licensed "as is".
Should the programs prove defective following their purchase, the buyer (and not Acer
Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing,
repair, and any incidental or consequential damages resulting from any defect in the software.
Acer is a registered trademark of Acer Corporation.
Intel is a registered trademark of Intel Corporation.
Pentium and Pentium II/III are trademarks of Intel Corporation.
Other brand and product names are trademarks and/or registered trademarks of their
respective holders.
Trademarks
LiteOn is a registered trademark of LiteOn Technology Corp.
All other trademarks are property of their respective owners.
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Conventions
The following conventions are used in this manual:
Screen messages Denotes actual messages that appear on screen.
NOTE Gives bits and pieces of additional information related to the
current topic.
WARNING Alerts you to any damage that might result from doing or not
doing specific actions.
CAUTION Gives precautionary measures to avoid possible hardware or
software problems.
IMPORTANT Reminds you to do specific actions relevant to the
accomplishment of procedures.
Preface
Before using this information and the product it supports, please read the following general
information.
1. This Service Guide provides you with all technical information relating to the BASIC
CONFIGURATION decided for Acer's "global" product offering. To better fit local market requirements
and enhance product competitiveness, your regional office MAY have decided to extend the
functionality of a machine (e.g.add-on card, modem, or extra memory capability). These
LOCALIZED FEATURES will NOT be covered in this generic service guide. In such cases,
please contact your regional offices or the responsible personnel/channel to provide you
with further technical details.
2. Please note WHEN ORDERING FRU PARTS, that you should check the most up-to-date
information available on your regional web or channel. If, for whatever reason, a part
number change is made, it will not be noted in the printed Service Guide. For
ACER-AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT
part number code to those given in the FRU list of this printed Service Guide. You MUST
use the list provided by your regional Acer office to order FRU parts for repair and service
of customer machines.
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Warning: (For FCC Certified Models)
Note: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy, and if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
4. Consult the dealer or an experienced radio/TV technician for help.
Notice:
1. The changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment.
2. Shielded interface cables and AC power cord, if any, must be used in order to comply with
the emission limits.
3. The manufacturer is not responsible for any radio or TV interference caused by
unauthorized modification to this equipment. It is the responsibility of the user to correct
such interference.
As an ENERGY STAR®Partner our company has determined that this product meets the
ENERGY STAR®guidelines for energy efficiency.
Warning:
To prevent fire or shock hazard, do not expose the monitor to rain or moisture. Dangerously
high voltages are present inside the monitor. Do not open the cabinet. Refer servicing to
qualified personnel only.
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Precautions
Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub,
swimming pool or in a wet basement.
Do not place the monitor on an unstable trolley, stand, or table. If the monitor falls, it can
injure a person and cause serious damage to the appliance. Use only a trolley or stand
recommended by the manufacturer or sold with the monitor. If you mount the monitor on a
wall or shelf, use a mounting kit approved by the manufacturer and follow the kit
instructions.
Slots and openings in the back and bottom of the cabinet are provided for ventilation. To
ensure reliable operation of the monitor and to protect it from overheating, be sure these
openings are not blocked or covered. Do not place the monitor on a bed, sofa, rug, or
similar surface. Do not place the monitor near or over a radiator or heat register. Do not
place the monitor in a bookcase or cabinet unless proper ventilation is provided.
The monitor should be operated only from the type of power source indicated on the label.
If you are not sure of the type of power supplied to your home, consult your dealer or local
power company.
The monitor is equipped with a three-pronged grounded plug, a plug with a third
(grounding) pin. This plug will fit only into a grounded power outlet as a safety feature. If
your outlet does not accommodate the three-wire plug, have an electrician install the
correct outlet, or use an adapter to ground the appliance safely. Do not defeat the safety
purpose of the grounded plug.
Unplug the unit during a lightning storm or when it will not be used for long periods of time.
This will protect the monitor from damage due to power surges.
Do not overload power strips and extension cords. Overloading can result in fire or electric
shock.
Never push any object into the slot on the monitor cabinet. It could short circuit parts
causing a fire or electric shock. Never spill liquids on the monitor.
Do not attempt to service the monitor yourself; opening or removing covers can expose
you to dangerous voltages and other hazards. Please refer all servicing to qualified service
personnel
To ensure satisfactory operation, use the monitor only with UL listed computers which have
appropriate configured receptacles marked between 100 - 240V AC, Min. 3.5A.
The wall socket shall be installed near the equipment and shall be easily accessible.
For use only with the attached power adapter (output 12V DC) which have UL, CSA listed
license
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Special Notes On LCD Monitors
The following symptoms are normal with LCD monitor and do not indicate a problem.
Notes
Due to the nature of the fluorescent light, the screen may flicker during initial use. Turn off
the Power Switch and then turn it on again to make sure the flicker disappears.
You may find slightly uneven brightness on the screen depending on the desktop pattern
you use.
The LCD screen has effective pixels of 99.99% or more. It may include blemishes of 0.01%
or less such as a missing pixel or a pixel lit all of the time.
Due to the nature of the LCD screen, an afterimage of the previous screen may remain
after switching the image, when the same image is displayed for hours. In this case, the
screen is recovered slowly by changing the image or turning off the Power Switch for
hours.
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Chapter 1 Monitor Features ……………………………………… 8
Induction ……………………………………… 8
Electrical Requirements ……………………………………… 9
LCD Monitor General Specification ……………………………………… 10
LCD Panel Specification ……………………………………… 11
Support Timing ……………………………………… 12
Block Diagram ……………………………………… 14
Main Board Diagram ……………………………………… 15
Software Flow chart ……………………………………… 16
Main Board Layout ……………………………………… 17
Front Bezel ……………………………………… 21
Rear Bezel ……………………………………… 22
Chapter2 OperatingInstructions
……………………………………… 23
External Controls ……………………………………… 23
Front Panel Controls ……………………………………… 24
Adjusting the picture ……………………………………… 25
Hot-Key Menu ……………………………………… 29
OSD Message ……………………………………… 29
LOGO ……………………………………… 30
Chapter 3 Machine Disassembly
……………………………………… 31
Chapter 4 Troubleshooting
……………………………………… 41
Chapter5 ConnectorInformation
……………………………………… 48
Chapter 6 FRU (Field Replacement Unit) List
……………………………………… 49
Exploded Diagram ……………………………………… 50
Chapter7 SchematicDiagram
……………………………………… 53
For SAMSUNG Panel ……………………………………… 53
Analog and Digital Input ……………………………………… 53
GM5321 ……………………………………… 54
LVDS ……………………………………… 55
Key Board Connector/DC Power ……………………………………… 56
Audio ……………………………………… 57
Power Board (adapter +inverter) ……………………………………… 58
For AU Panel ……………………………………… 61
Table Of Content
s
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Monitor Features
Introduction
Scope
This specification defines the requirements for the 19” MICRO-PROCESSOR based
Multi-mode supported high resolution color LCD monitor. This monitor can be directly
connected to general 15 pin D-sub VGA connector and 24 pin DVI connector. It also supports
VESA DPMS power management and plug & play function. There is a build-in stereo audio
amplifier with OSD control to drive a pair of speakers.
Description
The LCD monitor is designed with the latest LCD technology to provide a performance
oriented product with no radiation. This will alleviate the growing health concerns. It is also a
space saving design, allowing more desktop space, and comparing to the traditional CRT
monitor, it consumes less power and gets less weight in addition MTBF target is 50k hours or
more.
Chart of AL1922
19" Samsung
LTM190EX-L01
Panel
19” AU M190EN04 V5
D-SUB
Signal Interface DVI
Sync Type Separate / Compatible
Color Temp User Adjust Support
DDC DDC2B
Speaker 1W + 1W (Rated power)
Headphone Jack No
Microphone Jack No
USB Hub Not support
Tilt / Swivel Yes / No
Height Adjust Option
Chapter 1
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Electrical Requirements
Standard Test Conditions
All tests shall be performed under the following conditions, unless otherwise specified.
Ambient light :225 lux
Viewing distance :40 cm in front of LCD panel
Warm up time
All specifications :30 minutes
Fully functional :5 seconds
Measuring equipment :Chroma 7120 signal generator or equivalent, directly
Connected to the monitor under test.
Minolta CA100 photometer, or equivalent
Control settings
User brightness control :Maximum (unless otherwise specified)
User contrast control : Typical (unless otherwise specified)
User red/white balance,
Green/white balance and
Blue/white balance control : In the center (unless otherwise specified)
Power input :90Vac or 240Vac
Ambient temperature :20+5℃
Analog input mode :1280 x1024 /75 Hz
Measurement systems
The units of measure stated in this document are listed below:
1 gamma = 1 nano tesla
1 tesla = 10,000 gauss
cm = in x 2.54
lb = kg x 2.2
degrees F = [°C x 1.8] + 32
degrees C = [°F - 32]/1.8
u' = 4x/(-2x + 12y + 3)
v' = 9y/(-2x + 12y + 3)
x = (27u'/4)/[(9u'/2) - 12v' + 9]
y = (3v')/[(9u'/2) - 12v' + 9]
nits = cd/(m2) = Ft-L x 3.426
lux = foot-candle x 10.76
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LCD Monitor General Specification
Panel type : 19 “ active matrix color TFT LCD
SAMSUNG LTM190EX-L01
AU M190EN04 V5
Display size :376.32mm (H) ×301.056mm(V)
Display mode :VGA 640 ×480 (60//72/75 Hz)
SVGA 800 ×600 (56/60/72/75 Hz)
XGA 1024 ×768 (60/70/75 Hz)
SXGA 1280 ×1024 (60//75 Hz)
Pixel pitch :0.294mm(H) ×0.294mm(V)
Display dot :1280 x (RGB) ×1024
Pixel clock :135.0MHz
Contrast ratio :700:1(For SAMSUNG Panel)/550:1(For AU Panel)
Brightness :300 cd/m2
Response time (Tr/Tf) :8ms (Tr=1.7ms, Tf=6.3ms)
Display color :16.7M(RGB 8 bit Data)
Viewing angle :H:150 / V:135 (typ) (For SAMSUNG Panel)
H:140 / V:135 (typ) (For AU Panel)
Pc interface :RGB Analog Interface
Digital interface (Only Dual-Input Model)
Signal connector :D-Sub 15pin
DVI-D 24pin (Only Dual-Input Model)
Interface frequency :Horizontal Frequency 30KHz ----80KHz
Vertical Frequency 55Hz ------75Hz
Plug & play :VESA DDC1/2B
Power Input voltage :50/60HZ, 100 VAC to 240VAC ±10%
Total output power :60 Watt max.
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LCD Panel Specification
LCD Panel Model (SAMSUNG LTM190EX-L01)
 Display Type active matrix color TFT LCD
 Resolution 1280x1024 pixels
 Display Dot 1280x (RGB) x 1024
 Display Area 376.32mm(H) x 301.056mm(V)
 Pixel Pitch 0.294mm(H) x 0.294mm(V)
 Display Color 16.7M (true)
 Lamp Frequency 80kHz
 LampCurrent 7.0mArms(typ)
 Weight 2750g (typ)
 Optical Specifications
IL= 6.5mArms Ta= 25 ±2°C VDD =5V FV= 60Hz FDCLK = 54MHz
ITEM Symbol Condition MIN. TYP. MAX. UNIT
Contrast Ratio
(Center of screen) CR 500 700 -
Rising TR-1.7 -
Response
Time at Ta Falling TF-6.3 -msec
Luminance of white
(Center of screen) YL250 300 -cd/m2
RX0.634
Red RY0.354
GX0.304
Green GY0.581
BX0.143
Blue BY0.102
WX0.310
Color
Chromaticity
(CIE)
White WY
θ=0,
φ=0
Normal
Viewing
Angle
TYP.
-0.03
0.330
TYP.
+0.03
θL-80 -
Hori. θR70 85 -
φH70 85 -
Viewing
Angle Vert. φL
CR≥10
70 85 -
Degrees
Brightness Uniformity BUNI 70 85 80 %
Flicker F --25 %
Luminance
Uniformity(TCO99) LR --1.7
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Supported Timing
VESA MODES
Horizontal Vertical
Mode Resolution
Nominal
Frequency
+/- 0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
640x480@60Hz 31.469 N 59.940 N 25.175
640x480@72Hz 37.861 N 72.809 N 31.500
VGA
640x480@75Hz 37.500 N 75.00 N 31.500
800x600@56Hz 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 37.879 P 60.317 P 40.000
800x600@72Hz 48.077 P 72.188 P 50.000
SVGA
800x600@75Hz 46.875 P 75.000 P 49.500
1024x768@60Hz 48.363 N 60.004 N 65.000
1024x768@70Hz 56.476 N 70.069 N 75.000
XGA
1024x768@75Hz 60.023 P 75.029 P 78.750
1152x864@75Hz 67.5khz P 75 P 108.000
1280x1024@60Hz 63.981 P 60.020 P 108.000
SXGA 1280x1024@75Hz 79.976 P 75.025 P 135.000
IBM MODES
Horizontal Vertical
DOS 720x400@70Hz 31.469 N 70.087 P 28.322
DOS 640x350@70Hz 31.469 P 70.087 N 25.175
XGA 1024x768@72Hz 57.515 P 72.1 P 75.000
MAC MODES
VGA 640x480@67Hz 35.000 N 66.667 N 30.240
SVGA
832x624@75Hz 49.725 N 74.551 N 57.2832
1024x768@60Hz 48.780 N 60.001 N 64.000XGA
1024x768@75Hz 60.241 N 74.927 N 80.000
ٛ.
Support Modes
There will be 20 total support modes to accommodate the above mode and other video
modes within the frequency range of the monitor.
85Hz refresh rate Support
Monitor should display 85Hz refresh rate mode as emergency mode.
Monitor should display “ Out of Range” warning menu at this mode.
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Video Input Connector
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. Red 9. +5V
2. Green 10. Logic Ground
3. Blue 11. Monitor Ground
4. Monitor Ground 12. DDC-Serial Data
5. DDC-Return 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
VGA Connector layout
15
610
11 15
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1. TMDS Data 2- 13. NC
2. TMDS Data 2+ 14. +5V Power
3. TMDS Data 2/4 Shied 15. Ground (for +5V)
4. NC 16. Hot Plug Detect
5. NC 17. TMDS Data 0+
6. DDC Clock 18. TMDS Data 0-
7. DDC Data 19. TMDS Data 0/5 Shield
8. Analog Vertical Sync 20. NC
9. TMDS Data 1- 21. NC
10. TMDS Data 1+ 22. TMDS Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock+
12. NC 24. TMDS Clock-
DVI Connector layout
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Monitor Block Diagram
The LCD MONITOR will contain a main board, a power board (include adapter and inverter),
keypad board and audio board which house the flat panel control logic, brightness control
logic and DDC.
The Inverter board will drive the backlight of panel.
The adapter will provide the 12V DC-power to inverter/power board and main board..
Video signal, DDC
Power board
(Include: adapter, inverter)
Flat Panel and
CCFL backlight
Main Board
Keyboard
RS232 Connector For
white balance adjustment
in factory mode
HOST Computer
CCFL Drive.
AC-IN
100V-240V
Audio board
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Main Board Diagram
LCD Interface
Scaler TSU16AK
(Include: ADC, OSD etc)
MCU
OSD Control
Interface (Keypad)
DVI
Connector
D-SUB
Connector
EEPROM
24C02
EEPROM
24C02
Crystal
14.318MHZ
EEPROM
24C16
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Software Flow Chart
1) MCU initialize.
2) Is the eeprom blank?
3) Program the eeprom by default values.
4) Get the PWM value of brightness from
eeprom. Check the pin PANEL1 and PANEL2
to tell which panel to get with it.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Saving the power key status into eeprom.
Turn on the LED and set it to green color.
Scalarinitializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog and digital port, are there
any signals coming?
13) Does the scalar send out a interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog or
digitalport?
16) Display " No Input Signal " message. And go
into standby mode after the message disappear.
17) Program the scalar to be able to show the coming
mode.
18) ProcesstheOSDdisplay.
19) Read the keyboard. Is the power key pressed?
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18
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Main Board Layout
Label Component
U301 M24C02-WMN6T SMT
U302 M24C02-WMN6T SMT
U601 56L1125137AZ4
X401 CRYSTAL 14.318MHz
U401 SCALER IC TSU16AK
X601 20MHZ
U201 AZ1117D-1.8
U202 AIC1084-33CM
U603 MAX810STR SOT-23
U602 M24C16-WMN6T/W SO-8
CN301 D-USB 15PIN
CN302 DVI 24PIN
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The step between front bezel and back cover shall be within specification.
Top and Bottom Left and Right
Back cover & Bezel concavity Back cover & Bezel concavity
0.8mm ≤A ≤1.3mm 0.8mm ≤A ≤1.3 mm
Back Cover & Hinge Cover concavity
0mm ≤B ≤0.5mm
B
Base & Neck concavity
0mm ≤C ≤0.6mm
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Top and Bottom Left and Right
Backcover&Bezelstep Backcover&Bezelstep
0mm ≤D ≤0.8mm 0mm≤D ≤0.8 mm
LCD Horizontally
The angle between front bezel and LCD unit in bottom side should not large than 1.0mm.
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