AOC L19BH83 Schematic

19″&22″LCD TV AOC L19BH83&L22BH83

1

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

6.1.Main Board……….……..……………...……….......28

6.2.Power Board…………….…..………….……….......31

6.3.Key Board……………..………………..……….......32

6.4.IR Board……………….………………..……….......32

7.White-Balance, Luminance Adjustment....................33

8.Block Diagram.…..……............................................34

9.Schematic……………...…………..………………...35

9.1 Main Board…………………………………...….......35

9.2.Power Board…………….…………...………….......46

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

10.Exploded View………………………………….…...49

11.BOM List……………….…………………………….5 1

12.Different Parts List……………………………………85

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 Menu…...…………………….……….......6

2.3. How To Connect…….…………………….……….....11

2.4. Front Panel Control Knobs……………….……….....13

3. Input/Output Specification…………....................…....14

4. Mechanical Instructions…………………….................17

5. Repair Flow Chart ……………………….…….…….....23

6. PCB Layout …………………..………………....….......28

Service

Service

Service

Horizontal Frequency

L19BH83:37kHz~67.5kHz

TABLE OF CONTENTS

Description Page Description Page

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.

SAFETY NOTICE

L22BH83: 31.5kHz~80kHz

19″&22″LCD TV AOC L19BH83&L22BH83

2

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.)

19″&22″LCD TV AOC L19BH83&L22BH83

3

Version

Release Date

Revision Instructions

Customer Model

TPV Model

A00

Nov-3-2008

Initial Release

L19BH83

E1983ANCW1A4NN

L22BH83

E228CANCW1A4NN

A01

Dec-16-2008

Add new BOM

L19BH83

E19R3ANMW1A4NN

Revision List

19″&22″LCD TV AOC L19BH83&L22BH83

4

Function

19"W/22"W Screen
PC Input
Support TV,VIDEO、HDMI Signal

ITEM

19"W

22"W

TV Function

TV Standard

PAL B/G、D/K、I、NTSC M

Sound System

NICAM、FM-MONO

Video Input

AV

RCA X 1

S-VIDEO

S-Video X 1

YPbPr/YCbCr

YPbPr X 1

HDMI

HDMI X 1

HDMI, component support Timing
480i、576i、480p、576p、720p、1080i

VGA Function

Input support definition

1440*900 /60Hz (19”W)
1680*1050 /60Hz (22”W)

Audio input

Mini jack for stereo headphones (3.5ø)

Audio output

Audio output: L / R
built-in Two speakers

Headphone Mini-jack for stereo (3.5ø))

OSD Language

chinese / English (default is English)

Table Stand

Yes

Wall Mount

VESA 100 x 100 mm

Power
Power

AC100V~240V, 50/60Hz

Power Consumption

≤65W

≤75W

Environment

Temperature

+ 5 °C ~ + 35 °C

storage

- 25 °C ~ + 60 °C

operating

10% ~ 85%

Dimension

W x H x D
(with
stand)

446x358x145(mm)

512x400x144(mm)

1. General Specification

19″&22″LCD TV AOC L19BH83&L22BH83

5

POWER

Press to power ON/OFF
(standby) TV. (Note:TV is never
completely power off unless
physically unplugged.)

VIDEO/S-VIDEO IN
Press repeatedly to toggle
between AV and S-VIDEO
source modes

COMP/HDMI

Press repeatedly to toggle
between COMPONENT and
HDMI source modes 。

pc

Press to choose PC source
mode directly.

TV

Press to choose TV source
mode directly.

0~9/100 number

Press to enter channel
numbers

CH + -:

Press to change TV channel up
or down

VOL- / VOL+

Press + or - to adjust the
volume.

NICAM

Press to activate the TV
sounds,

SLEEP

Press to set sleep timer,setting
a mount of time before your TV
turn off automatically

MENU

Press to open or exit menu.

PRE CH

Press to display the
previous channel .

MUTE

Press to mute the
sound.Press again to
restore sound.

DISPLAY

Press to show the
information about the input
source or TV channel.

SOURCE

Press to display source
menu。

SOUND

Press to switch the preset
of audio preset mode.

WIDE

Press to choose the
display aspect

FREEZE

No support for this product

PICTURE

Press to switch the preset
of video preset mode.

EXIT

Press to exit menu or OSD.

“∧”,“∨”,“ ＜”,“ ＞”,“ENT
ER”

Press to adjust the various
function items on the
menu.

2. Operating Instructions

2.1 The Use of Remote Control

19″&22″LCD TV AOC L19BH83&L22BH83

6

MAIN MENU

2.2 To Use the Menus

1. Press the MENU button to display the main menu

2. Use the cursor left/right to select a menu item.

3. Use the cursor Up/Down to enter a submenu.

4. Press the OK button to enable/disable the function.

5. Press the MENU or EXIT button to exit the menu.

Press the MENU button to enter the main OSD (On Screen Display). Adjust the items including Picture menu,
Sound menu, advanced menu, Installation menu, PC setup menu and System menu.
When the input source is TV mode, Picture menu, Sound menu, advanced menu, Installation menu and
System menu can be selected.

When the input source is AV, S-video, Component or HDMI mode, only the Picture menu, Sound menu, Advanced
menu and System menu can be selected.

When the input source is PC mode, Picture menu, Sound menu, PC setup menu and System menu can be
selected.

19″&22″LCD TV AOC L19BH83&L22BH83

7

Picture Menu

1. Preset: Designed for different types of video mode. Can select Personal, Vivid, Standard and Mild

2. Brightness: Video brightness adjustment, can adjust only when Preset is setted as Personal. The tuning range
is 0 ~ 100.

3. Contrast: Video contrast adjustment, can adjust only when Preset is setted as Personal. The tuning range is 0
~ 100.

4. Color: Video color chroma adjustment, can adjust only when Preset is setted as Personal. The tuning range is
0 ~ 100.

5. Tint: Video tint adjustment, Can only select with NTSC signal. The tuning range is -50 ~ +50.

6. Sharpness: Video sharpness adjustment, the tuning range is 0 ~ 100.

7. Color temp: There are three options of colour temperature provided for users - warm, normal and cool.

8. Reset: Restore the default video settings.

Sound Menu

The Sound menu shows as below. It provides audio adjustment for user to modify the audio setting.

1. Preset: Designed for different types of sound mode. Can select Personal, Voice, Music and Theatre.

2. Bass: Bass tone adjustment, can adjust only when Preset is setted as Personal. The tuning range is -50 ~50.

3. Treble: Treble tone adjustment, can adjust only when Preset is setted as Personal. The tuning range is -50~50.

4. Balance: Audio balance adjustment, the tuning range is -50~50.

5. Sound mode: Press to activate the TV sounds mode,

19″&22″LCD TV AOC L19BH83&L22BH83

8

PC Setup Menu

6. Reset: Restore the default audio settings.

Advanced Menu

1. Noise reduction：Designed for different noise reduces effect, user can select off, Low, Normal and High.

2.

Super contrast: Enhance the contrast of color.

3. Size: There are various functions provided for zoom in or zoom out. Can select Normal, Zoom, and Wide.

4. Reset: Restore the default video settings.

se

1. Auto adjust: Automatically adjust PC input to the optimal screen size.

2. H.Position: Adjust Horizontal position of picture from -50~50.

3. V.Position: Adjust Vertical position of picture from -50~50.

4. Clock: Adjust clock of signal. The tuning range is -50~50.

5. Phase: Adjust phase of signal. The tuning range is -50~50.

Installation Menu

19″&22″LCD TV AOC L19BH83&L22BH83

9

一.Auto search:
Select "Auto Search" to search all signaled channel; when the searching is complete, it stays at the first channel with

signal and all channels that have been located are stored. If you would like to stop "Auto Search" during the process,
simply by pressing the MENU button.

二.Manual setup:

1.Program.: Shows the current channel number.

2.Name: Shows the current channel name

3.Search: Shows the current channel frequency

4.Color system:Can set as NTSC, PAL or AUTO. Advise please do not change this item after auto search action.

5.Sound system: Can set as BG, DK ,M or I,. Advise please do not change this item after auto search action.

6.Fine tuning: Fine tune the frequency of current channel.

7.AFC: AFC can be set to ON or OFF. Set to ON, the TV will search signal automatically; when there is any offset in

the signal, will automatically adjust the channel to the correct frequency.

8.Save: to save user program seting.

三.Program editor:

Follow the instruct (lower of OSD) to edit the program.
Skip: Skip can be set to ON or OFF. When it is set to ON, a channel can be skipped by pressing the switching button on the
remote control or on the front panel.

19″&22″LCD TV AOC L19BH83&L22BH83

10

System Menu (

1. Menu language: There are two language options provided - English, Chinese,default is English.

2. Menu timeout: Adjust the time of menu display.

3. Sleep timer: Function with which you can set a time period after which the TV should turn itself off. You can set
it as 5, 10, and 15.30,45,60,90,120,180,240 and off.

4. Menu background: Adjust the background of OSD menu. The tuning range is 0 ~ 15.

5. Reset: Restore the default System settings.

6. Reset all: Reset all OSD setting to default value.

19″&22″LCD TV AOC L19BH83&L22BH83

11

2.3 How to Connect

VIDEO RECORDER

How to connect

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

2. Connect another FR cable from the port of your VCR to the antenna port of you TV 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 cable with the S-VIDEO input on the TV.
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 TV, select the TV channel auto search.

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

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

DVD PLAYER

How to connect

1. Connect 3 separate components signal cables to the Y, Pb and Pr ports of the component signal of the DVD

player, and the Y, Pb and Pr ports of the component signal of theTV set.

2. Connect the audio cable to the audio output port of the DVD player and the audio input port of the component

signal of the TV set.

How to use

1. Select YPbPr mode.

2. Turn on the DVD set.

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-Video cable between the equipment and the TV set.

How to use it

1. Select the video AV or S-Video 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.

19″&22″LCD TV AOC L19BH83&L22BH83

12

DIGITAL SET TOP BOX

Connect the top box to the input port of the component signal.

How to connect

1. Connect 3 separate component signal cables to the Y, Pb and Pr ports of the component signal of the Digital

TV/ Top Box, and the Y, Pb and Pr ports of the component signal of theTV set.

2. Connect the audio cable with the audio port of the Digital TV/Top Box and the audio port of the TV set.

How to use

1. Select Component.

2. Turn on the DVD set-Top box set.

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.

PC

How to connect the TV set to your computer

Use D-sub signal cable (also called VGA cable) enclosed in the carton to connect the D-sub interface of the TV set
and your computer, now the TV set is used as a monitor and you need to switch the source to PC mode. Please see
the below picture for your reference.

How to connect audio cable

Use the audio cable enclosed in the carton to connect the PC audio output terminal to TV set audio input terminal.
Please see the below picture for your reference.

19″&22″LCD TV AOC L19BH83&L22BH83

13

1 VOL▲

VOL +: Press to increase the volume. In Menu mode, functions as right arrow to
go to a next menu or increase a setting.

2 VOL▼

VOL - : Press to decrease the sound volume level. In Menu mode, functions as
left arrow to go to a previous menu or decrease a setting.

3 CH ▲

CH +: Press to select the next higher Program number.

4 CH ▼

CH - : Press to select the next lower Program number.

5 MENU

Menu key: Press

to open or exit the OSD menu.

6 INPUT

Source key: Press to select the input source.

7 POWER

Power key: Press to turn on / off (standby) the TV set.

2.4 Front Panel Control Knobs

19″&22″LCD TV AOC L19BH83&L22BH83

14

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 Video Ground

14

V-Sync.

7

Green Video Ground

15

Serial Clock for DDC

8

Blue Video Ground

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

1611

15

5

10

3. Input/Output Specification

3.1 RGB Signal input

15 - Pin Color Display Signal Cable

3.2 HDMI Digital connector pin assignments

19″&22″LCD TV AOC L19BH83&L22BH83

15

AV

(Composite Video)

Video system

NTSC/PAL

Amplitude

1.0Vpp (including sync)

Impedance

75 ohm terminated

S-Video

Video system

NTSC/PAL

Y signal amplitude

1.0Vpp (including sync)

C signal amplitude

0.286Vpp

Impedance

75 ohm terminated

Component Video

Video System

DTV

NTSC/PAL

480i, 480p, 576i,576p,720p, 1080i

Y signal amplitude

1.0Vpp (including sync)

Pr/ Pb signal amplitude

0.7Vpp

Impedance

75 ohm terminated

Composite Video

Video system

NTSC/PAL

Amplitude

1.0Vpp (including sync )

Impedance

75 ohm terminated

S-Video

Video system

NTSC/PAL/SECAM

Y signal amplitude

1.0Vpp (including sync )

C signal amplitude

0.286Vpp

Impedance

75 ohm terminated

Video Mode

FH

(kHz)

FV

(Hz)

Dot

clock

(MHz)

Sync

polarity

Horizontal (dot)

Vertical (line)

H V H-total

H-wid

e

H

Bac

k

porc

h

H

Front

porch

V-total

V-wid

e

H

Back

porc

h

H
Front
porch

VESA

VGA 640x480

31.46

9

59.94

0

25.17

5

N N 800

96

48

16

526 2 33

11

SVGA 800x600

37.87

9

60.31

7

40.00

0

P P 1056

128

88

40

628 4 23

1

XGA 1024x768

48.36

3

60.00

4

65.00

0

N N 1344

136

160

24

806 6 29 3 1360x768

63.98

1

60.02

0

108.0

00

P P 1688

112

248

48

1066

3

38

1

VGA TEXT

720x400

31.46

9

70.08

7

28.32

2

N P 900

108

45

27

449 2 35

12

1680X1050

64.67

4

59.88

4

119.0

00

P P 1840

32

80

48

1080

6

21

3

3.3 AV/S-Video/Component Video Inputs

L19BH83

L22BH83

3.4 Compatible Mode Table

L22BH83

19″&22″LCD TV AOC L19BH83&L22BH83

16

Video Mode

FH

(kHz)

FV

(Hz)

Dot

clock

(MHz)

Sync

polarity

Horizontal (dot)

Vertical (line)

H V H-total

H-wid

e

H

Back

porc

h

H
Front
porch

V-total

V-wid

e

H

Back

porch

H

Front

porch

VESA

VGA 640x480

31.46

9

59.94

0

25.175

N N 800

96

48

16

526 2 33

11

37.86

1

72.80

9

31.500

N N 832

40

128

24

520 3 28

9

37.50

0

75.00

0

31.500

N N 840

64

120

16

500 3 16

1

SVGA 800x600

35.15

6

56.25

0

36.000

P P 1024

72

128

24

625 2 22

1

37.87

9

60.31

7

40.000

P P 1056

128

88

40

628 4 23

1

48.07

7

72.18

8

50.000

P P 1040

120

64

56

666 6 23

37

46.87

5

75.00

0

49.500

P P 1056

80

160

16

625 3 21

1

XGA 1024x768

48.36

3

60.00

4

65.000

N N 1344

136

160

24

806 6 29

3

56.47

6

70.06

9

75.000

N N 1328

136

144

24

806 6 29

3

60.02

3

75.02

9

78.750

P P 1312

96

176

16

800 3 28

1

SXG

A

1152x86

4

67.50

0

75.00

0

108.00
0

P P 1600

128

256

64

900 3 32

1

1280x10

24

63.98
1

60.02

0

108.00
0

P P 1688

112

248

48

1066

3

38

1

79.97
6

75.02

5

135.00
0

P P 1688

144

248

16

1066

3

38

1

VGA

TEXT

720x400

31.46
9

70.08

7

28.322

N P 900

108

45

27

449 2 35

12

Macintosh

640x480

35.00
0

66.66

7

30.240

N N 864

64

96

64

525 3 39 3 832x624

49.72
5

74.50

0

57.283

N N 1152

64

224

32

667 3 39

1

1024x768

60.15
0

74.72

0

80.000

N N 1330

96

168

42

805 3 31

3

1280x768

47.77
6

59.87

0

79.500

N P 1664

128

192

64

798 7 20 3

1280x960

60.00
0

60.00

0

108.00
0

P P 1800

112

312

96

1000

3

36 1

1440x900

55.93
5

59.88

7

106.5

N P 1904

152

232

80

934 6 25

3

L19BH83

19″&22″LCD TV AOC L19BH83&L22BH83

17

4. Mechanical Instructions

L19BH83

1. Remove the 3 screws to remove the stand base.

2. Remove 7 screws to remove the rear cover.

3. Release the connectors.

19″&22″LCD TV AOC L19BH83&L22BH83

18

4. Remove the screws to remove key board

5. Remove the speakers

6. Remove Power board and Main board.

19″&22″LCD TV AOC L19BH83&L22BH83

19

7.Remove the IR board

8. Remove the 4 screws to remove the main frame.

9. The panel.

19″&22″LCD TV AOC L19BH83&L22BH83

L22BH83

1. Remove the 3 screws to remove the stand base.

2. Remove 5 screws to remove the rear cover.

3. Release the connectors.

20

19″&22″LCD TV AOC L19BH83&L22BH83

4. Remove the screws to remove key board

5. Remove the speakers

6. Remove Power board and Main board.

21

19″&22″LCD TV AOC L19BH83&L22BH83

7. Remove the IR board

8. Remove the 4 screws to remove the main frame.

9. The panel.

22

19″&22″LCD TV AOC L19BH83&L22BH83

NG

Repair key board or remote control

OK

Check U701, U702, U703

NG

Replace U701, U702, U703

Check U400

NG

Replace U400

OK

OK

Check key board or remote control

Check I2C communication

Can not start

OK

NG

Check power cord and board interface

Plug in power cord and interface

OK

Check F901, BD901, C905

NG

Replace F901 or BD901 or C905

OK

Check IC901, Q901

Check D904, D906

NG

Replace IC901 or Q901

OK

Check T901

OK

Replace T901

Replace D904 or D906

OK

NG

NG

Check ZD920

NG

Replace ZD920

5. Repair Flow Chart

1. No Power (No LED indicator)

2. Can not start (LED indicator yellow)

23

19″&22″LCD TV AOC L19BH83&L22BH83

Check 12V

power supply

Check Panel

NG

Replace Panel

Check back light is OK

OK

Check LVDS cable

and connector

OK

Check UH200

NG

Replace

UH200

OK

Check U202

NG

Replace U202

NG

NG

OK

Check BL-ON/OFF signal

Check PS

signal

OK

OK

Check power

board

NG

NG

NG

Check Q705、Q706

Replace Q705、Q706

3. No display (LED indicator green)

24

19″&22″LCD TV AOC L19BH83&L22BH83

Check the source

OK

Reset source

NG

Check signal filter circuit

NG

Replace the filter or inductance

OK

NG

TV signal

Check TV system setup

OK

Check TU101

Replace TU101

OK

Check U400

NG

Replace U400

OK

Check LVDS cable

NG

Replace LVDS cable

OK

Check panel

NG

Replace panel

Check input signal

AV, S-video, Comp，PC，HDMI signal

4. Abnormal display

25

19″&22″LCD TV AOC L19BH83&L22BH83

Check the source

OK

Reset source

Check signal filter circuit

NG

Replace the filter or inductance

OK

NG

SIF signal

Check TV system setup

OK

Check TU101

Replace TU101

Check U602, U603

NG

Replace U602 or U603

Check Earphone jack

NG

Replace the Earphone jack

OK

Check speaker

NG

Replace speaker

Check U600

Replace U600

NG

Check input signal

OK

OK

5. No sound

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