Acer AL2023W Schematic
Acer AL2023W
Service Guide
Service guide files and updates are available on the
CSD web: for more information,
Please refer to http://csd.acer.com.tw/
100% Recycled Paper
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Copyright
Copyright © 2003 by Acer Incorporated. All rights reserved. No part of this publication may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in
any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the
prior written permission of Acer Incorporated.
Disclaimer
The information in this guide is subject to change without notice. Acer Incorporated makes no representations or
warranties, either expresses 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, of 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.
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Conventions
The following conventions are used in this manual:
Screen messages
Note
Warning
Caution
Important
Denotes actual messages that appear on
screen
Gives bits and pieces of additional information
related to the current topic.
Alerts you to any damage that might result
from doing or not doing specific actions.
Gives precautionary measures to avoid
possible hardware or software problems.
Reminds you to do specific actions relevant to
the accomplishment of procedures.
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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 BASICCONFIGURATION
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 not 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
guidelines for energy efficiency.
®
Partner our company has determined that this product meets the ENERGY STAR
®
WARNING:
To prevent fire or chock 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
z Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub,
Swimming pool or in a wet basement.
z 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 manufacture or
sold with the monitor. If you mount the monitor on a wall or shelf, use a mounting kit approved by the
manufacture and follow the kit instructions.
z Slots and openings in the back and bottom of the cabinet area 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.
z 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.
z 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.
z 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.
z Do not overload power strips and extension cords. Overloading can result in fire or electric shock.
z 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.
z 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.
z 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.
z The wall socket shall be installed near the equipment and shall be easily accessible.
z 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
z 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.
z You may find slightly uneven brightness in the screen depending on the desktop pattern you use.
z 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.
z 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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Table of contents
Chapter 1 MONITOR FEATURE …………………………………………………………..9
Chapter 2 OPERATING INSTRUTION …………………………………………………….24
Chapter 3 MACHINE ASSEMBLY………………………………………………………….31
Chapter 4 TROBLE SHOOTING…………………………………………………………....44
Chapter 5 CONNECTOR INFORMATION ………………………………………………...47
Chapter 6 FRU LIST……………………………………………………………………….....49
Chapter 7 SCHEMATIC DIAGRAM …………………………………………………………52
Chapter 8 POWER BOARD INFORMATION ...............................................................61
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Monitor Feature
Chapter 1
Driving system TFT Color LCD
Size 20"W
Pixel pitch 0.258(H) * 0.258 (V)mm
Viewable angle 80/80/80/80 degree
LCD Panel
Input
Brightness
Contrast Ratio 1000:1 (typ.);800:1(min.)
Response time 5ms (Tr+Tf)
Video R,G,B Analog, DVI box (optional)
Separate Sync H/V TTL
panel: 300 cd/m2(typ)
H-Frequency 31-81KHZ
V-Frequency 56-75HZ
Display Color 16.7 million Colors
Maximum Dot Clock 162MHz
Max Resolution 1680X1050 @ 60Hz
Plug & Play VESA FPMPMI
ON Mode <47W
EPA ENERGY STAR
Audio output Rated Power 2.0W rms(Per channel)
OFF Mode <1W
Input Connector D-Sub 15 pin, DVI connector (on DVI box)
Input Video Signal Analog : 0.7Vp-p,75OHM
Horizontal : 473.76mm
Screen Size (Active)
Power Source 90~264 Vac, 47~63HZ
Environmental
Considerations
Weight (N.W.) 5.2kg(fixed base); 7.0kg(adjusted base)
Dimension Fixed base 513.8(W) x 417.7(H) x 203.8(D) mm
Adjusted base 513.8(W)x 390.6(H)x 258.4(D)mm
Vertical : 296.1mm
Operating Temp : 5 to 40 degree ;
Storage Temp : -20 to 60 degree ;
Operating Humidity : 20% to 80%
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* Power Switch
* MENU / EXIT
* / Volume
* / Volume
Switch
External Controls :
Regulatory Compliance cUL, FCC, TUV, CE, TCO03.
* AUTO / ENTER
* Contrast/brightness
* Focus
* Clock
* H.Position
* W.Position
* Language
* OSD Color temperature
* OSD Position & Timeout
* Auto Config
* Input
* Information
* Reset
* Exit
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Timings
The product has 34 memory modes in total. 26 modes are preset and 8 modes are user definable.
MODE NO. 1
RESOLUTION
Dot clock(MHz)
f h
H-Total ( us ) 31.78(900dots) 31.778 (800 dots) 28.571(864 dots) 26.413 (832 dots)
H-Sync ( us ) 3.813(108dots) 3.813 (96 dots) 2.116 (64 dots) 1.270(40 dots)
H-B-P ( us ) 1.907(54dots) 1.907 (48 dots) 3.175 (96 dots) 4.064(128 dots)
H-Active ( us ) 25.42(720dots) 25.422 (640 dots) 21.164 (640 dots) 20.317(640 dots)
H-F-P ( us ) 0.636(18dots) 0.636 (16 dots) 2.116 (64 dots) 0.762(24 dots)
f v
V-Total (ms ) 14.27(449 lines) 16.683 (525 lines ) 15.000 (525 lines ) 13.735(520 lines)
V-Sync ( ms ) 0.064(2 lines) 0.064 (2 lines ) 0.086 (3 lines ) 0.079(3 lines)
V-B-P (ms ) 1.112(35 lines) 1.049 (33 lines ) 1.114 (39 lines ) 0.739(28 lines)
V-Active ( ms ) 12.71(400 lines) 15.253 (480 lines ) 13.714 (480 lines ) 12.678(480 lines)
V-F-P ( ms ) 0.384(12 lines) 0.317 ( 10 lines) 0.086 (3 lines ) 0.237(9 lines)
720 x 40
28.321 25.175 30.24 31.5
31.469kHz 31.469
70Hz(70.087) 60Hz (59.940) 66.7 HZ (66.667) 72.809Hz
0 640 x 480 640x480 640 x 480
2
kHz 35.0kHz 37.861kHz
3 4
SYNC. H/V -/+ - / - +/+ -/-
POLARITY
SEP . SYNC Y Y Y Y
Or -/-
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MODE NO. 5 6 7 8
RESOLUTION
640 x 48
0 800 x 600 800 x 600 800 x 600
Dot clock(MHz)
f h
31.5 36 40 49.5
37.500kHz 35.16k
Hz 37.879kHz 46.875kHz
H-Total ( us ) 26.667(840 dots) 28.44(1024 dots) 26.40 (1056 dots) 21.333 (1056dots)
H-Sync ( us ) 2.032 (64 dots) 2.00(72 dots) 3.200 (128 dots) 1.616 (80 dots)
H-B-P ( us ) 3.810 (120 dots) 3.56(128 dots) 2.200 ( 88 dots) 3.232 (160 dots)
H-Active ( us ) 20.317 (640 dots) 22.22(800 dots) 20.00 ( 800 dots) 16.162 (800 dots)
H-F-P ( us ) 0.508 (16 dots) 0.67(24 dots) 1.000 (40 dots) 0.323 (16 dots)
f v
75Hz (75) 56.25 60Hz (60.316) 75Hz (75.000)
V-Total (ms ) 13.333 (500 lines) 17.78(625 lines) 16.58 (628 lines) 13.333 (625lines)
V-Sync ( ms ) 0.080 (3 lines) 0.06(2 lines) 0.106 (4 lines) 0.064 (3 lines)
V-B-P (ms ) 0.427 (16 lines) 0.63(22 lines) 0.607 (23 lines) 0.448 (21 lines)
V-Active ( ms ) 12.80 (480 lines) 17.07(600 lines) 15.84 (600 lines) 12.80 (600lines)
V-F-P ( ms ) 0.027 ( 1 line ) 0.03( 1 line) 0.026 (1 line ) 0.021 (1 line )
SYNC. H/V - / - +/+ + / + + / +
POLARITY
SEP . SYNC Y Y Y Y
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MODE NO. 9 10 11 12
RESOLUTION
Dot clock(MHz)
f h
800 x 60
0 832 x 624 1024 x 768 1024 x 768
50 57.283 65 75
48.077kHz 49.72k
Hz 48.363kHz 56.48kHz
H-Total ( us ) 20.80 (1040dots) 20.11(1152 dots) 20.677(1344 dots) 17.71(1328 dots)
H-Sync ( us ) 2.400 ( 120 dots) 1.12(64 dots) 2.092(136 dots) 1.81(136 dots)
H-B-P ( us ) 1.280 (64 dots) 3.91(224 dots) 2.462(160 dots) 1.92(144 dots)
H-Active ( us ) 16.00 (800 dots) 14.52( 832 dots ) 15.754(1024 dots) 13.65(1024 dots)
H-F-P ( us ) 1.120 (56 dots) 0.56(32 dots ) 0.369(24 dots) 0.32(24 dots)
f v
72Hz (72.188) 74.55Hz 60.004Hz 70.07Hz
V-Total (ms ) 13.85 (666 lines) 13.41(667 lines) 16.666(806 lines) 14.27(806 lines)
V-Sync ( ms ) 0.125 (6 lines) 0.06(3 lines) 0.124(6 lines) 0.11(6 lines)
V-B-P (ms ) 0.478 (23 lines) 0.78(39 lines) 0.600(29 lines) 0.51(29 lines)
V-Active ( ms ) 12.48 (600 lines) 12.55 (624 lines) 15.880(768 lines) 13.60(768 lines)
V-F-P ( ms ) 0.770 ( 37 line ) 0.02(1 line) 0.062(3 lines) 0.05(3 lines)
SYNC. H/V + / + +/+ -/- -/-
POLARITY
SEP . SYNC Y2 Y Y Y
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MODE NO. 13 14 15 16
RESOLUTION
Dot clock(MHz)
f h
1024 x 7
68 1280 x 1024 1280 x 1024 1152 x 864
78.75 108 135 108
60.02k
Hz 63.981kHz 79.976KHz 67.5 KHz
H-Total ( us ) 16.66(1312 dots) 15.630 (1688 dots) 12.504 (1688 dots) 14.815(1600 dots)
H-Sync ( us ) 1.22 (96 dots) 1.037 (112 dots) 1.067 (144 dots) 1.185(128 dots)
H-B-P ( us ) 2.23 (176 dots) 2.296 (248 dots) 1.837 (248 dots) 2.370(256 dots)
H-Active ( us ) 13.00 (1024 dots) 11.852 (1280 dots) 9.481 (1280dots) 10.667(1152 dots)
H-F-P ( us ) 0.20 (16 dots) 0.444 (48 dots) 0.119 (16 dots) 0.593(64 dots)
f v
75.03Hz 60.020Hz 75.025 Hz 75.06 Hz
V-Total (ms ) 13.33 (800 lines) 16.661 (1066 lines) 13.329 (1066 lines) 13.333(900 lines)
V-Sync ( ms ) 0.05 (3 lines) 0.047 ( 3 lines) 0.038 (3 lines) 0.044(3 lines)
V-B-P (ms ) 0.47 (28 lines) 0.594 ( 38 lines) 0.475 (38 lines) 0.474(32 lines)
V-Active ( ms ) 12.80 (768 lines) 16.005 (1024 lines) 12.804(1024 lines) 12.800(864 lines)
V-F-P ( ms ) 0.02 (1 lines) 0.016 (1 line ) 0.013 (1 lines) 0.015(1 lines)
SYNC. H/V +/+ +/+ +/+ +/+
POLARITY
SEP . SYNC Y Y Y Y
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MODE NO. 17 18 19 20
RESOLUTION
Dot clock(MHz)
f h
1280 x 9
60 1600 x 1200 1280 x 720 1280 x 768
108 162 74.481 79.5
60.000 KHz
75.000 KHz 44.760KHz 47.776KHz
H-Total ( us ) 16.667 (1800dots) 13.333 (2160 dots) 22.341 (1664dots) 20.931 (1664dots)
H-Sync ( us ) 1.037 ( 112 dots) 1.185 ( 192 dots) 1.826 ( 136 dots) 1.61 ( 128 dots)
H-B-P ( us ) 2.889 (312 dots) 1.877 (304 dots) 2.578 (192 dots) 2.415 (192 dots)
H-Active ( us ) 11.852 (1280 dots) 9.877 (1600 dots) 17.186 (1280 dots) 16.101 (1280 dots)
H-F-P ( us ) 0.889 (96 dots) 0.395 (64 dots) 0.752 (56 dots) 0.805 (64 dots)
f v
60.00Hz 60.00 Hz 60.000Hz 59.87Hz
V-Total (ms ) 16.667 (1000 lines) 16.667 (1250 lines) 16.667 (746 lines) 16.703 (798 lines)
V-Sync ( ms ) 0.050 (3 lines) 0.040 (3 lines) 0.067 (3 lines) 0.147 (7 lines)
V-B-P (ms ) 0.600 (36 lines) 0.613 (46 lines) 0.492 (22 lines) 0.419 (20 lines)
V-Active ( ms ) 16.000 (960 lines) 16.000 (1200 lines) 16.086 (720 lines) 16.075 (768 lines)
V-F-P ( ms ) 0.017 ( 1 line ) 0.013 ( 1 line ) 0.022 (5 lines) 0.063 (3 lines)
SYNC. H/V + / + + / + - / + -/+
POLARITY
SEP . SYNC Y Y Y Y
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MODE NO. 21 22 23 24
RESOLUTION
Dot clock(MHz)
f h
1280 x 7
68 1360 x 768 1440 x 900 1440 x 900
102.25 85.5 106.5 136.75
60.289KHz 47.712
KHz 55.935KHz 70.635KHz
H-Total ( us ) 16.587 (1696dots) 20.959 (1792dots) 17.878 (1904dots) 14.157 (1936dots)
H-Sync ( us ) 1.252 ( 128 dots) 1.31 ( 112 dots) 1.427 ( 152 dots) 1.112 ( 152 dots)
H-B-P ( us ) 2.034 (208 dots) 2.994 (256 dots) 2.178 (232 dots) 1.814 (248 dots)
H-Active ( us ) 12.518 (1280 dots) 15.906 (1360 dots) 13.521 (1440 dots) 10.53 (1440 dots)
H-F-P ( us ) 0.782 (80 dots) 0.749 (64 dots) 0.751 (80 dots) 0.702 (96 dots)
f v
74.893Hz 60.015Hz 59.887Hz 74.984Hz
V-Total (ms ) 13.352 (805 lines) 16.662 (795 lines) 16.698 (934 lines) 13.336 (942 lines)
V-Sync ( ms ) 0.116 (7 lines) 0.126 (6 lines) 0.107 (6 lines) 0.085 (6 lines)
V-B-P (ms ) 0.448 (27 lines) 0.377 (18 lines) 0.447 (25 lines) 0.467 (33 lines)
V-Active ( ms ) 12.739 (768 lines) 16.097 (768 lines) 16.09 (900 lines) 12.741 (900 lines)
V-F-P ( ms ) 0.05 (3 lines) 0.063 (3 lines) 0.054 (3 lines) 0.042 (3 lines)
SYNC. H/V -/+ + / + -/+ -/+
POLARITY
SEP . SYNC Y Y Y Y
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MODE NO. 25 26
RESOLUTION
Dot clock(MHz)
f h
H-Total ( us ) 15.316 (2240 dots) 32.237 (1088 dots)
H-Sync ( us ) 1.203 ( 176 dots) 3.319 (112 dots)
H-B-P ( us ) 1.915 (280 dots) 3.319 (112 dots)
H-Active ( us ) 11.487 (1680 dots) 25.126 (848 dots)
H-F-P ( us ) 0.711 (104 dots) 0.474 (16 dots)
f v
V-Total (ms ) 16.679 (1089 lines) 16.667 (517 lines )
V-Sync ( ms ) 0.092 (6 lines) 0.258 (8 lines )
V-B-P (ms ) 0.459 (30 lines) 0.741 (23 lines )
V-Active ( ms ) 16.082 (1050 lines) 15.474 (480 lines )
V-F-P ( ms ) 0.046 ( 3 line ) 0.193 (6 lines )
SYNC. H/V -/+ + / +
POLARITY
1680 x 1050 848 x 480
146.25 33.75
65.29 KHz 31.02 KHz
59.954 Hz 60 Hz
SEP . SYNC Y Y
A
B : H- Sync width P : V- Sync width
C : H- Back porch Q :.V- Back porch
D : H- Video width R : V- Video width
E : H- Front porch S :.V- Front porch
: H-Total
O: V-Total
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5
Monitor block diagram
A3
D D
PC5V
PC5V
C C
PC5V
3.INPUT
A2
GNDR
GNDG
GNDB
SOG
VSYNC
HSYNC
CLK+
CLK-
DDCA_SDA
DDCA_SCL
DET_VGA
DDCD_SDA
DDCD_SCL
DET_DVI
HPD_CTRL
PC5V
B B
VCC3.3
VCC1.8
VCC12+5V
VCC12
+5V
VCC3.3
VCC1.8
Adj_BACKLIGHT
VCTRL
on_BACKLIGHT
RIN
GIN
BIN
R+
R-
G+
GB+
4
3
2
1
Main Board
A4
RIN
GNDR
GIN
GNDG
BIN
GNDB
SOG
VSYNC
HSYNC
R+
RG+
GB+
B-
BCLK+
CLK-
DDCA_SDA
DDCA_SCL
DET_VGA
DDCD_SDA
DDCD_SCL
DET_DVI
HPD_CTRL
VCTRL
on_BACKLIGHT
Adj_BACKLIGHT
LVA0P
LVA0M
LVA1P
LVA1M
LVA2P
LVA2M
LVACKP
LVACKM
LVA3P
LVA3M
LVB0P
LVB0M
LVB1P
LVB1M
LVB2P
LBA2M
LVBCKP
LVBCKM
LVB3P
LVB3M
on_PANEL
+5V
VCC1.8
VCC3.3
VOLUME
STBY
MUTE
VCC1.8
+5V
VCC3.3
A5
LVA0P
LVA0M
LVA1P
LVA1M
LVA2P
LVA2M
LVACKP
LVACKM
LVA3P
LVA3M
LVB0P
LVB0M
LVB1P
LVB1M
LVB2P
LVB2M
LVBCKP
LVBCKM
LVB3P
LVB3M
on_PANEL
5.PANEL
A6
VOLUME
STBY
MUTE
6.AUDIO
+5V
VCC12
VCC3.3
VCC12
+5V
VCC12
VCC3.3
VCC12
2.POWER
A A
5
4
4.SCALER
T
Title
Size Document Number Rev
Date: Sheet
3
2
BLOCK
A1AA
77
of
1
PCB LAYOUT
Main Board
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