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Acer AL1922
Service Guide
0
Service Guide Version and Revision
No. Version Release Date Revision
1 1.0 Jan.07, 2005 Original release
1
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.
2
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.
3
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 STARŪ Partner our company has determined that this product meets the
ENERGY STARŪ 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.
4
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
5
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.
6
Table Of Contents
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
Chapter 2 Operating Instructions ............................................. 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
Chapter 5 Connector Information ............................................. 48
Chapter 6 FRU (Field Replacement Unit) List ............................................. 49
Exploded Diagram ............................................. 50
Chapter 7 Schematic Diagram ............................................. 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
7
Chapter 1
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
Panel LTM190EX-L01
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
8
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
9
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.
10
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
Lamp Current 7.0 mArms (typ)
Weight 2750g (typ)
Optical Specifications
IL = 6.5mArms Ta = 25 2C VDD = 5V FV = 60Hz FDCLK = 54MHz
Symbol Condition MIN. TYP. MAX. UNIT
ITEM
Contrast Ratio
CR 500 700 -
(Center of screen)
Response Rising TR - 1.7 -
msec
Time at Ta Falling TF - 6.3 -
Luminance of white
YL =0, 250 300 - cd/m2
(Center of screen)
=0
RX 0.634
Red Normal
RY 0.354
Viewing
GX 0.304
Color Green Angle
GY TYP. 0.581 TYP.
Chromaticity
BX -0.03 0.143 +0.03
(CIE) Blue
BY 0.102
WX 0.310
White
WY 0.330
L - 80 -
Hori.
Viewing R 70 85 -
CR 10 Degrees
Angle H 70 85 -
Vert.
L 70 85 -
Brightness Uniformity BUNI 70 85 80 %
Flicker F - - 25 %
Luminance
LR - - 1.7
Uniformity(TCO99)
11
Supported Timing
VESA MODES
Horizontal Vertical
Nominal
Nominal Nominal
Sync Sync Pixel
Mode Resolution Frequency Freq.
Polarity Polarity Clock
+/- 0.5kHz +/- 1 Hz
(MHz)
640x480@60Hz 31.469 N 59.940 N 25.175
VGA 640x480@72Hz 37.861 N 72.809 N 31.500
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
SVGA
800x600@72Hz 48.077 P 72.188 P 50.000
800x600@75Hz 46.875 P 75.000 P 49.500
1024x768@60Hz 48.363 N 60.004 N 65.000
XGA 1024x768@70Hz 56.476 N 70.069 N 75.000
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
XGA 1024x768@60Hz 48.780 N 60.001 N 64.000
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.
12
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
1 5
6 10
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
13
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..
CCFL Drive. Flat Panel and
CCFL backlight
Power board Main Board
RS232 Connector For
(Include: adapter, inverter)
white balance adjustment
in factory mode
Audio board Keyboard
AC-IN
100V-240V HOST Computer Video signal, DDC
14
Main Board Diagram
LCD Interface
EEPROM
24C16
Scaler TSU16AK
Crystal
(Include: ADC, OSD etc)
14.318MHZ
MCU
DVI D-SUB
OSD Control Connector Connector
Interface (Keypad)
EEPROM EEPROM
24C02 24C02
15
Software Flow Chart
1) MCU initialize.
2) Is the eeprom blank?
1 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?
2 Y 3 6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
N 8) Enter factory mode.
9) Saving the power key status into eeprom.
4 Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog and digital port, are there
5 N any signals coming?
13) Does the scalar send out a interrupt request?
Y 14) Wake up the scalar.
15) Are there any signals coming from analog or
digital port?
6 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) Process the OSD display.
7 N 8 19) Read the keyboard. Is the power key pressed?
Y
9
10 N 11
Y
N 12 13 N
Y Y
14 15 N 16
Y
17
18 N 19
Y
16
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
17
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 1.3 mm 0.8mm A 1.3 mm
Back Cover & Hinge Cover concavity Base & Neck concavity
0mm B 0.5mm 0mm C 0.6mm
B
18
Top and Bottom Left and Right
Back cover & Bezel step Back cover & Bezel step
0mm D 0.8 mm 0mm D 0.8 mm
LCD Horizontally
The angle between front bezel and LCD unit in bottom side should not large than 1.0mm.
19
The distance of the LCD display unit from left side to right should not large than 4.0mm.
Tilt Base Rotation
Tilt up 15 2 / down 5 2
Plastic Material
For TCO99
Front Bezel ABS 94HB
Back Cover ABS 94HB
The Others ABS 94HB
For MPRII
Front Bezel ABS 94HB
Back Cover ABS 94HB
The Others ABS 94HB
GAP Spec.
Gap between panel with bezel is 0 mm < gap < 1.2 mm
20
Front Bezel
Item Description
1 Volume
2 Volume
3 POWER KEY
4 MENU/ENTER
5 Auto Adjust Key/Exit
21
Rear Bezel
Item Description
1 D-SUB CABLE
2 DVI CABLE
3 AUDIO CABLE
4 AC POWER CORD
22
Chapter 2
Operating Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at
front panel of the monitor. By changing these settings, the picture can be adjusted to your
personal preferences.
· The power cord should be connected.
· Connect the video cable from the monitor to the video card.
· Press the power button to turn on the monitor position. The power indicator will light up.
External Controls
Item Description
1 Volume
2 Volume
3 POWER KEY
4 MENU/ENTER
5 Auto Adjust Key/Exit
23
Front Panel Control
· Power Button:
Press this button to turn the monitor ON or OFF.
· Menu / Enter :
Activate OSD menu when OSD is OFF or activate/de-activate adjustment function when
OSD is ON or Exit OSD menu when in Volume Adjust OSD status.
· Activates the volume control when the OSD is OFF or navigate through adjustment icons
when OSD is ON or adjust a function when function is activated.
· >/Volume:
Activates the volume control when the OSD is OFF or navigate through adjustment icons
when OSD is ON or adjust a function when function is activated.
· Auto Adjust button / Exit:
1. When OSD menu is in active status, this button will act as EXIT-KEY(EXIT OSD menu).
2. When OSD menu is in off status, press this button for 2 seconds to activate the Auto
Adjustment function.
The Auto Adjustment function is used to set the HPos, VPos, Clock and Focus.
· Power Indicator:
Blue -- Power On mode.
Orange -- Power saving
Light blue -- Off mode
NOTES
Notes
· Do not install the monitor in a location near heat sources such as radiators or air ducts, or
in a place subject to direct sunlight, or excessive dust or mechanical vibration or shock.
· Save the original shipping carton and packing materials, as they will come in handy if you
ever have to ship your monitor.
· For maximum protection, repackage your monitor as it was originally packed at the factory.
· To keep the monitor looking new, periodically clean it with a soft cloth. Stubborn stains may
be removed with a cloth lightly dampened with a mild detergent solution. Never use strong
solvents such as thinner, benzene, or abrasive cleaners, since these will damage the
cabinet. As a safety precaution, always unplug the monitor before cleaning it.
24
Adjusting the Picture
a. How to Adjust a Setting
1. Press the MENU-button to activate the OSD window.
2. Press to select the desired function.
3. Press the MENU-button to select the function that you want to adjust.
4. Press < or >to change the settings of the current function.
5. To exit and save, select the exit function. If you want to adjust any other function, repeat
steps 2-4.
I. Analog-Only Model
25
II. Dual-Input Model, Analog Signal Input
III. Dual-Input Model, Digital Signal Input
26
b. The Description For Control Function
Main Sub
Sub Menu
Menu Menu Description
Item
Icon Icon
Contrast Contrast from Digital-register.
Brightness Backlight Adjustment
Adjust Picture Phase to reduce Horizontal-Line
Focus
noise
Clock Adjust picture Clock to reduce Vertical-Line noise.
H. Position Adjust the horizontal position of the picture.
V. Position Adjust the vertical position of the picture.
Warm N/A Recall Warm Color Temperature from EEPROM.
Cool N/A Recall Cool Color Temperature from EEPROM.
User / Red Red Gain from Digital-register.
User/ Green Green Gain Digital-register.
User / Blue Blue Gain from Digital-register.
English N/A Set OSD display language to English.
N/A Set OSD display language to Traditional Chinese.
Deutsch N/A Set OSD display language to German.
Franįais N/A Set OSD display language to French.
Espaņol N/A Set OSD display language to Spain.
Italiano N/A Set OSD display language to Italian.
N/A Set OSD display language to Simplified Chinese.
N/A Set OSD display language to Japanese.
H. Position Adjust the horizontal position of the OSD.
V. Position Adjust the vertical position of the OSD.
OSD Timeout Adjust the OSD timeout.
27
Main Sub
Sub Menu
Menu Menu Description
Item
Icon Icon
Auto Config Auto Adjust the H/V Position, Focus and Clock of
N/A
picture.
(Analog-O
nly Model)
Analog
N/A Select input signal from analog (D-Sub)
(Dual-Inpu Digital N/A Select input signal from digital (DVI)
t Model)
Show the resolution, H/V frequency and input port
Information N/A
of current iput timing.
Clear each old status of Auto-configuration and set
Reset N/A
the color temperature to Cool.
Exit N/A Exit OSD
28
Hot-Key Menu
a. Outline
b. The Description For Hot-Key Function
Item Operation Icon Description
When the OSD is closed, press
Volume of Audio adjustment. The
Volume Left or Right button will be
Audio will be Mute when volume=0
Volume Hot-Key Function
OSD Message
a. Outline
b. The Description For OSD Message
Item Description
1.) When Analog signal input, if User Press Hot-Key "Auto", will show this
Auto Config
message, and the monitor do the auto config function.
Please Wait
2.) When Digital signal input, without this OSD Message.
Input Not When the Hsync Frequency, Vsync Frequency or Resolution is out of the
Supported monitor support range, will show this message. This message will be flying.
1.) Analog-Only Model: When the video cable is not connected, will show this
Cable Not
message. This message will be flying.
Connected
2.) Dual-Input Model: Dual-Input Model without this OSD Message.
1.) Analog-Only Model: When the video cable is connected, but there is no
active signal input, will show this message, then enter power saving.
No Signal 2.) Dual-Input Model: When the video cable is not connected, or the video cable
is connected but there is no active signal input, will show this message, then
enter power saving.
29
Logo
When the monitor is power on, the LOGO will be showed in the center, and disappear slowly.
How To Optimize The DOS-Mode
Plug And Play
Plug & Play DDC1/2B Feature
This monitor is equipped with VESA DDC1/2B capabilities according to the VESA DDC
STANDARD. It allows the monitor to inform the host system of its identity and, depending on
the level of DDC used, communicate additional information about its display capabilities. The
communication channel is defined in two levels, DDC1 and DDC2B.
The DDC1 is a unidirectional data channel from the display to the host that continuously
transmits EDID information. The DDC2B is a bidirectional data channel based on the IēC
protocol. The host can request EDID information over the DDC2B channel.
This monitor will appear to be non-functional if there is no video input signal. In order
for this monitor to operate properly, there must be a video input signal.
This monitor meets the Green monitor standards as set by the Video Electronics Standards
Association (VESA) and/or the United States Environmental Protection Agency (EPA) and
The Swedish Confederation Employees (NUTEK). This feature is designed to conserve
electrical energy by reducing power consumption when there is no video-input signal present.
When there is no video input signal this monitor, following a time-out period, will automatically
switch to an OFF mode. This reduces the monitor's internal power supply consumption. After
the video input signal is restored, full power is restored and the display is automatically
redrawn. The appearance is similar to a "Screen Saver" feature except the display is
completely off. The display is restored by pressing a key on the keyboard, or clicking the
mouse.
Using The Right Power Cord
The accessory power cord for the Northern American region is the wallet plug with NEMA
5-15 style and is UL listed and CSA labeled. The voltage rating for the power cord shall be
125 volts AC.
Supplied with units intended for connection to power outlet of personal computer: Please use
a cord set consisting of a minimum No. 18 AWG, type SJT or SVT three conductors flexible
cord. One end terminates with a grounding type attachment plug, rated 10A, 250V, CEE-22
male configuration. The other end terminates with a molded-on type connector body, rated
10A, 250V, having standard CEE-22 female configuration.
Please note that power supply cord needs to use VDE 0602, 0625, 0821 approval power cord
in European counties.
30
Chapter 3
Machine Disassembly
This chapter contains step-by-step procedures on how to assemble the monitor for
maintenance.
Disassembly Procedure
Disassemble the base
1. Remove hinge cover. (Fig 1)
2. Remove four screws to release stand base. (Fig 2)
Fig 1
Fig2
31
Disassemble the front cover
1. Remove nine screws to release front bezel. (Fig 3)
2. Remove connector wire with keyboard and main board. (Fig 4)
3. Remove two screws to release keyboard. (Fig 5)
4. Remove connector wire with keyboard and speakers. (Fig 6)
6. Remove four screws to release speakers (right and left). (Fig 7)
Fig 3
32
Fig 4
Fig 5
33
Fig6
Fig 7
34
Disassemble the rear bezel
Disassemble the shield
1. Remove two screws to release the shield. (Fig 8)
2. Remove the shield as arrow direction.
Fig8
35
Disassemble the audio board
1. Remove two screws to release audio board. (Fig 9)
2. Remove connector wire with audio board and power board. (Fig 10)
Fig9
Fig10
36
Disassemble the main board
1. Remove three screws to release main board. (Fig 11)
2. Remove connector wire with main board and panel. (Fig 12)
3. Remove connector wire with main board and power board. (Fig 13)
Fig11
Fig12
37
Fig13
38
Disassemble the power board
1.Remove five screws to release power board. (Fig 14)
2. Remove connector wire with power board and panel. (Fig 15)
Fig14
Fig15
39
Disassemble the panel
1. Remove four screws (right and left) to release metal frame. (Fig 16)
Fig16
40
Chapter 4
Troubleshooting
This chapter provides troubleshooting information for the AL1922:
1. No power
No power
Press power key and look
if the picture is normal
NG
Please reinsert and make sure
the AC of 100-240 is normal
NG Reinsert or check
OK the power section
Measure U701 PIN2=1.8V
U702 PIN2=3.3V
NG Measure CN701 PIN5/6=12V?
OK
Measure CN701 PIN9/10=5V?
X401 oscillate waveforms
are normal
NG
Check power section
OK
Replace U701, U702
OK
Replace U401
NG
Replace X401
41
2. No picture (LED is orange)
No picture
Measure U701 PIN2=1.8V
U702 PIN2=3.3V
OK NG Replace U701, U702
X401 oscillate waveforms
are normal
OK NG Replace X401
Check if the sync signal from
computer is output and video
cable is connected normally
NG Input the sync signal of
computer, or change the
OK cable
Replace U401
42
3. Panel Power Circuit
Measure Q402 base
is high level?
OK NG
Measure U701 PIN2=1.8V
U702 PIN2=3.3V
Check Q402 and Q401 are
NG Replace U701, U702
broken or CN401 solder? OK
X401 oscillate waveforms
NG are normal
Check Correspondent
component.
OK
NG
OK Replace X401
Replace PANEL
Replace U401
43
4. Keypad Board
OSD is unstable or not working
NG
Is Keypad board connecting normally Connect Keypad Board
OK
NG
Is Button Switch normally Replace Button Switch
OK
NG
Is Keypad board normally Replace Keypad Board
OK
Check main board
44
5. PWPC
No Power
No power
Check AC line volt 110V or 220V
NG
OK Check AC line
Check the voltage of C905(+)
NG
OK Check F901, bridge rectified circuit
Check start voltage for the pin3 of IC901
NG
OK Check R906, R907,IC901
Check the auxiliary voltage is between 10V-16V
OK NG Check IC901,T901
Check ZD901, D903
Check D910, D911, IC902
45
No Backlight
Check C201 (+) =12V
NG Change F902
OK
Check D201/Q209/Q210/
D202/Q211/Q212
Check ON/OFF signal
NG
Check Interface board
OK
Check U201 pin9=12V ?
NG
Change Q201 or Q202
OK
Check the pin1 of U201 have saw tooth wave
NG
Change U201
OK
Check D201(-), D202(-) have the output of square wave at short time.
NG
CheckQ205/Q207/Q203/Q201or
OK /Q206/Q208/Q204/D202
Check the resonant wave of pin2 & pin5 for PT201/ PT202
NG
OK Check Q209/Q210/C213 or Q211/Q212/C214
Check the output of PT201/PT202
NG
Change PT201/PT202
OK
Check connecter & lamp
46
6.No Audio
Mute and volume setting is ok?
NG
Reset mute and
OK volume
Check power supply of U201 is 12?
NG
Check connecting is ok?
OK
NG
Check input signal of U201is ok? Reconnect
NG
Check correspondent
OK component
Replace U201
NG
Replace speaker
47
Chapter 5
Connector Information
The following figure shows the connector locations on the monitor board:
1 5
6 10
11 15
15 Pin Color Display Signal Cable (D-sub)
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
24 Pin Color Display Signal Cable (DVI)
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. TMDS Data2- 13. TMDS Data3+
2. TMDS Data2+ 14. +5V Power
3. TMDS Data 2/4 Shield 15. Ground
4. TMDS Data4- 16. Hot Plug Detect
5. TMDS Data4+ 17. TMDS Data0-
6. DDC Clock 18. TMDS Data0+
7. DDC Data 19. TMDS Data 0/5 Shield
8. Analogue Vertical Sync 20. TMDS Data5-
9. TMDS Data1- 21. TMDS Data5+
10. TMDS Data1+ 22. DDC Clock Shield
11. TMDS Data 1/3 Shield 23. DDC Clock+
12. TMDS Data3- 24. DDC Clock-
48
Chapter 6
FRU (Field Replaceable Unit) List
This chapter gives you the FRU (Field Replaceable Unit) listing in global configurations of
AL1922.Refer to this chapter whenever ordering for parts to repair or for RMA (Return
Merchandise Authorization).
NOTE: Please note WHEN ORDERING FRU PARTS, that you should check the most
up-to-date information available on your regional web or channel
(http://aicsl.acer.com.tw/spl/). For whatever reasons 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 from those
given in the FRU list of this printed Service Guide. You MUST use the local FRU list
provided by your regional Acer office to order FRU parts for repair and service of
customer machines.
NOTE: To scrap or to return the defective parts, you should follow the local government
ordinance or regulations on how to dispose it properly, or follow the rules set by your
regional Acer office on how to return it.
49
Exploded Diagram (Model: AL1922)
50
Part List
Item Picture Description Part No.
1 33L4744 GD L/33L4743
Hinge cover
GD L
2
Stand base 34L1337 GD B
3 Front cover 34L1335AGD B
4 Rear cover 34L1336AGD 2B
5 Shield 85L 666 1
Metal frame
6 15L8021 5
7 Panel 750LLS90EX1
8 Audio board AUPC780AE
51
Power board
9 PWPC1942SEA2
10 Main board CBPC980KSVAF
11 Key board KEPC980KA8
78L 332 1 L/78L 332
12
Speakers 1 R
52
Chapter 7
Schematic Diagram
1. For Samsung panel
Analog and Digital Input
CN101
26 1 RX2-IN R137 10 1/16W
A_GND T2- RX2-
2 RX2+IN R138 10 1/16W
T2+ RX2+
3
SGND 4
T4- 5
T4+ 6 R101 47 1/16W SCL_IN
DDCCLK 7 R102 47 1/16W SDA_IN
DDCDAT 8
A_VSYNC
9 RX1-IN R139 10 1/16W
T1- RX1+IN RX1-
10 R140 10 1/16W
T1+ RX1+
11
SGND 12 DVI_5V
T3- 13 R103 10K 1/16W ZD101
T3+ 14
+5V 15
GND 16 HOT_PLUG
HPD MLL5232B 5.6V
17 RX0-IN GND R141 10 1/16W
T0- RX0+IN RX0-
18 R142 10 1/16W
T0+ RX0+
19
SGND 20
T5- 21
T5+ 22
SGND 23 RXC+IN