Acer B243W User manual

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Acer B243W
Service Guide

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Service Guide Version and Revision
Version Release Date Revision History TPV model
A00 Apr.-3-2008 Initial Release
TK7SMHDBW7AYBC/
TK7SMHDKW7AYBC

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Copyright
Copyright © 2008by AcerIncorporated. 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.
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.
Trademarks
Acer is a registered trademark of Acer Incorporated.
All other trademarks are property of their respective owners.
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 Remind 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 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.
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 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. Dangerous 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 manufacturer or sold
with the monitor. If you mount the monitor on a wall or shelf, uses 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. 5A.
zThe wall socket shall be installed near the equipment and shall be easily accessible.
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 on 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 Monitor Features ………………………………………… 7
Introduction ……………………………………… 7
Electrical Requirements ……………………………………… 8
LCD Monitor General Specification ……………………………………… 9
LCD Panel Specification ……………………………………… 10
Support Timing ……………………………………… 13
Monitor Block Diagram ……………………………………… 14
Main Board Diagram ……………………………………… 15
Software Flow chart ……………………………………… 16
Main Board Layout ……………………………………… 18
Installation ……………………………………… 19
Attaching/Removing the base ……………………………………… 21
Chapter 2 Operating Instructions ……………………………………… 22
External Controls ……………………………………… 22
Front Panel Controls ……………………………………… 22
eColor Management (OSD) ……………………………………… 23
How to Adjust a Setting ……………………………………… 24
LOGO ……………………………………… 27
Chapter 3 Machine Disassembly ……………………………………… 28
Chapter 4 Troubleshooting ……………………………………… 32
Chapter 5 Connector Information ……………………………………… 38
Chapter 6 FRU (Field Replacement Unit) List ……………………………………… 40
Exploded Diagram ……………………………………… 40
Chapter 7 Schematic Diagram ……………………………………… 45

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Monitor Features
Introduction
Scope
This specification defines the requirements for the 24” MICROPROCESSOR based Multi-mode supported high
resolution color LCD monitor. This monitor can be directly connected to general 15-pin D-sub VGA connector and
24-pin DVI connector, also supports VESA DPMS power management and plug & play function.
Description
The LCD monitor is designed with the latest LCD technology to provide a performance oriented product with no
radiation. This will alleviate the growing health concerns. It is also a space saving design, allowing more desktop
space, and comparing to the traditional CRT monitor, it consumes less power and gets less weight in addition MTBF
target is 50k hours or more.
Chart of B243W
Panel LTM240CT01 801(A01)
Signal Interface D-Sub 15-pin/ DVI 24-pin
Sync Type Separate / Compatible
Color Temp User Adjust Support
DDC DDC2B
Speaker No
Headphone Jack Yes
Microphone Jack No
USB Hub Yes
Tilt / Swivel Yes / Yes
Cha
p
ter 1

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Electrical Requirements
Standard Test Conditions
All tests shall be performed under the following conditions, unless otherwise specified.
Ambient light Dark room (< 1 cd/m2)
Viewing distance 35-50cm
Warm up time ＞30 minutes
Analog Input signal 700 mVss
Control temperature 6500°K
Brightness control Set to Factory preset value (cut off raster)
User contrast control
Set to The value under user mode, which allows that the brightest
two of 32 linear distributed gray-scales (0～700mv) can be
distinguished.
Picture position and size Factory preset value
Viewing angle 90°+/-20 ° H and 90°+/-10° V
AC Supply voltage 230V± 5％, 50±3Hz
Ambient temperature 20+5℃
Humidity 65% ±20%
Display mode 1920x1200, 60 Hz, all white
e-color mode Set to “User” mode
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

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LCD Monitor General Specification
Driving system TFT Color LCD
Active Display Area 518.4(H) x 324.0(V)
Pixel pitch 0.270(H) x 0.270(W)
Contrast Ratio 1000 : 1
Response time 5ms
LCD Panel
Luminance of White 400(Typ.) cd/㎡
Separate Sync. H/V TTL
H-Frequency 30kHz – 80kHz
Input
V-Frequency 56-76Hz
Viewing angle (H)160 (V) 160(Type)
Display Colors 16.7M
Display mode 1920 x 1200 @60Hz
ON Mode < 118W
EPA ENERGY STAR®
OFF Mode < 1W
Contrast control Set to factory preset value, which allows that the brightest two of 32 linear distributed
gray-scales (0～700mv) can be distinguished.
Power Source 90 V ~ 240 V，50 ±3Hz, 60 ±3Hz
Environmental
Considerations
Operating Temp: 0° to 40°C
Storage Temp: -30° to 65°C
Operating Humidity: 0% to 90%
Storage Humidity: 0% to 90%
Peak surge current < 100 A peak at 230 VAC and cold starting&25℃& DC Output at Full-load
Power line surge No advance effects (no loss of information or defect) with a maximum of 1 half-wave
missing per second

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LCD Panel Specification
LTM240CT01 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT (Thin Film
Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back light
unit. The resolution of a 24.0” is 1920 x 1200 and this model can display up to 16.7 millions colors.
General Specifications
Mechanical Information

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Electrical Characteristics

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Optical Specifications

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Support Timing
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
+/- 0.5KHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
VGA
640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500
800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000
SVGA
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@72Hz 1304x798 57.7 P 72 P 78.4
XGA
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
1152x864@75Hz 1600X900 67.5 P 75 P 108.000
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
1280x1024@70Hz 1688x1066 74.4 P 70 P 124.9
1280x1024@72Hz 1688x1066 77.9 P 72 P 134.6
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
SXGA
1280x960@60Hz 1800x1000 60 P 60 P 108
1440x900@60Hz 1904x934 55.93 P 60 P 106.5
WSXGA 1680x1050@60Hz 2240x1089 65.29 N 59.95 P 146.25
WUXGA 1920*1200@60HZ 2080*1235 74.038 P 59.95 N 154.00
UXGA 1600x1200@60Hz 2160x1250 75 P 60 P 162

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Monitor Block Diagram
The LCD MONITOR will contain a main board, an inverter board, an adapter board, a key board and a USB board
which house the flat panel control logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Main Board
Flat Panel and
CCFL Backlight
Video Signal, DDC
Adapter Board
RS232 Connector
For white balance
adjustment in factory
mode
HOST Computer
CCFL Drive
Key Board
Inverter Board
AC input
USB Board

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Main Board Diagram
MCU
MTV416GMV
(U407)
Scalar IC MST9200HA-LF-165
(Include ADC, OSD)
(U403)
EEPROM
M24C16
(U408)
D-Sub
Connector
(CN402)
EEPROM
M24C02
(U402)
H sync
V sync
RGB
DB15_SDA,
DB15_SCL
EPR_SDA
EPR_SCL
LCD Interface
(CN703)
Key Board
Control
(CN405)
DVI
Connector
(CN401)
EEPROM
M24C02
(U401)
Digital
Video
Signal
FRAME
MEMORY
(U404)
Crystal 14.318MHz
(X401)
Crystal
24MHZ/30PF/49US
(X402)

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Software Flow Chart
N
Y
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

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Remark:
1) MCU initializes.
2) Is the EEPROM blank?
3) Program the EEPROM by default values.
4) Get the PWM value of brightness from EEPROM.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEPROM.
Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the
message disappears.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

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Main Board Layout
Symbol Description Symbol Description
CN402 D-SUB 15PIN U403 IC MST9200HA-LF-165 PQFP-208
CN401 DVI 24PIN CONN F U701 IC AIC1084-33PMTR-R AIC
CN703 WAFER 30P 2.0MM DIP DUAL ROW U702 IC AIC1084-33PMTR-R AIC
CN701 WAFER 14P RIGHT ANGLE PITCH U404 IC EM636165TS-5G 16M TSOPII-50 ETRON
CN405 WAFER 6P RIGHT ANGLE PITCH 2.0 U405 IC EM636165TS-5G 16M TSOPII-50 ETRON
U407 MTV416GMV U401 M24C02-WMN6TP
U402 M24C02-WMN6TP U408 M24C16-WMN6TP
X402 24MHZ/30PF/49US X401 XAT01431AFI1H-3OHX AT-49 14.31818MHZ

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Installation
To install the monitor on your host system, please follow the steps below:
Steps
1.Connect the video cable
A: Make sure both the monitor and computer are switched off.
B: Connect the VGA video cable to the computer.
C: Connect the digital cable (only for dual-input models).
(1) Make sure both the monitor and computer are switched off.
(2) Connect one end of the 24-pin DVI cable to the back of the monitor and the other end to the computer's port.
2.Connect the power cord
Connect the power cord to the monitor, then to a properly grounded AC outlet.
3.Turn on the monitor and computer
Turn on the monitor first, then the computer. This sequence is very important.
4.If the monitor does not function properly, please refer to the troubleshooting section to diagnose the problem.

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Attaching/Removing The Base
Install: Align the base with the stand and push the base towards the top of the monitor, and then rotate the base
clockwise. Tighten the screw clockwise.
Remove: Reverse the steps to remove the base.
Screen Position Adjustment
In order to optimize the best viewing position, you can adjust the height/tilt/swivel/pivot of the monitor.
Height Adjustment
After pressing the top of the monitor, push the lock button towards right, then you can adjust the height of the
monitor.