AOC LM92SV User manual

AOC LM92SV
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SERVICE MANUAL
19” LCD Monitor
LM92SV
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT
HAS BEEN MADE TO ENSURE THEACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE
ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATIONAND DISCLAIMS RELIABILITY FOR
CHANGES, ERRORS OR OMISSIONS.

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Table of Content
Revision List…………………………………………………………………………………………………………. 3
1. Monitor Description…………………………………………………………………………………………….. 4
2. LCD Monitor Description……………………………………………………………………………………….. 5
3. Operating Instructions………………………………………………………………………………………….. 6
3.1 General Instructions…………………………………………………………………………………………... 6
3.2 Control Buttons………………………………………………………………………………………………... 6
3.3 Adjusting the Picture………………………………………………………………………………………….. 7
4. Input/Output Specification……………………………………………………………………………………... 9
4.1 Input Signal Connector……………………………………………………………………………………….. 9
4.2 Factory Preset Display Modes……………………………………………………………………………….. 10
4.3 Power Supply Requirements………………………………………………………………………………… 10
4.4 Panel Specification………………………………………………………………………………………….… 11
4.4.1 General feature………………………………………………………………………………….……….. 11
4.4.1 Display Characteristics…………………………………………………………………………………... 11
4.4.2 Optical Characteristics…………………………………………………………………………………… 12
4.4.3 Parameter Guide Line For CCFLInverter……………………………………………………………… 13
5. Block Diagram………………………………………………………………………………………………….… 14
5.1 Monitor Exploded View……………………………………………………………………………………….. 14
5.2 Software Flow Chart…………………………………………………………………………………………... 15
5.3 Electrical Block Diagram……………………………………………………………………………………… 17
5.3.1 Main Board………………………………………………………………………………………………... 17
5.3.2 Inverter/Power Board………………………………………………………….…………………………. 18
6. Schematic……………………………………………………………………………………………………….… 19
6.1 Main Board…………………………………………………………………………………………………….. 19
6.2 Adapter Board…………………………………………………………………………………………………. 27
6.3 Inverter Board……………………………………………………………………………………….………… 28
7. PCB Layout………………………………………………………………………………………………………. 30
7.1 Main Board…………………………………………………………………………………………………….. 30
7.3 Adapter Board…………………………………………………………………………………………………. 31
7.2 Inverter Board…………………………………………………………………………………….………….. 32
7.4 Key Board………………………………………………………………………….………………………… 32
8. Maintainability……………………………………………………………………………………………………. 33
8.1 Equipments and Tools Requirement………………………………………………………………………… 33
8.2 Trouble Shooting…………………………………………………………………………………………….… 34
8.2.1 Main Board………………………………………………………………………………………………... 34
8.2.2 Inverter/Power Board…………………………………………………………………………………….. 37
8.2.3 Keypad Board…………………………………………………………………………………………….. 38
9. White-Balance, Luminance adjustment………………………………………………………………….… 39
10. EDID Content……………………………………………………………………………………………………. 40
11. BOM LIST………………………………………………………………………………………………………... 41

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REVISION LIST
Revision Date TPV Name Change Description
A00 Nov-16-05 T980KA3HBAA9KP Original Revision

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1. MONITOR SPECIFICATIONS
Driving system TFT Color LCD
Size 48.0cm(19.0")
Type M190EN03
Pixel pitch 0.294mm(H) x 0.294mm(V)
Viewable angle 170Û(H) 170Û(V) (CR=10)
LCD Panel
Response time (type) 8ms for AU panel
Sync. Type H/V TTL
H-Frequency 30kHz – 83kHz
Input
V-Frequency 55-75Hz
ON Mode İ50W
Power Consumption OFF Mode İ2W
Display Color 16.7M colors (RGB 8-bit data)
Dot Clock 135MHz
Contrast Ratio 800:1
White Luminance 250cd/m2
Max. Resolution 1280 x 1024
Plug & Play VESA DDC2BTM
Power Source 100~240VAC,47~63Hz
Maximum Screen Size Horizontal : 376.32mm
Vertical: 301.056mm
Environmental
Considerations
Operating Temp: 0°C to 40°C
Storage Temp: -20°C to 60°C
Operating Humidity: 15% to 90%

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

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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:
The Left/Right Button is used to control the monitor functions. Press to switch functions or adjust settings.
- 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.
LED = GREEN, BLINKING (0.5s period) —Out of Range
NO. Name Within OSD Without OSD
1 Auto/Exit Exit OSD or back to previous menu Auto configuration
2 / Ʒ1.Move the cursor to up
2.Adjust up when menu item selected Activate the Brightness menu
3 / 1.Move the cursor to down
2.Adjust down when menu item selected Activate the contrast menu
4 MENU Select Function or select Sub menu Activate OSD main menu
5 Indicator Light Green—On Red—Save R Green—On Red—Save
6 POWER Power On / Off Power On / Off
Control Buttons

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3.3 ADJUSTING THE PICTURE
Adjustment steps:
1. Press the MENU-button to activate the OSD window.
2. Press < or > to select the desired function.
3. Press the MENU-button to select the function that you want to adjust.
4. Press < or > to change the settings of the current function.
5. To exit and save, select the exit function, or leave the monitor alone for 10 seconds. If you want to adjust any
other function, repeat steps 2-4.
OSD TABLE:
Main Menu Item
Main
Menu
Icon
Sub Menu
Item
Sub
Menu
Icon
Description Reset Value
Contrast Contrast from Digital-register. Recall Cool Contrast
Value
Luminance Brightness Backlight Adjustment Recall Cool
Brightness Value
Focus
Adjust Picture Phase to reduce
Horizontal-Line noise Do Auto Config
Image Setup Clock
Adjust picture Clock to reduce
Vertical-Line noise. Do Auto Config
H. Position
A
djust the horizontal position of the
picture. Do Auto Config
Image Position V. Position
Adjust the vertical position of the
picture. Do Auto Config
Warm N/A
Recall Warm Color Temperature
from EEPROM.
Color Temp.
Cool N/A
Recall Cool Color Temperature
from EEPROM.
The Color
Temperature will be
set to Cool.

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User / Red Red Gain from Digital-register.
User / Green Green Gain Digital-register.
User / Blue Blue Gain from Digital-register.
Analog
N/A Select input signal from analog
source (D-Sub) N/A
Input Select
Digital N/A
Select input signal from digital
source (DVI) N/A
H. Position
A
djust the horizontal position of the
OSD. 50
V. Position
Adjust the vertical position of the
OSD. 50
OSD Setup
OSD Timeout Adjust the OSD timeout. 10
English N/A Set OSD display language to
English.
Deutsch N/A Set OSD display language to
German.
Français N/A Set OSD display language to
French.
Español N/A Set OSD display language to Spain.
Italiano N/A Set OSD display language to
Italian.
Language
ㅔԧЁ᭛ N/A Set OSD display language to
Simplified Chinese.
The Language will be
set to English.
Information Information N/A
Show the resolution, H/V frequency
and input port of current input
timing.
N/A
Yes N/A
Clear each old status of
Auto-configuration and set the color
temperature to Cool.
N/A
Reset
No N/A
Do not execute reset, return to main
menu. N/A
Exit N/A N/A Exit OSD N/A

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4. INPUT/OUTPUT SPECIFICATION
4.1 INPUT SIGANAL CONNECTOR
 
1 D-SUB connector
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. Red Video 9. No Pin!
2. Green Video 10. Logic Ground
3. Blue Video 11. Monitor Ground
4. Monitor Ground 12. DDC-Serial Data
5. DDC-Return 13. H-Sync
6. Red Ground 14. V-Sync
7. Green Ground 15. DDC-Serial Clock
8. Blue Ground
VGA connector layout
15
610
11 15
 
2 DVI connector
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. TMDS data 2Ё13. TMDS data 3Ѐ(NC)
2. TMDS data 2Ѐ14. Ѐ5V Power
3. TMDS data 2/4 Shield 15. GND(return for +5v,hsync,vsync)
4. TMDS data 4Ё(NC) 16. Hot Plug Detect
5. TMDS data 4Ѐ(NC) 17. TMDS data 0Ё
6. DDC Clock 18.
TMDS data 0Ѐ
7. DDC Data 19. TMDS data 0/5 Shield
8. Analog Vertical Sync 20. TMDS data 5Ё(NC)
9. TMDS data 1Ё21. TMDS data 5Ѐ(NC)
10. TMDS data 1Ѐ22. TMDS Clock Shield
11. TMDS data 1/3 Shield 23. TMDS Clock +
12. TMDS data 3Ё(NC) 24. TMDS Clock Ё
24 - Pin Color Display Signal Cable

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4.2 FACTORY PRESET DISPLAT MODES
Κ
VESA MODES
Horizontal Vertical
Mode Resolution Total Nominal Sync Nominal Sync Nominal
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@70Hz 1328x806 56.476 N 70.069 N 75.000
XGA
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
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
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
XGA 1024x768@72Hz 1304 x 798 57.515 P 72.1 P 75.000
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
1024x768@60Hz 1312x813 48.780 N 60.001 N 64.000XGA
1024x768@75Hz 1328x804 60.241 N 74.927 N 80.000
TV MODE
TV 640x480@50Hz 864 x 625 31.2 N 50 N 25.175
4.3 POWER SUPPLY REQUIREMENTS
A/C Line voltage range 100 V ~ 240 V
A/C Line frequency range 50 r3Hz, 60 r3Hz
Current 1.5A max at 100V ; 0.8A max at 240 V
Peak surge current < 55A peak at 240 VAC and cold starting
Leakage current < 3.5mA
Power line surge No advance effects (no loss of information or defect)
with a maximum of 1 half-wave missing per second
DC output Voltage 5VDC ± 5и; 12VDC± 5и
CURRENT 1.5Amp (5V) Ι2 Amp (12V)