Acer AL2021 Schematic

Acer AL2021

Service Guide

Service guide files and updates are available on the CSD web: for more information, Please refer to http://csd.acer.com.tw/

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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

 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 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.

 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.

 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 in 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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Table of contents

Chapter 1 MONITOR FEATURE ………………………………………………………….9

Chapter 2 OPERATING INSTRUTION …………………………………………………….15

Chapter 3 Machine assembly ……………………………………………………………22

Chapter 4 TROBLE SHOOTING ………………………………………………………….32

Chapter 5 CONNECTOR INFORMATION ……………………………………………….34

Chapter 6 FRU LIST ………………………………………………………………………..36

Chapter 7 SCHEMATIC DIAGRAM …………………………………………………………40

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Monitor Feature

Chapter 1

Driving system TFT Color LCD

Size 20.1"

Pixel pitch 0.255 mm

Viewable angle 85(H) x 85 (V) degree

Brightness 250 cd/m2(typ)

Contrast Ratio 600:1 (typ)

LCD Panel

Input

H-Frequency 31-81KHZ

V-Frequency 56-75HZ

Display Color 16.7 million Colors

Maximum Dot Clock ® 135MHz

Max Resolution 1600x1200@60HZ

Plug & Play VESA DDC2B

EPA ENERGY STAY

Audio output Rated Power 2.0W rms(Per channel)

Input Connector

Response time 20ms (Tr+Tf)

Video R,G,B Analog

Separate Sync H/V TTL

ON Mode <58W

OFF Mode <3W

D-Sub 15 pin

DVI-D 24 pin

Analog : 0.7Vp-p,75OHM

Input Video Signal

Maximum Screen Size

Power Source 90~240 Vac, 50~60HZ

Environmental

Considerations

Weight (N.W.) 9.2kg

Dimension 460(W) x 474(H) x 135(D) mm

Digital TMDS , 100OHM

Horizontal : 408mm

Vertical : 308mm

Operating Temp : 0 to 40 degree ; Altitude:3000mm

Storage Temp : -20 to 60 degree ; Altitude :12000mm

Operating Humidity : 5% to 90%

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* Power Switch

* MENU/ENTER

* >/ Volume

* </ Volume

Switch

Function

* Auto Adjust KEY

* Contrast/brightness

* Focus / Clock

* H. / V.Position

* COLOR

* Language

* OSD SETTING : H / V. Position & Timeout

* Input Signal Selection

* Information

* Reset

External Controls :

* Exit

Regulatory Compliance UL, CSA, FCC, TUV/GS, CE, TCO03, ISO13406-2

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PRESET TIMING

# mode Resolution Hz (KHz)

IBM VGA 720 x 400 70 31.46

VESA 640 x 480 60 31.46

MAC 13” 640 x 480 67 35

VESA 640 x 480 72 37.86

VESA 640 x 480 75 37.5

VESA 800 x 600 56 35.16

VESA 800 x 600 60 37.87

VESA 800 x 600 72 48.07

VESA 800 x 600 75 46.87

MAC 16” 832 x 624 75 49.72

VESA 1024 x 768 60 48.36

VESA 1024 x 768 70 56.48

VESA 1024 x 768 75 60.02

VESA 1152 x 864 75 67.5

Fv Fh

VESA 1280 x 1024 60 63.98

VESA 1280 x 1024 75 79.97

VESA 1600 x 1200 60 75

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Monitor Block Diagram

DVI INPUT

( CN8 )

VGA INPUT

( CN7 )

MEMORY I /F

39VF020 ( XU1 )

AUDIO IN ( L/R )

DIGITAL DDC

24AA02 (U12)

SDA/SCL

ANALOG DDC

24AA02 (U10)

SDA/SCL

+3. 3V_ I/ O_MALIBU

+1.8V_CORE

RX2 , RX1, RX0 , RXC

RED , GREEN , BLUE , SDA/S CL

OCMADDR[0.. 19] ,OCMDATA[0. .7]

+3.3V_LBADC

MUTE

TPA3002D2 ( U9 )

PWM1

VOLUME

AUDIO

+2.5V_DDR

+3. 3V_LVDS A

+3. 3V_LVDS B

GM1601 (U5)

SPKR0+/-

SPKL0+/-

+1. 8V_DVI

+3.3V_LVDS

TXA0+/- , TXA1+/- , TXA2+/- , TXA3+/- , TXAC+/-

TXB0+/- ,TXB1+/- , TXB2+/- , TXB3+/- , TXBC+/-

SPEAK

( CN6 )

+1.8V_ADC

+3.3V_DVI

FSD ATA,F SADDR ,F SBKSE L0/ 1

LBADC_RETURN / IN1 / IN2 / IN3

+3.3V_PLL

+3.3V_ADC

RESET

MSTR SCL/ SDA

FSCLK-/+,FSDQM

POWER SWITCH

AIC 1563 (U2)

(U3) +2.5V (U4) +3.3V (U6) +1.8V

MAX809_1 (U8)

24LC32SN (U7)

FRAME STORE

MT46V2M32LG-4 ( U1 )

TO PANEL

KEY CONTROL

/RESET

I2C

(CN2)

(CN4)

+12V FROM POWER BOARD

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PCB CONDUCTOR VIEW

Main Board

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Button Board

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Chapter 2

OPERATING INSTRUCTIONS

Front Panel Definition

This Section defines the front panel User Interface for Led Indictor and Key function.

Key Definition:

There are five keys defined in this system and described bellows.

* Adjusting display settings

External Controls

Power on/off

Blue and Green : power on

POWER

AUTO

OSD Function

MINUS

Blue : Power off

Orange: in sleep mode

If OSD is active, press to exit a selection in OSD. If OSD is

inactive, press and the monitor will automatically optimize

the position, focus and clock of your display.

Press to view OSD.

Press again to enter a selection in OSD.

If OSD is active, press to select or adjust OSD options. If

OSD is inactive, press once, then press the buttons marked

< or > to adjust the volume.

If OSD is active, press to select or adjust OSD options. If

PLUS

OSD is inactive, press once, then press the buttons marked

< or > to adjust the volume.

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+ 32 hidden pages