Acer AL1721h User manual

Acer AL1721h
Service Guide
Service guide files and updates are available
on the CSD web; for more information,
please refer to http://csd.acer.com.tw

1
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 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.

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.

3
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.

4
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.

5
Precautions
zDo not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub,
swimming pool or in a wet basement.
zDo 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.
zSlots 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.
zThe 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.
zThe 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.
zUnplug 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.
zDo not overload power strips and extension cords. Overloading can result in fire or electric shock.
zNever 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.
zDo 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
zTo ensure satisfactory operation, use the monitor only with UL listed computers which have
appropriate configured receptacles marked between 100 - 240V AC, Min. 3.5A.
zThe wall socket shall be installed near the equipment and shall be easily accessible.
zFor use only with the attached power adapter (output 12V DC)which have UL,CSA listed license

6
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.

7
Chapter 1 Monitor Features ……………………………………………. 8
Monitor Features …………………………………………… 8
Electrical Requirements …………………………………………… 10
LCD Monitor General Specification …………………………………………… 11
LCD Panel Specification …………………………………………… 12
Support Timing …………………………………………… 14
Factory Preset Timing Table …………………………………………… 14
Block Diagram …………………………………………… 15
Main board Diagram …………………………………………… 16
Software Flowchart …………………………………………… 17
Main board Layout …………………………………………… 18
Front Bezel …………………………………………… 23
Rear Bezel …………………………………………… 24
Chapter 2 Operatin
g
Instructions
……………………………………………. 25
External Controls …………………………………………… 25
Front Panel Controls …………………………………………… 25
OSD Menu …………………………………………… 27
Hot-Key Menu …………………………………………… 30
OSD Message …………………………………………… 30
LOGO …………………………………………… 31
Chapter 3 Machine Disassembl
y
……………………………………………. 32
Chapter 4 Troubleshooting
……………………………………………. 34
Chapter 5 Connector Information
……………………………………………. 40
Chapter 6 FRU (Field Replacement Unit) List
……………………………………………. 41
Exploded Diagram …………………………………………… 41
Chapter 7 Schematic Dia
g
ram
……………………………………………. 44
Analog and Digital Input …………………………………………… 44
GM5120/GM2120 …………………………………………… 45
LVD-S …………………………………………… 46
Key Board Connector …………………………………………… 47
Audio …………………………………………… 48
DC Power 49
Appendix Online Support Information ……………………………………………. 50
Table Of Contents

8
MonitorFeatures
AU SAMSUNG(Option)
Driving
system TFT Color LCD TFT Color LCD
LCD Panel Size 43.2cm(17.0") 43.2cm(17.0")
Pixel pitch 0.264mm( H )x 0.264mm( V ) 0.264mm( H )x 0.264mm( V )
Brightness 260cd/m2(Typical) 250cd/m2(Typical)
Contrast 450:1(Typical) 350:1(Typical)
Viewable
angle 140°(H) 140°(V) 140°(H) 120°(V)
Response time 16ms(Tr+Tf ),Tr=4ms,Tf=12ms 25 ms(Tr+Tf)Tr=5ms/Tf=20ms
R,G,B Analog Interface
Video
Digital Digital
Input Separate Sync. H/V TTL H/V TTL
H-Frequency 30KHz – 80KHz 30KHz – 80KHz
V-Frequency 55-75Hz 55-75Hz
Display Colors 16.2M Colors 16.2M Colors
Dot Clock 165MHz 165MHz
Max. Resolution 1280 x 1024 @75Hz 1280 x 1024 @75Hz
Plug & Play VESA DDC1/2BTM VESA DDC1/2BTM
ON Mode ≤45W ≤45W
EPA ENERGY
STAR®OFF Mode ≤3W ≤3W
D-Sub 15pin
Input Connector
DVI-D 24pin
Input Video Signal
Analog:0.7Vp-p(standard),
75 OHM, Positive
Digital:DVI-D
Analog:0.7Vp-p(standard),
75 OHM, Positive
Digital:DVI-D
Maximum Screen
Size Horizontal : 337.92mm
Vertical : 270.34mm
Horizontal : 337.92mm
Vertical : 270.34mm
Power Source 100~264VAC,47~63HZ
100~264VAC,47~63HZ
Environmental
Considerations
Operating Temp: 5° to 50°C
Storage Temp.: -20° to 65°C
Operating Humidity: 10% to 85%
Operating Temp: 5° to 50°C
Storage Temp.: -20° to 65°C
Operating Humidity: 10% to 85%
Dimensions 430(W)×445(H)×152(D)mm
Weight (N. W.) 5.0kg Unit (net)
Chapter 1

9
Switch
•Auto Adjust Key
•</Volume
•>/ Volume
•Power Button
•MENU/ Exit
•Auto Adjust Key
•</Volume
•>/ Volume
•Power Button
•MENU/ Exit
External Controls: Functions
•Contrast
•Brightness
•Focus
•Clock
•H.Position
•V.Position
•Input Selected
•Language
•Dos-mode resolution selected
•(Warm) Color
•(Cool)Color
•RGB Color temperature
•Reset
•OSD timeout
•information
•Exit
•Contrast
•Brightness
•Focus
•Clock
•H.Position
•V.Position
•Input Selected
•Language
•Dos-mode resolution selected
•(Warm) Color
•(Cool)Color
•RGB Color temperature
•Reset
•OSD timeout
•information
•Exit
Power Consumption ( Maximum ) 45 Watts 45 Watts
Audio Output
R
ated Power 1W rms (Per channel)
R
ated Power 1W rms (Per channel)
Regulatory Compliance CSA, TÜV/GS, CE, TCO’99, UL CSA, TÜV/GS, CE, TCO’99, UL

10
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.
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 °C
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

11
LCD Monitor General Specification
Panel type: 17 “ active matrix color TFT LCD
1). AU EN05
Display size: 337.92mm (H) ×270.34mm(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) standard resolution
Pixel pitch: 0.264mm(H) ×0.264mm(V)
Display dot: 1280 x (RGB) ×1024
Pixel clock: 25.2 – 135.0MHz
Contrast ratio: θ= 0° AU EN05 450:1
Brightness: AU EN05 260 cd/㎡
Response time (Tr/Tf): AU EN05(16ms)
Display color: 16.2M(6 bit color+FRC)
Viewing angle: AU EN05 L / R ≧80/ ≧80 (≧160 degrees horizontal typical)
U / D ≧70 / ≧70 (≧140 degrees vertical typical)
Luminance uniformity: > 80 % (typical)
Pc interface: 1).Video: RGB analog 0.7V peak to peak
Sync: TTL positive or negative
Signal connector: 15 pin Mini D type, (standard VGA video)
3.5 mm stereo audio jack (Audio) (For AR577 only)
Audio power: 1.5Wrms + 0.5Wrms (300Hz – 1.3kHz)
Front control: power on/off with LED select adjustment
Interface frequency
Horizontal Frequency 30KHz --80KHz
Vertical Frequency 55Hz ------75Hz
Plug & play: Support VESA DDC2B functions
Power Input voltage: Single phase, 50/60HZ, 100 VAC to 240VAC ±10%
Total output power: 50 Watt max.
LCD Panel Specification
LCD Panel Model (Hydis LT17E12-200)
ٛDisplayType activematrixcolorTFTLCD
ٛResolution 1280x1024 pixels
ٛDisplay Dot 1280x (RGB) x 1024
ٛDisplay Area 337.92mm(H) x 270.34mm(V)
ٛPixel Pitch 0.264mm(H) x 0.264mm(V)
ٛDisplay Color 16M (6 bite color+FRC)

12
ٛLamp Voltage 700 Vrms (typ)
ٛLamp Current 6.5 mArms (typ)
ٛWeight 2000g (typ)
ٛOptical Specifications
IL= 7.0mA Ta= 25 ±2°C VDD = 5V FV= 60Hz FDCLK = 54MHz
ITEM Symbol Condition MIN. TYP. MAX. UNIT
Contrast Ratio
(Center of screen) CR 250 450 -
Rising TR=4
Response
Time at Ta Falling TF=12 -16 -(total) msec
Luminance of white
(Center of screen) YL200 260 -cd/mm
RX0.61 0.64 0.67
Red RY0.31 0.34 0.37
GX0.26 0.29 0.32
Green GY0.58 0.61 0.64
BX0.11 0.14 0.17
Blue BY0.04 0.07 0.10
WX0.28 0.31 0.34
Color
Chromaticity
(CIE)
White WY
θ=0,
φ=0
Normal
Viewing
Angle
0.30 0.33 0.36
θL-80 -
Hori. θR-80 -
φH-70 -
Viewing
Angle Vert . φL
CR≥10
-70 -
Degrees
Brightness Uniformity BUNI -75 80 %
Flicker F --5%
Cross talk CT --2%

13
Panel Relative Humidity
Input Signals
Video input
ٛType AnalogR,G,B.
ٛInput Impedance 75 ohm +/- 2%
ٛPolarity Positive
ٛAmplitude 0 - 0.7 +/- 0.05 Vp
ٛDisplayColor sameasLCDpanel
Sync input
ٛSignal separatehorizontal and vertical sync, or composite sync
which are TTL compatible
ٛPolarity positiveandnegative.
Interface frequency
The following frequency range is generalized by supported timing. If the entered mode does not
match the supported timing the display optimization will not be assured.
ٛHorizontal Frequency 30KHz --80KHz
ٛVertical Frequency 55Hz -------75Hz
Panel bright dot defect and dark dot defect
Test conditions:
ٛ1280*1024,64KHz/60Hz
ٛR.G.B.Full White and Full Black Pattern
ٛRECALL
1. Bright Dots: R.G or B dots ≤3dots (G dots <3dots)
2. Adjacent dot<1 groupTotal bright dots ≤3dots
3. Dark Dots: -R.G or B dots ≤5dots - 2 adjacent dot<2 group Total dark dots ≤5dots
4. Total(Dark & Bright) ≤7dots

14
Supported Timing
TIMING FH(KHZ)/
FV(HZ)
SYNC
POLARITY
TOTAL
(DOT/LINE)
ACTIVE
(DOT/LINE)
SYNC
WIDTH
(DOT/LINE)
FRONT
PORCH
(DOT/LINE)
BACK
PORCH
(DOT/LINE)
PIXEL
FOREQ.
(MHZ)
640x350 /DOS 37.9/70 + 800 449 64 32 96 25.175
31.5/59.9 - 800 525 96 8 40 25.175
37.9/72.8 - 800 520 40 16 120 31.5
640x480
VGA 37.5/75 - 840 500 64 16 120 31.5
35.2/56.3 + 1024 625 72 24 128 36.0
37.9/60.3 + 1056 628 128 40 88 40.0
48.1/72.2 + 1040 666 120 56 64 50.0
800x600
SVGA
46.9/75 + 1056 625 80 16 160 49.0
48.4/60.0 - 1344 806 136 24 160 60.0
56.5/70.1 - 1328 806 136 24 144 70.0
1024x768
XGA
60/75 + 1312 800 96 16 176 75.0
63.98/60.02 + 1688 1066 112 48 248 108
1280x1024
SXGA 79.98/75.03 + 1688 1066 144 16 248 135
Factory Preset Timing Table
STANDARD RESOLUTION HORIZONTAL
FREQUENCY (kHz)
VERTICAL
FREQUENCY (Hz)
720 x 400 31.47 70.0
640 × 480 31.47 60.0
640 × 480 35.00 66.6
640 × 480 37.50 75.0
VGA
640 × 480 37.861 72.8
800 × 600 35.156 56.3
800 × 600 37.879 60.0
800 × 600 48.077 72.2
800 × 600 46.875 75.0
SVGA
832 x 624 49.725 75.0
1024 × 768 48.363 60.0
1024 × 768 56.476 70.0
1024 x 768 60.24 74.9
XGA
1024 × 768 60.02 75.0
Note: the IBM modes and Mac modes not in table, please refer to the spec!

15
Monitor Block Diagram
The LCD MONITOR will contain an main board, an inverter/power board, keypad board and internal
adapter which house the flat panel control logic, brightness control logic and DDC.
The Inverter board will drive the backlight of panel and the DC-DC conversion.
The Adapter will provides the 12V DC-power to inverter/power board.
Monitor Block Diagram
KEY BOARD
SPEAKER SPEAKER
IDPC LAMP
LCD PANEL
Analog in LCD Controller
-Scaler
-OSD
-ADC
DC-DC
Flash rom
Adapter (12V)
Digital in
POWER(90V-264)
Audio IC

16
RGB
U601
Winbond
RXD/TXD
KEY Control
AT24C16
U602
EPR SDA/SCL
Panel
PA 0~9
PB 0~9
VLCD
U203
GM5120
HS/VS
VAA3VCC2.5V
VCC3.3V
VAA1
VAA4
VAA2
AT24C02
(DDC)U104
DDC SCL/SDA
VGA Input
VGA R/G/B
VGA Hsync/Vsync
MAIN BOARD DIAGRAM
AT24C02
(DDC)U102
DVI
Signal

17
Software Flow Chart
Y
N
In standby mode ?
Y
Check the analog port, are there
any signals coming ?
Wake up the scalar. ?
Does the scalar send out a
interru
p
t re
q
uest ?
Update the life time of back light.
Are there any signals
comin
g
from analo
g
p
ort ?
YNDisplay "No connection Check
Signal Cable" message. And go
into standby mode after the
message disappear.
Program the scalar to be able to show the coming mode.
N
Read the keyboard. Is the power key pressed ?
Process the
OSD display.
N
Y
N
Y
Are the AUTO and
SELECT ke
y
s
p
ressed ?
N
Enter factory mode.
Y
Save the power key status into eeprom.Turn on the
LED and set it to green color.Scaler initialize.
Get the PWM value of brightness from eeprom.
MCU initialize
Is the eeprom blank ? Program the eeprom
by default values.
Y
Is the power key pressed ?
Clear all global flags.
Y
N
N

18
Monitor Board Layout

19
Label Component
U1 TDA7496L BY ST
U102 M24C02-WMN6T SMT
U104 M24C02-WMN6T SMT
U106 74LCX14MX S014 FAIRCHIL
U201 TL1451ACD
U202 A290011TL-70
U203 SCALER IC gm5120(V:BD)
U204 M24C16-MN6T
U301 THC63LVDM83R
U302 THC63LVDM83R
U501 AIC1117-33CY
U502 AIC1117-33CY
U503 RT9164-25CL
CN101 DVID CONN. 24P FEMALE
CN102 D-USB 15PIN
CN301 PIN HEADER 24P 2.0mm
CN402 PIN HEADER FEMALE 2*6
CN403 WAFER 14P RIGHT ANGLE
X201 CRYSTAL 14.318MHzHC-49U
M2 PHONE JACK