Acer AL1921h User manual

Acer AL1921h
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 © 2004 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.

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
Mechanical Specification …………………………………………… 20
Front Bezel …………………………………………… 23
Rear Bezel …………………………………………… 24
Chapter 2 Operating Instructions ……………………………………………. 25
External Controls …………………………………………… 25
Front Panel Controls …………………………………………… 25
OSD Menu …………………………………………… 27
Hot-Key Menu …………………………………………… 30
OSD Message …………………………………………… 30
LOGO …………………………………………… 31
Update the firmware …………………………………………… 32
Chapter 3 Machine Disassembly ……………………………………………. 43
Chapter 4 Troubleshooting ……………………………………………. 45
Chapter5 ConnectorInformation ……………………………………………. 51
Chapter 6 FRU (Field Replacement Unit) List ……………………………………………. 52
Exploded Diagram …………………………………………… 52
Chapter7 SchematicDiagram ……………………………………………. 54
Analog and Digital Input …………………………………………… 54
MST8131B …………………………………………… 54
LVD-S …………………………………………… 55
Key Board Connector …………………………………………… 56
Audio …………………………………………… 57
DC Power 57
Appendix Online Support Information ……………………………………………. 58
Table Of Content
s

8
Monitor Features
AU EN02 SEC E1-L01
Driving
system TFT Color LCD TFT Color LCD
Size 48cm(19.0") 48cm(19.0")
Pixel pitch 0.294mm( H )x 0.294mm( V ) 0.294mm( H )x 0.294mm( V )
Brightness 250cd/m2(Typical) 250cd/m2(Typical)
Contrast 700:1(Typical) 500:1(Typical)
Viewable
angle 170°(H) 170°(V) 170°(H) 170°(V)
LCD Panel
Response
time 25ms(Tr+Tf ),Tr=15ms,Tf=10ms 25 ms(Tr+Tf)Tr=15ms/Tf=10ms
R,G,B Analog Interface
Video
Digital Digital
Separate
Sync. H/V TTL H/V TTL
H-Frequency 30KHz – 80KHz 30KHz – 80KHz
Input
V-Frequency 55-75Hz 55-75Hz
Display Colors 16.7M Colors 16.7M 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 ≤60W ≤60W
EPA ENERGY
STAR®OFF Mode ≤5W ≤5W
D-Sub 15pin D-Sub 15pin
Input Connector DVI-D 24pin 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
Display Size Horizontal : 376.32mm
Vertical : 301.056mm
Horizontal : 376.32mm
Vertical : 301.056mm
Power Source
Environmental
Considerations
100~240VAC,47~63HZ
Operating Temp: 5° to 50°C
Storage Temp.: -20° to 65°C
Operating Humidity: 10% to 85%
100~240VAC,47~63HZ
Operating Temp: 5° to 50°C
Storage Temp.: -20° to 65°C
Operating Humidity: 10% to 85%
Dimensions 404.2(w)x330(H)x20(D) 404.2(w)x330(H)x20(D)
Weight (N. W.) 4.2kg 4.2kg
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
•(Warm) Color
•(Cool)Color
•RGB Color temperature
•Reset
•OSD timeout
•information
•Exit
•Contrast
•Brightness
•Focus
•Clock
•H-Position
•V-Position
•Input Selected
•Language
•(Warm) Color
•(Cool)Color
•RGB Color temperature
•Reset
•OSD timeout
•information
•Exit
Power Consumption
( Maximum ) 60 60 Watts
Audio Output Rated Power 2.5W rms (Per
channel)
Rated Power 2.5W 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: 19 “ active matrix color TFT LCD
1). AU EN02
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) standard resolution
Pixel pitch: 0.294mm(H) ×0.294mm(V)
Display dot: 1280 x (RGB) ×1024
Pixel clock: 25.2 – 135.0MHz
Contrast ratio: θ= 0° AU EN02 700:1
Brightness: AU EN02 250 cd/㎡
Response time (Tr/Tf): AU EN02 (25ms)
Display color: 16.7M(RGB 8 bit Data)
Viewing angle: AU EN02 L / R ≧85/ ≧85 (≧160 degrees horizontal typical)
U / D ≧75 / ≧75(≧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: 60 Watt max.

12
LCD Panel Specification
LCD Panel Model (SEC E1-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
LampCurrent 7.0mArms(typ)
 Weight 2750g (typ)
 Optical Specifications
IL= 6.5mArms Ta= 25 ±2°C VDD =5V F
V= 60Hz FDCLK = 54MHz
ITEM Symbol Condition MIN. TYP. MAX. UNIT
Contrast Ratio
(Center of screen) CR 400 500 -
Rising TR-
15 20-
Response
Time at Ta Falling TF-
10 15
msec
Luminance of white
(Center of screen) YL220 250 -cd/mm
RX0.634
Red RY0.354
GX0.304
Green GY0.581
BX0.143
Blue BY0.102
WX0.310
Color
Chromaticity
(CIE)
White WY
θ=0,
φ=0
Normal
Viewing
Angle TYP.
-0.03
0.330
TYP.
+0.03
θL-80 -
Hori. θR70 85 -
φH70 85 -
Viewing
Angle Vert. φL
CR≥10
70 85 -
Degrees
Brightness Uniformity BUNI 70 85 80 %
Flicker F --25 %
Luminance
Uniformity(TCO99) LR --1.7

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
 Display Color same as LCD panel
Sync input
 Signal separate horizontal and vertical sync, or composite sync
which are TTL compatible
 Polarity positive and negative.
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 --83KHz
 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 96 840 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 [phone] 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
PWPC
LAMP
LCD PANEL
AUDIO
ANALOG IN LCD Controller
-Scaler
-OSD
-LVDS IC
-ADC
DC-DC
MCU
AUDIO IN
POWER(90V-264V)

16
RGB
U601
Winbond
RXD/TXD
KEY Control
AT24C16
U602
EPR SDA/SCL
Panel
PA 0~9
PB 0~9
VLCD
U401
MST 8131B
HS/VS
VAA3VCC2.5V
VCC3.3V
VAA1
VAA4
VAA2
AT24C02
(DDC)U301
DDC SCL/SDA
VGA Input
VGA R/G/B
VGA Hsync/Vsync
MAIN BOARD DIAGRAM
AT24C02
(DDC)U302
DVI
Signal

17
Software Flow Chart
1) MCU initialize.
2) Is the eeprom blank?
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?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Saving the power key status into eeprom.
Turn on the LED and set it to green color.
Scalarinitializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog and digital port, are there
any signals coming?
13) Does the scalar send out a interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog or
digitalport?
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)ProcesstheOSDdisplay.
19) Read the keyboard. Is the power key pressed?
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18

18
Monitor Board Layout

19
Label Component
U201 RT9164-25CL
U202 AIC1084-33CM
U301 M24C02-WMN6T SMT
U302 M24C02-WMN6T SMT
U401 MST8131B PQFP-12
U602 AT24C16N-10SC-2.7
U603 MAX810STR SOT-23
U601 W78E65P-40
X401 CRYSTAL 14.318MHzHC-49US
X601 20MHZ
CN201 WAFER 2*6P 2.0MM R/A
CN601 PIN HEADER 2*7P 2.0mm
CN602 WAFER 16PIN 2.0mm DIP
CN503 PIN HEADER 24P 2.0mm
CN301 88L 35315F HS
CN302 DVID CONN 24P