AOC LM-729 User manual

LM-729 ServiceManual Rev:A
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17” LCD Monitor
LM-729
THESE DOCUMENTS ARE FOR 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 RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
SERVICE MANUAL

LM-729 ServiceManual Rev:A
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Prepared: Shiwei
Date: Jul-30-03

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Revision History
Revision Date Page Items Modification
A Date:Jul-30-03 All First version release;

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Table of Contents
Table of Contents ---------------------------------------------------------------------------------------------------3
1. MONITOR SPECIFICATIONS ---------------------------------------------------------------------------5
2. LCD MONITOR DESCRIPTION ---------------------------------------------------------------------------6
3. OPERATING INSTRUCTIONS ---------------------------------------------------------------------------7
3.1 GENERAL INSTRUCTIONS -------------------------------------------------------------------------7
3.2 CONTROL BUTTONS ------------------------------------------------------------------------------------7
3.3 ADJUSTING THE PICTURE--------------------------------------------------------------------------------7
4. Input/Output Specification - -------------------------------------------------------------------------------10
4.1 Input Signal Connector --------------------------------------------------------------------------------10
4.2 Factory Preset Display Modes -------------------------------------------------------------------------- 11
4.3 Power Supply Requirements ------------------------------------------------------------------------ 12
4.3.1 Input Requirements -------------------------------------------------------------------------------------12
4.3.2 Output Requirements ------------------------------ ------------------------------------------------12
4.4 PANEL SPECIFICATION -------------------------------------------------------------------------------14
4.4.1 Panel Feature ------------------------------------------------------------------------------------------14
4.4.2 Display Characteristics --------------------------------------------------------------------------------14
4.4.3 Optical Characteristics -------------------------------------------------------------------------------14
4.4.4 Parameter guide line for CCFL Inverter ------------------------------------------------------14
5. Block Diagram ------------------------------------------------------------- -----------------------------15
5.1 Monitor Exploded View ------------------------------------------------------------------------------------15
5.2 Software Flow Chart -------------------------------------------------------------------------------------16
5.3 Electrical Block Diagram ------------------------------------------------------------------------------18
5.3.1 Main Board -------------------------------------------------------------------------------------------------18

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5.3.2 Inverter/Power Board-------------------------------------------------------------------------------------19
6. Schematic -------------------------------------------------------------------------------------------------------21
6.1 Main Board -----------------------------------------------------------------------------------------------21
6.2 AUDIO Board -----------------------------------------------------------------------------------------25
6.3 Key Board ------------------------------------------------------- ---------------------------------------26
6.4 Inverter/Power Board -----------------------------------------------------------------------------------27
7. PCB Layout -------------------------------------------------------------------------------------------------29
7.1 Main Board -----------------------------------------------------------------------------------------------29
7.2 Inverter/Power Board -----------------------------------------------------------------------------------31
7.3 Keypad Board And Audio board-------------------------------------------------------------------------34
8. Maintainability --------------------------------------------------------------------------------------------------34
8.1 Equipments and Tools Requirements ----------------------------------------------------------------35
8.2 Trouble Shooting ---------------------------------------------------------------------------------------------33
8.2.1 Main Board --------------------------------------------------------------------------------------------------35
8.2.2 Power/Inverter Board -------------------------------------------------------------------------- ----------38
8.2.3 Key Pad Board ---------------------------------------------------------------------------------------------40
9. White-Balance, Luminance adjustment ----------------------------------------------------------------41
10. EDIT Content -------------------------------------------------------------------------------------------42
11. BOM List -------------------------------------- -----------------------------------------------------------------43

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1.MONITOR SPECIFICATIONS
Driving system TFT Color LCD
LCD Panel Size 43.2cm(17.0")
Pixel pitch 0.264mm( H )x 0.264mm( V )
Viewable angle 90˚(H) 90˚(V)
Response time (typ.) 25 ms
Video Analog /Digital
Input Sync. Type H/V TTL
H-Frequency 30kHz – 80kHz
V-Frequency 55-75Hz
Display Colors Over 16 million Colors
Dot Clock 135MHz
Max. Resolution 1280 x 1024
Plug & Play VESA DDC2BTM
Power Consumption ON Mode <45W
OFF Mode
<2W
Maximum Screen Size Horizontal : 13.3”(337.92mm)
Vertical : 10.6”(270.336mm)
Power Source 100~240VAC,47~63Hz
Environmental
Considerations Operating Temp: 0°C to 40°C Storage Temp.: -20°C to 60°C
Operating Humidity : 15% to 90%
Weight (N. W.) Packaged 7.0Kg Unit
Unpackaged 6.0Kg Unit

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2. LCD MONITOR DESCRIPTION
The LCD MONITOR will contain a main board, an inverter/power board, keypad board , Audio board and
external power adapter which house the flat panel control logic, brightness control logic and DDC.
The Inverter board will drive the backlight of panel and the DC-DC conversion.
The Adapter will provide the 12V DC-power to inverter/power board.
Power board
(
include:ada
p
ter
,
inverter
)
Flat Panel and
CCFL backlight
Main Board
Keyboard
RS232 Connector
For white balance
adjustment in
factory mode
HOST Computer
CCFT Drive.
AC-IN
100V-240V Video signal, DDC
Monitor Block Diagram

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3. OPERATING INSTRUCTIONS
3.1 GENERALINSTRUCTIONS
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor. By
changing these settings, the picture can be adjusted to your personal preferences.
-The power cord should be connected.
-Connect the video cable from the monitor to the video card.
-Press the power button to turn on the monitor, the power indicator will light up.
3.2 CONTROL BUTTONS
-Power Button:
When pressed, the monitor enters the off mode, and the LED turns blank. Press again to restore normal status.
-Left / Right Button:
When the OSD show on screen, Left/Right Button are used to control the monitor functions. Press to switch functions or adjust
settings. And if the OSD off, Left/Right buttons are used to control the audio volume;
-Auto Adjust Key:
The Auto Adjust Key is used to automatically set the H Position, V Position, Clock and Phase.
-Power Indicator:
Green — Power On mode.
Orange — Power Saving mode.
Blank —Power Off Mode.
A B C D E F
Auto Volume Menu LED Power
A. Menu button
B. Left button/Volume down
C. Right button/Volume up
D. Auto button/Exit
E. Indicator light
F. Power button
3.3 ADJUSTING THE PICTURE
CONTROL Buttons

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OSD Table:
Main
Menu Item Main Menu Icon Sub Menu Item Sub Menu
Icon
Description Ad
j
ust
Range Reset Value
Contrast Contrast from Digital-register. 0-100 Recall Cool
Contrast Value
Luminance
Brightness Backlight Adjustment 0-100 Recall Cool
Brightness Value
Focus Adjust Picture Phase to reduce
Horizontal-Line noise
0-100 Do Auto ConfigImage
Setup
Clock Adjust picture Clock to reduce
Vertical-Line noise.
0-100 Do Auto Config
H. Position Adjust the horizontal position
of the picture.
0-100 Do Auto ConfigImage
Position
V. Position Adjust the verticalposition of
the picture.
0-100 Do Auto Config
Warm N/A Recall Warm Color
Temperature from EEPROM.
N/A
Cool N/A Recall Cool Color
Temperature from EEPROM.
N/A
User / Red Red Gain from
Digital-register.
0-100
User / Green
Green Gain Digital-register. 0-100
Color
Temp.
User / Blue Blue Gain from
Digital-register.
0-100
The Color
Temperature will
be set to Cool.
The User R/G/B
value(default is
100) will not be
Modified by Reset
function.
Yes N/A Auto Adjust the H/V Position,
Focus and Clock of picture.
N/A N/AAuto
Config
(Analog-On
ly Model)
No N/A Do not execute Auto Config,
return to main menu.
N/A N/A
Analog N/A Select input signal from analog
(D-Sub)
N/A N/AInput Select
(Dual-Input
Model) Digital N/A Select input signal from digital
(DVI)
N/A N/A
H. Position Adjust the horizontal position
of the OSD.
0-100 50
V. Position Adjust the verticalposition of
the OSD.
0-100 50
OSD Setup
OSD Timeout
Adjust the OSD timeout. 10-120 10

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English N/A Set OSD display language to
English.
N/A
Deutsch N/A Set OSD display language to
German.
N/A
Français N/A Set OSD display language to
French.
N/A
Español N/A Set OSD display language to
Spain.
N/A
Italiano N/A Set OSD display language to
Italian.
N/A
Language
简体中文 N/A Set OSD display language to
Simplified Chinese.
N/A
The Language will
be set to English.
Information
Information N/A Show the resolution, H/V
frequency and input port of
current iput timing.
N/A N/A
Yes N/A Clear each old status of
Auto-configuration and set the
color temperature to Cool.
N/A N/AReset
No N/A Do not execute reset, return to
main menu.
N/A N/A
Exit N/A N/A Exit OSD N/A N/A

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4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 Analog D-SUB Connector
PIN NO.
DESCRIPTION PI N NO.
DESCRIPTION
1. Red 9. +5V
2. Green 10. Detect Cable
3. Blue 11. NC
4. Ground 12. DDC-Serial Data
5. Ground 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
VGA connector layout
15
610
11 15
4.1.2 DVI-D Connector
DVI-D Connector to be compliant to the latest DVI-DDWG specification version available.
Pin Meaning Pin Meaning Pin Meaning
1 TMDS Data2- 9 TMDS Data1- 17 TMDS Data0-
2 TMDS Data2+ 10 TMDS Data1+ 18 TMDS Data0+
3 TMDS Data 2/4
Shield
11 TMDS Data 1/3 Shield 19 TMDS Data 0/5 Shield
4 not connected 12 not connected 20 not connected
5 not connected 13 not connected 21 not connected
6 DDC Clock 14 +5V Power 22 TMDS Clock Shield
7 DDC Data 15 Ground 23 TMDS Clock-
8 Analogue Vertical
Sync
16 Hot Plug Detect 24 TMDS Clock+

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1
9
17
4.2 Factory Preset Display Modes
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
+/- 0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal Pixel
Clock
(MHz)
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
VGA
640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500
800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000
SVGA
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
1024x768@60Hz 1312x813 48.78 N 60.00 N 64.000
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@72Hz 1304x798 57.515 P 72.074 P 75.000
1024x768@75Hz 1328x804 60.200 N 74.90 N 80.000
XGA
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
XGA 1152x864@75Hz 1600x900 67.50 P 75.000 P 108.000
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
SXGA 1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
IBM MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
+/- 0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
DOS* 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
DOS** 640x400@70Hz 800 x 449 31.469 N 70.087 P 25.175
MAC MODES
VGA 640x480@67Hz 864x525 35.000 N 66.667 N 30.240
SVGA 832x624@75Hz 1152x667 49.725 N 74.551 N 57.2832

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4.3 Power Supply Requirements
4.3.1 Input Requirements
PARAMETER RANGE CONDITION
Input AC Voltage 100 to 240VAC RMS Universal input full range
Input Frequency 60Hz @ 100VAC to 50Hz @
240VAC
Input Current Less than 2.0 Amps RMS Input voltage 100 VAC RMS ; 60 Hertz. Parameter
must be reached within 3 seconds of turn-on.
Less than 1.0 Amps RMS Input voltage 220 VAC RMS ; 50 Hertz. Parameter
must be reached within 3 seconds of turn-on.
Input Power Less than 75 Watts
Power factor > 0.5 Input voltage 120 VAC RMS ; 60
Hertz
Inrush Current Less than 30 A peak Input voltage 100 VAC RMS ; 60 Hertz at all
Phase(0, 90, 180, 270 degree)
Less than 50 A peak Input voltage 240 VAC RMS ; 50 Hertz at all
Phase(0, 90, 180, 270 degree)
Input Fusing Fuse should
b
e located internal to the
adapter, easily accessible when the
cover is removed
Fuse must be UL/CSA approved. Fuse value must no
have to change for 115 VAC or 230 VAC operation
Leakage Current Less than 3.5 mA Input voltage 240 Volts RMS ; 50 Hertz
Hi-Pot Primary to secondary 1.5KVAC for 1 Minute(leakage current 10mA)
1.8KVAC for 1 Minute(leakage current 10mA)
3.0KVAC for 1 Minute(leakage current 10mA)
without Y-cap & Coupling cap.
Prima1ry to Safety Ground 1.5KVAC for 1 Minute(leakage current 10mA)
1.8KVAC for 1 Minute(leakage current 10mA)
4.3.2 Output Requirements
PARAMETER RANGE CONDITION
DC Out 12VDC ± 5% Min 0A Max 3.75A
Load Regulation 12.0V(12.12V) ± 5% 11.4 to 12.6VDC
Dynamic Load
Regulation
Any frequency up to 250Hz(duty
50%) ±5% for 10% to 100%, 100% to 10% load change for +12Vdc
Ripple & noise 170mVpp at 12VDC Input voltage : 100VAC at 60Hz 240VAC at 50Hz
* Ripple and noise are measured.
Output current
p
rotection
less than 7.0A, more than 12.0A
at 12.0VDC
Current exceeds maximum rateing more than 20%
Leakage Current Less than 0.25 mA Input voltage 100 Volts RMS ; 50 Hertz
Less than 0.5 mA Input voltage 240 Volts RMS ; 50 Hertz

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4.4 PANELSPECIFICATION
4.4.1 Panel Feature
-High contrast ratio, high aperture structure
-TN(Twisted Nematic) mode
-Wide viewing angle
-High speed response
-SXGA(1280 x 1024 pixels) resolution
-Low power consumption
-2 dual CCFTs(Cold Cathode Fluorescent Tube)
-DE(Data Enable) mode
-COMPACT SIZE DESIGN
4.4.2 Display Characteristics
Items Specification Unit
Display Area 337.92(H) x 270.336(V) mm
Driver element a-Si TFT active matrix
Display color 16.2M Colors
Number of pixels 1280 x 1024 pixel
Pixel Arrangement RGB vertical stripe
Pixel pitch 0.264(H) x 0.264(W) mm
Display Mode Normally White
4.4.3 Optical Characteristics
The optical characteristics are measured under stable conditions at 25℃(Room Temperature):
Item Symbol Conditions Min. Typ. Max. Unit Note
Contrast Ratio
(Center of screen) C/R 250 450 -
Rising Tr - 4 5
Response
Time Falling Tf - 12 20
msec
Luminance of White
(Center of screen) YL 200 260 - Cd/m2
Rx 0.64
Ry 0.34
Gx 0.29
Gy 0.61
Bx 0.14
By 0.07
Wx 0.31
Color
Chromaticity
(CIE 1931)
Coordinates (CIE)
Wy
Normal
ψ=0
θ=0
Viewing
Angle Typ.
-0.03
0.33
TYP.
+0.03
Brightness Uniformity [%] 75 80 -

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4.4.4 Parameter guide line for CCFL Inverter
INVERTERMAXBRINGTHNESS(Vadj:5.0v),LOAD=120KΩX4(ROOMTEMPERATURE25℃±4℃)
ITEMSYMBOLMIN.TYP.MAX.UNITREMARK
InputvoltageVin10.81213.2 V
InputcurrentIin22502500mAFOR4LOAD
OutputCurrentIout6.06.57.0mAFOR1LOAD
FrequencyF50.055.060.0KHZFOR1LOAD
H.VopenVopen145016001750VrmsNOLOAD
H.VLoadVload710810910VrmsRL=120KΩ
Startvoltage Vst165017501850VrmsRL=CCFL
Protectdelaytime PDT0.414Sec

INVERTERMINBRINGTHNESS(Vadj:0.0v),LOAD=120KΩX4(ROOMTEMPERATURE25℃±4℃)
ITEMSYMBOLMIN.TYP.MAX.UNITREMARK
inputvoltageVin10.81213.2 V
inputcurrentIin660750mAFOR4LOAD
OutputCurrentIout3.03.54.0mAFOR1LOAD
FrequencyF50.055.060.0KHZFOR1LOAD
H.VopenVopen145016001750VrmsNOLOAD
Startvoltage Vst165017501850VrmsRL=CCFL
H.VLoadVload350450550VrmsRL=120KΩ

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5. Block Diagram
5.1 Monitor Exploded View

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5.2 Software Flow Chart
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
1
5
Y
N
16
1
7
19
Y
N
18

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Remark:
1) MCU initialize.
2) Is the EEprom blank ?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed ?
6) Clear all global flags.
7) Are theAUTO and SELECT keys pressed ?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color.
Scalar initialize.
10) In standby mode ?
11) Update the life time of back light.
12) Check the analog port, are there any signals coming ?
13) Does the scalar send out a interrupt request ?
14) Wake up the scalar.
15) Are there any signals coming from analog port ?
16) Display "No connection Check Signal Cable" message. And go into standby mode after
the message disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed ?

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5.3 Electrical Block Diagram
5.3.1 Main Board
OSD
Control
Interface
(CN9)
Scalar gm5126/gm2126
(Include MCU,ADC,OSD)
(U4)
Flash Memory
W39f010P-70B
(U6)
EEPROM
24C16
(U7)
D-Sub
Connector
(CN2)
EEPROM
24C02
(U2)
Hsync,
Vsync
RGB
RXD
TXD
DB15_SDA,
DB15_SCL
EPR_SDA
EPR_SCL
LCD
Interface
(CN4/CN5)
DVI-I only
Connector
(CN1)
EEPROM (D-I only)
24C02
(U1)

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5.3.2 Inverter/Power Board
Buck Connector Parallet-resonant
Driver Dimming control
(阀菠瓜)
Parallet-resonant
inverter
CCFL
PWM
Dimming control
Driver
Circuit
Vin
Vin inverter
(PW M)
Circuit
Inverter Block Diagram