AOC LE22H138, LE24H138 Schematic

21.5″ & 24″ LCD TV AOC LE22/24H138

Service

31~68 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….....………………….…..…….......7

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 ……………………….…….…….....28

6. PCB Layout ………………..…………………....….......35

6.1 Main Board……………..……………...…….…….......35

6.2 Power Board……...…………..…….…….……….......37

6.3 Led Board…………………………..……..……….......43

SAFETY NOTICE

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

6.4 Key Board………………………..……..……….......43

6.5 IR Board………………………….……..……….......43

7. Adjustment..............................................................44

7.1 ADC Adjustment……………………..……...………44

7.2 FW Upgrade.………………………………...………45

7.3 The Writing VGA & HDMI EDID….………...………52

8. Block Diagram.…….................................................57

9. Schematic Diagram…..…………....………………...59

9.1 Main Board…………………………………...….......59

9.2 Power Board…………..….….……...………….......68

9.3 Led Board………………………..……..……….......70

9.4 Key Board……………….……….…………….........71

9.5 IR Board……...………….……….…………….........72

10. Exploded View………………………………….…...73

11. BOM List……………….………………….………….77

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

E2AB4ANSAEE6NN

LE22H138

A00 Mar.1,2011 Initial release

LE24H138 E24BAANSAEE6NN

LE22H138 E2AB4ANSAEE8NN

A01 May.13,2011 Add new model

LE24H138 E24BAANSAEE8NN

E22B4ANSAEB13N

1. General Specification

Model LE22H138 LE24H138 Panel Size 546mm(21.5”) 609.7mm(24.0”) Resolution 1920 x 1080 1920 x 1080

TV System

Channel coverage

Speaker 3W x 2 3W x 2 Antenna impedance 75Ω 75Ω Power source 100-240V ~ 50/60Hz, 2.0A 100-240V ~ 50/60Hz, 2.0A Standby power consumption <1W <1W

Video/Audio Terminals

Video/Audio Input

Video/Audio Output

Component Input

HDMI Terminals

VGA Terminals

Headphone

SPDIF Output Coaxial Digital Audio Out jack Coaxial Digital Audio Out jack Size (W x H x D) (with base and stand)(mm) Size (W x H x D) (without base and stand)(mm)

Weight

Wall mount size

Wall-Mount accessory

Operating conditions

Storage condition

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.

Temperature 0 ~℃ +40℃ 0~℃ +40℃ Humidity 10%~85% 10%~85% Altitude To 3,000m To 3,000m Temperature -10 ~℃ +50℃ -10 ~℃ +50℃ Humidity 5%~85% 5%~85% Altitude To 10,000m To 10,000m

NTSC standard NTSC standard PAL-M & PAL-N PAL-M & PAL-N Air: 2 through 69 Cable TV: 1 through 125

Side AV x1: Video/Audio Side AV x1: Video/Audio Input/Audio output. Input/Audio output. VIDEO: 1 V(p-p), 75 ohm, negative VIDEO: 1 V(p-p), 75 ohm, negative sync. sync. AUDIO: 500mv (rms) AUDIO: 500mv (rms) VIDEO: 1 V(p-p), 75 ohm, negative VIDEO: 1 V(p-p), 75 ohm, negative sync. sync. AUDIO: 500mv (rms) AUDIO: 500mv (rms) Rear Component x1: Rear Component x1: Y: 1V(p-p), 75 ohm, including sync. Y: 1V(p-p), 75 ohm, including sync. Pr/Cr: ±0.35V(p-p), 75 ohm Pr/Cr: ±0.35V(p-p), 75 ohm Pb/Cb: ±0.35V(p-p), 75 ohm Pb/Cb: ±0.35V(p-p), 75 ohm AUDIO: 500mv (rms) AUDIO: 500mv (rms) HDMI INPUT: Rear HDMI x1; HDMI INPUT: Rear HDMI x1; HDCP compliant HDCP compliant E-EDID compliant E-EDID compliant VGA INPUT: VGA INPUT: Rear VGA (D-SUB 15 Pin) Input x1 Rear VGA (D-SUB 15 Pin) Input x1 E-EDID compliant E-EDID compliant Audio Input: Mini-jack for stereo Audio Input: Mini-jack for stereo (3.5ø) (3.5ø) Audio Output: Mini-jack for stereo Audio Output: Mini-jack for stereo (3.5ø) (3.5ø)

525x 351x 101.8 584.36x 378.79x 125.69

525x 341.13x 35 584.36x 371.62x 37.7

4.31Kg (with stand) / 5.53kg(with stand) /

3.31Kg(w/o stand and base) 4.22Kg(w/o stand and base) 100 x 100 mm (Wall mount kit is 75 x 75 mm (Wall mount kit is not included) not included) Optional accessory and not Optional accessory and not included in standard package included in standard package

Air: 2 through 69Cable TV: 1 through 125

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.

** Second audio program (Sap) Another or additional audio channel provided for in the Multichannel Television Sound (MTS) broadcast standard. A monaural sound track included within the recorded or video signal (usually containing a second language translation for the displayed program).

*** Sleep You can set a time period for which the TV will be turned off automatically.

2.2 To Use the Menus

8 9

10 11 12 13 14 15 16

2.3 How to Connect

2.4 Front Panel Control Knobs

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 Reserved (N.C. on device)

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

After connecting the PC to the TV, set the output signal from the PC according to the chart below for 21.5” 24” TV.

Standard Resolution Horizontal(KHz) Frequency(Hz)

VESA 640 x 480 31.469 59.94

VESA 800 x 600 35.156 56.250

VESA 800 x 600 37.879 60.317

VESA 1024 x 768 48.363 60.004

VESA 1360 x 768 47.72 59.799

WXGA+ 1440 x 900 55.935 59.887

WSXGA 1680 x 1050 64.674 59.884

FHD 1920 x 1080 67.5 60

Video Input Signal Reference Chart

After connecting the video input to the TV, set the output signal from the video input according to the chart below for

21.5” 24” TV.

Standard Resolution Horizontal(KHz) Vertical(Hz)

SD 480i 15.734 60

SD 480P 31.5 60

HD 720P 45 60

HD 1080i 33.75 60

FHD 1080p 67.5 60

4. Mechanical Instructions

LE22H138

1. Up to separate TV and BASE.

2. Remove the screws to remove REAR COVER and COVER _IO.

3. Remove the screws to remove AC COVER.

4. Remove the screws to remove BRACKET _AC, MAIN BOARD and POWER BOARD.

5. Remove the screws to remove SPEAKERS.

6. Remove the screws to remove LED BOARD, KEY BOARD, IR BOARD and BKT-SPEAKER and separate PANEL and bezel.

LE24H138

1. Up to separate TV and STAND.

2. Remove the screws to remove REAR COVER and COVER IO.

3. Remove the screws to remove AC COVER.

4. Remove the screws to remove MAIN BOARD and POWER BOARD.

5. Remove the screws to remove SPEAKERS and LED BOARD.

6. Remove the screws to remove KEY BOARD, IR BOARD and separate PANEL and MAIN_FRAME.

5. Repair Flow Chart

1. No power

No power (LED “Off”)

Check the AC input and the

ower is “ON”?

Yes

Power board

out

ut=5.2V?

Yes

Check the IR board and LED

Replace the IR board

Replace the main board

Power “On”

Replace the power board

2. Can’t start

Can’t start（LED red）

Power board output＝16V?

Yes

Check the power key is under control?

Check the IR receiver is normal?

Replace the power board

Yes

Replace the key board

Yes

Replace the IR board

Replace the main board

Replace the Power board

3. Abnormal display

Abnormal Display

Check the source

Yes

Enter factory mode to do

“EEPROM initial”&“Reset”

Reset the source

Check the main board

Yes

Check the LVDS cable

Yes

Check the panel

Replace the panel

Replace the main board

Replace the LVDS cable

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