Acer B243W User Manual

Acer B243W

Service Guide

Service Guide Version and Revision

Version Release Date Revision History TPV model

A00 Apr.-3-2008 Initial Release

TK7SMHDBW7AYBC/

TK7SMHDKW7AYBC

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.

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.

Precautions

z Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in

a wet basement.

z 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 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.

z Slots 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.

z 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.

z 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.

z 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.

z Do not overload power strips and extension cords. Overloading can result in fire or electric shock.

z 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.

z 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

z To ensure satisfactory operation, use the monitor only with UL listed computers which have appropriate

configured receptacles marked between 100 - 240V AC, Min. 5A.

z The 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

z 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.

z You may find slightly uneven brightness on the screen depending on the desktop pattern you use.

z 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.

z 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.

Table Of Contents

Chapter 1 Monitor Features ………………………………………… 7

Chapter 2 Operating Instructions ……………………………………… 22

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

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

Chapter 7 Schematic Diagram ……………………………………… 45

Exploded Diagram ……………………………………… 40

Monitor Features

Chapter 1

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

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

Analog Input signal 700 mVss

Control temperature

Brightness control Set to Factory preset value (cut off raster)

User contrast control

Picture position and size Factory preset value

Viewing angle 90°+/-20 ° H and 90°+/-10° V

AC Supply voltage

Ambient temperature 20+5℃

Humidity

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

＞30 minutes

6500° K

Set to The value under user mode, which allows that the brightest

two of 32 linear distributed gray-scales (0～ 700mv) can be

distinguished.

230V± 5％, 50±3Hz

65% ± 20%

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)

LCD Panel

Contrast Ratio 1000 : 1

Response time 5ms

Luminance of White

Separate Sync. H/V TTL

Input

Viewing angle (H)160 (V) 160(Type)

Display Colors 16.7M

Display mode 1920 x 1200 @60Hz

EPA ENERGY STAR®

Contrast control

Power Source

H-Frequency 30kHz – 80kHz

V-Frequency 56-76Hz

ON Mode < 118W

OFF Mode < 1W

Set to factory preset value, which allows that the brightest two of 32 linear distributed

gray-scales (0～ 700mv) can be distinguished.

90 V ~ 240 V，50 ± 3Hz, 60 ± 3Hz

400(Typ.) cd/㎡

Operating Temp: 0° to 40°C

Environmental

Considerations

Peak surge current < 100 A peak at 230 VAC and cold starting&25℃ & DC Output at Full-load

Power line surge

Storage Temp: -30° to 65°C

Operating Humidity: 0% to 90%

Storage Humidity: 0% to 90%

No advance effects (no loss of information or defect) with a maximum of 1 half-wave

missing per second

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

Electrical Characteristics

Optical Specifications

Support Timing

VESA MODES

Horizontal Vertical

Nominal

Mode Resolution Total

640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175

VGA

SVGA

XGA

1152x864@75Hz 1600X900 67.5 P 75 P 108.000

SXGA

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

640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500

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

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

1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750

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

1280x960@60Hz 1800x1000 60 P 60 P 108

Frequency

+/- 0.5KHz

Sync

Polarity

Nominal

Freq.

+/- 1 Hz

Sync

Polarity

Nominal

Pixel

Clock

(MHz)

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.

Inverter Board

CCFL Drive

Flat Panel and

CCFL Backlight

Adapter Board

Main Board

RS232 Connector

For white balance

adjustment in factory

mode

AC input

Key Board

USB Board

Video Signal, DDC

HOST Computer

Main Board Diagram

Crystal

24MHZ/30PF/49US

(X402)

MTV416GMV

(U407)

EPR_SDA

EPR_SCL

EEPROM

M24C16

(U408)

Key Board

Control

(CN405)

MCU

LCD Interface

(CN703)

Scalar IC MST9200HA-LF-165

(Include ADC, OSD)

H sync

V sync

RGB

Digital

Video

Signal

(U403)

Crystal 14.318MHz

(X401)

DVI

Connector

(CN401)

D-Sub

Connector

(CN402)

DB15_SDA,

DB15_SCL

FRAME

MEMORY

(U404)

EEPROM

M24C02

(U401)

EEPROM

M24C02

(U402)

Software Flow Chart

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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