AOC LE32A3520/61 User manual

32″LCDTV AOC LE32A3520/61
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Service
Service
Service
Horizontal Frequency
15.326~67.5KHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
6.1 Main Board…………..……………...…….…….......33
6.2 Power Board……...…………..….…….……….......34
6.3 Key Board……………………………………….......35
6.4 IR Board……………………………………….......35
7. Adjustment..............................................................36
8. Block Diagram.…….................................................37
9. Schematic Diagram…..…………....………………...39
9.1 Main Board…………………………………...….......39
9.2 Power Board…………..….….……...………….......51
9.3 Key Board……………………………………….......56
9.4 IR Board……………………………………….......57
10. Exploded View………………………………….…...58
11. BOM List……………….………………….………….60
Table of Contents.......……....................................…........1
Important Safety Notice.......................................……......2
Revision List…………………………………………………3
1. General Specification..............................……...…........4
2. Operating Instructions………………...…….……….......5
2.1 The Use of Remote Control…….…..……….…….......5
2.2 To Use the Menus….....………………….…..…….......6
2.3 How to Connect……..……………….…….……….....17
2.4 Front Panel Control Knobs…….………….……….....19
3. Input/Output Specification…………....................…....20
4. Mechanical Instructions…………………….................22
5. Repair Flow Chart ……………………….…….…….....26
6. PCB Layout ………………..………………....….......33

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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The
special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics might create
shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC.
AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiations when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)

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Revision List
Version Release Date Revision Instructions Customer Model TPV Model
A00 May.28,2012 Initial release LE32A3520/61 E32C1KNCASA1NNX

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1. General Specification
Note:
• Designs and specifications are subject to change without notice.
• This model may not be compatible with features and/or specifications that may be added in the future.

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2. Operating Instructions
2.1 The Use of Remote Control
Multichannel Television Sound (MTS)
The broadcasting standard, which allows stereo sounds to be transmitted with the TV picture.

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2.2 To USE the Menus
Power On And off
Press the power button at your TV set or remote controller to power it on.
Reminder
1. Your TV set continues consuming powers at a very low consumption rate. When you will not use it for extended
period of time, disconnect the power cable between the TV set and power socket.
2. When the remote control is not available and if you want to turn on your TV set from the standby mode, please
press the Power key, CH+/- key or the source key at its side.
3. When turning your TV set off with the power switch of your TV set, it enters the power saving mode and displays
red light.
Switching Input Source
You can select signal sources to your AOC TV set directly with your remote controller. You can also press the
Source key to display source menu and then select signal source.
1) Directly select the input signal sources by using
2) Select signal source with the Source key
Press the Source button to display source menu.
Press the button to select desired input source.
Input source contains:TV,AV1,AV2,YPbPr,VGA ,HDMI1,HDMI2,HDMI3,USB.
Press the OK.

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How to select on screen Menu items
Press the MENU button to display main menu
Press the button to select required menu icon for picture
setup, icon for sound setup, icon for feature setup, icon for
Channel setup and icon for USB media setup.
Press the and button to select the desired menu item and then press
the OK for entering into the sub menus.
Follow sub-menu operations and the detailed description refer to the table under each
settings description.
Press the MENU button return to previous menu.
Picture Setting

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Main menu Sub Menu Functions Description
Standard For standard picture settings. Recommended for home
entertainment.
Cinema For viewing film-based content. Most suitable for viewing in a
theater like environment.
Vivid For Enhances picture contrast and sharpness.
Mild Optimizes video for viewing more mild.
Sport Optimizes video for watching sports event.
Game Optimizes video for playing game and entertainment content.
Personal
Brightness Brightens or darkens the picture.
Contrast Increases or decreases picture contrast.
Color To add or reduce color.
Tint Video tint adjustment, Can only select with NTSC signal.
Sharpness To improve details. Not available in PC mode.
Backlight
Control the brightness of the backlight from 0 to 100. Lower
the backlight value brightness is low and Higher the backlight
value higher the brightness.
Color Temp Select the color temperature.
Sound Setting
Main menu Sub Menu Functions Description
Standard For standard quality sound with treble and bass at medium level
Voice Suitable for spoken dialog.
Music Enhance treble and bass and optimizes sound for listening to music.
Theatre Optimizes sound for watching movie content.
Personal
Balance Adjust the balance between left and right speakers to adapt to your
listening position.
300Hz Adjusts the level of specific bandwidth frequencies to get customized
sound quality.
Increase 300Hz bandwidth frequency bar increases Bass in sound
Increase in 15KHz bandwidth frequency increases Treble in sound.
Change middle frequency bandwidth (3KHz) to vary Voice content in
sound
1KHz
3KHz
8KHz
15KHz

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Settings Menu
Main menu Sub Menu Functions Description
Channel Search Auto Search, Update Search,
Manual Search Please refer to“Channel Search” (p19,p20)for details.
Other Adjustments
Password Setting. TV Lock,
Blue Screen, Sleep Time,
Zoom, Noise Reduction, DCR,
DCC, HDMI/DVI Switch
Please refer to “Other Adjustments” (p21) for details.
Sound and OSD
Language, Menu
Transparency, Menu Timeout,
DSS Effect, AVL, Sound Mode.
Please refer to “Sound and OSD” (P22) for details.
PC Auto Adjust, H. Position, V.
Position, Phase and Clock Please refer to “PC setup” (p23) for details.
System Reset
You can restore the factory default picture and sound
settings of your TV.
The channel settings and TV lock remains the same.
Channel Search
This setting is only available in TV mode.

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Main menu Description
Auto Search
TV automatically searches for the channel in the available frequency band and stores
sequentially.
1. Select Channel Search menu.
2. Select Auto Search and press OK key or ►arrow key to tune channels automatically and
store.
3. During auto searching Press Menu key to stop search.
Update Search
Updates your channel list by adding new/missed channels to the end of the list without
disturbing previously stored channels. Updated Search can be done when Auto Search is
interrupted before searching all channels. It takes same time as auto search.
Manual Search
Search for the channels manually and store it to the desired channel number. It can also be
used for editing of channels searched by auto search if required. Please refer to "Manual
Search description" in next page for details.
Manual search description
1. Select Channel Search menu.
2. Select Manual Search and press OK key or ►arrow key to get Manual search sub-menu.
Menu Function Description
Channel NO. Press the ◄/►arrow button to select desired channel number.
Channel Name
To Enter a name for the selected channel.
Press ►arrow button and then press ▲/▼arrow button to select a character.
Press ►arrow to move the cursor to next position.
Program Name can be a word of maximum 10 characters.
To confirm the name press Menu button.
Fine Tune
Press numeric buttons on remote to manually enter the frequency if the desired channel
frequency is known.
If the desired channel frequency is unknown then simply press hold ►button for 3second to
enter into Manual search mode. If the desired channel is found press Menu button to store the
channel found to the specified channel number else press ►button till desired channel is
found.
Color System
Press the ◄/►button to select the required Color system.
Available color systems are [Auto], [PAL], [NTSC] and [SECAM].
India region: Auto or PAL must be selected as the color system.
Tips: Skip this step if your system setting is correct.
Sound System
Press the ◄/►button to select the required Sound system
Available sound systems are [Auto], [M], [BG], [I] and [DK].
India region: Auto or BG must be selected as the sound system.
Tips: Skip this step if your system setting is correct.
AFC Automatic Frequency Control: Reduces the tuning error of a TV tuner by automatically fine
tuning the TV tuner to desired channel. By default AFC is On.

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Channel Edit Menu
1. In these case the shortcut key like Red key, Green key, Yellow key, Blue key action as below.
2. Red key: To set the channel as user’s favorite channel.
3. Green key: To skip the channel and you will not find this channel by press Ch+/- key to change channel.
4. Yellow key: To lock the channel and user will get the channel only by entering the password.
5. Blue key: To delete the channel and user will get the channel only by re-searching the channel.
Other Adjustments

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Menu Functions Description
Password Setting
The initial password for AOC is 0000. You can change the password to any 4-digit number
of your choice.
A super password 3448 is pre-defined to enter into child lock setup function in case you
have forgotten the password.
The super password cannot be used as a normal password. It is used for setting up user
password only.
Note: All the passwords are cleared after a valid password is entered once in power on
mode.
TV Lock
You can restrict to access of the Channel Search menu, so that initial tuned channels are
not disturbed by the unauthorized users. Access to locked channels in channel edit menu
will be denied only when TV lock is On.
How to enable the TV lock?
1. Select the TV lock ON.
2. Turn off the TV.
3. Turn ON the TV, now TV lock is enabled.
Blue Screen
To select the transition type required while changing from one channel to another
Select Off: Blank signal will appear while changing the channel.
Select On: Blue screen will appear while changing the channel.
Select Freeze: Picture get freeze while changing the channel
Sleep Time
Set a time period after which the TV will be turned off and enter standby mode
automatically. Sleep timer can be set to off, 15, 30, 60, 90 & 120 minutes.
Tips: 1. The TV switches to standby after the specified time.
2. This can also be set by using the Sleep button on the remote control.
Zoom
To resize the aspect ratio of the picture for optimum viewing
Available aspect ratio are : Wide, Normal, Zoom 1,Zoom 2;
For PC mode: Normal and Wide mode.
Picture size can also be accessed by Zoom button on remote control.
Noise Reduction
To filter out and reduces the image noise and improve picture quality. It is available only in
TV, AV and YPbPr mode Available options for Noise reduction are: off, Low, Medium,
High.
DCR Dynamic contrast ratio: Setup the contrast of the TV set to vary in accordance with the
brightness and darkness of the TV set when it is set to on.
DDC To strengthen the contrast of TV picture.
(Not support in PC source mode).
HDMI/DVI Switch Setting HDMI/DVI switch, available only in HDMI source
Color System Select the required color system.
Available only in AV source.
* Passwords Setting, TV Lock, Blue Screen functions are available only in TV mode.
* Noise Reduction, DCR, DCC will be enable only when the Picture mode is Personal.
* Press Red key on remote control to reset Blue screen, Sleep time, Zoom, Noise Reduction, DCR, DCC, HDMI/DVI
Switch, Color System functions to the default settings.
Sound and OSD

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Menu Function Description
Language Select required Language. English will be the default
OSD language.
Menu Transparency To set Menu Transparency (0%~100%).
Menu Timeout Set time duration for OSD display.
DSS Effect It can create the perception that there are many more
sources of sound than are actually present,
AVL Automatically reduces sudden volume changes, for
example , when switching between the channels,
Sound Mode
Select sound mode: Mono or Stereo. It is default FM
mono for India region.
It can also be accessed by pressing MTS on the remote
control to directly toggle the modes. Only support in TV
source mode.
PC setting
Menu Functions Description
Auto Adjust Press ►arrow button to adjust the screen automatically
to the optimal position of the picture.
H. Position Adjusts the horizontal position of the picture.
V. Position Adjusts the vertical interfering lines.
Phase Eliminate the vertical interfering lines.
Clock Eliminate the vertical interfering lines by adjusting clock
frequency.

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Note:
* If the PC is connected to the TV and no signal has been input from the PC for more than 30 seconds, the TV enters
the standby mode automatically.
* This setting is only available in VGA source
Media Functions (USB)
TV USB port can be used to view JPEG photos, play mp3 music and Video files, and read text present in USB
devices.
Entering to USB Media:
Press the Direct USB key on remote to get USB Media menu as shown above Or Press the Source key and
▲/▼/◄/►keys on remote and select USB source to get USB Media menu as shown above Select the Media type
(Photo/ Music/ Video/ Text) to be viewed and press OK key to enter into USB Media and When USB drive is
detected by the TV, USB drive is displayed as a folder on the screen as shown below. If more than one USB is
plugged to the TV two folders will be displayed. Select the required drive and press OK key to view subfolder or files
in the USB drive.
Note: * If USB storage device is plug-in to TV USB port, Media menu will pop up on TV screen irrespective of Input
Source.
* Files of selected Media type can only be viewed through USB. Media type can be any one among Photo /
Music / Video / Text.
Viewing Photos
1. Thumbnail of the available images will be displayed on the screen. If no images are displayed then select the
folder containing the Photos.
2. To select a particular image and to display it in full screen press key and press OK key. Slide show starts
automatically when image is viewed in full screen.
3. Press key to play/pause slideshow. Press to view previous or next image. Press key to
stop slideshow

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USB menu settings for Photo Slide show
Press OK key to get following Menu setup shown above.
1. [Transition Effect]: Select the slide transition as None, Top To Bottom, Bottom To Top, Left To Right, Right To Left,
Random.
2. [Rotate]: Rotate the select photo by 90° clock wise direction.
3. [Play Time]: Select the duration of time a photo is to be displayed.
4. [Information]: Display the information of the file.
Playing Music files
1. Thumbnail of the available music files will be displayed on the screen. If no files are displayed then select the
folder containing the music files.
2. To play particular music file select the required file and press OK key.
3. Press key to play/pause music. Press to play previous or next track. Press key to stop
Music play.
USB menu settings for Music play
Press OK key to get following Menu setup shown above.
1. [Repeat Mode]: Select the repeat mode as None, Single, Random, All.
2. [Sound Mode]: Select sound mode like Pop, Rock, Classical, Dance, Music, Personal.
3. [DSS Effect]: Turn on or off TV DSS effect.
4. [Background Music]: Select it to on to turn off display and to get only sound from TV
5. [Information]: Display the information of the file.
Playing Video files
1. Thumbnail of the available video files will be displayed on the screen. If no files are displayed then select the
folder containing the video files.
2. To play particular video file select the required file and press OK key.
3. Press key to play/pause video. Press to play previous or next video. Press key to
stop video play.
USB menu settings for Video play
Press OK key to get following Menu setup shown above.
1. [Repeat mode]: Select the repeat mode as None, Single, All, Random.
2. [Information]: Display the information of the file.

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Reading Text files
1. Thumbnail of the available text files will be displayed on the screen. If no files are displayed then select the folder
containing the text files.
2. To read particular text file select the required file and press OK key.
3. Press ◄/►/▲/▼keys to browse the text. Press MENU key to stop text read.
USB menu settings for text read
Press OK key to get following Menu setup shown above.
1. [Next Page]: Select the duration of time a page is to be displayed.
2. [Display Mode]: Select the text display mode as 4:3 and 16:9.
3. [Font Size]: Select the text font size.
Formats supported to multimedia mode: Photo, Music, and Video.
Picture Format Resolution Type Note
JPEG 16128×16128 Baseline JPEG
Audio Format Sample Rate Date Rate Channel
MP3 8-48KHz 8-320Kbps Mono/Stereo
Video
Format File Extension Codec Date Rate
Real media .RM/.RMVB RealVideo8/9 Max 1200Kbps
MPEG1/2 .DAT/.MPG MPEG-1/2 Video Max 3000Kbps
MPEG4 .AVI/.MP4 DIV×3/4/5/6XviD/H.264 Max 1500kbps
Remarks:
1. USB interface of digital multimedia player is not all-purpose. So when some USB devices could not be recognized,
the problem is usually not the performance failure but due to device driver.
2. Because USB devices and memory capability are different, the time needs for multimedia player to read
information are also different. So the information reading speed of the player temporarily getting slow are not the
performance failure.
3. The voltage supplied to USB interface is 5V, and the most electrical current is 500mA. When some interface
criteria of USB devices are different from standard USB protocol, digital multimedia player may be unable to
recognize USB devices correctly, which is normal status.
4. USB could be used as an interface to update software.
5. If some files source could not play because of the parameter decoding-limitation, the problem is not performance
failure.
6. The system only applies to memory medium with FAT32 and NTFS format.7. The system cannot support dynamic
Gif format.

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2.3 How to Connect
Connecting TV
Cable System or VHF/UHF Antenna System
You can enjoy standard-definition and high-definition digital programming (if available in your area), along with
standard-definition analog programming.
It is strongly recommended that you connect the antenna/cable input using a 75-ohm coaxial cable to receive
optimum picture quality. A 300-ohm twin lead cable can be easily affected by radio frequency interference, resulting
in signal degradation.
Cable or VHF/UHF (or VHF only)
High Definition Interface
You can enjoy high-definition programming by subscribing to a high-definition cable service or a high-definition
satellite service. For the best possible picture, make sure you connect this equipment to your TV via the HDMI
or component video (with audio) input on the back of your TV.
HDMI Connection
If the equipment has a DVI jack and not an HDMI jack, connect the DVI jack to the HDMI IN (with DVI-to-HDMI cable
or adapter) jack and connect the audio jack to the PC AUDIO IN jacks.
Component Signal Connection

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Composite Signal Connection
PC Connection
Use the TV as a monitor for your PC shown below with the HD15 to HD15 connection. This TV can also be
connected to a PC with DVI or HDMI output.
• Connect the PC IN jack to the PC using the HD15- HD15 cable with ferrite core (analog RGB) and audio cable.
• If the PC is connected to the TV and no signal has been input from the PC for more than 30 seconds, the TV enters
the standby mode automatically.
Connecting USB drive
Connecting Earphone

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2.4 Front Panel Control Knobs
Controls & Connections
Controls
Item Description
1. VOL+/- Press to increase or decrease the sound volume level.
2. CH Press to select the next higher or lower program number.
3. MENU Press to open or exit the OSD menu.
4. INPUT Press to select the input source.
5. (Power) Switches the product on/standby or off. The product is not powered
off completely unless it is physically unplugged.
Connections
Item Description
AV(Audio/Video)Input Connect audio (L/R)/video output from an external device to these jacks
Video Output For connecting the Composite Video signal of the TV to other display
devices as their source signal.
HDMI Input
Connect a HDMI signal to HDMI port. The HDMI (High definition Multimedia
Input) connector provides Non-compressed and fully digital audio/video data
transmission between TV set and any HDMI audio/video devices, including
the set top box, DVD player, Blue-ray player, A/V receiver and computer.
You need an HDMI connection for viewing in 480i, 480p, 576i, 576p 720p,
1080i and 1080p modes.
PC VGA IN (RGB)&PC Audio IN
It is used to Connect the video output port of a personal computer with a 15
pin D-sub (Analog RGB) VGA cable. It can be connected to other simulated
RGB devices. Connect separate audio cable between PC and TV to get
sound. Please refer to “Reference Table for computer input signal” for
signals that can be displayed.
Component input
Connect a component video (YPbPr) / audio (L/R) device to these jacks.
Component provides better picture quality than the composite video
connections.
TV Antenna input The RF input is for connecting to the cable or VHF/UHF antenna.
USB Connect USB storage device to enjoy Photos, Music and Videos.
SPDIF (Coaxial Digital Audio Out) Connect an external sound system with coaxial cable to the SPDIF out jack
on the back of your TV to the SPDIF IN jack and to the amplifier or receiver.
* SPDIF
Sony/Philips Digital Interconnect Format. SPDIF is mostly used to transmit compressed multichannel audio from a
media player to an amplifier/receiver.

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3. Input / Output Specification
3.1 RGB Signal Input
15 - Pin Color Display Signal Cable
Pin No. Description Pin No. Description
1 Red Video 9 No Pin!
2 Green Video 10 Sync Ground
3 Blue Video 11 RXD
4 TXD 12 Serial Data for DDC
5 Ground 13 H-Sync.
6 Red Ground 14 V-Sync.
7 Green Ground 15 Serial Clock for DDC
8 Blue Ground
3.2 HDMI Digital Connector Pin Assignments
Pin No. Description Pin No. Description
1 TMDS Data2+ 2 TMDS Data2 Shield
3 TMDS Data2- 4 TMDS Data1+
5 TMDS Data1 Shield 6 TMDS Data1-
7 TMDS Data0+ 8 TMDS Data0 Shield
9 TMDS Data0- 10 TMDS Clock+
11 TMDS Clock Shield 12 TMDS Clock-
13 CEC 14 NC
15 SCL 16 SDA
17 DDC/CEC Ground 18 +5V Power
19 Hot Plug Detect