Acer AT3720A User manual

Acer AT3720A/3720B/3720 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 made on Acer LCD TV AT3720A/3720B/3720 service guide.
Date Chapter Updates

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

IV
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.

V
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.

VI

Chapter 1 1
Features
This LCD TV was designed with the user in mind. Here are just a few of its many features:
LCD Panel
TMax. resolution: 1366x768
TDisplay area: 37 inches diagonal
TDisplay color: 16.7 M colors (8 real bits per color)
TLife time: 60,000 hours
TInput Signal: 1-ch LVDS
TContrast ratio: 1200:1 ( Typ )
TBrightness: 500 cd/m2 ( Typ )
TResponse Time: AUO Typ. Gray to gray Tr=Tf=35ms
TViewing angle: 176 ( L ) / 176 ( R ), 176 ( U ) / 176 ( D)
I/O Functions
TRCA jack (YUV and CVBS) for YPbPr, YCbCr, video and audio
T15 pin D-Sub for VGA
T24 pin DVI / HDCP for DVI-D (optional)
T19 pin HDMI connector (optional)
TDIN45325 (IEC169-2) Terminal for TV / CATV input
T3.5 mm Earphone jack for audio line input
Video Functions
TSupport PAL/NTSC/SECAM video format (for AT3720A)
TSupport 480i/576i, 480p/576p, 1080i and 720p format
TBuild in Dynamic adaptive smoothing filter
TBuild in Dynamic temporal frame-filtering Noise Reduction
TBuild in Dynamic motion and edge adaptive De-interlacing
TFilm mode 3:2 and 2:2 pull down
TScreen display model 16:9 / 4:3 / panorama / zoon / PIP /POP
Mechanical
TDimensions (W x H x D mm): 944 x 692 x 261
TWeight (kg/lbs.): 23.9/53.1
TWall-mounting holes 400mm x 200mm
Power Source
TInput voltage: 100 ~ 240 V, 50 ~ 60 Hz
TMax. power consumption: 235W
°°°°
∮
System Specifications
Chapter 1

2Chapter 1
TInput current: 2.2A
TStandby consumption is under 5 Watts
Speaker
TInternal speaker: 10 W * 2 stereo, volume adjustable
TAmplimfier: 10W * 2 stereo, volume adjustable

Chapter 1 3
System Block Diagram
System Block and Wiring Diagram
LCD Main Board Block Diagram
M
AIN Board
SPEAKER IR Receiver Key Boar
d
Component2
Component1
A
V 2
A
V 1
I/O Board
A-Tuner
INVERTER
PANEL
M
odule
POWER

4Chapter 1
Board Layout
Cable Arrangement
No. Connector Cable Description
1 CN908 (Power Board) Inverter Cable
2 CN903 (Power Board) <-->CON15 (Main
Board)
Audio Cable-Main board (audio) to power
board
3 CN904<-->CON11 Power Cable
4 CON6 (Main Board) -CN1(Button Board)-CN1
(IR Board)
Button Board-IR Board (CN1)-Main Board
(CN1) Cable
5 CON17 (Main Board) LVDS Cable
6 CON13 (Main Board) Speaker Cable

Chapter 1 5
LCD TV Overview
A general introduction to Acer LCD TV ports, functions and indicators.
AT3720A/AT3720B/AT3720 Front panle view
The panel view below is for AT3720A/AT3720B/AT3720.
#Item Description
1 Power On/Off Power on or off the LCD TV.
2 Menu key Turn s the OSD menu On and OFF.
3 Channel up/down 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.
4 Volume +/- 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.
5 Input key When is OSD is on, press this button to confirm selection.
1
2
3
4
5

6Chapter 1
T3720A Rear panel view
#Item #Item
1 Power switch 6 PC Audio-in
2 AC-in 7 AV-Audio L/R + COMPONENT 1/2
3 HDMI 8 AV-Audio L/R + CVBS 1/2
4 VGA-in 9 Analog antenna
5DVI-d
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Chapter 1 7
AT3720B Rear panel view
#Item #Item
1 Power switch 6 Audio L/R + CVBS + COMPONENT
2 AC-in 7 Audio L/R + CVBS + COMPONENT 1/2
3 HDMI 8 Audio L/R + CVBS 1/2 + S-Video
4 VGA-in 9 Analog antenna
5 PC Audio-in
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8Chapter 1
AT3720 Rear panel view
#Item #Item
1 Power switch 5 PC Audio-in
2 AC-in 6 AV-Audio L/R + CVBS + COMPONENT
3 HDMI 7 SCART
4 VGA-in 8 Analog antenna
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Chapter 1 9
AT3720A Remote controller
General Keys
No. Item Description
1 POWER Press to turn your TV on/off.
2 DISPLAY Press to display input/channel information (dependent on input/source type).
3 MUTE Press to toggle audio on and off.
4 Input buttons (TV/AV/
COMPONENT/PC)
Press to select correct input mode.
5 SLEEP Press to set a time period after which the TV will switch itself to standby (15, 30,
45, 60, 90 or 120 minutes).
6 Number keys Press to select the TV channel.
7 RECALL Press to reture to the previous channel.
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11
2
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12 13
15 16
17
14
18 19 20 21

10 Chapter 1
8 ENTER Press to confirm channel number selection.
9 MENU Press to open or close the Menu.
10 CC Press to select close caption and text service between CC1, CC2, CC3, CC4,
Text1, Text2, Twxt3, Text4.
11 Directional keys/OK N/A
12 WIDE Press to toggle scaling mode between 4:3; 16:9, Panorama and Letterbox 1, 2,
3 modes.
13 MTS Press to switch the sound system between stereo, main and SAP. Information is
displayed in the top right-hand corner.
14 e (Empowering Technology) Press to activate Acer Empowering Technology.
15 VOL (+/-) Press to increase or decrease the volume.
16 CH (up/down) Press to sequentially select the TV channel.
17 PIP/PBP/POP Switch between PIP/PBP/POP modes.
18 SWAP For PIP/PBP mode: Toggle between the primary and subscreens.
19 ACTIVE Tobble between primary and subscreens.
20 POSITION When in PIP mode: Change subscreen position.
21 SIZE/MODE When in PIP mode: Change subscreen size. When in POP mode: Switch POP
mode from 1+5 to 1+12.

Chapter 1 11
AT3720B Remote controller
General Keys
No. Item Description
1 POWER Press to turn your TV on/off.
2 DISPLAY Press to display input/channel information (dependent on input/source type).
3 MUTE Press to toggle audio on and off.
4 Input buttons (TV/AV/
COMPONENT/PC)
Press to select correct input mode.
5 SLEEP Press to set a time period after which the TV will switch itself to standby (15, 30,
45, 60, 90 or 120 minutes).
6 Number keys Press to select the TV channel.
7 RECALL Press to return to the previous channel.
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1
7
11
2
10
6
3
9
8
4
5
12 13
15 16
17
14
18 19 20 21

12 Chapter 1
Teletext
8 ENTER Press to confirm channel number selection.
9 MENU Press to open or close the Menu.
10 TTX/MIX (TELETEXT/MIX) Press to return to the previous channel.
11 Directional keys/OK 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 in the top right-hand corner (mono,
stereo, bilingual).
14 e (Empowering Technology) Press to activate Acer Empowering Technology.
15 VOL (+/-) Press to increase or decrease the volume.
16 CH (up/down) Press to sequentially select the TV channel.
17 PIP/PBP/POP Switch between PIP/PBP/POP modes.
18 SWAP For PIP/PBP mode: Toggle between the primary and subscreens.
18 ACTIVE Toggle between primary and subscreens.
20 POSITION When in PIP mode: Change subscreen position.
21 SIZE/MODE When in PIP mode: Change subscreen size. When in POP mode: Switch POP
mode from 1+5 to 1+12.
No. Item Description
1 Colour 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.
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Chapter 1 13
AT3720 Remote controller
General Keys
No. Item Description
1 POWER Press to turn your TV on/off.
2 DISPLAY Press to display input/channel information (dependent on input/source type).
3 MUTE Press to toggle audio on and off.
4 Input buttons (TV/AV/
SCART/PC)
Press to select correct input mode.
5 SLEEP Press to set a time period after which the TV will switch itself to standby (15, 30,
45, 60, 90 or 120 minutes).
6 Number keys. Press to select the TV channel.
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 return to the previous channel.
11 Directional keys/OK N/A
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2
10
6
3
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4
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12 13
14 15

14 Chapter 1
Teletext
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 in the top right-hand corner (mono,
stereo, bilingual).
14 VOL (+/-) Press to increase or decrease the volume.
15 CH (up/down) Press to sequentially select the TV channel.
No. Item Description
1 Colour 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.
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