Acer at3247, at3248 Service Manual

Acer AT3247 & AT3248

Service Guide

Service Guide Version and Revision

Version Date Revision History Customer Name TPV Model Name

A00 Aug.-18-09 Initial release

AT3247 E329G2NBWAZE2N

AT3248 E329G2NBWAZF2N

This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to any electronic machine readable form without prior written permission of Acer Technology Corp. ACER AT3247 & AT3248 Service Manual.

Printed in Fijian.

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.

Trademarks

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 TV Monitors

The following symptoms are normal with LCD TV 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 TV 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 TV 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

Monitor Features

General Specifications ……………………………………… 7 LCD TV Description ……………………………………… 9

Chapter 1

Chapter 2

Chapter 3

Chapter 4 Machine Disassembly

Precautions And Notices ……………………………………… 9 D-SUB PIN Distribution ……………………………………… 10 Factory Preset Display Modes ……………………………………… 11 LCD TV Panel Specification ……………………………………… 12 Panel Features ……………………………………… 12 General Specifications ……………………………………… 12 Mechanical Specifications ……………………………………… 12 Optical Specifications ……………………………………… 13

Connecting Peripherals

Front Panel Controls ………………………………………….. 14

Remote Control & OSD Operating Instructions

Using The Remote Control ……………………………………… 15

Using The OSD Menus 17 LOGO ……………………………………… 25

……………………………………… 7

……………………………………… 14

…………………………………………………. 15

……………………………………… 26

Chapter 5 Trouble Shooting

Chapter 6 Upgrade Firmware

Chapter 7 White-Balance, Luminance Adjustment

FRU (Field Replaceable Unit) List

Chapter 8

Chapter 9 PCB Layout

Chapter 10 Schematic Diagram

Exploded Diagram ……………………………………… 41

EDID Data ……………………………………… 46

……………………………………… 33

……………………………………… 37

……………………………………… 39

……………………………………… 41

……………………………………… 47

……………………………………… 51

Monitor Features

Chapter 1

General Specifications

558.62 mm

782.55 mm

AT3247/48

94.5 mm

510.25 mm

449.16 mm

209.34 mm

LCD TV Description

The LCD TV will contain a main board (include audio), a switching power board, a function keyboard, an IR Board

and a side board. The main board and power board will house the flat panel to control logic I2C bus, DDC,

brightness control logic for LCD panel, DC-DC conversion to supply the appropriate power to the whole board and

transmitting TTL level signals into LCD Module to drive the LCD display circuit.

The inverter board will drive the five CCFLs (Cold Cathode Fluorescent Lamp).

The switching power board will provides the power ON/OFF to control the TV and control LED indicator for DPMS.

The function keyboard and Remote Control will provide the OSD control signal to the Main Board.

Precautions and Notices

1-1 Assembly Precaution

(1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface

by touching with bare hands (Polarize film, surface of LCD panel is easy to be flawed)

In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display

characteristic and reliability. If this panel is subject to hard pressing, the following occurs :

(a) Uniform color (b) Orientation of liquid crystal becomes disorder

(2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of it being soiled.

(3) Please wipe out drops of adhesive like saliva and water in LCD panel surface immediately.

They might damage to cause panel surface variation and color change.

(4) Do not apply any strong mechanical shock to the LCD panel.

1-2 Operating Precaution

(1) Please be sure to unplug the power cord before remove the back-cover. (be sure the power is turn-off)

(2) Please do not change variable resistance settings in MAIN-BOARD; they are adjusted to the most suitable

value. If they are changed, it might happen LUMINANCE does not satisfy the white balance spec.

(3) Please consider that LCD backlight takes longer time to become stable of radiation characteristic in low

temperature than in room temperature.

(4) Please pay attention to displaying the same pattern for very long-time. Image might stick on LCD.

1-3 Storage Precaution

(1) When you store LCD for a long time, it is recommended to keep the temperature between -20°C - 60°C

without the exposure of sunlight and to keep the humidity less than 85% RH.

(2) Please do not leave the LCD in the environment of high humidity and high temperature such as 60°C,

95%RH.

(3) Please do not operate the LCD in the environment of abnormal temperature, below 0°C.

1- 4 High Voltage Warning

The high voltage was only generated by Power support part, if carelessly contacted the transformer on this

module, can cause a serious shock.

D-SUB PIN Distribution

This procedure gives you instructions for installing and using the LCD TV display.

(1) Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire

power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to

the electrical conduct ground. If the AC outlet in your location does not have provisions for the grounded type

plug, the installer should attach the proper adapter to ensure a safe ground potential.

(2) Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws on the

connector to ensure firm grounding. The connector information is as follow:

15 - Pin Color Display Signal Cable

Pin NO. Description Pin NO. Description

1 Red video input 9 DDC +3.3V (or 5V)

2 Green video input /SOG 10 Logic ground

3 Blue video input 11 GND

4 GND 12 Serial data line (SDA)

5 GND– cable detect 13 H. Sync / H+V

6 Red video ground 14 V. Sync

7 Green video ground 15 Data clock line (SCL)

8 Blue video ground

Factory Preset Display Modes:

VGA/HDMI Input Signal Reference Chart

LCD TV Panel Specification

The LC320WXE is a Color Active Matrix Liquid Crystal Display with an integral External Electrode Fluorescent Lamp(EEFL) backlight system. The matrix employs a-Si Thin Film Transistor as the active element. It is a transmissive type display operating in the normally black mode. It has a 31.51 inch diagonally measured active display area with WXGA resolution (768 vertical by 1366 horizontal pixel array). Each pixel is divided into Red, Green and Blue sub-pixels or dots which are arranged in vertical stripes. Gray scale or the luminance of the sub-pixel color is determined with a 8-bit gray scale signal for each dot, thus presenting a palette of more than

16.7M(true) colors.

General Specifications

Electrical Characteristics

Optical Specifications

Ta= 25±2°C, VLCD=12.0V, fV=60Hz, Dclk=72.4MHz, IBL=93mArms

Connecting Peripherals

Front panel controls

Chapter 2

Remote Control & OSD Operating instructions

Chapter 3

Using the Remote Control

5 e (Empowering Technology)

Press to activate Acer Empowering Technology.

6 MENU

Press to open or close the Menu.

7 Back

Press to back to previous Menu.

8 Directional keys/OK

9 MPX

Press to select the audio type, displayed in the top right-hand corner(mono, stereo, bilingual).

10 EPG

Press to launch Electronic Programme Guide (EPG) mode (Digital TV mode only).

11 MUTE

Press to toggle audio on and off.

12 DISPLAY

Press to display or change input/ channel information (dependent on input/source type).

13 CH LIST

1 POWER

Press to turn your TV on/off.

2 SLEEP

Press to set a time period after which the TV will switch itself to standby ( 5, 30, 45, 60, 90 or 20 minutes).

3 Input buttons (TV/AV/SCART/PC)

Press to select correct input mode.

4 WIDE

Press to toggle scaling mode between Wide detect, 4:3, 6:9, Full*, Panorama and Letterbox , 2, 3 modes.

Press to launch the channel list. See page 40.

14 VOL (+/-)

Press to increase or decrease the volume.

15 CH (up/down)

Press to sequentially select the TV channel.

16 Sound

Press to turn audio mode to Surround mode.

17 Number keys.

18 RECALL

Press to return to the previous channel.

19 ENTER

Press to confirm channel number selection.

Teletext

1 Color buttons (R/G/Y/B)

Operates corresponding button on the teletext page.

2 INDEX

Press to go to the index page.

3 SUBTITLE

Press to view subtitles on the screen.

4 REVEAL

Press to reveal hidden teletext information.

5 SUBPAGE

Press to access the teletext’s subpages directly.

6 SIZE

Press once to zoom teletext page to 2X.

Press again to resume.

7 TTX/MIX (TELETEXT/MIX)

Press to switch from TV/AV to Teletext mode.

Press to overlay teletext page on the TV image.

8 HOLD

Press to pause the current teletext page in multi-page viewing mode. When watching TV, press to freeze the image

on the screen.

Using the OSD Menus

+ 47 hidden pages