AOC TV2764W-2E Schematic

AOC TV2764W-

VII

LCD TV MONITOR

TV2764W-2E

THESE DOCUMENT S ARE F OR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERROR S OR O MI S SIO NS.

MANUFACTURE DATA ：AUG.-23-2005 Revision：A00

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TABLE OF CONTENTS

PAGE

1. SPECIFICATIONS FOR LCD TV ...........................................................…………...…..

1-1 GENERAL SPECIFICATIONS …................................................…………....…. 2

1-2 OPERATING INSTRUCTIONS ..................................................…………...………….. 3

1-2-1 USE OF THE REMOTE CONTROL ..................................…………....…………… 3

1-1-2 TO USE THE MENUS .............................................…… ……. ……… … … ...… 5

1-3 LCD TV DESCRIPTION ..................................................…………...………….. 8

1-4 INTERFACE CONNECTOR ......................................................………….....…. 8

2. PRECAUTION AND NOTICES .................................................……………..…………

2-1 ASSEMBLY PRECAUTION ..........................................................…………..….

2-2 OPERATIONG PRECAUTION .....................................................…………..….

2-3 STORAGE PRECAUTION …........................................................…………..….

2-4 HIGH VOLTAGE WARNING .......................................................…………...….

3. D-SUB PIN DISTRIBUTION .........................................................................……………

3-1 FACTORY PRESET DISPLAY MODES …………………………………….…..... 11

4. ADJUSTMENT .........................................................................……………...…………

4-1 ADJUSTMENT CONTROL FUNCTION ..............................................……….... 12

4-2 ADJUSTMENTS METHOD .............................................................………….... 12

4-3 FRONT PANEL CONTROL KNOBS ................................................…………... 12

5. TROUBLE SHOOTING CHART ................................................................………….....

5-1 PANEL CONTROL CIRCUIT TROUBLE SHOOTING ………………………… 13 5-2 MAIN BOARD POWER VCC TROUBLE SHOOTING ………………………… 14 5-3 REMOTE CONTROL BLOCK TROUBLE SHOOTING .………………………. 14 5-4 KEY BOARD CONTROL BLOCK TROUBLE SHOOTING ……………………… 15 5-5 PC CONTROL BLOCK TROUBLE SHOOTING ………………………………. 15

5-6 AUDIO CONTROL BLOCK TROUBLE SHOOTING ..............................……… 17

5-7 VIDEO CONTROL BLOCK TROUBLE SHOOTING ......................................... 18

6. WHITE-BALANCE, LUMINANCE ADJUSTMENT ……………………………………...

7. SOFTWARE FLOW CHART ……………………………………………………………...

8. PARTS LISTING OF CABINET (BOM) …………………………………………………...

9. PCB LAYOUT ...………………………………………...........................……………...…

9-1 MAIN BOARD ……………………………………………….. 47

9-2 ADAPTER BOARD PCB ……………………………………………….. 48 9-3 DC TO DC BOARD PCB ...……………………………………………….. 49

19 21 24 47

9-4 HEADPHONE BOARD PCB …………………………………………….. 49 9-5 IR BOARD PCB ...…………………………………….. 49 9-6 KEY BOARD PCB ……………………………………………………… 49

10. SCHEMATIC ........................................................………………………………...

10-1 MAIN BOARD ……………………………………………..… 50 10-2 POWER BOARD ……………………………………………..… 61

11. BLOCK DIAGRAM ........................................................…………………………...

12. DEXPLDING DIAGRAM ...........................................………………………………...

53 64

1. SPECIFICATIONS FOR LCD TV

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

Remote Controller, Batteries (x2), AC Power Cord, User Manual,

1-1 GENERAL SPECIFICATIONS

Items Specifications

Screen Size 27” TFT-LCD

LCD Panel

TV Function

PC Input

Audio Output Audio Output: L / R

Other Function PIP (in PC Mode)

Aspect Ratio 16:9 Display Area (opening) 603.22mm x 341.98mm (H x V)

TV Tuning System

Sound System Nicam / A2 Teletext Yes Color systems PAL / SECAM / NTSC Signal Input Analog: D-Sub 15 pin (detachable cable) PnP compatibility DDC 2B Recommended Analog 1024x 768(60Hz) Input Audio Headphone Mini-jack for stereo (3.5ø)

(Multi-Europe)

Speaker (built-in): Two 5 watt speakers Headphone Mini-jack for stereo (3.5ø) Line Output (SCART L/R)

OSD language English / French / Germany / Italian / Spanish / Portuguese Table Stand Included Wall Mount VESA 100 x 100 mm

Power Supply AC100V~240V, 50/60Hz

Power

Power Consumption 100W. max <140W Panel Tilt Forwards/ Backwards/ Rotation -5° / +20° / ± 35° Dimension W x H x D (with stand) 898 x 470 x 287 (mm)

Weight (net) Kg (w/o Accessories) 13.4 KG

Accessories

Warranty St atement, Quick Setup Card

SCART (RGB+CVBS) x 1,CVBS x 1 Audio L/R x 2 Video Inputs

RCA CVBS (Composite) x 1 Audio L/R x 1

S-Video S-Video x 1 Share with CVBS (RCA)

1-2 OPERATING INSTRUCTIONS

POWER: VOL

CH MENU

SLEEP

key repeatedly to select the runs from 0, 30, 60, 90,120

selected after the display has

0~9 DIGIT BUTTONS

TV/VIDEO

Select your input source: press

MUTE

PRE-CH

SOUND

DISPLAY

SIZE

SWAP

PIP/POP

SUBPAGE

Teletext function and buttons will be described on next page.

1-2-1 USE OF THE REMOTE CONTROL

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

Press or (or MENU ▲ or ▼ button) buttons to scroll through the channels.

Press + or – (or MENU or button) to increase or decr ease the volume.

Select your input source to PC.

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

watching a TV program.

(2) the input source when

watching an AV program.

Temporarily interrupt the sound or restore it.

Teletext Sub-page function.

To select a TV channel.

To display the previously selected

With this key you can set a time period after which the TV should switch itself to standby. Press the

number of minutes. The counter minutes. The tim er begins to count

down from the number of minutes disappeared.

Press to swap the two screens when POP is work (option).

Press this key to display main menu.

Press this key repeatedly to select desired picture format (4:3, CINERAM A,

repeatedly to select TV, AV, S-VIDEO or SCART m ode, accordin g to where you connected your external source.

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

Press this key to display PIP screen (only in PC mode).

POP is not available on this model.

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.

TELETEXT Press TELETEXT. The Teletext screen appears. To turn off the Teletext mode, press TELETEXT again.

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

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

RED / GREEN / YELLOW / BLUE

Use the COLOURED BUTTONS to operate the Teletext screen.

INDEX Press INDEX to return to the main index page.

SUBTITLE Press to select the next page marked as a subtitle page and request it as the display page.

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

REVEAL Press REVEAL to displa y reveal hidden words e.g. qu iz page answers. Press again to hide.

PAGE SELECTION 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.

SUBPAGE ACCESS

When Teletext information exceeds more than one page. Press SUBPAGE fir st then select the required page number using digit buttons 0~9.

1-2-2 To use the menus

1. Press the MENU button repeatedly to display each menu.

2. Use the cursor up/down to select a menu item or adjust the setting of Menu item.

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

4. Press the MENU button to exit the menu.

MAIN MENU

Press the MENU button into the main OSD (On Screen Display). Adjust item include VIDEO, AUDIO, TV (only in the TV mode), PC and PIP (only in the PC mode) and SETUP.

VIDEO Adjust

1. CONTRAST, BRIGHTNESS, COLOUR and TINT are adjusted from 0 to 100.

2. SHARPNESS is adjusted from -5 to +5. You can adjust picture contrast, brightness, color, tint and sharpness to the levels you prefer.

3. RESET is set up to default value.

Note: TINT only work in NTSC video signal input.

When adjust any item sub-OSD will show up like this.

AUDIO Adjust

1. VOLUME is adjusted from 0 to 100.

2. BASS and TREBLE are adjusted from 0 to 100.

3. SRS for turn on / off SRS function. SRS is an audio tec hno logy which improves sound qualit y.

You can adjust picture Volume, Bass and Treble to the levels you prefer.

TELETEXT

When adjust any item sub-OSD will show up like this.

Quick Installation

1. Use COUNTRY to select your country first.

2. Move to SCAN and scan the program.

3. After scan finished, you can use SKIP to skip the unlike program.

PROGRAM Editing

Using PROGRAM, FREQENCY, SWAP, and INSERT for program edit.

1. Move to PROGRAM, select the program you want to edit

2. Move to FREQENCY, use RIGHT or LEFT button for program search.

3. User can use SWAP for program swap.

4. Use INSERT to insert current program into selected position.

SETUP

1. BLUE SCREEN for when no video in put s creen will be blue or bl ank. I f it ’s ON, the scr een wil l be in blu e. If it ’s OFF, the screen will be blank. Preset is ON.

2. LANGUAGE for different language OSD MENU. Preset is English.

3. SLEEP TIM ER is for set a time period af ter whic h th e T V s hould s wit ch its e lf to s tandby. The counter runs f rom

0 > 30 > 60 > 90 > 120 minutes.

The following character sets are available: WEST EUROPE, EAST EUROPE, ARABIC, GREEK, CYRILLIC. The character set determines how characters are displayed on Teletext screen.

5. RESET is set up to default value of BLUE SCREEN and SLEEP TIMER.

Note: To view the remaining time, pres s the SLEEP button onc e. To cancel the sleep time, repeatedly press the SLEEP butto n unt il a notice APPEAR S. If you t urn the TV off after sett in g t he s l eep time, the setting w i ll be er ased. Set it again.

: Using  /  buttons, select the character set that wil be used for Teletext on this channel.

PC Setup

PC Adjust

1. AUTO TUNE is the function auto-sizing for VGA input.

2. CONTRAST, BRIGHTNESS, FOCUS, CLOCK, H-POSITION, V-POSITION and COLOUR are the functions for PC adjustment.

COLOUR

Colour for you can adjust the colour temperature you pref e r.

PIP

1. PIP for turn on / off small picture function.

2. POSITION for change the position of small picture.

3. SOURCE for select video source of small picture.

4. SOUND for select audio source form MAIN (PC) or SUB (Video).

1-3 LCD TV DESCRIPTION

Molded-over, shielded, 15-pin subminiature D male plug with75Ω

ompliance with PC 99 Color Theme. Refer to

D male plug with75Ω impedance. (black)

Molded-over, shielded, 21-pin subminiature D male plug with75Ω impedance.(black)

The LCD TV will contain a main board (inc lude audio) , a switching po wer board (inc lude an inverter board), an IR board, a function k eyboard, an I/O board and a Headphone board. T he main board and pow er board will house the flat panel to control logic I2C bus, DDC, brightness control logic for LCD panel, DC-DC conversion to sup ply the appropri ate power to the whole boar d and transm itting TTL lev el signals into LCD Module to drive the LCD display circuit.

The inverter board will drive the fourteen CCFLs (Cold Cathode Fluorescent Tube). The switching power board will pro vides the power O N/OFF to contr ol the TV and con trol LED indicator for DPMS. The function keyboard and Remote Control will provide the OSD control signal to the Main Board.

1-4 INTERFACE CONNECTORS

All signal connections to this product are via external connectors locating at the rear of the product. The specifications of these connectors are listed in the following table.

External Connector Specification

AC-In AC Jack 3-male receptacle

RGB Input

Audio Input (L/R) RCA Jack (White/Red) Audio Input 3.5 Mini Jack for PC Audio Headphone Output 3.5 Mini Jack Composite Video RCA Jack (Yellow)

CVBS Input S Video 4 Din Jack

impedance. C Appendix B for pin la yout. Molded-over, shielded, 21-pin subminiature

2. PRECAUTIONS AND NOTICES

2-1 ASSEMBLY PRECAUTION

(1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface

by touching with bare hands (Polarize film, surface of LCD panel is easy to be flawed)

In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display

characteristic and reliability. If this panel is subject to hard pressing, the following occurs:

(a) Uniform color (b) Orientation of liquid crystal becomes disorder (2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of it being soiled. (3) Please wipe out drops of adhesive like saliva and water in LCD panel surface immediately.

They might damage to cause panel surface variation and color change.

(4) Do not apply any strong mechanical shock to the LCD panel.

2-2 OPERATING PRECAUTION

(1) Please be sure to unplug the power cord before remove the back-cover. (be sure the power is turn-off) (2) Please do not change variable resistance settings in MAIN-BOARD; they are adjusted to the most

suitable value. If the y are changed, it might happen LUMINANC E does not satisfy the white balance spec.

(3) Please c onsider that LCD backlight tak es longer time to becom e stable of radiat ion characterist ic in low

temperature than in room temperature.

(4) Please pay attention to displaying the same pattern for very long-time. Image might stick on LCD.

2-3 STORAGE PRECAUTION

(1) W hen you store LCD for a long time, it is recomm ended to keep the tem perature between 0°C -40°C

without the exposure of sunlight and to keep the humidity less than 85% RH.

(2) Please do not leave the L CD in the environm ent of high hum idity and high tem perature such as 60° C,

85%RH.

(3) Please do not leave the LCD in the environment of low temperature; below -25°C.

2-4 HIGH VOLTAGE WARNING

The high voltage was only generated by Power support part, if careless ly contacted t he transform er on

this module, can cause a serious shock.

3. D-SUB PIN DISTRIBUTION

Blue Video

GROUND

Horizontal Sync.

Green Video Ground

Data Clock (SCL) for PC Bypass

15510

This procedure gives you instructions for installing and using the LCD TV display.

1. Position the disp lay on the desired op eration and plug the po wer cord into a convenient AC outlet.

Three-wire power cord m ust be shielded and is prov ided as a safety precaution as it connects the chassis and cabinet to the elec trical con duct groun d. If the AC outlet in your location do es not ha ve provisions for the grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.

2. Connect the 15-pin color displa y shielded signal cabl e to your signal system device and lock both screws on the connector to ensure firm grounding. The connector information is as follow:

15 - Pin Color Display Signal Cable

PIN NO.

DESCRIPTION PIN NO.

DESCRIPTION

1 Red Video 9 Mandatory +5V Suppl y for PC Bypass 2 Green Video 10 Sync. Ground

4 GROUND 12 Bi-directional Data (SDA) for PC Bypass

6 Red Video Ground 14 Vertical Sync.

8 Blue Video Ground

3. S-Video (Y /C): TV rear side : 4 pin Mini-DIN female SCART: TV rear side : RCA female TV: TV rear side : IEC type female AV1: TV rear side : RCA female (Yellow) Audio: TV rear side : RCA female (Red / White) PC Input audio: 3.5mm Stereo female Audio Input for AV1, S-Video, SCART Video : RCA female (Red / White) Headphone 3.5mm female Audio line Out (to another speaker) : RCA female (Red / White)

4. Apply power to the display by turning the po wer switch to the "ON" pos it ion and allow about te n sec on ds

for Panel warm-up. The Power-On indicat or lights "GR EEN " when the dis p lay is on.

5. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the

brightness and contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.

FS*

Full-Screen

Aspect Ratio

6. This TV (with PC f unc tion) has p o wer s a ving f unc tio n f oll o wing the VE SA D PM S. Be sure to connect the signal cable to the PC.

7. If your TV requires service, it must be returned with the power cord.

3-1 Factory Preset Display Modes:

Analog RGB Signal Timing

MODE ASPECT RATIO HANDLING

STANDARD RESOLUTION

720x400 @ 70Hz 1280 x 768 1024 x 768 N/A 640x480 @ 60Hz 1280 x 768 1024 x 768 N/A 640x480 @ 72Hz 1280 x 768 1024 x 768 N/A

640x480 @ 75Hz 1280 x 768 1024 x 768 N/A VESA 800x600 @ 60Hz 1280 x 768 1024 x 768 N/A VESA 800x600 @ 72Hz 1280 x 768 1024 x 768 N/A VESA 800x600 @ 75Hz 1280 x 768 1024 x 768 N/A

MAC 832x624 @ 75Hz 1280 x 768 1024 x 768 N/A

1:1

MAC 1024x768 @ 75Hz 1280 x 768 1024 x 768 1024 x 768

VESA 1024x768 @ 60Hz 1280 x 768 1024 x 768 1024 x 768

1280x720 @ 60Hz 1280 x 768 1024 x 768 N/A

4. ADJUSTMENT

4-1 ADJUSTMENT CONTROL FUNCTION

Adjustments items as below: 4-1-1 Power On / Off. 4-1-2 PC

Auto adjustment for Brightness, Contrast, Pixe l Clock Frequenc y, Focus. Picture H / V Posit ion and Color Temperature.

Recall Cool, Warn and User color adjust for Color Temperature.

4-1-3 PIP

PIP On/Off control, Position Select, Video source select, Audio main/sub Select.

4-1-4 TV

Channel Up / Down, Channel Search, Volume Bass / Treble adjusts. Blue screen / Language / System / CH swap /Manual scan / CH Del Add Reset.

4-1-5 Video

Brightness and Contrast adjust, Sharpness. Color and Tint adjust, Reset

4-1-5 Audio

Volume, Bass and Treble adjust, SRS On/Off control, Reset.

4-2 ADJUSTMENT METHOD

Press MENU key to show OSD window or exit, Up / Down key to done the function selection,

And + / - key to done the adjustment.

4-3 FRONT P ANEL CONT ROL KNOBS

Power Key: Press to turn on or off the TV. MENU Key: Press to show the OSD menu and exit OSD menu at the TV. Down / Up Key: Press to perform select function and channel.

- / + Key: Press to confirm your function selection and adjustment. Source Key: Press to select your input source.

5. TROUBLE SHOOTING CHART

5-1 PANEL CONTROL CIRCUIT

5-2 MAIN BOARD POWER VCC:

5-3 ROMOTE CONTROL BLOCK:

5-4 KEY BOARD CONTROL BLOCK

5-5 PC CONTROL BLOCK:

5-6 AUDIO CONTROL BOCK:

5-7 VIDEO CONTROL BLOCK:

Note: 1、If Replace “MAIN-BOARD” , Please re-do “DDC-content” programmed & “WHITE-Balance”.

2、If Replace “ POWER-BOARD INVERTER” only, Please re-do “ WHITE-Balance”

6. White-Balance, Luminance adjustment

PC MODE

TV MODE

Color Temp.

9300

6500

9300

0.283

0.313

0.283

0.297

0.329

0.297

350±7

450±7

Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.

Before started adjust white balance, please setting the Chroma-7120 MEM. Channel 1 to 9300 color, MEM. Channel 2 to 6500 color, and MEM. Channel 3 to 9300 color, (our 9300 parameter is x = 283 ± 15, y = 297 ± 15, Y = 350 ± 7 cd/m2 ; 6500 parameter is x = 313 ± 15, y = 329 ± 15, Y = 350± 7 cd/m

How to setting MEM. Channel you can reference to Chroma-7120 user guide or simple use “SC” key and “NEXT” key to modify x, y, Y value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance adjust

˙Press Number key 1 9  9  9 will into the factory mode, and press Menu key the OSD will show menu and a

word F at Right top of Menu.

˙In the factory mode select MORE function will into Bias and Gain adjustment.

1. ADC Adjustment: AL  Auto level adjust. RG, GG, BG  R, G, B Gain adjust.

RB, GB, BB  R, G, B Bias adjust.

2. SCALER Adjustment: CO, BR  Contrast and Brightnes s adjust. RG, GG, BG  R, G, B Gain adjust. RB, GB, BB  R, G, B Bias adjust. S9, S6, ST , SH  Save 9300, 6500, 9300 color temperature. R9, R6, RT , RH Recall 9300, 6500, 9300 color temperature. BI  Setup Burn-in mode ON / OFF. ISP Set ISP ON/OFF . PP  Set PIP ON/OFF . WH  Set Wireless Headphone ON/OFF. SR  Set SRS ON/OFF. CC  Set Close Caption ON/OFF. VC  Set V Chip ON/OFF. EX  Exit MORE function to factory mode menu.

II. Bias (Low luminance) adjustment :

1. Press “AUTO” button,

2. Set the contrast on OSD window to the value=51 , color (user )R,G,B set to “50”

3. Adjust the brightness on OSD until chroma 7120 measurement reach the value Y>390 cd/m

III. Gain adjustment :

A. Adjust 9300 color-temperature:

)

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