Acer AT3720A AT3720A Service Guide
Acer AT3720A Manual
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- Acer AT3720A | AT3720A Service Guide - Page 1
Acer AT3720A/3720B/3720 LCD TV Service Guide Service guide files and updates are available on the ACER/CSD web; for more information, please refer to http://csd.acer.com.tw PRINTED IN TAIWAN - Acer AT3720A | AT3720A Service Guide - Page 2
Revision History Please refer to the table below for the updates made on Acer LCD TV AT3720A/3720B/3720 service guide. Date Chapter Updates II - Acer AT3720A | AT3720A Service Guide - Page 3
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 - Acer AT3720A | AT3720A Service Guide - Page 4
Conventions The following conventions are used in this manual: SCREEN MESSAGES Denotes actual messages that appear on screen. . Gives precautionary measures to avoid possible hardware or software problems. Reminds you to do specific actions relevant to the accomplishment of procedures. IV - Acer AT3720A | AT3720A Service Guide - Page 5
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 - Acer AT3720A | AT3720A Service Guide - Page 6
VI - Acer AT3720A | AT3720A Service Guide - Page 7
pin DVI / HDCP for DVI-D (optional) T 19 pin HDMI connector (optional) T DIN45325 (IEC169-2) Terminal for TV / CATV input ∮ T 3.5 mm Earphone jack for audio line input Video Functions T Support PAL/NTSC/SECAM video format (for AT3720A) T Support 480i/576i, 480p/576p, 1080i and 720p format T Build - Acer AT3720A | AT3720A Service Guide - Page 8
T Input current: 2.2A T Standby consumption is under 5 Watts Speaker T T Internal speaker: 10 W * 2 stereo, volume adjustable Amplimfier: 10W * 2 stereo, volume adjustable 2 Chapter 1 - Acer AT3720A | AT3720A Service Guide - Page 9
System Block Diagram System Block and Wiring Diagram INVERTER PANEL POWER Module MAIN Board I/O Board A-Tuner AV 1 AV 2 Component1 Component2 SPEAKER IR Receiver Key Board LCD Main Board Block Diagram Chapter 1 3 - Acer AT3720A | AT3720A Service Guide - Page 10
Board Layout Cable Arrangement No. 1 2 3 4 5 6 Connector CN908 (Power Board) CN903 (Power Board) CON15 (Main Board) CN904CON11 CON6 (Main Board) -CN1(Button Board)-CN1 (IR Board) CON17 (Main Board) CON13 (Main Board) Cable Description Inverter Cable Audio Cable-Main board (audio) to - Acer AT3720A | AT3720A Service Guide - Page 11
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. 1 2 3 4 5 # Item Description 1 Power On/Off Power on or off the LCD TV. 2 Menu key Turn s the OSD menu On and - Acer AT3720A | AT3720A Service Guide - Page 12
T3720A Rear panel view 1 2 34 5 6 7 8 9 # Item 1 Power switch 2 AC-in 3 HDMI 4 VGA-in 5 DVI-d # 6 7 8 9 Item PC Audio-in AV-Audio L/R + COMPONENT 1/2 AV-Audio L/R + CVBS 1/2 Analog antenna 6 Chapter 1 - Acer AT3720A | AT3720A Service Guide - Page 13
AT3720B Rear panel view 1 2 3 45 6 7 8 9 # Item 1 Power switch 2 AC-in 3 HDMI 4 VGA-in 5 PC Audio-in # 6 7 8 9 Item Audio L/R + CVBS + COMPONENT Audio L/R + CVBS + COMPONENT 1/2 Audio L/R + CVBS 1/2 + S-Video Analog - Acer AT3720A | AT3720A Service Guide - Page 14
AT3720 Rear panel view 1 2 3 45 6 7 8 # Item 1 Power switch 2 AC-in 3 HDMI 4 VGA-in # 5 6 7 8 Item PC Audio-in AV-Audio L/R + CVBS + COMPONENT SCART Analog antenna 8 Chapter 1 - Acer AT3720A | AT3720A Service Guide - Page 15
AT3720A Remote controller General Keys 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 No. 1 2 3 4 5 Item POWER DISPLAY MUTE Input buttons (TV/AV/ COMPONENT/PC) SLEEP 6 Number keys 7 RECALL Chapter 1 Description Press to turn your TV on/off. Press - Acer AT3720A | AT3720A Service Guide - Page 16
. 10 CC Press to select close caption and text service between CC1, CC2, CC3, CC4, Text1, Text2, 14 e (Empowering Technology) Press to activate Acer Empowering Technology. 15 VOL (+/-) Press to increase (up/down) Press to sequentially select the TV channel. 17 PIP/PBP/POP Switch between - Acer AT3720A | AT3720A Service Guide - Page 17
AT3720B Remote controller General Keys 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 No. 1 2 3 4 5 Item POWER DISPLAY MUTE Input buttons (TV/AV/ COMPONENT/PC) SLEEP 6 Number keys 7 RECALL Chapter 1 Description Press to turn your TV on/off. Press - Acer AT3720A | AT3720A Service Guide - Page 18
(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 - Acer AT3720A | AT3720A Service Guide - Page 19
AT3720 Remote controller General Keys 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 No. 1 2 3 4 5 6 7 8 9 10 11 Item POWER DISPLAY MUTE Input buttons (TV/AV/ SCART/PC) SLEEP Number keys. RECALL ENTER MENU TTX/MIX (TELETEXT/MIX) Directional keys/OK Description Press to - Acer AT3720A | AT3720A Service Guide - Page 20
right-hand corner (mono, stereo, bilingual). Press to increase or decrease the volume. Press to sequentially select the TV channel. 1 2 7 34 56 No. 1 2 3 4 5 6 7 Item Colour buttons (R/G/Y/B) INDEX SIZE SUBTITLE SUBPAGE HOLD REVEAL Description Operates corresponding button on - Acer AT3720A | AT3720A Service Guide - Page 21
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. For AT3720A: For AT3720B: For AT3720: Chapter 1 15 - Acer AT3720A | AT3720A Service Guide - Page 22
an antenna/cable Connect the antenna cable to the appropriate antenna terminal on the back of the TV set as shown below. Getting started watching your TV 1 2 1 4 3 1 1. Select the setup language you prefer. 2. Please select country. 3. Ensure that your co-axial cables connected - Acer AT3720A | AT3720A Service Guide - Page 23
switch beneath the screen. b. Press the power button, number keys or channel up / down button on the remote control. 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 - Acer AT3720A | AT3720A Service Guide - Page 24
your LCD TV as shown below. For AT3720A: Source-IN Y Yellow R Red W White Blue Green S S-video NOTE: Acer recommends - Acer AT3720A | AT3720A Service Guide - Page 25
For AT3720B: Y Yellow R Red W White Blue Green 6 6YLGHR Chapter 1 - Acer AT3720A | AT3720A Service Guide - Page 26
For AT3720: Source-IN Y Yellow R Red W White Blue Green * Acer recommends the following priority for connection types: HDMI -> COMPONENT -> SCART -> Composite. TV-OUT *SCART-out only works with analog - Acer AT3720A | AT3720A Service Guide - Page 27
Connecting a PC or notebook computer To display PC output on your TV, connect your PC or notebook computer to the TV as shown below. For AT3720A: NOTE: For VGA and DVI input, Acer recommends setting your PC's external monitor resolution to 1360 x 768 pixel @ 60 - Acer AT3720A | AT3720A Service Guide - Page 28
For AT3720: 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. 22 Chapter 1 - Acer AT3720A | AT3720A Service Guide - Page 29
For AT3720A/AT3720B: TV AV COMPONENT PC 1 2 3 4 No 1 2 3 Item TV key AV key COMPONENT key 4 PC key For AT3720: Input Button Guide Toggle Analog TV (ATV) between input sources. Toggle AV1, AV2, AV3-CVBS* and HDMI between input sources. Toggle COMPONENT 1, COMPONENT2 and AV3-COMPONENT* - Acer AT3720A | AT3720A Service Guide - Page 30
management, Options, Settings and Empowering. Use the following method to navigate these menus. 1 Press the MENU button on the remote control or the MENU button on the control panel. 2 Select your desired menu by using the up and down directional keys to switch betwee the six menus. 3 24 - Acer AT3720A | AT3720A Service Guide - Page 31
The OSD can be used for adjusting the settings of your LCD TV. Press the MENU key to open the OSD. You can use the menus. 4 The Channel management menu can be used to set channel skipped, select TV system and scan channels automatically. Adjusting other options 1 Press the MENU key to bring up - Acer AT3720A | AT3720A Service Guide - Page 32
NOTE: The options available on the OSD may vary depending on the TV signal source. 26 Chapter 1 - Acer AT3720A | AT3720A Service Guide - Page 33
Less than 2 seconds Default setting in different mode Set-up Empowering mode More than 2 seconds The Empowering Key opens up the Acer Empowering Technology functions. In TV mode, the choice is between Scenario mode and Favorite channel. Set-up Empowering mode To change your Empowering Key's default - Acer AT3720A | AT3720A Service Guide - Page 34
number key to change channel. There are a total of five slots in which you can store TV programs. On the remote control, if you press the Empowering Key for less than two second, the TV will toggle between the five stored TV channels sequentially according to your list of favorites. 28 Chapter 1 - Acer AT3720A | AT3720A Service Guide - Page 35
, you will be asked to choose your language settings. NOTE: You can also interact with these menus using the front panel controls. Navigating the OSD with Remote Control There are five main OSD menus. These are: Picture , Audio , Settings , Options and Empowering . Use the following method to easily - Acer AT3720A | AT3720A Service Guide - Page 36
information via the teletext feature. This Acer LCD TV has 252 pages of memory which will store pages and subpages, thereby reducing waiting time. The teletext buttons on the remote control are listed below. Item INDEX SUBTITLE TELETEXT REVEAL SIZE MIX HOLD Color buttons (R/G/Y/B) Description - Acer AT3720A | AT3720A Service Guide - Page 37
PBP modes. PBP PBP (Picture-by-Picture) POP POP POP POP POP POP (Picture-on-Picture) TV AV COMPONENT PC PIP PIP Swap PIP PIP PIP PIP PIP PIP 1a. Press the ACTIVE key to the SIZE/MODE key to select the size of the subscreen, from 25% -> 37.5% -> 50%, as shown in the image. Chapter 1 31 - Acer AT3720A | AT3720A Service Guide - Page 38
at 60Hz. For resolutions higher than this, "Out of Range" will be displayed. NOTE: The POP can only support 1+12 when the main screen scurce is HD content or in VGA mode. Lock TV Locking TV content Lock TV allows you to enter a password and effectively stop anyone without the password from watching - Acer AT3720A | AT3720A Service Guide - Page 39
menu. Then select Set PIN. (see note) 3 Enter a four-digit password. Type it again and press OK to reconfirm. 4 Press MENU to exit. Locking your TV 1 Press the MENU key on the remote control to bring up the OSD. 2 Use the directional keys to navigate to the Settings menu. Then select Lock - Acer AT3720A | AT3720A Service Guide - Page 40
+ LCD) life 19. Panel interface 37 inches for AT370A/AT3720B/AT3720 AUO TFT with Super MVA technology or SIPS or QSV 1366 x 768 16.7 M colors (8 real bits per color) Red Green Blue White 0.638 0.271 0.145 0.275 0.335 0.597 0.065 0.298 Five models - Acer AT3720A | AT3720A Service Guide - Page 41
converter and is not use replaceable, and must be returned for replacement. This fuse is well selected which is used to light up backlight of LCD panel is well designed to meet requirement of Input 3. Built-in Speaker 4. acoustical noise (complete TV) Level: 500 mVrms Type: Stereo R/L Channels - Acer AT3720A | AT3720A Service Guide - Page 42
Languages supported Czech, remote control "power", "0 ~ 9", "CH +/-"). 4. Stand-by reason The TV pass in standby mode upon: • The button "power" is pressed (keypad or remote control 140 40 7. Analog TV naming function 8. PIP / POP / PBP function Manual: Automatic: Manual: PIP PIP multiple size - Acer AT3720A | AT3720A Service Guide - Page 43
mode, VGA, DVI and HDMI supported2 • Component1 can support up to 576P in POP5 mode1. DVI VGA Component 2 Component 1 HDMI AV2 AV1 TV Main Sub TV X X AV1 X X AV2 X X HDMI X X Component 1 X B) • PAL, SECAM (automatic detection) • PAL (4.43 M, 50Hz) B G D K • SECAM L Chapter 1 37 - Acer AT3720A | AT3720A Service Guide - Page 44
functions 17. Audio management 18. Audio enhancement 19. AV sub-format supported 20. Copy protection management 21. IR performance 10 bits (chroma and Stereo, SRS, WOW, BBE CVBS, YC, RGB, YUV HDCP (HDMI) The reception distance indicates the distance between IR emitter and receptor which allow - Acer AT3720A | AT3720A Service Guide - Page 45
S-video, Audio R/L CVBS, S-video, Audio R/L YCbCr/YPbPr, Audio R/L YCbCr/YPbPr, Audio R/L Yes (HDCP) 19 pins HDMI signal link (HDCP) Yes Yes Environmental Requirements The TV shall meet the following environmental requirements under normal operating conditions. 1. Operating 2. Storage and Shipping - Acer AT3720A | AT3720A Service Guide - Page 46
B. The unit under test shall be run for a duration of 30 minute in each of following orientations. a. Top and bottom side (z axis) b. Left and right side (x axis) c. Front and rear side (y axis) The unit shall suffer no visible cosmetic damage and should operate no degradation indisplay quality - Acer AT3720A | AT3720A Service Guide - Page 47
Chapter 2 Machine Disassembly and Replacement This chapter contains step-by-step procedures on how to disassemble the notebook computer for maintenance and troubleshooting. To disassemble the computer, you need the following tools: T Wrist grounding strap and conductive mat for preventing - Acer AT3720A | AT3720A Service Guide - Page 48
General Information Before You Begin Before proceeding with the disassembly procedure, make sure that you do the following: 1. Turn off the power to the system and all peripherals. 2. Unplug the AC adapter and all power and signal cables from the system. 3. Remove the battery pack. 42 Chapter 3 - Acer AT3720A | AT3720A Service Guide - Page 49
Procedure Flowchart The flowchart on the succeeding page gives you a graphic representation on the entire disassembly sequence and instructs you on the components that need to be removed during servicing. For example, if you want to remove the system board, you must first remove the keyboard, then - Acer AT3720A | AT3720A Service Guide - Page 50
Steps 1. Remove the six screws fastening the stand to the LCD TV, then remove the stand. 2. Then detach the stand assembly from the LCD TV. 3. Remove the 15 screws holding the back cover. 4. Detach the back cover from the LCD TV. 5. Remove seven screws holding the EMI shielding on one side - Acer AT3720A | AT3720A Service Guide - Page 51
three screws holding the main board-keypad-I R board cable and remove the cable. 20. If you need to take out the entire LCD module from the front bezel, please remove the four screws holding the LCD module to the front bezel. 21. Remove two screws on the left as shown. Chapter 3 45 - Acer AT3720A | AT3720A Service Guide - Page 52
right as shown. 23. Remove another four screws fasteing the LCD moudle to the front bezel. 24. Then you can hold the LCD brackets and lift the entire LCD module then take it away. 25. If you need to detach the LCD brackets from the LCD module, please remove two screws as shown. 26. Remove - Acer AT3720A | AT3720A Service Guide - Page 53
30. Remove four screws holding the LCD brackets to the LCD. 31. Then detach the LCD brackets from the LCD. 32. Remove the three screws holding the inverter bracket. 33. Detach the inverter bracket carefully. 34. Disconnect the inverter cable and backlight cables from the - Acer AT3720A | AT3720A Service Guide - Page 54
48 Chapter 3 - Acer AT3720A | AT3720A Service Guide - Page 55
Chapter 3 Troubleshooting Use the following procedure as a guide for Acer LCD TV AT3720A/AT3720B and AT3720 problems. NOTE: The diagnostic tests are intended to test this model. Non-Acer products, prototype cards, or modified options can give false errors and invalid system responses. 1. Duplicate - Acer AT3720A | AT3720A Service Guide - Page 56
AT3720A Troubleshooting Guideline 1. Can not power on A Power code Plug in? LED Bright? no Check Power code no Replace Power board or Main board Or IO board or All cable / LED Bright Green color ? no LCD Panel no can Display ? END Check Remote control OK and keypad ? NG Replacement - Acer AT3720A | AT3720A Service Guide - Page 57
2. LCD no backligh B Inverter power Cable had Plug in no Change Inverter Power Cable LCD Panel Backlight no Bright ? Replacement Power/B LCD Panel Backlight Bright ? no Replacement LCD Panel Inverter /B LCD Panel Backlight Bight no Replacement Main/B END Chapter 4 51 - Acer AT3720A | AT3720A Service Guide - Page 58
3. Remote controller does not have function C Remote Control have battery? no Change Battery IR Board Cable plug in no Check IR/B cable or Replacement IR/B Cable Press Remote Menu Key OSD can Display? no Replacement IR/B Press Remote Menu Key OSD can Display? no Replacement M/B END 52 - Acer AT3720A | AT3720A Service Guide - Page 59
4. Button key does not have function D Key Board Cable plug in no Check K/B cable or Replacement K/B Cable Press Menu Key check have Function? no Replacement K/B Cable no Press Menu Key check have Function? Replacement K/B Cable End End Chapter 4 53 - Acer AT3720A | AT3720A Service Guide - Page 60
5. RF no display E RF Cable plug in no Check RF cable or Replacement RF Cable Replacement I/O board RF Can Display END no Replacement M/B 54 Chapter 4 - Acer AT3720A | AT3720A Service Guide - Page 61
6. Component 1, 2 no display F Component Cable plug in? no Check Component cable or Replacement Component Cable Replacement I/O Board Component can display no Replacement M/B Board END Chapter 4 55 - Acer AT3720A | AT3720A Service Guide - Page 62
7. AV1, AV2 no display G CVBS Cable plug in? no Check CVBS cable or Replacement CVBS Cable Replacement I/O Board CVBS cCaatn display END no Replacement M/B Board 56 Chapter 4 - Acer AT3720A | AT3720A Service Guide - Page 63
R/L source cable Video can Display ? no Check Video cable or Replacement Video Cable Mute turn off Volume set 50 Speaker R/L cable plug IN? no Check Speaker cable or Replacement Speaker cable Speaker have Sound Output END no Replacement IO/B or Speaker Speaker have Sound Output ? no - Acer AT3720A | AT3720A Service Guide - Page 64
9. VGA no display J DVI Cable plug in? Read EDID DATA EDID Data Norma?l no Check DVI cable or Replacement DVI Cable no Write EDID data DVI can display? no Replacement M/B END 58 Chapter 4 - Acer AT3720A | AT3720A Service Guide - Page 65
10. DVI no display J DVI Cable plug in? Read EDID DATA EDID Data Norma?l no Check DVI cable or Replacement DVI Cable no Write EDID data DVI can display? no Replacement M/B END Chapter 4 59 - Acer AT3720A | AT3720A Service Guide - Page 66
11. HDMI no display K no HDMI Cable plug in? Read EDID DATA EDID Data Norma?l no Check HDMI cable or Replacement HDMI Cable Write EDID data no HDMI can display? Replacement M/B END 60 Chapter 4 - Acer AT3720A | AT3720A Service Guide - Page 67
12. HDMI no sound L HDMI Cable plug in ? Read EDID DATA EDID Data normal ? Sound output? no Check HDMI cable or Replacement HDMI CABLE no Write EDID data no Replacement Main/B END Chapter 4 61 - Acer AT3720A | AT3720A Service Guide - Page 68
13. VGA/DVI no sound M PC/DVI can Display ? Turn off Mute function Volume set to 50 Audio Line in Cable Plug IN? Sound Normal ? no Check Video cable or PC or Replacement VGA/DVI cable no Check Line in cable or Replacement Line in Cable no Replacement Main/B END 62 Chapter 4 - Acer AT3720A | AT3720A Service Guide - Page 69
plug in? Mute turn-off Volume =30 no Check Component cable or Replacement Component Cable Component Source can Display? no Check Component cable or Replacement Component Cable Component Sound no Normal? Replacement IO/B Component Sound Normal? no Replace L1 M/B END Chapter 4 63 - Acer AT3720A | AT3720A Service Guide - Page 70
turn-off Volume =30 no Check Video and R-L cable or Replacement Video or R-L Cable AV1/S-Video Source can Display? no Check Video and R-L cable or Replacement Video or R-L Cable AV1/S-Video Sound Normal? no Replacement IO/B AV1/S-Video Sound Normal? no Replace L1 M/B END 64 Chapter 4 - Acer AT3720A | AT3720A Service Guide - Page 71
you the FRU (Field Replaceable Unit) listing in global configurations of AT3720A/AT3720B/ AT3720. Refer to this chapter whenever Service Guide. For ACER AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT part number code from those given in the FRU list of this printed Service Guide - Acer AT3720A | AT3720A Service Guide - Page 72
AT3720A Exploded Diagram AT3720A/AT3720B/AT3720 FRU List is not ready as the service guide released. We will add the FRU list as soon as possible. 66 Chapter 4 - Acer AT3720A | AT3720A Service Guide - Page 73
Chapter 4 67