Acer AL2023 Schematic

Acer AL2023 (Dual)

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 © 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 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® Partner our company has determined that this product meets the ENERGY STAR

guidelines for energy efficiency.

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

l Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub,

Swimming pool or in a wet basement.

l 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.

l 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.

l 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.

l 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.

l 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.

l Do not overload power strips and extension cords. Overloading can result in fire or electric shock. l 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.

l 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.

l 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.

l The wall socket shall be installed near the equipment and shall be easily accessible. l 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

l 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.

l You may find slightly uneven brightness in the screen depending on the desktop pattern you use. l 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.

l 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 …………………………………………………….19

Chapter 3 MACHINE ASSEMBLY ………………………………………………………. .24

Chapter 4 TROUBLE SHOOTING ………………………………………………………..36

Chapter 5 CONNECTOR INFORMATION ………………………………………………39

Chapter 6 FRU LIST ………………………………………………………………………...41

Chapter 7 SCHEMATIC DIAGRAM ………………………………………………………...42

Chapter 8 POWER BOARD INFORMATION……………………………………………….48

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Monitor Feature

LCD Panel

Driving system TFT Color LCD Size 20" Pixel pitch 0.294 mm

Viewable angle Samsung: 89/89/89/89 degree(typ.)

LG: 89/89/89/89 degree(typ.)

Brightness

Contrast Ratio 800:1 (Samsung LTM201U1-L01)

Samsung LTM201U1-L01: 300 cd/m2(typ.) LG LM201U05-SLA1: 300 cd/m2(typ.)

Chapter 1

800:1(LG LM201U05-SLA1) Response time Samsung LTM201U1-L01 16ms, LG LM201U05-SLA1 16ms Video R,G,B Analog,

Input

H-Frequency 31-81KHZ V-Frequency 56-75HZ

Display Color 16.2 million Colors Maximum Dot Clock ® 162MHz Max Resolution 1600x1200@75HZ Plug & Play VESA DDC2B

EPA ENERGY STAY Audio output Rated Power 2.0W rms(Per channel) Input Connector D-Sub, DVI-D Input Video Signal Analog : 0.7Vp-p,75OHM

Separate Sync H/V TTL

ON Mode <60W OFF Mode <2W

Horizontal : 408mm

Screen Size (Active) Power Source 90~264 Vac, 47~63HZ

Vertical : 306mm

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Environmental

Operating Temp : 5 to 40 degree ;

Considerations

Weight (N.W.) Dimension 6.4kg

Storage Temp : -20 to 60 degree ;

Operating Humidity : 10% to 85%

453.6(W)x427.6(H)x202.58mm(D)

External Controls

Switch * Power Switch

* MENU / EXIT * / Volume * / Volume * AUTO / ENTER

* Contrast/brightness * Focus * Clock * H.Position * W.Position * Language * OSD Color temperature * OSD Position & Timeout * Auto Config * Input * Information * Reset * Exit

Regulatory Compliance cUL, FCC, TUV, CE, ISO13406-2

Timings

The product has 28 memory modes in total. 18 modes are preset and 10 modes are user definable.

MODE NO.

1 2 3 4

RESOLUTION

720 x 400 640 x 480 640x480 640 x 480

Dot

28.321 25.175 30.24 31.5

clock(MHz)

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f h

31.469kHz 31.469kHz 35.0kHz 37.861kHz

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 )

70Hz(70.087) 60Hz (59.940) 66.7 HZ (66.667)

15.000 (525

72.809Hz

13.735(520 lines)

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

12.678(480 lines)

lines )

V-F-P ( ms ) 0.384(12 lines) 0.317 ( 10 lines) 0.086 (3 lines ) 0.237(9 lines)

SYNC. H/V -/+ - / - +/+ -/POLARITY Or -/-

SEP . SYNC

MODE NO.

RESOLUTION

Y Y Y Y

5 6 7 8

640 x 480 800 x 600 800 x 600 800 x 600

Dot

31.5 36 40 49.5

clock(MHz)

f h

H-Total ( us ) 26.667(840 dots)

37.500kHz 35.16kHz 37.879kHz 46.875kHz

28.44(1024 dots) 26.40 (1056

21.333 (1056dots)

dots)

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 (640dots) 22.22(800 dots) 20.00 ( 800 dots) 16.162 (800 dots)

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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)

V-Active ( ms ) 12.80 (480 lines)

V-F-P ( ms ) 0.027 ( 1 line )

17.07(600 lines) 15.84 (600 lines) 12.80 (600lines)

0.03( 1 line) 0.026 (1 line ) 0.021 (1 line )

0.448 (21 lines)

SYNC. H/V - / - +/+ + / + + / + POLARITY

SEP . SYNC

MODE NO.

RESOLUTION

Y Y Y Y

9 10 11 12

800 x 600 832 x 624 1024 x 768 1024 x 768

Dot

50 57.283 65 75

clock(MHz)

f h

H-Total ( us ) 20.80 (1040dots)

H-Sync ( us ) 2.400 ( 120 dots)

H-B-P ( us ) 1.280 (64 dots)

48.077kHz 49.72kHz 48.363kHz 56.48kHz

20.11(1152 dots) 20.677(1344 dots) 17.71(1328 dots)

1.12(64 dots) 2.092(136 dots)

3.91(224 dots) 2.462(160 dots)

1.81(136 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

V-Total (ms ) 13.85 (666 lines)

72Hz (72.188) 74.55Hz 60.004Hz 70.07Hz

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)

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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 lines ) 0.02(1 line) 0.062(3 lines) 0.05(3 lines)

SYNC. H/V + / + +/+ -/- -/POLARITY

SEP . SYNC

Y Y Y Y

MODE NO.

RESOLUTION

13 14 15 16

1024 x 768 1280 x 1024 1280 x 1024 1152 x 864

Dot

78.75 108 135 108

clock(MHz)

f h

H-Total ( us ) 16.66(1312 dots) 15.630 (1688 dots)

60.02kHz 63.981kHz 79.976KHz 67.5 KHz

12.504 (1688

14.815(1600 dots)

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

V-Total (ms ) 13.33 (800 lines) 16.661 (1066 lines)

75.03Hz 60.020Hz 75.025 Hz 75.06 Hz

13.329 (1066

13.333(900 lines)

lines)

V-Sync ( ms )

V-B-P (ms ) 0.47 (28 lines) 0.594 ( 38 lines) 0.475 (38 lines)

V-Active ( ms ) 12.80 (768 lines) 16.005 (1024 lines)

0.05 (3 lines) 0.047 ( 3 lines) 0.038 (3 lines) 0.044(3 lines)

0.474(32 lines)

12.804(1024

12.800(864 lines)

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

MODE NO.

17 18

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RESOLUTION

1280 x 960 1600 x 1200

Dot

108 162

clock(MHz)

f h

60.000 KHz 75.000 KHz

H-Total ( us ) 16.667 (1800dots) 13.333 (2160 dots)

H-Sync ( us ) 1.037 ( 112 dots)

1.185 ( 192 dots)

H-B-P ( us ) 2.889 (312 dots) 1.877 (304 dots)

H-Active ( us ) 11.852 (1280 dots) 9.877 (1600 dots)

H-F-P ( us ) 0.889 (96 dots)

0.395 (64 dots)

f v

60.00Hz 60.00 Hz

V-Total (ms ) 16.667 (1000 lines) 16.667 (1250 lines)

V-Sync ( ms ) 0.050 (3 lines) 0.040 (3 lines)

V-B-P (ms ) 0.600 (36 lines) 0.613 (46 lines)

V-Active ( ms ) 16.000 (960 lines) 16.000 (1200 lines)

V-F-P ( ms ) 0.017 ( 1 line ) 0.013 ( 1 line )

SYNC. H/V + / + + / + POLARITY

SEP . SYNC

Y Y

B : H- Sync width P : V- Sync width

C : H- Back porch Q :.V- Back porch

: H-Total

: H- Video width R : V- Video width

: V-Total

: H- Front porch S :.V- Front porch

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Monitor Block Diagram

PCB CONDUCTOR VIEW

Main Board

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+ 34 hidden pages