Acer AT4250-DTV User manual

Acer AT4250DTV LCD TV
Service Guide
PRINTED IN TAIWAN
Service guide files and updates are
available on the ACER/CSD web. For
more information, please refer to http://
csd.acer.com.tw

II
Revision History
Please refer to the table below for the updates of LCD TV AT4250DTV service guide.
Date Chapter Updates
December 11, 2006 initial release

III
Copyright
Copyright© 2006 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.

IV
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 Incorporated.
Other brand and product names are trademarks and/or registered trademarks of their respective
holders.

V
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.

VI
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, you should check the most up-to-date information
available on your regional web or channel. For whatever reason, if 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.

Chapter 1 1
Overview
LCD Panel
•Max. resolution: 1920 x 1080
•20 CCFTs backlight system
•Display area: 42 inches
•Display color: 16.7 million colors
•Input signal: two-channel LVDS
•Contrast ratio: 1200/1 (typical)
•Brightness: 500 Cd/m2(typical)
•Response time: 6.5 ms
•Viewing angle: 88o(L)/ 88o(R), 88o(U)/ 88o(D)
I/O Functions
•21-pin Euro-SCART (RGB) for Video, S-Video, R.G.B. and Audio
•RCA jack (YUV and CVBS) for YPbPr, YCbCr, Video and Audio
•15-pin D-sub for VGA
•19-pin HDMI connector
•DIN45325 (IEC169-2) terminal for TV/CATV input
•DIN45325 (IEC169-2) terminal for DVB-T input
Video Functions
•PAL/NTSC/SECAM video format support
•480i/576i, 480p/576p, 1080i and 720p, 1080p format support
•Built-in Teletext functions
•Built-in dynamic adaptive smoothing filter
•Built-in dynamic temporal frame-filter noise reduction
•Built-in dynamic motion and edge adaptive de-interlacing
•Film mode 3/2 & 2/2 pull down
•Screen display model 16/9 & 4/3 & panorama & zoom
Mechanical
•VESA mounting holes
Multi-Sound System
•NICAM
•FM Stereo (A2)
Power Source
•Input voltage: 90~264V, 47~63Hz
•Input current: 2.71A
•Power consumption: 291W
System Specification
Chapter 1

2Chapter 1
•Stand-by: 5W Max.
Remote Control
•Multi-function remote control
Speaker
•Internal speaker: 10W x 2 stereo, adjustable volume
Others
•On-screen display adjustment function
•ISP (In System Programming) function available for revising driver easily

Chapter 1 3
System Block and Wiring Diagram

4Chapter 1
LCD Main Board Block Diagram

Chapter 1 5
Front Panel View
#Item
1 AV4-Audio L/R + CVBS
2 Power On/Off
3 Menu key
4 Channel up/down
5 Volume +/-
6 Input key
#Item Description
3 Menu key Turns the OSD menu ON and OFF.
4 Channel up When the OSD is on, functions the same
as the Up arrow.
Channel down When the OSD is on, functions the same
as the Down arrow.
5 Volume up When the OSD is on, functions the same
as the Right arrow.
Volume down When the OSD is on, functions the same
as the Left arrow.
6 Input key When the OSD is on, press this button to
confirm selection.

6Chapter 1
Rear Panel View
Note: For AV3, Composite and component inputs share the same audio ports.
#Item #Item
1 Power switch 2 AC-in
3 HDMI 4 VGA-in
5 PC Audio-in 6 AV3-Audio L/R + CVBS
+ COMPONENT *
7 SCART 8 Analog antenna/ Digital
antenna

Chapter 1 7
Remote Control
General Keys
Teletext
#Item Description
General Keys
1 POWER Press to turn your TV on/off.
2 DISPLAY Press once to display input/channel information (dependent
on input/source type). Press twice to show more
information.

8Chapter 1
3 MUTE Press to toggle audio on and off.
4 Input buttons (TV/ AV/
SCART/ PC)
Press to select correct input mode.
5-1 SLEEP Press to set a time period after which the TV will switch itself
to standby (15, 30, 45, 60, 90 or 120 minutes).
5-2 EPG Press to launch Electronic Programme Guide (EPG) mode
(digital TV mode only).
5-3 CH LIST Press to launch the channel list.
5-4 SRS Press to turn audio mode to SRS mode.
6 Number keys N/A
7 RECALL Press to return to the previous channel.
8 ENTER Press to confirm channel number selection.
9 MENU Press to open or close the Menu.
10 TTX/ MIX (TELETEXT/
MIX)
Press to switch from TV/AV to Teletext mode. Press to
overlay teletext page on the TV image.
11 Directional keys/OK
VOL (up/down)
CH (up/down)
N/A
12 WIDE Press to toggle scaling mode between 4/3, 16/9, Panorama
and Letterbox 1, 2, 3 modes.
13 MPX Press to select the sound input, displayed on the top right-
hand side (mono, stereo, bilingual).
14 VOL (+/-) Press to increase or decrease the volume.
15 CH (up/down) Press to sequentially select the TV channel.
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 SIZE Press once to zoom teletext page to 2X. Press again to
resume.
4 SUBTITLE Press to view subtitles on the screen.
5 SUBPAGE Press to access the teletext’s subpages directly.
6 HOLD Press to pause the current teletext page in multi-page
viewing mode.
7 REVEAL Press to reveal hidden teletext information.

Chapter 1 9
Basic Connection
Connecting the Power Cord
1. Connect the AC cord into the AC input on the back of the set.
2. Connect the male plug to the wall outlet as shown.
Connecting an Antenna/Cable
Connect the antenna cable to the appropriate antenna terminal on the back of the TV set as shown below.

10 Chapter 1
Getting Started Watching Your TV
Note: Setup may vary due to local broadcast differences.
#Item Description
1 Power a. Turn on the power switch beneath the screen.
b. Press the power button, number keys or channel up/
down button on the remote control.
2 Setup Wizard The first time you switch on the TV, the Setup Wizard will
guide you to complete the language selection and
channel scanning. Press OK key to begin the setup
process.
a. Select the setup language your prefer.
b. Please select country.
c. Enter the correct time zone using the remote control.
d. Enable or disable daylight saving time.
e. Ensure that your co-axial cables are connected
correctly before proceeding.
f. Scan for digital channels.
g. Scan for analog channels.
h. Setup is now complete. You are ready to begin
watching TV.
You can also adjust these settings using the front control
panel. Please see Front Panel View,
3 Changing channels a. Press 0-9 on the remote control to select a channel.
The channel changes after 2 seconds. Press ENTER to
select the select the channel immediately.
b. Pressing the channel (CH) up/down button on the
remote control will also change the channel.
4 Adjusting the volume Adjust the volume level using the (VOL) up/down button
on the remote control.

Chapter 1 11
Connecting External Audio/ Video Device
Connecting a DVD, VCR, STB or Audio/ Video Equipment
Connect your DVD player, VCR or audio/video equipment using the SCART port located at the rear of your LCD
TV as shown below.
Note: 1. Acer recommends the following priority for connection types: HDMI > COMPONENT > SCART >
Composite. 2. For AV3, Composite and component inputs share the same audio ports.

12 Chapter 1
Note: SCART-out only works with analog broadcasts.
Connecting a Camera, Camcorder or Video Game
Connect your camera or camcorder to the video/audio ports on the rear of the TV set as shown below.

Chapter 1 13
Connecting a PC or Notebook Computer
To display PC output on your TV, please connect your PC or notebook computer to the TV as shown below.
Note: For VGA input, Acer recommends setting your PC’s external monitor resolution to 1920 x 1080 pixels at
30Hz refresh rate.
Selecting the Input Source
Once you have connected your antenna or external equipment to the TV, you need to select the correct input
source. Press the corresponding button on the remote control to select the correct input source.
#Item Input Button Guide
1 TV key Toggle Analog TV (ATV) and Digital TV (DTV) between
input sources.
2 AV key Toggle AV3, AV4, HDMI1 and HDMI2 between input
sources.
3 SCART key Toggle SCART1 and SCART2 between input sources.

14 Chapter 1
4 PC key Toggle VGA between input sources.
#Item Input Button Guide