AOC LE32A3520-61 Schematic

32″ LCD TV AOC LE32A3520/61

Service

15.326~67.5 KHz

TABLE OF CONTENTS

Description Page Description Page

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

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS

SAFETY NOTICE

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

Horizontal Frequency

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

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.)

Revision List

Version Release Date Revision Instructions Customer Model TPV Model

A00 May.28,2012 Initial release

LE32A3520/61 E32C1KNCASA1NNX

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.

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.

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 Input source contains:TV,AV1,AV2,YPbPr,VGA ,HDMI1,HDMI2,HDMI3,USB.

Press the OK.

button to select desired input source.

How to select on screen Menu items

Press the MENU button to display main menu

Picture Setting

Press the

setup,

Channel setup and

Press the 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.

icon for sound setup, icon for feature setup, icon for

and button to select the desired menu item and then press

button to select required menu icon for picture

icon for USB media setup.

Main menu Sub Menu Functions Description

Standard

Cinema

Vivid

Mild

Sport

Game

Brightness Brightens or darkens the picture.

Contrast Increases or decreases picture contrast.

Color To add or reduce color.

Personal

Tint Video tint adjustment, Can only select with NTSC signal.

Sharpness To improve details. Not available in PC mode.

Backlight

For standard picture settings. Recommended for home entertainment.

For viewing film-based content. Most suitable for viewing in a theater like environment.

For Enhances picture contrast and sharpness.

Optimizes video for viewing more mild.

Optimizes video for watching sports event.

Optimizes video for playing game and entertainment content.

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.

Adjust the balance between left and right speakers to adapt to your listening position.

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

Personal

Balance

300Hz

1KHz 3KHz 8KHz

15KHz

Settings Menu

Main menu Sub Menu Functions Description

Channel Search

Other Adjustments

Sound and OSD

System Reset

Channel Search

This setting is only available in TV mode.

Auto Search, Update Search,

Manual Search

Password Setting. TV Lock,

Blue Screen, Sleep Time,

Zoom, Noise Reduction, DCR,

DCC, HDMI/DVI Switch

Language, Menu

Transparency, Menu Timeout,

DSS Effect, AVL, Sound Mode.

Auto Adjust, H. Position, V.

Position, Phase and Clock

Please refer to“Channel Search” (p19,p20)for details.

Please refer to “Other Adjustments” (p21) for details.

Please refer to “Sound and OSD” (P22) for details.

Please refer to “PC setup” (p23) for details.

You can restore the factory default picture and sound settings of your TV. The channel settings and TV lock remains the same.

Main menu Description

TV automatically searches for the channel in the available frequency band and stores sequentially.

Auto Search

Update Search

Manual Search

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.

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.

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. 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.

Menu Function Description

Channel NO. Press the ◄/► arrow button to select desired channel number.

To Enter a name for the selected channel. Press ► arrow button and then press ▲/▼ arrow button to select a character.

Channel Name

Fine Tune

Color System

Sound System

AFC

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. 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. 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. 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. 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.

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

Menu Functions

Password Setting

TV Lock

Blue Screen

Sleep Time

Zoom

Noise Reduction

DCR

DDC

Description

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. 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. 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 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. 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. 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. 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. 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

* 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

Select the required color system. Available only in AV source.

Menu Function Description

Language

Menu Transparency To set Menu Transparency (0%~100%).

Menu Timeout Set time duration for OSD display.

DSS Effect

AVL

Sound Mode

PC setting

Select required Language. English will be the default OSD language.

It can create the perception that there are many more sources of sound than are actually present, Automatically reduces sudden volume changes, for example , when switching between the channels, 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.

Menu Functions Description

Auto Adjust

H. Position Adjusts the horizontal position of the picture.

Press ► arrow button to adjust the screen automatically to the optimal 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.

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

▲/▼/◄/► 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.

Direct USB key on remote to get USB Media menu as shown above Or Press the Source key and

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

stop slideshow

key to play/pause slideshow. Press to view previous or next image. Press key to

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

Music play.

USB menu settings for Music play

key to play/pause music. Press to play previous or next track. Press key to stop

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

stop video play.

USB menu settings for Video play

key to play/pause video. Press to play previous or next video. Press key to

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.

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

Format File Extension Codec Date Rate

Video

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.

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

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

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

2.4 Front Panel Control Knobs

Controls & Connections

Controls

Item Description

1. VOL+/-

2. CH

3. MENU

4. INPUT

5. (Power)

Connections

Item Description

AV(Audio/Video)Input

Video Output

HDMI Input

PC VGA IN (RGB)&PC Audio IN

Component input

Connect audio (L/R)/video output from an external device to these jacks

For connecting the Composite Video signal of the TV to other display devices as their source signal.

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. 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. Connect a component video (YPbPr) / audio (L/R) device to these jacks. Component provides better picture quality than the composite video connections.

Press to increase or decrease the sound volume level.

Press to select the next higher or lower program number.

Press to open or exit the OSD menu.

Press to select the input source.

Switches the product on/standby or off. The product is not powered off completely unless it is physically unplugged.

TV Antenna input

USB

SPDIF (Coaxial Digital Audio Out)

* SPDIF

Sony/Philips Digital Interconnect Format. SPDIF is mostly used to transmit compressed multichannel audio from a media player to an amplifier/receiver.

The RF input is for connecting to the cable or VHF/UHF antenna.

Connect USB storage device to enjoy Photos, Music and Videos.

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.

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

3.3 compatible mode table

PC Input Signal Reference Chart

Connect a computer to your TV set and set up the computer output signal in accordance with table below.

Default computer mode

Standard Resolution Horizontal Frequency(KHz) Vertical Frequency(Hz)

VGA 720×400 31.327 69.617

SVGA 800×600 37.879 60.317

XGA 1024×768 48.363 60.004

WXGA 1360 × 768* 47.72 59.799

DVI/PC HDMI Input Signal Reference Chart

1. When DVI port is being used: connect the DVI port of video device to your TV set with a DVI-to-HDMI line and

set up the output signal of the video device in accordance with table below.

2. When HDMI port is being used: connect the HDMI ports of your computer and TV set with one HDMI wire and

set up the output signal of the video device in accordance with table below.

Default HDMI Mode

Standard Resolution Horizontal Frequency(KHz) Vertical Frequency(Hz)

VGA 640×480 37.879 60.317

VGA 720×400 31.327 69.617

SVGA 800×600 37.879 60.317

XGA 1024×768 48.363 60.004

SXGA 1280×1024 63.981 60.020

WXGA 1360 × 768* 47.72 59.799

*Recommended resolution

Video Input Signal Reference Chart

1. Connect the component signal or HDMI port of video device to your TV set and set up the output signal of the

video device in accordance with table below.

2. If your computer display card supports signals of video format then you can set up following output signal.

Default Component or HDMI Mode

Standard Resolution Horizontal Frequency(KHz) Vertical Frequency(Hz)

720×480i

720×480p

720×576i

720×576p

1280×720p

15.734 60

31.5 60

15.625 50

31.25 50

37.5 50

FHD

Video systems supported by the TV, video modes

PAL D/K B/G I; NTSC M

Standard Definition Interface

You can also enjoy traditional program by using a DVD player or VCR Player. Connect this equipment to your TV via the Composite Input on the back of your TV.

1280×720p

1920×1080i

1920×1080p

45 60

28.125 50

33.75 60

56.25 50

67.5 60