AOC NC AG191A User manual

19" LCD Color Monitor I-INC AG191A
1
Service
Service
Service
Horizontal Frequency
31-80 kHz
TABLEOFCONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
Table Of Contents.......…….................……...........…........1
Revision List.…........................………................……......2
Important Safety Notice.………….…..................……......3
1.Monitor Specification.................................………........4
2.LCD Monitor Description…………………………….......6
3. Operation Instruction…………...............……...........7
3.1.General Instructions...........................…...........7
3.2. Control Button…………….…..............……...............7
3.3 Adjusting the Picture...........................…............8
4. Input/Output Specification............……………............13
4.1.Input Signal Connector............………….................13
4.2.Factory Preset Display Modes.........................14
4.3.Panel Specification.....………………..................15
5. Block Diagram…….…..................…………................17
5.1.Software Flow Chart…………………....……….........17
5.2.Electrical Block Diagram…………..…..…………...19
6.Schematic……………...............................….....20
6.1 Main Board…………..............................................20
6.2 Power Board....……………....................................27
7.PCB Layout..………….....................................30
7.1.Power Board…......................................................30
7.2.Key Board…..……...............................................32
8. Maintainability………...............................................33
8.1. Equipments and Tools Requirement.....................33
8.2. Trouble Shooting…………....................................32
9. White-Balance, Luminance adjustment...................37
10.Monitor Exploded View……..……………................39
11. BOM List....…….....................................................40
12.Different Parts List…..............................................47
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

19" LCD Color Monitor I-INC AG191A
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Revision List
Revision Date Revision History TPV Model
T96HM5DTG6HZAIP
T96HM5DTG6ZHAIP
T96HM5NTG6HZAIP
A00 Jan.-10-07 First Version Release
T96HM5NTG6ZHAIP

19" LCD Color Monitor I-INC AG191A
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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The
special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock,
fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC.
AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)

19" LCD Color Monitor I-INC AG191A
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1. Monitor Specifications
Driving system TFT Color LCD
LCD Panel Size 48cm(19.0")
Pixel pitch 0.294mm(H) x 0.294mm(V)
Video R,G,B Analog Interface
Digital(Dual-Input Model)H/VTTL
Input H-Frequency 31KHz – 80KHz
V-Frequency 55 – 75Hz
Display Colors 16.2M Colors
Max. Resolution 1280 x 1024 @75Hz
Plug & Play VESA DDC2B
TM
ON Mode ≤36.7W
EPA ENERGY STAR
®
OFF Mode ≤2W
Audio output Rated Power 1.5W rms (Per channel)
Input Connector D-Sub 15pin
DVI-D 24pin (Dual-Input Model)
Maximum Screen Size Hor. :376.32mm
Ver. :301.056mm
Power Source 100~240VAC,50/60HZ
Environmental
Considerations
Operating Temp: 0° to 40°C
Storage Temp.: -20° to 60°C
Operating Humidity: 20% to 80%
Dimensions 406(W)×408 (H)×210(D) mm
16.0”(W)×16.1”(H)×8.3”(D)
Weight (GW/NW) 6.5 kg / 5.0 kg
14.3lb/11.0lb

19" LCD Color Monitor I-INC AG191A
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2. LCD Monitor Description
Assembly Description
The LCD MONITOR will contain a power board and a key 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
AC-IN
100V-240V
Power Board
Flat Panel and
CCFL Backlight
PANEL
（Include Main Board）
Key board
RS232 Connector
For white balance
adjustment in factory
mode
HOST Computer
CCFL Drive.
Video signal, DDC

19" LCD Color Monitor I-INC AG191A
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Dimensions

19" LCD Color Monitor I-INC AG191A
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3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The control buttons are located in the front 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: Press this button to switch ON/OFF of monitor’s power.
• Power Indicator: Green — Power On mode. Orange — Off mode.
• MENU / ENTER: 1. Activate the OSD menu or adjust the function settings and confirmation or 2. Exit OSD menu
when in volume OSD status.
• Volume < >: 1. activates the volume control when the OSD is OFF.
2. Navigate through adjustment icons when OSD is ON or adjust a function when function is activated.
• Auto Adjust button: When OSD menu is in off status, press this button to activate the Auto Adjustment function.
(The Auto Adjustment function is used to optimize the H-Position, V-Position, Clock and Focus.)

19" LCD Color Monitor I-INC AG191A
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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.

19" LCD Color Monitor I-INC AG191A
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19" LCD Color Monitor I-INC AG191A
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19" LCD Color Monitor I-INC AG191A
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19" LCD Color Monitor I-INC AG191A
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19" LCD Color Monitor I-INC AG191A
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4. Input/Output Specification
4.1 Input Signal Connector

19" LCD Color Monitor I-INC AG191A
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4.2 Factory Preset Display Modes

19" LCD Color Monitor I-INC AG191A
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4.3 Panel Specification
HannStar Display model HSD190SEN1-B is a color active matrix thin film transistor (TFT) liquid crystal display
(LCD) that uses amorphous silicon TFT as a switching device. This model is composed of a TFT LCD panel, the
voltage reference, common voltage, DC-DC converter, column, and row driver circuit. This TFT LCD has a 19-inch
diagonally measured active display area with SXGA resolution (1024 vertical by 1280 horizontal pixel array).
4.3.1 Display Characteristics

19" LCD Color Monitor I-INC AG191A
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4.3.2 Optical Characteristics
4.3.3 Parameter guide line for CCFL Inverter
TFT LCD Module:
Back Light Unit:

19" LCD Color Monitor I-INC AG191A
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5. Block Diagram
5.1 Software Flow Chat
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
15
Y
N16
17
19
Y
N
18

19" LCD Color Monitor I-INC AG191A
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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?

19" LCD Color Monitor I-INC AG191A
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5.2 Electric Block Diagram
Power Board

19" LCD Color Monitor I-INC AG191A
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6. Schematic
6.1 Main Board
WP
B_D4
C24
0.1uF/16V
R31 100 1/ 16W
FB6
600 OHM
1 2
R190
NC / 10K 1/ 16W
R12 4.7K 1/ 16W
B_D12
R177 4.7K 1/ 16W
3.3V
B_D15
B_D18
5V
B_D15
F_D0
F_D13
R194 10K 1/16W
Y1
14.318MHZ
C152
0.1uF/16V
A,B PORT SWAP
R34,R36 NC_20060421
R187 22 1/16W
R20 10K 1/16W
F_D16
R26 0
R17 22 1/ 16W
B_D19
RSDS/LVDS/TTL
F_D5
TP78
SCALER
A
TSUM17AK
A2
77Thursday, April 27, 2006
Tit le
Size Document Number Rev
Dat e: Sheet of
B_D7
Q11
PMBS3904
H1
1
VDVI
FB408
600 OHM
1 2
L1
80ohm
1.8V
3.3V
3.3V
F_D3
R34 NC
5V
VSI
F_D2
OSP
D20
NC/UDZS5.6B
1 2
C28 22pF
5V
F_D0
R199 1K 1/ 16W
C154
0.1uF/16V
LED_O
B_D11
3.3V
3.3V
B_D0
F_D1
+ C163
4.7uF /35V
C29 22pF
Remove R24_20060421
STH_B
B_D19
B_D8
R198 47 1/16W
R536
4.7K 1/ 16W
Q13
PMBS3906
F_D9
B_D5
F_D10
R27 10K 1/16W
R8 100 1/16W
KEY1
C14 0. 047uF
TP84
R218 4.7K 1/ 16W
L3
80ohm
3.3V
TP80
R189 47 1/16W
H2
1
VMPLL
HSI
DDC_SCL
F_D12
F_D4
+
C157
10uF/ 16V
C155
0.1uF/16V
F_D10
B_D17
F_D17
VDDC
H13
1
TP7 3 R191 47 1/16W
R37 100 1/16W
R32 4. 7K 1/16W
R_IN-
ESP
R533 NC
AVDD
F_D11
F_D18
B_D2
B_D3
TP7 4
C15 0. 047uF
C17 0. 047uF
VGA_DET
B_D10
VDDP
DDC_WP
KEY2
R30 4. 7K 1/16W
B_D0
F_D14
R535 220K 1/16W
R23 4.7K 1/16W
H8
1
R530
2K 1/16W
VCTRL
PWR
L2
80ohm
F_D13
C5
0.1uF /16V
C6
0.1uF /16V
R18 22 1/ 16W
VPLL
3.3V
R36 NC
C27
0.1uF
B_D1
F_D6
C19
0.1uF/16V
H6
1
STH_F
FB407
600 OHM
1 2
R532 NC
R534 NC
B_D9
F_D8
U402
SST25VH010
1
2
3
4 5
6
7
8
CE#
SDO
WP#
VSS SDI
SCK
HOLD#
VDD
U401
TSUM17AK
59
56
57
54
58
55
53
63
64
51
62
61
70
72
71
73
79
21
108
32
33
109
110
111
112
113
114
118
119
120
121
122
123
124
125
126
127
107
106
105
41 47
39
40
42
43
44
45
46
48
49
38 96 116
67 12
104
102
11
14 68
65
66
36
37
29
50 97
69
78
20
22
23
24
27
28
30
31
35
76
77
19
100
101
98
99
93
94
91
92
89
90
9
10
15
16
17
18
2
3
5
6
7
8
128
1
80
81
88
87
86
85
84
83
82
25
26
75
74
52 34 4 95 103 115 117 60
13
RIN0P
GIN0P
SOGIN0
BIN0 P
RIN0N
GIN0N
BIN0 N
HSYNC0
VSYN C0
REXT
REFP
REFM
SDO
SCK
SCZ
SDI
GPIO_P27/PWM1
PWM1/GPI O_P25
NC/ LVACKM/ NC
XI N
XOU T
RA1P/ LVA2P/ RA2
RA1N/LVA2M/RA3
RA2P/ LVA1P/ RA4
RA2N/LVA1M/RA5
RA3P/ LVA0P/ RA6
RA3N/LVA0M/RA7
CLKAP/ LVB3P/LH SY NC
CLKAN/LVB3M/LVSYNC
CLKBP/ LVBCKP/ LCK_OD D
CLKBN /LVBCK M/LDE
NC/LVB2P/NC
NC/LVB2M/NC
BB1P/LVB1P/ BB2
BB1N/ LVB1M/BB3
BB2P/LVB0P/ BB4
BB2N/ LVB0M/BB5
NC/ LVACKP/ NC
GA3N/LVA3M/GA7
GA3P/ LVA3P/GA 6
GND GND
RX2P
RX2N
RX1P
RX1N
AVDD_DVI
RX0P
RX0N
RXCKP
RXCKN
GND GND GND
VDDP
VDDC
MOD E[ 1]
MOD E[ 0]
VCTRL
VDDP
VDD_OTP
DDCA_SDA
DDCA_SCL
DDCD_SDA
DDCD_SCL
PWM0/GPI O_P26
AVDD_DVI
VDDC
GPIO_P15
PWM2/GPI O_P24
GPIO_P16
GPIO_P17/SAR0
GPIO_P00/SAR1
GPIO_P01/SAR2
GPIO_P06
GPIO_P07
GPIO_P13
GPIO_P14
GPIO_P16
DDCROM_SDA
DDCROM_SCL
RST
GA2P/NC /GA4
GA2N/N C/GA5
GA1P/NC /GA2
GA1N/N C/GA3
BA3P/N C/BA6
BA3N/NC/BA7
BA2P/N C/BA4
BA2N/NC/BA5
BA1P/N C/BA2
BA1N/NC/BA3
RB1P/NC/RB2
RB1N/NC/RB3
RB2P/NC/RB4
RB2N/NC/RB5
RB3P/NC/RB6
RB3N/NC/RB7
GB1P/NC /GB2
GB1N/N C/GB3
GB2P/NC /GB4
GB2N/N C/GB5
GB3P/NC /GB6
GB3N/N C/GB7
BB3P/N C/BB6
BB3N/NC/BB7
ESP
OSP
GPO0
GPO1
GPO2
GPO3
GPO4
GPO5
GPO6
GPIO_P02/SAR3
GPIO_P03
GPIO_P22
GPIO_P23
AVDD_ PLL
AVDD_MPLL AVDD_MPLL
VDDP VDDP VDDP
VDDC
AVDD_ ADC
GND
R42 100 1/16W
B_D4
F_D2
R193 NC
VPLL
R531
100 1/16W
3.3V
SOGI
POL
F_D7
F_D15
VDDP
1.8V
B_D9
C151
0.1uF/16V
R43 100 1/16W
R28 390 1%
R140 4. 7K 1/16W
F_D3
B_D11
R2 22 1/16W
VDVI
B_D8
D25
LL4148WP
PWR_LEDO
BL_BRIGHT
F_D19
FB1
600 OHM
1 2
B_D17
OE
5V
5V
LED_B
R176 39K 1/16W
R15 NC
PWR_LEDB
H7
1
C16 0. 047uF
STHB,F SWAP 10/06
B_D6
+ C23
4.7uF/16V
H12
1
C158
0.1uF/16V
R33 10K 1/16W
Change Flash WP por t_20060421
B_D10
VMPLL
B_D16
C153
0.1uF /16V
G_IN-
Flash_WP_Pull low _2006042 1
F_D14
R192 NC
3.3V
TP86
R7 100 1/16W
C10 0.1uF/16V
R195 47 1/16W
SDA
Q14
PMBS3904
R44 100 1/16W
F_D8
H3
1
AMP_MUTE
D26
LL4148WP
R175 39K 1/16W
TP85
B_D12
B_D18
FB2
1000 OHM
1 2
C4
0.1uF /16V
C12 0. 047uF
R24 4. 7K 1/16 W
C26 NC
R188 10K 1/16W
F_D6
R1 22 1/16W
F_D7
+ C21
10uF/ 16V
G_IN+
C229
0.1uF
R35 100 1/16W
FB406
600 OHM
B_D6
LED_O
B_D13
LED_B
U1
AT24C16N-10SC-2.7
1
2
3
45
6
7
8A0
A1
A2
GNDSDA
SCL
WP
VCC
F_D[0..19]
B_D3
B_D7
Q12
PMBS3906
H11
1
B_D13
C7
0.1uF /16V
TP79
TP7 7
VDDC
F_D4
C3
0.1uF /16V
H5
1
Remo v e R2 6 an d
C26_20060427 by LEO
R_IN+
F_D18
F_D19
C22
0.1uF/16V
R11 4.7K 1/ 16W
R19
10K 1/16W
24C16_WP_Pull high_20060421
VOLUME
BL_EN
VCTRL
C9
0.1uF /16V
B_D14
R217 4.7K 1/ 16W
F_D17
C160
0.1uF/16V
C13 0. 047uF
3.3V
B_IN+
PWR_EN
F_D9
B_D16
WP
R21 22 1/ 16W
Q15
CHT2907
C
B
E
H4
1
TP9 6
3.3V
AVDD
3.3V
B_D2
F_D12
TP81
B_D[ 0..19 ]
F_D11
B_D1
R16 22 1/ 16W
AVDD
STV1
B_IN -
F_D1
R529
51 1/16W
C20 0. 047uF
D21
NC/UDZS5.6B
1 2
B_D14
DDC_SDA
CPV
F_D15
R141 100 1/16W
3.3V
AMP_STBY
F_D16
R29
NC/ 1M 1/16W
TP76
SCL
C8
0.1uF/16V
R22 22 1/ 16W
B_D5
C156
0.1uF/16V
LP
R219
4.7K 1/16W
F_D5
R173 4.7K 1/ 16W