AOC L37W781B Schematic

37’’ LCD TV AOC L37W781B

1

CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

6.3.IR Board………………………………………….......34

Table Of Contents.......……..............................…........1

Service

Service

Service

31.5KHz to 48KHz

TABLE OF CON TENTS

Description Page Description Page

Revision List.…........................................……......2

Important Safety Notice.......................................……......3

1. General Specification..............................………........4

2. Operating Instructions…………………….……….......5

2.1. The Use Of Remote Control…….………….…….......5

2.2. To Use The Menu…...…………………….……….....7

2.3. How To Connect…….…………………….……….....16

2.4. Front Panel Control Knobs……………….……….....19

3. Input/Output Specification…………....................…....20

4. Mechanical Instruc tions…………………….................22

5. Repair Flow Chart ……………………….…….…….....27

6. PCB Layout ………………..………………....…….......31

6.1.Main Board…………..………….………...............31

6.2.Power Board……………..………….……….......33

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

6.4.Side Board…………………….………..……….......35

6.5.Key Board……………………………….……….......35

6.6.Tuner Board…………………………….……….......36

7. White-Balance, Luminance Adjustment...................37

8 Block Diagram.……...........................................39

9. Schematic……………...…….……..………………..40

9.1 Main Board…….………..….…………….….......40

9.2. Power Board…………….……….………….......47

9.3.Key Board……….……….……….………….......48

9.4. Tuner Board…………….…….…….………….......49

9.5. Side Board…………….………..….………….......53

10. Exploded View..……………..........................…..54

SAFETY NOTICE

11. BOM List……………….………………….………….56

12.Different Parts List……………………………………93

Horizontal Freq uency

CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.

37’’ LCD TV AOC L37W781B

2

Revision List

Version Release Date Revision Instructions TPV Model

A00 Oct.-05-2007 Initial Release E377ATNB2WACNN

A01 Sep.-28-2008 Add ne w BOM E377ATNB2WAC2N

37’’ LCD TV AOC L37W781B

3

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 equ ipment. It is als o impor tant to under stand that thes e CAUTI ONS and N OT ICES A RE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the ser v ice tr ade of al l conc ei vable ways in
which service might be don e or of t he poss ible hazar dous conseq uences of each w ay. Consequently, AOC has not
undertaken any such broad ev aluation. According ly, a servicer who uses a ser vice procedure or tool which is not
recommended by AOC m ust 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 shou ld the original design be m odified or altered without written permiss ion 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 pres s o n the panel wit h a ny sharp objects, suc h as pe ncil or p e n as t h is may result in dam age t o
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.)

37’’ LCD TV AOC L37W781B

4

37”Wide screen

HDMI

Screen Size

37”
TFT-LCD Panel

Contrast Ratio

1200:1

Brightness

500cd / ㎡

Response Time

8ms (Grey to Grey)

Lamp Type/Life

60000 hr

Tuning

PAL B/G, D/K, I and SECAM D/K, L/L’
Full Channel with Electroni c PLL Tuner

COFDM Band Width: 7/8 MHz Form at: MP @

4:3, 16:9 Picture Resolution:

720×576i

Analog

Nicam / A2

MPEG(I & II) Sample rate:32/44.1/48KHz
Mode: Mono, Stereo, Dual

Teletext

Yes (252 Pages)

Color systems

PAL / SECAM

Signal Input

D-SUB

PnP compatibility

DDC2B

FH: 31.5KHz to 48KHz
FV: 56Hz to 75Hz

1024 x 768 @ 60Hz, (up to 1280 x 768 @
60Hz)

Input Audio

Headphone Mini-jack for stereo (3.5ø)

Items

Speaker (built-in): 15W＋15W

Headphone Mini-jack for stereo (3.5ø)

Line Output (RCA L/R)

DTV S/PDIF(RCA COAXIAL)

English, Germany, Italian, French, Spain,
Portuguese

Table Stand

Included

Wall Mount

Yes

Power Supply

AC100V~240V, 50/60Hz

Power Consumption

< 230W

Panel Tilt

Forwards/Backwards/ Rotation

None

928.90mm

254.84mm

Weight (net)

Kg (w/o Accessories)

17.45KG

Remote controller, Batteries (x2), AC Power
cord, Operation manual

Video Inputs

SCART1
SCART2

21 Pin SCART (RGB & CVBS) ×1, (S-Video or
CVBS) ×1

HDTV

Y Pb Pr×1 Audio L/R ×1

CVBS (Composite) ×1

HDMI1

HDMI x 1 (Audio/Video with HDCP)

HDMI2

HDMI x 1 (Audio/Video with HDCP)

1. General Specification

Feature

Items Specification

LCD Panel

TV Function

Built-in Full channel Tuner(DTV, Analog)
with DVB-T , Nicam, T eletext.
Graphic (D-SUB)

Analog

TV
System

Sound
System

Digital

Digital

(Multi-Europe)

ML
Aspect ratio:

PC Input

Audio Output Audio Output: L / R

OSD language

Power

Dimension W x H x D (with stand)

Accessories

Input frequency

Recommended

Specification

681.45mm

AV/SV(Side)

S-Video ×1
Audio L/R ×1

37’’ LCD TV AOC L37W781B

5

POWER:

DISPL AY

< > button

2. Operating Instructions

2.1. The Use of Remote Control

Use of the remote control

Press to turn on/off the TV. The
TV is never completely
powered off unless it is
physically unplugged.

VIDEO

Press this key you could select
AV1, S-VIDEO, HDTV and
HDMI.

SCART

Press this key you could select
SCART 1，SCART2，and
SCART2-S.

0~9 DIGIT BUTTONS

To select a TV channel.

SUBPAGE

Teletext Sub-page function.

Source

Select your input source from
list, according to where you
connected your external
source.

SOUND

To select Mono/ Stereo/Dual
from TV RF input.

DTV MENU

Press this key to display DTV
menu.

Zoom +,-.
Press these key to select
desired picture format.
(4:3, CINERAMA,16:9……)

VOL
Press + or – to increase or
decrease the volume.

MENU
Press this key to display main
menu.

Press this key to display:
(1) the channel number when

watching a TV program.

(2) the input source when

watching an AV program.

MUTE

Temporarily interrupt the sound
or restore it.

PC

Display PC mode

TV

Display TV or DTV mode

PRE-CH

To display the previously
selected TV channel.

EPG

Press this key to display
electronic program guide
screen in DTV mode.

SLEEP

With this key you can set a
time period after which the TV
should switch itself to standby.
Press the key repeat ed l y to
select the number of minutes.
The counter runs from 15, 30,
45, 60, 90, 120 minutes. The
timer begins to count down
from the number of minutes
selected after the display has
disappeared.

CH

/

Use this button to
confirm selection or
adjust the desired
parameter.

button

When in menu mode,
use this button to select
to the up/down.
OK
Press this KEY to
validate your selected.

Press + or - (or MENU
button) buttons to scroll
through the channels.

EXIT

Press this key to exit main
menu.

37’’ LCD TV AOC L37W781B

6

TELETEXT

MIX
SIZE

RED / GREEN / YELLOW / BLUE

Teletext screen.

INDEX

INDEX

SUBTITLE

HOLD
REVEAL

PAGE SELECTION

i INFO

SUBPAGE ACCESS

Teletext

Teletext is an informat ion service organized lik e a magazine, which is provided by some T V stations in addition to
regular television broadcasting.

Press TELETEXT. The Teletext screen appears.

Press MIX to superimpose the teletext over a normal
broadcast picture. Press again to return to Teletext
mode.

Press SIZE repeatedly to display the upper teletext part, the
lower teletext part and then to return to the normal.

Use the COLOURED BUTTONS to operate the

Press i-INFO to show DTV information.

Press

Press to select the nex t page m arked as a subt itle
page and request it as the display page.

Press HOLD to hold the T eletext page when viewing
information. Press again to return to automatic page
update.

Press REVEAL to disp lay reveal hidden words e.g. quiz
page answers. Press again to hide.

to return to the main index page.

Page can be selected in two ways.
a. Press ▼or ▲ to increase or decrease the page number by one.
b. By entering the page number, using digit buttons 0~9.

When Teletext information exceeds more than one page, press
SUBPAGE first then select the required page number using digit
buttons 0~9.

37’’ LCD TV AOC L37W781B

7

2.2 To Use the Menus

1. Press the MENU button to display or close main menu.

2. Use the cursor up/down to select a menu item.

3. Use the cursor left/right to enter a submenu or enable/disable the
function.

4. Press the MENU button to exit the menu

Main Menu

Press the MENU button to enter the main OSD (On Screen Display). Adjust the items including Picture Setup,
Sound setup, Options Setup, Installat ion Setup( TV setup) and PC Setup(only in pc mode).

Picture Setup:

.

Preset: choose between Standard, Mild, Personal, Vivid.
Personal gives access to following adjustments.
Contrast, Brightness, Color, and Sharpness: adjust these settings as required using the < / > buttons.
Tint: This option is only available for NTSC audio-visual sources.
Reset : Return to default settings. Press OK or < / > buttons to return to default settings.
Press the MENU button to exit the Picture menu.
Note: this menu is removed automatically after a few seconds without using the remote control.

When you adjust a menu option (Contrast for example), the menu is replaced by a sub-menu as illustrated.Press the
OK button to return to the Picture menu.
Sound Setup :

Balance: adjust the balance between left / right channels as required using the < / > button.
Bass: adjust the bass level as required using the < / >button.
Treble: adjust the treble level as required using the < / > button.
SRS WOW : Using < / >, activate(On) or deactivate(Off) SRS function.
SRS is an audio technology which improves the sound quality.
Reset: Return to default settings. Press OK or < / > buttons to return to default settings.
Press the MENU button to exit the Sound menu.

37’’ LCD TV AOC L37W781B

8

Note: this menu is removed automatically after a few seconds without using the remote control.
SRS WOW, SRS and (0) are registered trademarks of SRS Labs, Inc.
This product is designed using SRS technology with permission from SRS Labs, Inc.

Options Setup:

This menu allows to select the language for the menus as well as the colour of the screen when there is no video
input. It allows also to set an automatic shut-off time.
Menu Language : To select the language for the menus.
Menu Timeout : To set an automatic shut-off time for Menu. Using < / >buttons select 5>10>20>30>40>50 seconds.
Menu Background : Select Opaque or Transparent type.
Sleep Timer : To set an automatic shut-off time. Using < / > buttons select Off >15>30>45>60>90>120 minutes.
Once the time is ended, TV set automatic switch on standby mode.
If you turn the TV on standby mode after setting the sleep timer, setting will be erased. Set it again.
Bule screen : To have a blue screen when there is no video input or when the RF signal is very bad.
Using < / > buttons select On.
Select Off if you do not want the blue screen.
Teletext Language : Using < / > buttons, select the character set that will be used for Teletext on this channel.
The character set determines how characters are displayed on Teletext screen.
Reset : Return to default settings. Press the OK or < / > buttons to return to default settings.
Press the MENU button to exit the Options menu.
Note: this menu is removed automatically after a few seconds without using the remote control.

37’’ LCD TV AOC L37W781B

9

PC Setup :

In PC Setup, main menu is different from the one in TV Installation Setup(TV setup). Please select PC as main input.

H Position: use the < / > buttons to move the picture horizontally on the screen.
V Position: use the < / > buttons to move the picture vertically on the screen.
Phase: use the < / > buttons to move the picture phase on the screen.
Auto Sync: this function is used to automatically adjust the VGA input. Press the < / > buttons to start the adjustment
process.
Color temp. : to select the color temperature at your convenience.
Reset: Return to default settings. Press the OK or < / > buttons to return to def ault s ettin gs .

Installation Setup :

I

nstallation Setup involves s electing all th e settings r equired to be abl e to search for and stor e all the channels you
can receive.
Make sure that the television is switched on and follow all the steps in turn specified on this page.

Auto. Installation : Select Auto. Installation. Press OK button to display the

Auto. Installation.

Country : Select the relevant country using the < / > buttons.
This is the country you are in, or the country whose channels you want to
receive if you live near its borders. If you do not find your country , select Auto.

37’’ LCD TV AOC L37W781B

10

Start : Press the OK button to start channels searching.

Select Man. Installation using the \/ button.
Press the OK button to display the Manual. Installation menu.
Use the ^ / \/ buttons to select each option.
Prog. Number : Allow to select the program on which you want save a new
channel or a program you want to modify.
Using the < / > buttons, select the program.
Frequency : Allows to enter a specific frequency for tuning.
Using the \/ botton, select the Frequency option and press the OK button. Using the 0-9 digit and the < / > buttons,
enter desire frequency and press the OK button.
Name : Allows to edit the channel name.
Using the \/ button, select the Name option.
Using the > botton select the first letter field.
By pressing the 0-9 digit repeatedly and using the following table select the first character.
Repeat the procedure for each letter field.
Press the OK button to confirm.

Store prog. : Allows to Save a channel on a new Program No., to Insert a
channel on an already existing Program No.(the channel previously saved
on this program no. will be shifted to the upper program no.) or to Delete the
Program No.
Once a channel has been found and named, use the \/ botton to select the Store prog. option.
Using the < / > buttons, select Save, Insert or Delete and press the OK button
to confirm.

Swap prog : Allows to swap 2 programme numbers.
Using the ^ / \/ buttons select the Prog. number option.
Using the < / > buttons, select the program to be moved.

37’’ LCD TV AOC L37W781B

11

Using the \/ button, select the Swap prog option.
Using the OK button, enter the swap function.
Using the 0-9 digit, enter the new programme number(3 digits).
Press the OK button to confirm, the programme numbers are swapped.

Norm : Allows to change the audio norm.
Using the \/ button, select the Norm option.
Using the < / > buttons, select the norm.

Note : the following norms are available to choose from : I for the UK and Ireland, L/LP for France and Luxembourg,
D/K for Eastern Europe, the Middle
East and Asia, B/G for Western Europe, Australia and New Zealand.

Skip : Allows to skip a channel.
Using the \/ button, select the Skip option.
Using the < / > buttons, select On, the channel will be skip.
Skip : Allows to skip next channel when it is on, and Using the < / > buttons,
select store prog: ok.
Repeat this procedure to skip other channels.

Fine tuning : If the picture is not clear, you can adjust the setting.
Using the \/ button, select the Fine tuning option.
Using the < / > buttons to find the good tuning point.

Manual Search : Allows to launch a manual search.
Using the \/ button, select the Manual Search option.
Using the < / > buttons, start the search in decreasing or increasing order.

The search will stop at the first channel found.
If you wish to memorise the channel, select Store Program option using the
^ button and proceed as indicated in previous page. Otherwise, continue the
search using < / > buttons.

37’’ LCD TV AOC L37W781B

12

Main Menu

Channel list

Favourites

Guides

Settings

Common Interface

INPUT SELECTION

To select TV/VIDEO source:

To select desire input source, press the SOURCE button to display the
selection menu.
Using the ^ / \/ buttons to select each input sources.
Press the OK button to display the desire input source.

DTV MENU

First-Time Installation

When the system is first switched on, t he R ef erenc e A ppl icati on attempts to configure itself f or t h e f irs t t ime. This is
called ”First Time Installation”.
The user is then asked if they wish to perform an automatic tune for services. Automatic tuning function ality is
described later in this document. When the automatic tune finishes and services have been found, the lowest
number service is selecte d and a banner describ ing that ser vice is sho wn. A user may have chosen not to p erform
an automatic tune or no services may have been found by an automatic scan. In this instance the user may use the
“Main Menu” to au tomatically scan agai n or perform a manual scan. The R eference Applicatio n also provides the
facility for the user to f orce to trigger a “F irst Time Installation” . This f acilit y can be f ound in t he “Ma in Menu” under
the “Installation” option.

A “Main Menu” is provided to enable the user to configure elements of the Reference Application. In “normal
viewing” operation a user can access the “Main Menu” by pressing the “DTVMENU” key. The “Main Menu” is
hierarchically organized into categories in order to fit on the screen.

Channel List

A user may configure the Reference Applica tion to use ex clusivel y TV, Radio or Data services, th is feature is know
as channel List Model.
A user can select a channel List Mode us ing the configuratio n dialog; it is perm itted to select a ch annel List Mode
that contains no services.
When the channel list mode is enabled the program up and down buttons on the remote control will only select those
services in the current c hannel List Mode. And all EPGs will only show those se rvices in the current Ch annel List
Mode. It is st ill possible to select a service using th e services even if it is not a member of the currentl y selected
channel List Mode. Note th at if the us er has s elec ted a favourites list then the Channe l List Mod e acts as a f ilter on
top of the selected favourites list.

37’’ LCD TV AOC L37W781B

13

Guides

Now/Next EPG

List Schedule EPG

Time line schedule EPG

Settings

Configuration

Language

Installation

Please press the OK button on your remote control to tune to the highlighted channel. Press DTV MENU to exit this
screen.

Edit Favourites Lists

A favourites list enables th e user to selec t a subset of s ervices the y consider favourite. T he Reference Application
allows the user to have up to five different favourites lists. Favourites lists are defined in t he favourites dialog that
can be accessed by selecting the favourites button on the channel list dialog and via the Main Menu.
Press the OK button on your remote c ontrol to add the chann el to the highlighte d favourites list. An ic on indicate s
which favourites list a channel is in.

Now/Next EPG
An EPG dialog is provided that allows the user to view the current and next programme playing on each service.
In this dialog a list of channels and the correspondin g current and next programmes is displa yed. The user can
navigate up and down the list of channels and highlight either the now or next programme. Information for the
highlighted programmes can be displa yed by pressing “Info”. T his information includes the start/end time of the
programme, the programme genre in brackets, and a synopsis of the programme content.
A user may select a service by highlighting a program in the ‘now” list and pressing the “OK” key.
Pressing the “SUBTITLE” key the user may select a genre to highlight events with the selected genre in the EPG.

The Now/Next Electronic Program Guide cannot be accessed if there are no services available.

List schedule EPG

User can set up Program schedule list

Time Line Schedule EPG

Extended Schedule EPG information is presented using a list format, either on a banner for the current service, or as
a full screen dialog showing multiple services.

Configuration
Time Zone: Press RIGHT/LEFT to select the tim e zone you are in. Press DTV MENU to ex it this screen. (Inc.

GMT/CET)

DST: Press RIGHT/LEFT to select or deselect DST mode, Press DTV MENU to exit this screen.
Subtitle: Press RIGHT/LEFT to select subtitle on or Off, Press DTV MENU to exit this screen.
Banner: 2/4 seconds.
Favorite Mode: Press RIGHT/LEFT then select to choose favourite mode. Press DTV MENU to ex it this screen.

Please remember that at least one favourite channel be selected before turning favourites on.
Channel List: Press RIGHT/LEFT then se lect to choose channel lis t mode, you can select show all channel, TV

only , Radio only and Text only, Press DTV MENU to exit this screen.
Parental Settings: Press SELECT to enter the parental lock menu. Press DTV MENU to exit this screen.
If you don’t know how to use above function, you can select i info button in remote control for get information, press

i info button again will exit.
Language Settings

System: To change the system languages, this changes the language used in all menus and dialogs.
Noted: Pan Europe system language include: English, German, French, Italian, Spanish, Danish, Norwegian,

Swedish, Finish , Por tuguese, Polish and Dutch.
UK system language includes: English, Welsh and Gaelic.

37’’ LCD TV AOC L37W781B

14

Installation

Automatic Search

Manual Search

First Time Installation

Manual tuning:

Do you want to start automatic search? Your

YES

No

Audio: Displays a dialog enabling the preferred language to be set, this is the language to be used for all channels if
it is available.

Subtitle: Displays a dialog enabling the preferred language to be set, this is the language to be used for all channels
if it is available.

Current: Displays a dialog enab ling the curr ent langua ge to be set, this is the languag e to be used f or the current
selected channel, please note that only languages available with the currently selected channel will be displayed.

Automatic Search

Automatic search is the ability for the reference application to scan each other (Frequency) for services.
Whilst performing an auto matic tune no service will b e selected. A dialog is displayed during automatic tuning that
shows the progress of the scan through the channels.
The user ma y cancel auto m atic tunin g. If th e pre vious list alre ad y stored, t he lo west num ber f rom the serv ice lis t, it
will return to “normal viewing” operation.
The Reference Application can support up to 70 services at any one time.
When you select Automatic search, press OK button in remote control, and will start to automatic search.

Previous channel list will be replaced.

Manual search

Manual Search

Manual search allows the user to scan an individual channel (frequency) for services .The user can perform a
manual tune by selecting an option on the “Main Menu”. Whilst performing a manual tune no service will be selected.
The user enters the channel number to be scanned; only those channels supported by the tuner may be entered.
The Manual tuning dialog displays a bar indicating the q uality and strength of the signal of the currently selected
channel. The user can then choose to scan the selected channel for services; a separate dialog is displayed
showing the service f ound whilst scanni ng is taking place. N ewly discovered s ervices are merged with the current
list of services. The user may cancel manual tuning; in such cases any newly discovered services are disregarded.
When a manual tune is c om plete the applicat ion will att empt to selec t the pre viousl y selected ser vice and retur n to
“normal viewing” operation. In cases were there was not a previously selected service the application will attempt to
select the service with the lowest number.
The Reference Application can support up to 70 services at any one time.
Press 0 to 9 to select a channel number; select to start searching

First time installation

Channel Number:

Signal Quality:
Signal Level

for channels, DTV MENU to exit this screen.

37’’ LCD TV AOC L37W781B

15

Are you sure your want to delete all channels and

YES

No

Choose this will re turn to the original condition, you can choose country as f irst time in installation. And s earch
channel again. When you select it, you will see as following:

settings for first time installation?

Common Interface

Common Interface

If no CA module is inserted, then the system display “No common interface mode detected”.
If a CA module without a smartcard is inserted. Then the system displays “Please insert your smartcard.
If a CA module with a smartcard is inserted. Then the CI menu is displayed. Using this menu. The user can read the
smartcard contents. The data shown depends on CA vendor and CA smartcard version.

37’’ LCD TV AOC L37W781B

16

2.3 How to Connect

Lay the LCD TV with the screen down o n a table, as it wil l be easier to connect your peri pheral equ ipment. Please
take your precautions not to damage the screen.

1: Audio output
2: SPDIF output
3: SCART2(CVBS)/SCART2-S
4: SCART1(RGB/CVBS)
5: DTV
6: ATV
7: Component video(HDTV)
8: Component Audio
9: VGA
10: VGA Audio input
11: HDMI2
12: HDMI1
13: AC power
14: S-Video
15:AV1 (CVBS)
16:AV1/S-video Audio intput
17: HEADPHONE

37’’ LCD TV AOC L37W781B

17

CAMERA CAMCORDER VIDEO GAME SET

How to connect

1. Connect the antenna cable to the RF IN port of your VCR.

2. Connect another RF cable from the port of your VCR to the antenna port of you ATV set. If you have connected

the video/audio cable to the video AV port, you may have better sound and picture when playing the VCR .

If your VCR has an S-VHS video jack:

For improved picture quality, connect a S-Video c ab le with the S-Video input on the ATV.
S-Video does not provide audio, audio cables must still be connected to provide sound(AV and S terminal share one
audio input).

Watching VCR

1. If you use connection ATV, select the TV channel auto search.

2. If you use connection AV, select video AV1 input.

3. Insert videotape in the VCR and press the PLAY button.

SCART CONNECTION

How to connect

1. The SCART socket can be conn ected a VCR, a camcorder, a DVD player, a satellite rece iver, a decoder or a

game console form SCART cable.

2. The 21pin SCART socket can also be used as an output to Audio/Video equipment.

How to use

Scart source has the f irst priorit y. For example: when playing un der other sources such as TV/AV/S-Video/VGA, if
we input the scart signal, the TV will switch to Scart menu automatically.

CAMERA CAMCORDER VIDEO GAME SET

How to connect

1. Connect the camera, camcorder and game set to the ports of the audio/video set.

2. The camcorder may get better picture by connecting a S-VHS cable between the S terminal and the Audio set.

How to use it

1. Select the video AV or S terminal input.

2. Enable the exterior AV equipment.

Warning: In case you notice scrolling images, wrong colors or no color, no picture or even combinations of these, on
your screen, check if the connections are done in the right way. Check if the cable colors match with the Input
connector colors.

37’’ LCD TV AOC L37W781B

18

WALL MOUNT

Use of Wall Mount Bracket:

1. Remove the hinge cover.

2. Remove the four units M4.0 screws.

3. Remove the base ass’y.

4. Fasten four units M6.0 X 10mm screws to secure the wall mount bracket.

HEADPHONE

1. The headphone jack is located at the side of the TV.

2. The MUTE key on the remote control works on both internal speaker and the headphone.

3. Use volume key to adjust the volume.

TIPS

T

Care of the screen

Do not rub or strike the screen with anything hard as this may scratch, mar, or damage the screen permanently.
Unplug the power soc k et bef ore clea ning the s cr een. Dust th e T V by wi ping the sc reen and t he c abinet wit h a s oft,
clean cloth. If the screen requires additional cleaning, use a clean, damp cloth. Do not use liquid cleaners or aerosol
cleaners.

Mobile telephone warning

To avoid disturbances in picture and so und, malfuncti oning of your T V or even dam age to the TV, keep away your
mobile telephone from the TV.

End of life directives

We are paying a lot of attention to produce environmentally friendly in green focal areas. Your new receiver contains
materials which can be recycled and reused.
At the end of its life specialized companies can dismantle the discarded receiver to concentrate the reusable
materials and to minimize the amount of materials to be disposed of.
Please ensure you dispose of your old receiver according to local regulations.

37’’ LCD TV AOC L37W781B

19

2.4 Front Panel Control Knobs

1, 2: + / - Key : Press to confirm your function selection and adjustment.
3, 4: Up / Down Key : Press to perform select function and channel.
5: MENU Key : Press to show the OSD menu and exit OSD menu.
6: Source Key : Press to select your input source.
7: Power Key : Press to turn on or off the TV.

37’’ LCD TV AOC L37W781B

20

Not Used

Serial Data for DDC

Composite Video

Video system

NTSC/PAL/SECAM

Amplitude

1.0Vpp (including sync )

S-Video

Video system

NTSC/PAL/SECAM

Y signal amplitude

1.0Vpp (including sync )

Impedance

75 ohm terminated

SCART (RGB)

Video system

PAL/SECAM

R/G/B signal amplitude

0.7Vpp

CVBS signal amplitude

1.0Vpp (including sync )

Impedance

SCART (Composite)

Video system

PAL/SECAM

Amplitude

1.0Vpp (including sync )

Impedance

75 ohm terminated

HDMI

( EIA/CEA-861B )

Component

1.

480 I SDTV)

15.734K / 60 HZ

480 P (SDTV)

3.

576 I (SDTV)

15.625K / 50

1080I /60 (HDTV)

6.

1080I /50 (HDTV)

28.125K / 50

1

6

11

15

5

10

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 Not Used
4

12
5 Ground 13 H-Sync.
6 Red Video Ground 14 V-Sync.
7 Green Video Ground 15 Serial Clock for DDC
8 Blue Video Ground

3.2 CVBS/S-VIDEO/ SCART /COMPONENT/HDMI INPUTS

Impedance 75 ohm terminated

C signal amplitude 0.286Vpp

75 ohm terminated

2.

4. 576 P (SDTV) 31.250K / 50

5.

Output Formats H/V Frequency

31.469K / 60

33.750K / 60

37’’ LCD TV AOC L37W781B

21

HDMI

( EIA/CEA-861B )

Dots × Lines

Horizonta

Horizontal

Vertical

7. 720P /60 (HDTV) 45.00 K / 60

8. 720P /50 (HDTV) 37.50 K / 50
640*480/60Hz

3.3 Compatible Mode Table

Horizontal Vertical Sync Polarity Presence Screen Mode

Frequency Frequency

(kHz) (Hz) (4:3) (16:9)

720×400 31.47 70.08
640×480 31.50 60.00
640×480 37.50 75.00
640×480 37.86 72.81
800×600 37.90 60.32
800×600 46.90 75.00

800×600 48.08 72.19
1024×768 48.40 60.00
1280×768 47.7 60

Vertical

NEG POS YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES

YES YES YES YES YES YES
YES YES YES YES YES YES

Normal FULL

37’’ LCD TV AOC L37W781B

4. Mechanical Instructions

1. Preparation

2. Remove the screws remarked in red to remove the base and rear cover

22

37’’ LCD TV AOC L37W781B

3. Remove the screws remarked in red to remove shield

23

37’’ LCD TV AOC L37W781B

4. Remove the screws remarked in red to remove the panel.

5. Remove the screws remarked in red to remove the boards.

24

37’’ LCD TV AOC L37W781B

6． Remove the screws remarked in red to remove PCB BKT

7． Remove the screws remarked in red to remove panel BKT and bezel

25

37’’ LCD TV AOC L37W781B

8. The End

26

37’’ LCD TV AOC L37W781B

NG

Check power cord and board interface

Plug in power cord and interface

OK

Check F901, BD901, D902

NG

Replace F901 or BD901 or D902

OK

Check IC903, IC902

Check Q902 ,Q903

NG

Replace IC903 IC902

OK

Check IC901，Q901,

OK

Replace IC 901，Q901

Replace Q902,Q903

OK

NG

NG

Check T901,T902

NG

Replace T901,T902

Check D905，D906， D914， D918

Replace D905，D906,D914,D918 ,
IC908

OK

NG

NG

Repair the key board

OK

Check 5V SB

NG

Return to “1”

OK

Check PWR ON signal

NG

Check Q706, Q703

NG

Replace Q706, Q703

OK

Check U203, U401

NG

Replace U401 or U203

OK

OK

Check main board power supply part

Check key board

Check I2C communication

5. Repair Flow Chart

1. No Power (No LED indicator)

IC904.IC907,IC908

2. Can not start (LED indicator yellow)

IC904,IC907,IC908 IC904. IC907,

27

37’’ LCD TV AOC L37W781B

Check the source

OK

Reset source

NG

Check signal filter circuit

NG

Replace the filter or inductance

OK

NG

Analog TV signal

Check TV system setup

OK

Check TU1

Replace T1

Component, PC signal

Check U202

NG

Replace U202

OK

Check U401

NG

Replace U401

OK

NG

Replace U1

Check U1

Digital TV signal

Check TV system setup

NG

Check TU1

OK

NG

Replace U4

OK

Power supply U4

Check U21

Check U6,U7

Check U12,U17

OK

OK

OK

Check U9,

HDMI

Check u504

Replace U504

OK

OK

Check panel

Replace TU1

OK

3. Abnormal display

28