Acer AT1921 User manual

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Acer AT1921/22
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%RecycledPaper

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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 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.

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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® 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
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
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.
zSlots 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.
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

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SPECIAL NOTES ON LCD MONITORS
The following symptoms are normal with LCD monitor and do not indicate a problem.
NOTES
zDue 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.
zYou may find slightly uneven brightness in the screen depending on the desktop pattern you use.
zThe 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.
zDue 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 LCD TV FEATURE………………………………………………………………………....9
Chapter 2 OPERATING INSTRUTION ………………………………………………………..20
Chapter 3 MACHINE ASSEMBLY………………………………………………………………...25
Chapter 4 TROBLE SHOOTING…………………………………………………………………...39
Chapter 5 CONNECTOR INFORMATION…………………………………………………...42
Chapter 6 FRU LIST……………………………………………………………………………………...43
Chapter 7 SCHEMATIC DIAGRAM ……………………………………………………………..45

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Chapter 1
LCD TV Feature
Destination Europe
Color System CCIR B/G, D/K, I and L/L’
Sound System Sound 1 and Sound 2
Stereo System NICAM and FM Stereo ( A2 )
Channel System Full frequency range from channel E2
( 48.25 MHz ) to channel E69 ( 855.25
MHz)
Sub-Title Teletext 100 pages
TV System RF-AFT (+ / - 1.5MHz)
Maximum Resolution 1440*900
Panel Supplier AUO: M190PW01_V0
Lamp Quantity CCFL*4
Display Area 19" Wide Diagonal
Display Color 16.7 M colors (RGB 6 bits+HiFRC)
Contrast Ratio 800:1 (Typical)600:1(Min)
Brightness 300 cd / m*2 (Typical)
Response Time 5 ms(Typ)
LCD Panel View Angle 80°(L)/80°(R), 80°(U)/80°(D)
HDMI For Audio & Video
RCA Jack *3 For Audio & Video
Din Jack For S-Video
SCART*1 21 Pin for Video ,S-Video & RGB
PH Jack For TV Input ( PAL system)
Earphone Jack For Audio Output
SPDIF For Audio output (I2S)
3.5mm Stereo Jack For PC Stereo Audio Input , Black color
I / O Functions D-Sub-15 For VGA
Support PAL / NTSC / SECAM video
format
Support 480 i , 480 p,720P,1080i format
Build in motion adaptive 3D digital Comb
Filter
Video Functions
Build in Teletext Functions

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TV System PAL and SECAM system Receivable
Tuner FQ1216-MK5
Horizontal input frequency range : 30~71
KHz
Vertical input frequency range : 50~85 Hz
VGA Maximum resolution : 1440*900
Out of Range
When input signal is out of range or
down scaling support ,the OSD will show
"Out of Range "within 5 seconds and LED
is green
Input Signal No Signal
When there is missing signal from
selected input ,the OSD will show "No
Signal "within 8 seconds and LED is green
Standard x=300 , y=310, Y>250cd / m*2(center)
Warm x=317 , y=327, Y>250cd / m*2(center)
Color
Temperature Cold x=285 , y=293, Y>220cd / m*2(center)
Key count 43 Keys
Effective Distance More than 5 m +45~-45degreeRemote
Controller Supplier Panasonic
Local Control
Key 7 Keys
Power, Left, Right, Up, Down, Menu,
Select
Display Area: 19W inches diagonal
H-Phase: A-B Less than 1.5mm
V-Center: C-D Less than 1.5mm
Tilt: E-F Less than 1mm
Display Area &
Tilt
Speaker
Internal speaker. 5W*2 stereo, volume
adjustable.
Treble, Bass ( + 6db)
Audio
Frequency Response 100~15KHz with +/-3 db variation
A
E
D
CF
B

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THD(Total Harmonic D distortion) Limited to 5 % at 2W (at 0.1~15 KHz)
OSD Capability On screen display adjustment function
ISP Functions
ISP (In System Programming) function
available for revising driver easily.
Input Voltage 90 ~ 264 V , 47 ~ 63 Hz
Input Current 0.6~1.5 A
Max. Power
58 Watts(not support Energy Star max
power SPEC)
PC saving Power 2Watts Max
Power Source Stand-By Power(AV,TV) 1 Watts Max.
Mechanical VESA Mount 100*100 mm
Input & Output Signal Specification
Type Analog
Polarity Positive
Level 1Vp-p ( with Sync.)
Impedance 75Ω± 5%
CVBS Input Interface RCA jack, Yellow color
Type Analog
Polarity Positive
Level Y : 1Vp-p ( with Sync.) , C : 0.286Vp-p
Impedance 75Ω± 5%
S-Video Input Interface DIN Jack
Type Analog
Polarity Positive
Impedance 75Ω± 5%
SCART Input Interface 21 Pin Euro-SCART
Type Stereo R/L Channels
Level 500mVrms
Impedance More than 22kΩ
Interface RCA Jack
Right channel Red color.
Audio Input Left Channel White color
Type Stereo R/L ChannelsPC Stereo Input
Level 1Vrms

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Impedance More than 22kΩ
Interface 3.5mm Stereo Jack , Black color
Type Stereo R/L Channels
Level 40mW rms/per Channel(typ.) for 32 ohm earphone
Impedance 32 ohm
Headphone Output Interface 3.5mm Stereo Jack
Max. Audio output 5W + 5W (at 1.0Vp-p / 1kHZ input,10% THD max.)
Sound Distortion 1% THD max. ( at 250mW/1kHZ : )
Speaker 5 W / 8 ohms
Speaker Impedance 8 ohms at 1kHZ
Residual Hum 500uW Max.( at Min. Volume : )
Built-in Speaker Max. Hum 1000uW Max ( at Max. Volume )
Type Stereo R/L Channels
Level 400Vrms.
Audio Line Output Interface 3.5mm Stereo Jack
Input Impedance 75 ohms
Frequency Range 48.25~855.25 MHz (PAL)
Video S/N Ratio 45 d B (Typical)
RF Input Audio S/N Ratio 63 d B (Typical)
Level : Low = 0 to 0.8V, High = 2.0 to 5 V
Polarity : Positive or Negative
Sync Impedance : 1 k ohm or higher
Level : 0 to 700mV Positive
VGA Input RGB Signal Impedance : 75Ω± 5%
1 Red Video
2 Green Video
3 Blue Video
4 Ground
5 Ground
6 Red Ground
7 Green Ground
8 Blue Ground
9 +5V ( PC97 )
10 VGA-CONN(Sync GND)
11 Ground
12 SDA ( DDC Data )
13 Horizontal Sync
14 Vertical Sync
D-Sub Pin Define 15 SCL ( DDC Clock )

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PC Timing Mode
Pixel Hor. Freq. Hor. Vert.
Freq.
Vertical
Standard Format
Format (kHz) Polarity (Hz) Polarity
1 640*350 31.5 70 VGA
2 720*400 31.47 - 70 + VGA
3 640*480 31.47 - 60 - VGA
4 640*480 35 66.7 MAC
5 640*480 37.861 - 72 - VESA
6 640*480 37.5 - 75 - VESA
7 640*480 43.3 - 85 - VESA
8 800*600 35.156 - 56 + VESA
9 800*600 37.879 + 60 + VESA
10 800*600 48.077 + 72 + VESA
11 800*600 46.875 + 75 + VESA
12 800*600 53.674 + 85 + VESA
13 832*624 49.72 74.5 MAC
14 1024*768 48.36 60 VESA
15 1024*768 56.48 70 VESA
16 1024*768 60.02 75 VESA
17 1280*720 44.772 - 59.86 + VESA 16:9
18 1280*720 56.456 - 74.78 + VESA 16:9
19 1360*768 47.72 - 59.8 + VESA 16:9
20 1360*768 60.288 - 74.89 + VESA 16:9
21 1440*900 55.935 - 59.89 + VESA 16:9
cancel
1440*900 70.635 - 74.98 + VESA 16:9

MT8200
Audio
Processor
MT8291
Audio
Amplifier
TFA9810
Backlight
LCD
panel
EEPROM
Flash
ROM
IR
Sensor
2-Wire Bus
SCART
S-video
Video
Tuner
PC PC Audio input
CVBS/S-Video Audio input
SCART Audio input
Tuner Audio input
SCART Audio output
S-Video input
CVBS input
PC Video input
Tuner Video input LVDS
SCART-RGB input
SCART-S-VIDEO input
SCAR-CVBS input
ADC+
GPIO
Earphone
2-Wire Bus
Speaker
DDC
EEPROM
HDMI
DDC
EEPROM
I2S Bus
HDMI receiver
MT8293
HDCP
Keys
16bit 4:2:2 MTK format
User
Keypad
SPDIF
2-Wire Bus
DDRAM
GPIO
RS232
Monitor Block Diagram

PCB CONDUCTOR VIEW
MAIN BOARD

BUTTON BOARD

USB BOARD

POWER 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.
BUTTON OSD On OSD Off
1 Power Software On / Off
2
Menu /
Exit
Press this button to open the OSD or Enter
function
3
CH Up Press CH Up key to move selection up Press these buttons to select the TV channel
in sequence.
4
CH Down Press CH Down key to move selection
down
Press these buttons to select the TV channel
in sequence.
5
Vol Left Press Vol Left key to move selection left or
to decrease value
Press these buttons to select the volume
level.
6
Vol Right Press Vol Right key to move selection
right or to increase value
Press these buttons to select the volume
level.
7
Input /
OK
Press this button to confirm selection Press this button to select the input source:
ATV -->AV-->S-Video-->SCART
-->HDMI--->VGA--> Back to ATV
PS: PS: SCART: RGB/S-Video/CVBS
Remote Controller Key Definition
Item Key Function
1 POWER Power On/Off
2 Mute Mute on/off
3 SLEEP Into sleep mode: Timer Off / 15 / 30 / 45 / 60 / 90 / 120 (minutes)
4 Display Pressing "Display" shows the source information
5 TV ATV
6 SCART SCART
7 AV (AV/S-Video/HDMI)
8 PC VGA
9 1 Number key 1