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LM729
User Manual
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Service Manual
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AOC LM-729 Service Manual

LM-729 Service Manual Rev: A
SERVICE MANUAL
17” LCD Monitor
LM-729
Page 1 of 61
LM-729 Service Manual Rev: A
Prepared: Shiwei
Date: Jul-30-03
Page 2 of 61
LM-729 Service Manual Rev: A
Revision History
Revision Date Page Items Modification
A Date:Jul-30-03 All First version release;
Page 3 of 61
LM-729 Service Manual Rev: A
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
Page 4 of 61
LM-729 Service Manual Rev: A
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
Page 5 of 61
LM-729 Service Manual Rev: A
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
OFF Mode Maximum Screen Size
Power Source Environmental
Considerations
Weight (N. W.) Packaged 7.0Kg Unit Unpackaged 6.0Kg Unit
Operating Temp: 0°C to 40°C
<45W <2W
Horizontal : 13.3”(337.92mm) Vertical : 10.6”(270.336mm)
100~240VAC,47~63Hz
Storage Temp.: -20°C to 60°C Operating Humidity : 15% to 90%
Page 6 of 61
LM-729 Service Manual Rev: A
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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.
Monitor Block Diagram
CCFT Drive.
Flat Panel and CCFL backlight
Power board
include:adapter,inverter)
Keyboard
Main Board
RS232 Connector For white balance adjustment in factory mode
AC-IN 100V-240V
HOST Computer
Video signal, DDC
Page 7 of 61
LM-729 Service Manual Rev: A
3. OPERATING INSTRUCTIONS
3.1 GENERAL INSTRUCTIONS
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.
CONTROL Buttons
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
Page 8 of 61
LM-729 Service Manual Rev: A
OSD Table:
Main
Menu Item
Luminance
Setup
Position
Color
Main
Menu Icon
Sub Menu
Item
Contrast
Brightness
Focus
Clock
H. Position
V. Position
Warm N/A Recall Warm Color
Sub
Menu
Icon
Description
Contrast from Digital-register. 0-100 Recall Cool
Backlight Adjustment 0-100 Recall Cool
Adjust Picture Phase to reduce Horizontal-Line noise Adjust picture Clock to reduce Vertical-Line noise. Adjust the horizontal position of the picture. Adjust the verticalposition of the picture.
Adjust
Range
0-100 Do Auto Config Image
0-100 Do Auto Config
0-100 Do Auto Config Image
0-100 Do Auto Config
N/A
Reset Value
Contrast Value
Brightness Value
The Color
Temp.
Config
(Analog-On
ly Model)
(Dual-Input
Model)
Cool N/A Recall Cool Color
User / Red
User / Green
User / Blue
Yes
No N/A Do not execute Auto Config,
Analog
Digital N/A Select input signal from digital
N/A Auto Adjust the H/V Position,
N/A Select input signal from analog
Temperature from EEPROM.
Temperature from EEPROM. Red Gain from Digital-register. Green Gain Digital-register. 0-100
Blue Gain from Digital-register.
Focus and Clock of picture.
return to main menu.
(D-Sub)
N/A
0-100
0-100
N/A N/A Auto
N/A N/A
N/A N/A Input Select
N/A N/A
Temperature will be set to Cool.
The User R/G/B value(default is
100) will not be Modified by Reset function.
OSD Setup
H. Position
V. Position
OSD Timeout
(DVI) Adjust the horizontal position of the OSD. Adjust the verticalposition of the OSD. Adjust the OSD timeout. 10-120 10
Page 9 of 61
0-100 50
0-100 50
LM-729 Service Manual Rev: A
Language
English N/A Set OSD display language to
N/A
The Language will
Information
Deutsch N/A Set OSD display language to
Français N/A Set OSD display language to
Español N/A Set OSD display language to
Italiano N/A Set OSD display language to
简体中文
Information N/A Show the resolution, H/V
Yes N/A Clear each old status of
N/A Set OSD display language to
English.
German.
French.
Spain.
Italian.
Simplified Chinese.
frequency and input port of current iput timing.
Auto-configuration and set the
be set to English.
N/A
N/A
N/A
N/A
N/A
N/A N/A
N/A N/A Reset
Exit
color temperature to Cool.
No N/A Do not execute reset, return to
main menu.
N/A N/A Exit OSD N/A N/A
N/A N/A
Page 10 of 61
LM-729 Service Manual Rev: A
4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 Analog D-SUB Connector
PIN NO.
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
DESCRIPTION
DESCRIPTION
PI N NO.
VGA connector layout
15 6
11 15
10
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
TMDS Data2-
1 2 TMDS Data2+ 10
TMDS Data 2/4
3
TMDS Data1-
9
TMDS Data1+
17 18
11 TMDS Data 1/3 Shield 19
TMDS Data0-
TMDS Data0+
TMDS Data 0/5 Shield
Shield
not connected
4
5 not connected 13
12 not connected 20 not connected
not connected
21 not connected
6 DDC Clock 14 +5V Power 22 TMDS Clock Shield
7 DDC Data 15 Ground 23 TMDS Clock-
Analogue Vertical
8
Hot Plug Detect
16
24 TMDS Clock+
Sync
Page 11 of 61
LM-729 Service Manual Rev: A
1 9
17
4.2 Factory Preset Display Modes
VESA MODES
Horizontal Vertical
Mode Resolution Total
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
VGA
640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500 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
SVGA
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000 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
XGA
1024x768@72Hz 1304x798 57.515 P 72.074 P 75.000 1024x768@75Hz 1328x804 60.200 N 74.90 N 80.000
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
Nominal
Frequency
+/- 0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal Pixel
Clock
(MHz)
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
Nominal
Mode Resolution Total
Nominal
Sync
Frequency
Polarity
+/- 0.5kHz
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
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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LM-729 Service Manual Rev: A
p
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 Less than 1.0 Amps RMS Input voltage 220 VAC RMS ; 50 Hertz. Parameter 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 Less than 50 A peak Input voltage 240 VAC RMS ; 50 Hertz at all Input Fusing Fuse should be located internal to the
adapter, easily accessible when the
cover is removed 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)
Prima1ry to Safety Ground 1.5KVAC for 1 Minute(leakage current 10mA)
must be reached within 3 seconds of turn-on. must be reached within 3 seconds of turn-on.
Phase(0, 90, 180, 270 degree) Phase(0, 90, 180, 270 degree)
Fuse must be UL/CSA approved. Fuse value must no have to change for 115 VAC or 230 VAC operation
1.8KVAC for 1 Minute(leakage current 10mA)
3.0KVAC for 1 Minute(leakage current 10mA) without Y-cap & Coupling cap.
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 Ripple & noise 170mVpp at 12VDC Input voltage : 100VAC at 60Hz 240VAC at 50Hz
Output current
rotection 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
Any frequency up to 250Hz(duty 50%)
less than 7.0A, more than 12.0A at 12.0VDC
±5% for 10% to 100%, 100% to 10% load change for +12Vdc
* Ripple and noise are measured. Current exceeds maximum rateing more than 20%
Page 13 of 61
LM-729 Service Manual Rev: A
4.4 PANEL SPECIFICATION
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)
Response Time
Luminance of White (Center of screen)
Chromaticity
Coordinates (CIE)
Brightness Uniformity [%] 75 80 -
Rising Falling Tf - 12 20
Color
(CIE 1931)
C/R 250 450 -
Tr
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 Wy
Normal
ψ=0 θ=0
Viewing
Angle
- 4 5
Typ.
-0.03
0.33
TYP.
+0.03
msec
Page 14 of 61
LM-729 Service Manual Rev: A
4.4.4 Parameter guide line for CCFL Inverter
INVERTERMAXBRINGTHNESS(Vadj:5.0v),LOAD=120KΩX4(ROOMTEMPERATURE25℃±4℃)
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
Inputvoltage Vin  10.8 12 13.2 V
Inputcurrent Iin2250 2500 mA FOR4LOAD
OutputCurrent Iout 6.0 6.5 7.0 mA FOR1LOAD
Frequency
F 50.0 55.0 60.0 KHZ
FOR1LOAD
H.Vopen Vopen 1450 1600 1750 Vrms NOLOAD
H.VLoad Vload 710 810 910 Vrms
Startvoltage Vst
Protectdelaytime PDT
INVERTERMINBRINGTHNESS(Vadj:0.0v),LOAD=120KΩX4(ROOMTEMPERATURE25℃±4℃)
1650 1750 1850 Vrms RL=CCFL
0.4 1 4 Sec
RL=120KΩ
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
inputvoltage Vin  10.8 12 13.2 V
inputcurrent Iin660 750 mA FOR4LOAD
OutputCurrent Iout 3.0 3.5 4.0 mA FOR1LOAD
Frequency
F 50.0 55.0 60.0 KHZ
FOR1LOAD
H.Vopen Vopen 1450 1600 1750 Vrms NOLOAD
Startvoltage Vst
H.VLoad Vload 350 450 550 Vrms
1650 1750 1850 Vrms RL=CCFL
RL=120KΩ
Page 15 of 61
LM-729 Service Manual Rev: A
5. Block Diagram
5.1 Monitor Exploded View
Page 16 of 61
LM-729 Service Manual Rev: A
2
10
12
643
8
9
141113
1
16
1719
18
5.2 Software Flow Chart
1
Y
N
N
5
N
Y
7
N
Y
N
Y
N
Y
Y
N
5
Y
N
Y
Page 17 of 61
LM-729 Service Manual Rev: A
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 the AUTO 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 ?
1 1 ) 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 ?
Page 18 of 61
LM-729 Service Manual Rev: A
5.3 Electrical Block Diagram
5.3.1 Main Board
LCD
Interface
(CN4/CN5)
Flash Memory
W39f010P-70B
(U6)
OSD
Control
Interface
(CN9)
EPR_SDA EPR_SCL
EEPROM
24C16
(U7)
RXD TXD
Connector
DB15_SDA, DB15_SCL
EEPROM
Scalar gm5126/gm2126
(Include MCU,ADC,OSD)
(U4)
RGB
Hsync, Vsync
D-Sub
(CN2)
24C02
(U2)
DVI-I only Connector (CN1)
EEPROM (D-I only)
24C02 (U1)
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