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196v
Schematic
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AOC 196v Schematic

AOC 196V
SERVICE MANUAL
19” LCD Monitor
196V
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT
ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR
CHANGES, ERRORS OR OMISSIONS.
1
AOC 196V
Table of Content
Revision List…………………………………………………………………………………………………………. 3
1. Monitor Specifications………………………………………………………………………………………….. 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………………………………………………………………………………… 11
4.4 Panel Specification………………………………………………………………………………………….… 11
4.4.1 Panel Feature…………………………………………………………………………………………….. 11
4.4.2 Display Characteristics………………………………………………………………………………….. 11
4.4.3 Optical Characteristics…………………………………………………………………………………… 12
4.4.4 Parameter Guide Line For CCFL Inverter……………………………………………………………… 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 Power Board……………………………………………………………………….………………………….. 25
6.3 Audio Board……………………………………………………………………….…………………………..
7. PCB Layout……………………………………………………………………………………………………….
7.1 Main Board…………………………………………………………………………………………………….. 30
7.2 Power Board………………………………………………………………………….……………………….. 31
7.3 Audio Board…………………………………………………………….……………………………………… 31
7.4 Key Board……………………………………………………………………………………………………… 31
8. Maintainability……………………………………………………………………………………………………. 32
8.1 Equipments and Tools Requirement………………………………………………………………………… 32
28
30
8.2 Trouble Shooting…………………………………………………………………………………………….… 33
8.2.1 Main Board………………………………………………………………………………………………... 33
8.2.2 Power /Inverter Board……………………………………………………………………………………. 36
8.2.3 Keypad Board…………………………………………………………………………………………….. 38
9. White-Balance, Luminance adjustment…………………………………………………………….……….. 39
10. EDID Content……………………………………………………………………………………………………. 40
11. BOM LIST………………………………………………………………………………………………………... 41
2
AOC 196V
Revision List
Revision Date TPV Name Change Description
A00 Nov-08-05 T980KH2HD4A1A Original Revision
3
AOC 196V
1.MONITOR SPECIFICATIONS
Driving system TFT Color LCD
Size 48.0cm(19.0")
LCD Panel
Input
Display Color
Dot Clock 135MHz
Contrast Ratio 600:1
White Luminance 250cd/m
Max. Resolution 1280 x 1024
Plug & Play VESA DDC2BTM
Pixel pitch 0.294mm( H )x 0.294mm( V )
Viewable angle 140˚ (H) 130˚ (V) (CR>10)
Response time (type) 8 ms for HSD panel
Sync. Type H/V TTL
H-Frequency 30kHz – 83kHz
V-Frequency 55-75Hz
16.1M (6-bits+FRC)
2
Power Consumption
Power Source 100~240VAC,47~63Hz
Maximum Screen Size
Environmental
Considerations
ON Mode<55W
OFF Mode<3W
Horizontal : 376.32mm
Vertical: 301.056mm
Operating Temp: 0°C to 40°C
Storage Temp: -20°C to 60°C
Operating Humidity: 15% to 90%
4
AOC 196V
(
2. LCD MONITOR DESCRIPTION
The LCD MONITOR will contain a main board, a power board, a keypad board and an audio board which house the
flat panel control logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Monitor Block Diagram
CCFL Drive.
Flat Panel and
CCFL backlight
PWPC board
Include: adapter, inverter)
AC-IN
100V-240V
Audio board
Main Board
Keyboard
Video signal,
HOST Computer
RS232 Connector
For white balance
adjustment in factory
mode
5
AOC 196V
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: Blue — Power On mode. Orange — Power Saving mode. Blank —Power Off Mode.
LED = GREEN, BLINKING (0.5s period) —Out of Range
NO. Name
1 MENU Select Function or select Sub menu Activate OSD main menu
2 VOL+ / Adjust up when menu item selected
3 POWER Power On / Off
Within OSD
Increase
Without OSD
the value of volume
Power On / Off
4 VOL-/ Adjust down when menu item selected
5 Auto/EXIT Exit OSD or back to previous menu Auto configuration
6
Decrease
the value of the volume
AOC 196V
A
A
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
Luminance
Image Setup
Image
Position
Color Temp.
Main Menu
Icon
Sub Menu Item
Contrast
Brightness
Focus
Clock
H. Position
V. Position
Warm N/A
Sub Menu Icon
Description
Contrast from Digital-register.
Backlight Adjustment
Adjust Picture Phase to reduce
Horizontal-Line noise
djust picture Clock to reduce
Vertical-Line noise.
djust the horizontal position of the
picture.
Adjust the vertical position of the
picture.
Recall Warm Color Temperature
from EEPROM.
Cool N/A
sRGB N/A
User / Red
User / Green
7
Recall Cool Color Temperature from
EEPROM.
Recall sRGB Color Temperature
from EEPROM.
Red Gain from Digital-register.
Green Gain Digital-register.
AOC 196V
A
Auto Config
(Analog-Only
Model)
OSD Setup
Language
User / Blue
Yes
No N/A
H. Position
N/A
V. Position
OSD Timeout
English N/A
Deutsch N/A
Français N/A
Blue Gain from Digital-register.
Auto Adjust the H/V Position, Focus
and Clock of picture.
Do not execute Auto Config, return
to main menu.
djust the horizontal position of the
OSD.
Adjust the vertical position of the
OSD.
Adjust the OSD timeout.
Set OSD display language to
English.
Set OSD display language to
German.
Set OSD display language to
French.
Information
Reset
Exit
Español N/A Set OSD display language to Spain.
Italiano N/A Set OSD display language to Italian.
简体中文
Information N/A
Yes N/A
No N/A
N/A N/A Exit OSD
N/A
Set OSD display language to
Simplified Chinese.
Show the resolution, H/V frequency
and input port of current input
timing.
Clear each old status of
Auto-configuration and set the color
temperature to Cool.
Do not execute reset, return to main
menu.
8
AOC 196V
4. Input/Output Specification
4.1 Input Signal 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
2 DVI connector
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1.
2.
3. TMDS data 2/4 Shield 15. GND (return for +5v,hsync, vsync)
4.
5.
6. DDC Clock 18.
7. DDC Data 19. TMDS data 0/5 Shield
8. Analog Vertical Sync 20.
9.
10.
TMDS data 2－
TMDS data 2＋
TMDS data 4－（ＮＣ）
TMDS data 4＋（ＮＣ）
TMDS data 1－
TMDS data 1＋
15
6
11 15
10
13.
14.
TMDS data 3＋（ＮＣ）
＋5V Power
16. Hot Plug Detect
17.
TMDS data 0－
TMDS data 0＋
TMDS data 5－（ＮＣ）
21.
TMDS data 5＋（ＮＣ）
22. TMDS Clock Shield
11. TMDS data 1/3 Shield 23. TMDS Clock +
12.
TMDS data 3－（ＮＣ）
24.
TMDS Clock －
24 - Pin Color Display Signal Cable
9
AOC 196V
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
SVGA
XGA
SXGA
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
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@70Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
Nominal
Frequency
+/- 0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
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
XGA
1024x768@60Hz 1312x813 48.780 N 60.001 N 64.000
1024x768@75Hz 1328x804 60.241 N 74.927 N 80.000
10
AOC 196V
4.3 Power Supply Requirements
A/C Line voltage range 100 V ~ 240 V
A/C Line frequency range
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
DC output Voltage
CURRENT
50 ± 3Hz, 60 ± 3Hz
No advance effects (no loss of information or defect)
with a maximum of 1 half-wave missing per second
5VDC ± 5％; 12VDC± 5％
1.5Amp (5V) ；2 Amp (12V)
4.4 PANEL SPECIFICATION
4.4.1 Panel Feature
■ 19”SXGA TFT LCD panel
■ 4 CCFLs Backlight system
■ Supported SXGA (V:1024 lines, H:1280 pixels) resolution
■ Supported to 75Hz refresh rate
■ LCD Timing Controller
■ Compatible with RoHS standard
4.4.2 Display Characteristics
11
AOC 196V
4.4.3 Optical Characteristics
12
AOC 196V
4.4.4 Parameter guide line for CCFL Inverter
1.TFT LCD Module:
2.Back Light Unit:
13
AOC 196V
5. Block Diagram
5.1 Monitor Exploded View
1 FUNCTION 33G6288-Y-L 8 HINGE 37G 510-2
2 LENS 33G6289-1 9 HINGE BRACKET 15G6206-1
3 BEZEL 34G6201-Y-1B 10 STAND 34G1546-Y-B
4 PANEL BRACKET 15G6207-L-3 11 BASE 34G6203-Y-2B
5 PANEL BRACKET 15G6207-R-3 12 RUBBER FOOT 12G394-3
6 REAR COVER 34G6202-Y-1B 13 MYLAR 52G6025-11-925
7 SHIELD 85G6119-1
14
5.2 Software Flow Chart
AOC 176V
1
2
N
4
5
Y
6
7
Y
N
N
3
18
9
10
Y
N
N
12
Y
14
19
N
11
13
15
17
N
Y
N
Y
16
Y
Page 15 of 54
AOC 176V
1) MCU initialize.
2) Is the EPROM blank?
3) Program the EPROM by default values.
4) Get the PWM value of brightness from EPROM.
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 EPROM.
Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an 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 16 of 54
5.3 Electrical Block Diagram
_
_
5.3.1 Main Board
AOC 176V
LCD Interface
(CN503)
MCU
W78E65P-40
(U601)
EEPROM
AT24 C16N
(U602)
EPR_SDA
EPR_SCL
Scalar TSU56AK-LF
(Include ADC,OSD)
(U401)
H sync
V sync
RGB
Connector
(CN301)
D-Sub
D_H sync
D_V sync
D_RGB
DVI-I only
Connector
(CN302)
DB15_SDA,
DB15
SCL
EEPROM
24C02
(U301)
(U302)
DDC2_SDA,
DDC2
EEPROM
24C02
SCL
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