AOC AOC2241VG User manual

Service Manual AOC2241VG
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LCD 显示器维修手册
Custom：AOC
Model：AOC2241VG

Service Manual AOC2241VG
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REVISION LIST
Version Release Date Revision History Model TPV Model No
A00 Aug-30-2010
Initial Release AOC2241VG TC9GNT8NWVA1HNJ
TC9GNTN8WVA1HNJ
TC9GNTNYWVA1HNJ
TC9GNTNBWVK2HNJ
TC9SNTNYWVA1HNJ
TC9GNTNMWVK2HNJ

Service Manual AOC2241VG
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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------------------------------------------------------------------------------------------------------10
3. Interface description ------------------------------------------------------------------------------------------------------ 11
3.1 VGA interface-------------------------------------------------------------------------------------------------------------11
3.2 DVI interface--------------------------------------------------------------------------------------------------------------11
3.3 USB interface-------------------------------------------------------------------------------------------------------------12
4. Panel Feature ---------------------------------------------------------------------------------------------------------------13
4.1 General Specifications--------------------------------------------------------------------------------------------------13
4.2 Electrical Absolute Ratings --------------------------------------------------------------------------------------------13
4.3 Electrical Characteristics-----------------------------------------------------------------------------------------------13
4.4 Optical Characteristics--------------------------------------------------------------------------------------------------14
4.5 TFT LCD Module Block Diagram-------------------------------------------------------------------------------------15
4.6 LCD module input terminal pin assignment------------------------------------------------------------------------15
5. Block diagram--------------------------------------------------------------------------------------------------------------- 16
5.1 LCD Block diagram------------------------------------------------------------------------------------------------------16
5.2 Main board Block diagram---------------------------------------------------------------------------------------------16
5.3 Power board Block diagram-------------------------------------------------------------------------------------------17
5.4 LCD software flow chart------------------------------------------------------------------------------------------------18
6. Circuit Schematic ---------------------------------------------------------------------------------------------------------- 19
6.1 Main board ---------------------------------------------------------------------------------------------------------------19
6.2 Power board --------------------------------------------------------------------------------------------------------------25
6.3 Invweter part --------------------------------------------------------------------------------------------------------------26
6.3 Key board------------------------------------------------------------------------------------------------------------------27
7. Monitor exploded view----------------------------------------------------------------------------------------------------28
8. PCB Layout ------------------------------------------------------------------------------------------------------------------ 31
8.1 Main board ----------------------------------------------------------------------------------------------------------------31
8.2 Power board --------------------------------------------------------------------------------------------------------------33
8.3 Key board------------------------------------------------------------------------------------------------------------------34
9. Maintainability ---------------------------------------------------------------------------------------------------------------- 35
9.1 Maintainability Requirement-------------------------------------------------------------------------------------------35
9.2 Trouble Shooting---------------------------------------------------------------------------------------------------------35
9.3 Roft re-wirting step-------------------------------------------------------------------------------------------------------39
9.4 DDC re-wirting step------------------------------------------------------------------------------------------------------43
9.5 Factory mode OSD------------------------------------------------------------------------------------------------------45
10. BOM List---------------------------------------------------------------------------------------------------------------------- 47
10.1 TC9GNTNBWVK2HNJ BOM ------------------------------------------------------------------------------------------47

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1. LCD Specifications
1.1 Product Features
Monitor Model AOC2241VG
LCD Panel
Driving system TFT Color LCD
Active Display Area 558.67mm（21.995inch）diagpnal
473.76mm (W)×296.15mm(H)
Pixel Pitch 0.282 mm×0.282mm
Display Colors 16.7M Colors
Max. Resolution 1680 x 1050@60Hz
Input
Video R,G,B Analog Interface，75ohm,0.7V
DVI digital Interface, 150mV-1200mV
Separate Sync. H/V TTL
H-Frequency 30kHz—81kHz
V-Frequency 56Hz--75Hz
Dot Clock 165MHz
Plug & Play VESA DDC2B /CI
Connector D-Sub 15pin
DVI -D 24pin
USB HUB 1 upstream, 1 downstream 2.0
Power Consumption ON Mode <35W
Power Saving Mode <0.5W
Switch OFF <0.1W
Power Source 90~264VAC,47~63Hz, 1.5A Max supply current
Dimensions(including stand) 522.3mm×413.3mm×186.8mm
Weight (N. W.): 5.15kg
Environmental
Considerations
Operating Temp: 0° to 40°C
Storage Temp.: -20° to 60°C
Operating Humidity : 8% to 80%
Altitude:
Operating ：0~ 3000m (0~ 10000 ft )
Non-Operating：0~ 5000m (0~ 15000 ft )
Safety FCC B CCC IEC950CB etc.

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1.2 Factory preset modes
STANDARD RESOLUTION HORIZONTAL
FREQUENCY VERTICAL FREQUENCY
DOS-mode 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 66.67Hz
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 60kHz 75Hz
1280 × 720 45kHz 60Hz
1280 × 960 60kHz 60Hz
SXGA 1280 × 1024 63.981kHz 60Hz
1280 × 1024 79.976kHz 75Hz
WXGA 1440 × 900 55.93kHz 59.88Hz
1440 × 900 55.469kHz 59.90Hz
WSXGA 1680 × 1050 65.29kHz 59.95Hz
1680 × 1050 64.67kHz 59.88Hz

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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.
The power cord should be connected.
Connect the video cable from the video card of PC to the monitor.
Press the power button to turn on the monitor, the power indicator will light up.
2.1 Control Buttons
Control Description
1 Power Button To turn ON/OFF the moniteor, and power indicator
(Green/Blue and Amber/Orange).
2 Menu / Enter
Active main menu while no OSD display,enter next level on
main menu or sub menu status, or enter last level on
adjustment bar..
Hotkey ,exit
34:3 or wide/ +
Hotkey,Audio volume adjust for VA ,or chang 4:3 or wide
image ratio for SA .
OSD, increase current value of bar, or move to next item of
menu
4 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.
5 Auto / Exit
If there is no any OSD, select video source(DVI/RGB).
Press hold to 2s , it is auto configuration.
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 activate OSD window 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.

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Service Manual AOC2241VG
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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
1
5
6
10
11
15
3.2 DVI Connector
Pin No. Description Pin No. Description
1. TMDS Data 2- 13. TMDS Data 3+
2. TMDS Data 2+ 14. +5V Power
3. TMDS Data 2/4 Shied 15. Ground (for +5V)
4. TMDS Data 4- 16. Hot Plug Detect
5. TMDS Data 4+ 17. TMDS Data 0+
6. DDC Clock 18. TMDS Data 0-
7. DDC Data 19. TMDS Data 0/5 Shield
8. N.C. 20. TMDS Data 5-
9. TMDS Data 1- 21. TMDS Data 5+
10. TMDS Data 1+ 22. TMDS Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock+
12. TMDS Data 3- 24. TMDS Clock-
DVI Connector layout

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3.3 USB(up+down) port
Bottom View
Top View

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4. Panel Feature
The Panel-LM220WE1-TLP1 is a 22 inch wide TFT-LCD module with an intergral CCFL Backlght unit and a 30-pin
2ch –LVDS interface . This module supports 1680×1050 WSXGA+ 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
4.3 Electrical Characteristics
a) TFT LCD module

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b) Backlight unit
4.4 Optical Specifications

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4.5 TFT LCD Module Block Diagram
4.6 LCD module input terminal pin assignment
Connector diagram

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5.Block Diagram
5.1 LCD Block Diagram
5.2 MainBoard Block Diagram---715G3737
Crystal 12MHz
(X401)
Panel Interface
(CN408/409)
Scalar NT68668FG-QFG-128
(Include ADC, OSD, MCU)
(U401)
D-Sub
Connector
(CN101)
EEPROM
PM25LD020C
(U402)
H sync
V sync
Key Board
Control
(CN401/402)
Voltage converter
5V
5V 3.3V 1.8V
DVI
Connector
(CN102)
DC-AC inverter
AC-DC(5V/12V)
Power Board
Main Board
Key board
PC- VGA
/DDC
2 CCFL backlight
Panel
LVDS
AC supply
90V-264V
Monitor Block Diagram
PC- DVI
/DDC
Input signal
USB
HUB
USB cable
From PC
USB
Memory

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5.3 Power Board Block Diagram
Fuse
EMI
Rectifier
Smoothing
Capacitor
C907
Transformer
T901
MOS
Q901
IC-PWM
IC901
16V
Rectifier
5V
Rectifier
16V
5V
Sense
resistor
Vcc
Rectifier
regulating
Sampling
PhotoCoupler
Vcc
Open Lamp Protection
16V DC
5V
DIM
DC-AC
Transformer
T801
High Voltage
Output
Resonance NET
Switching MOS
Q805-Q806
AO4620
AC input
100-240V
2- CCFL
PWM Control IC
IC801-TA9687
Current Sampling
Power part
Inverter part
Power/ inverter Board Block Diagram

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5.4 Software Flow Chart
Start
Initial_MCU
Check if DataBuffer Is blank
Check if Sum is changed ?
To Write default values
Read parameter_from Buffer
PowerHandler
Init_GlobalVariables
Initial_MCU Device
while
InputTiming
ModeHandler
MenuHandler
DebugHandler
if standby mode?
Brightness
Contrast
Language
InputType
InputTimingStableCounter
OsdCounter
PowerDownCounter
LED turn-on
Show power on logo
if factory mode?
No signal message
UnsupportModeFlag
END
OSD Menu
Software Flow Chart
InputTiming
Phaes/Frequency
Image setup
Color
O
Enter factory mode OSD
Y
N
Y

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6. Circuit Schematic
6.1 Main Board 1---715G3737-M01
Audio_EN
DDCSCL1
VCC3.3
05.PANEL INTERFACE
05.PANEL INTERFACE
VLCD
PA[0..9]
PB[0..9]
02.INPUT
02.D-SUB INPUT
R0+
R0-
SOG_DET
G0+
G0-
B0+
B0-
+5V
AHS0
AVS0
DDCSCL1
DDCSDA1
EDID_WP
VGA_CABLE_DET
RX2+
+5V
RX1+
RX0-
DDCSDA2
Audio_DET
G0+
DDCSCL2
B0+
RXC+
DVI_CABLE_DET
PS_EN
+5V
EDID_WP
B0-
SOG_DET
EDID_WP
VLCD
Panel_ON
PB[0..9]
AVS0
RX2-
VCC1.8
R0+
RX0+
VLCD
EDID_WP
04.SCALER
04.SCALER
Adj_BACKLIGHT
on_BACKLIGHT
Audio_EN
Audio_DET
PS_EN
Panel_ON
PB[0..9]
PA[0..9]
R0+
R0-
SOG_DET
G0+
G0-
B0+
B0-
AHS0
AVS0
DDCSCL1
DDCSDA1
EDID_WP
VGA_CABLE_DET
RXC+
RXC-
RX2-
RX2+
RX1+
RX1-
RX0-
RX0+
DDCSCL2
DDCSDA2
DVI_CABLE_DET
DVI_HPD
VCC1.8
VCC3.3
+5V
R0-
PA[0..9]
Adj_BACKLIGHT
RXC-
VCC3.3
06.POWER
06.POWER
Adj_BACKLIGHT
on_BACKLIGHT
Audio_EN
Audio_DET
PS_EN
Panel_ON
+5V
VCC3.3
VCC1.8
VLCD
AHS0
DDCSDA1
DVI_HPD
VGA_CABLE_DET
RX1-
on_BACKLIGHT
03.DVI INPUT
03.DVI INPUT
RX0+
RX0-
RX1-
RX1+
RX2+
RX2-
RXC-
RXC+
DDCSCL2
DDCSDA2
DVI_CABLE_DET
EDID_WP
+5V
DVI_HPD
G0-
VCC1.8
+5V
+5V

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Input part---VGA+DDC
C113
100NF 25V
VGA_5V
G0+
VGA_5V
BIN0
D101
BAV70
3
1
2
DDCSDA1
HSIN0
R126
2K2 1/16W 5%
CN101
DB15
1
6
2
7
3
8
4
9
5
11
12
13
14
15 10
17 16
R119
100R 1/16W 5%
R107
75R 1/16W 1%
DDCSCL_A
R109
0R05 1/16W
RIN0
R103
0R05 1/16W
GIN0-
B0- 5
C104
47N16V
BIN0-
R114 4K7 1/16W 5%
R122 0R05 1/10W
VSIN0
VGA_CABLE_DET 5
DDCSCL1
R110
0R05 1/16W
EDID_WP
DDCSDA1
ESD_VGA
R118
0R05 1/16W
G0- 5
C102
47N16V
C114
100NF 25V
C106
5PF 50V
B0+
GIN0
RIN0
U102
AOZ8902CIL
1
2
3 4
5
6
CH1
VN
CH2CH3
VP
CH4
HSIN0
R0+ 5
+5V4,5,7
DDCSDA_A
C105 47N16V
C107
47N16V
C101
220N16V
DDCSCL1
R0- 5
+5V
R116 22K 1/16W 5%
DET_VGA
R142
470R 1/16W 5%
R124 100R 1/16W 5%
R0+
DDCSDA_A
EDID_WP4,5
SOG_DET 5
R113
100R 1/16W 5%
U103
AOZ8902CIL
1
2
3 4
5
6
CH1
VN
CH2CH3
VP
CH4
R115 4K7 1/16W 5%
R102 100R 1/16W 5%
C111
NC/22pF 50V
G0+ 5
ESD_VGA
AHS0 5
RIN0-
R112
75R 1/16W 1%
VSIN0
C103
5PF 50V
R0-
BIN0
R121
100R 1/16W 5%
DDCSDA15
DDCSCL_A
VGA_CABLE_DET
GIN0-
HSIN0
R120
75R 1/16W 1%
DUAL D
OTS B
3 7Monday, January 25, 2010 715G3737-M0D <
称爹>
D-SUB I/O
G3737-M0D-000-0H4K-10-100125
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME
称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
R125
2K2 1/16W 5%
C120
1N50V
DDCSCL15
C182
22pF 50V
R105
100R 1/16W 5%
C108
47N16V
R123 100R 1/16W 5%
R111
100R 1/16W 5%
RIN0
B0-
RIN0-
R104
0R05 1/16W
DET_VGA
C110
47N16V
ESD_VGA
VSIN0
C109
5PF 50V
R101
100R 1/16W 5%
VGA_5V
GIN0
R106
100R 1/16W 5% B0+ 5
BIN0-
C112
NC/22pF 50V
C181
22pF 50V
BIN0
R117
0R05 1/16W
U101
AT24C02BN-SH-T
1
2
3
4
5
6
7
8A0
A1
A2
VSSSDA
SCL
WP
VCC
ZD101
RLZ5.6B
G0-
GIN0
R108
100R 1/16W 5%
AVS0 5