AOC 831S User manual

ServiceManual AOC831S
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LCD 显示器维修手册
Custom：AOC
Model：831S

ServiceManual AOC831S
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REVISION LIST
Version Release Date Revision History Model TPV Model No
A00 Jun-18-2010 Initial Release 831S
T8RSM5NQW5A1NNJ
T8RSM5NMW5A1NNJ
T8RSM5NCW5A2NNJ
T8RSM5NBW5A2NNJ
T8RMM5NCW5A2NNJ
T8RKM5NQW5A2NNJ
T8RKM5NMW5A4NNJ
T8RKM5NCW5A1NNJ
T8RKM5NBW5A2NNJ
T8RCM5NCW5A5NNJ
T8RCM5NCW5A13NJ
T8RCM5NBW5K2NNJ
T8RAM5NCW5A1NNJ

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CONTENTS
1. LCD Specifications ------------------------------------------------------------------------------------------------------------4
1.1 Product Features ----------------------------------------------------------------------------------------------------------- 4
1.2 Factory Preset Timing ----------------------------------------------------------------------------------------------------- 5
2. Operation Instruction ---------------------------------------------------------------------------------------------------------6
2.1 Control Button-------------------------------------------------------------------------------------------------------------- 6
2.2 OSD Menu Adjusting ----------------------------------------------------------------------------------------------------- 7
2.3 OSD Lock Function------------------------------------------------------------------------------------------------------- 7
3. Interface description ----------------------------------------- ----------------------------------------------------------------8
3.1 VGA interface -------------------------------------------------------------------------------------------------------------- 8
4. Panel Feature ----------------------------------------- ------------------------------------------------------------------------ 9
4.1 General Specifications --------------------------------------------------------------------------------------------------- 9
4.2 Electrical Absolute Ratings --------- ----------------------------------------------------------------------------------- 9
4.3 Electrical Characteristics ------------------------------------------------------------------------------------------------ 10
4.4 Optical Characteristics --------------------------------------------------------------------------------------------------- 11
4.5TFT LCD Module Block Diagram-------------------------------------------------------------------------------------- 11
4.6 LCD module input terminal pin assignment ------------------------------------------------------------------------ 12
5. Block diagram -----------------------------------------------------------------------------------------------------------------13
5.1 LCD Block diagram ------------------------------------------------------------------------------------------------------- 13
5.2 Main board Block diagram ---------------------------------------------------------------------------------------------- 13
5.3 Power board Block diagram -------------------------------------------------------------------------------------------- 14
5.4 LCD software flow chart ------------------------------------------------------------------------------------------------- 15
6. Circuit Schematic ------------------------------------------------------------------------------------------------------------16
6.1 Main board ---------------------------------------------------------------------------------------------------------------- 16
6.2 Power board ---------------------------------------------------------------------------------------------------------------- 20
6.3 Invweter part---------------------------------------------------------------------------------------------------------------- 21
6.4 Key board ------------------------------------------------------------------------------------------------------------------- 22
7. Monitor exploded view ----------------------------------------------------------------------------------------------------- 23
8. PCB Layout---------------------------------------------------------------------------------------------------------------------26
8.1 Main board ------------------------------------------------------------------------------------------------------------------ 26
8.2 Power board ---------------------------------------------------------------------------------------------------------------- 27
8.3 Key board ------------------------------------------------------------------------------------------------------------------- 28
9. Maintainability --------------------------------------------------------------------------------------------------------------------29
9.1 Maintainability Requirement -------------------------------------------------------------------------------------------- 29
9.2 Trouble Shooting ---------------------------------------------------------------------------------------------------------- 29
9.3 Factory mode OSD ------------------------------------------------------------------------------------------------------ 33
9.4 DDC re-wirting step------------------------------------------------------------------------------------------------------- 34
10. BOM List -----------------------------------------------------------------------------------------------------------------------37
10.1 T8RCM5NBW5K2NNJ BOM ----------------------------------------------------------------------------------------- 37

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1. LCD Specifications
1.1 Product Features
Monitor Model AOC 831S
LCD Panel
Driving system TFT Color LCD
Active Display Area 470mm（18.5inch）diagpnal
409.8mm (W)×230.4mm(H)
Pixel Pitch 0.3 mm×0.3mm
Input
Video
R,G,B Analog Interface，75ohm,0.7V
Separate Sync. H/V TTL
H-Frequency 30kHz—81kHz
V-Frequency 56Hz--75Hz
Input Connector
D-Sub 15pin
Display Colors 16.7M Colors
Dot Clock 85.5MHz
Max. Resolution 1366 x 768@60Hz
Plug & Play VESA DDC2B /CI
Power Consumption
ON Mode <25W
Power Saving Mode <1W
Switch OFF <0.5W
Power Source 90~264VAC,47~63Hz, 1.5A Max supply current
Environmental
Considerations
Operating Temp: 0° to 40°C
Storage Temp.: -20° to 60°C
Operating Humidity : 8% to 80%
Dimensions(including stand) 455.2mm×357.9mm×219.7mm
Weight (N. W.): 3.63kg
Safety FCC B CCC IEC950CB etc.

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1.2 Factory preset modes
STANDARD RESOLUTION HORIZONTAL
FREQUENCY
VERTICAL
FREQUENCY
DOS-mode
640 × 400 31.469kHz 70.087Hz
720 × 400 31.469kHz 70.087Hz
Mac-mode 832 ×624 49.725kHz 74.55Hz
VGA
640×480 31.469kHz 59.94Hz
640×480 35.00kHz 66.667Hz
640×480 37.861kHz 72.80Hz
640 × 480 37.50kHz 75.00Hz
SVGA
800 × 600 35.16kHz 56.25Hz
800 × 600 37.879kHz 60.317Hz
800 × 600 48.07kHz 72.188Hz
800 × 600 46.875kHz 75Hz
XGA
1024 × 768 48.363kHz 60Hz
1024 × 768 56.476kHz 70Hz
1024 × 768 57.50kHz 72.074Hz
1024 × 768 60kHz 75Hz
1024 × 768 60.241kHz 74.927Hz
1360 × 768 47.712kHz 60.015Hz
WSXGA 1366 × 768 47.765kHz 59.85Hz

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2. Operation instruction
Generalization
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.
zThe power cord should be connected.
zConnect the video cable from the video card of PC to the monitor.
zPress the power button to turn on the monitor, the power indicator will light up.
2.1 Control Buttons
Control Description
1 ECO mode(DCR)/ -
If there is no OSD,select the ECO mode of brightness and
DCR.
OSD, it will decrease current value of bar, or it will move to
last item of menu.
2 4:3 or wide/ +
Hotkey, chang 4:3 or wide image ratio .
OSD, increase current value of bar, or move to next item of
menu
3Power Button To turn ON/OFF the moniteor, and power indicator
(Green/Blue and Amber/Orange).
4 Auto / Exit
Hotkey ,it is auto configuration.
Exit OSD
5 Menu / Enter
To activate the OSD window,
Exit current OSD and return to last level.

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2.2 OSD User mode adjustment
a) OSD Menu adjustment steps:
1.Press MENU button to display OSD main menu of as below, Press Left button or Right button may select other
main Menu.
2. Press MENU button to adjust items of each main menu.
3. Press Left button or Right button may select item you wish to enter.
4. Press MENU button to enter, and press Left button or Right button to adjust item you select.
5. Press EXIT button may back previous menu.
6. Repeat steps 2-5 to adjust an additional item, or select the EXIT button to return to previous menu.
2.3 OSD Lock Function
Press “menu” and hold,with turn on “Power”, the OSD menu is locked. Again, the OSD menu is non-locked.
For the OSD menu other function ,Please refer to “user manual” .

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3.Interface description
3.1 VGA 15pin Connector
Pin No. Description Pin No. Description
1. Red Input 9. +5VDC
2. Green Input 10. Logic GND
3. Blue Input 11. N/A
4. N/A 12. SDA- DDC-Serial Data
5. Connection detect 13. H Sync
6. Red GND 14. V Sync
7. Green GND 15. SCL- DDC-Serial Clock
8. Blue GND
VGA Connector layout
15
610
11 15

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4. Panel Feature
The Panel-CLAA185WA03 is a 18.51 inch wide TFT-LCD module with an intergral CCFL Backlght unit and a 30-pin
2ch –LVDS interface . This module supports 1366×768 WXGA+ resolution. and displays up to 16.7 millions colors.The
converter module for the Backlight Unit is not built in.
4.1 General Specifications
4.2 Electrical Absolute Ratings

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4.3 Electrical Characteristics
a) TFT LCD module
b) Backlight unit