AOC LE22H138 User manual

21.5″& 24″LCDTV AOC LE22/24H138
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Service
Service
Service
Horizontal Frequency
31~68KHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
6.4 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
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

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

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Revision List
Version Release Date Revision Instructions Customer Model TPV Model
A00 Mar.1,2011 Initial release
LE22H138
E2AB4ANSAEE6NN
E22B4ANSAEB13N
LE24H138 E24BAANSAEE6NN
A01 May.13,2011 Add new model
LE22H138 E2AB4ANSAEE8NN
LE24H138 E24BAANSAEE8NN

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1. General Specification
Model LE22H138 LE24H138
Panel Size 546mm(21.5”) 609.7mm(24.0”)
Resolution 1920 x 1080 1920 x 1080
TV System NTSC standard NTSC standard
PAL-M & PAL-N PAL-M & PAL-N
Channel coverage Air: 2 through 69 Cable TV: 1
through 125
Air: 2 through 69Cable TV: 1
through 125
Speaker 3W x 2 3W x 2
Antenna impedance 75Ω75Ω
Power source 100-240V ~ 50/60Hz, 2.0A 100-240V ~ 50/60Hz, 2.0A
Standby power consumption <1W <1W
Video/Audio Terminals Side AV x1: Video/Audio Side AV x1: Video/Audio
Input/Audio output. Input/Audio output.
Video/Audio Input
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/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)
Component Input
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 Terminals
HDMI INPUT: Rear HDMI x1; HDMI INPUT: Rear HDMI x1;
HDCP compliant HDCP compliant
E-EDID compliant E-EDID compliant
VGA Terminals
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)
Headphone Audio Output: Mini-jack for stereo Audio Output: Mini-jack for stereo
(3.5ø) (3.5ø)
SPDIF Output Coaxial Digital Audio Out jack Coaxial Digital Audio Out jack
Size (W x H x D) (with base and 525x 351x 101.8 584.36x 378.79x 125.69
stand)(mm)
Size (W x H x D) (without base 525x 341.13x 35 584.36x 371.62x 37.7
and stand)(mm)
Weight 4.31Kg (with stand) / 5.53kg(with stand) /
3.31Kg(w/o stand and base) 4.22Kg(w/o stand and base)
Wall mount size 100 x 100 mm (Wall mount kit is 75 x 75 mm (Wall mount kit is
not included) not included)
Wall-Mount accessory Optional accessory and not Optional accessory and not
included in standard package included in standard package
Operating
conditions
Temperature 0 ~℃+40℃0~℃+40℃
Humidity 10%~85% 10%~85%
Altitude To 3,000m To 3,000m
Storage
condition
Temperature -10 ~℃+50℃-10 ~℃+50℃
Humidity 5%~85% 5%~85%
Altitude To 10,000m To 10,000m
Note:
_ Designs and specifications are subject to change without notice.
_ This model may not be compatible with features and/or specifications that may be added in the future.

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2. Operating Instructions
2.1 The Use of Remote Control

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* 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.

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2.2 To Use the Menus

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2.3 How to Connect

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2.4 Front Panel Control Knobs

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