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18.5" LCD Color Monitor AOC e940Swa
Service
Service
Service
Horizontal Frequency
30-80 kHz
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents..........................................................1 6.1 Software Flow Chart.........................................17
Table Of Contents..........................................................1
Description Page
Revision List.................................................................2 6.2 Electrical Block Diagram.................................19
Revision List.................................................................2
1. Monitor Specification..................................................4 7. Schematic.................................................... 21
1. Monitor Specification..................................................3
2. LCD Monitor Description........................................6 7.1 Main Board..........................................................21
2.LCD MonitorInstruction.............................................6
3. Operation Description........................................4 7.2 Power Board.......................................................26
3. Operation Instruction.............................................5
3.1 General Instructions...................................................7 8. PCB Layout..........................................................27
3.1 General Button....................................................7
3.2 Control Instructions...................................................5 8.1 Main Board.....................................................27
3.2 Control Button....................................................5
3.3 Adjusting the Picture..........................................7 8.2 Power Board........................................................28
3.3 Adjusting the Picture..........................................5
4. Input/Output Specification.......................................11 8.3 Key Board.......................................................29
4. Input/Output Specification.......................................8
4.1 Input Signal Connector.......................................11 9. Maintainability........................................................30
4.1 Factory Preset Display Modes...........................12
4.2 Input Signal Connector.......................................8 9.1. Equipments and Tools Requirement.....................30
4.2 Factory Preset Display Modes.........................9
5 Panel Specification..................................................13 9.2. Trouble Shooting................................................31
5 Panel Specification..................................................10
5.1 Display Characteristics....................................13 10. White-Balance, Luminance adjustment.................36
5.1
5.2 Display Characteristics....................................10
Optical Characteristics.....................................14 11. Monitor Exploded View...................................38
5.2
5.3 Optical Characteristics......................................10
Electrical Characteristics.................................15 12. BOM List..............................................................39
5.3 Block Diagram...............................................17
6. Parameter guide line for CCFL Inverter.................10
6 Block Diagram 11
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.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
1
18.5" LCD Color Monitor AOC e940Swa
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 might 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 radiations 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.)
2
18.5" LCD Color Monitor AOC e940Swa
Revision List
Version Date Revision History Remark
A00 May.-20-2010 Initial release T89ANRNQWWA26NE
3
18.5" LCD Color Monitor AOC e940Swa
1. Monitor Specification
4
18.5" LCD Color Monitor AOC e940Swa
5
18.5" LCD Color Monitor AOC e940Swa
2. LCD Monitor Description
The LCD MONITOR will contain a main board, a power board, an audio 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
Flat Panel and
CCFL Driver
CCFL backlight
PWPC board
Main Board RS232 Connector
(Include: adapter, inverter)
For white balance
adjustment in factory
mode
Key board
AC-IN Video signal DDC
100V-240V
HOST Computer
6
18.5" LCD Color Monitor AOC e940Swa
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control knobs are located at front panel of the
monitor.By changing these settings, the picture can be adjusted to your personal preferences.
3.2 Control Buttons
4:3 or wide image ratio hot key
When there is no OSD, press continuously to change 4:3 or wide image ratio. (If the product screen size is 4:3 or
input signal resolution is wide format, the hot key is disable to adjust)
Auto configure hot key
When there is no OSD, press Auto/Source button continuously about 2 second to do auto configure (Only for the
models with dual or more inputs).
Volume adjustment hot key
When there is no OSD,press Volume() to active volume djustment bar,press or to adjust volume(Only for the
models with speakers)
3.3 Adjusting the Picture
OSD Setting
1) Press the MENU-button to activate the OSD window.
2) Press or to navigate through the functions. Once the desired function is highlighted, press the
MENU-button to activate sub-menu . Once the desired function is highlighted, press MENU-button to activate it.
3) Press or to change the settings of the selected function. Press or to select another function in
sub-menu . Press AUTO to exit . If you want to adjust any other function, repeat steps 2-3.
4) OSD Lock Function: To lock the OSD, press and hold the MENU button while the monitor is off and then press
power button to turn the monitor on. To un-lock the OSD - press and hold the MENU button while the monitor is
off and then press power button to turn the monitor on.
Notes:
1) If the product has only one signal input, the item of "Input Select" is disable to adjust.
2) If the product screen size is 4:3 or input signal resolution is wide format, the item of "Image Ratio" is disable to
adjust.
3) One of DCR, Color Boost, and Picture Boost functions is active, the other two function is turned off accordingly.
7
18.5" LCD Color Monitor AOC e940Swa
Luminance
Image Setup
8
18.5" LCD Color Monitor AOC e940Swa
Color Temperature
Color Boost
Picture Boost
OSD Setup
9
18.5" LCD Color Monitor AOC e940Swa
Extra
Reset
LED Indicator
10
18.5" LCD Color Monitor AOC e940Swa
4. Input/Output Specification
4.1 Input Signal Connector
D-SUB connector
11
18.5" LCD Color Monitor AOC e940Swa
4.2 Factory Preset Display Modes
12
18.5" LCD Color Monitor AOC e940Swa
5 Panel Specification
5.1 Display Characteristics
13
18.5" LCD Color Monitor AOC e940Swa
5.2 Optical Characteristics
14
18.5" LCD Color Monitor AOC e940Swa
5.3 Electrical Characteristics
1.TFT LCD Module:
15
18.5" LCD Color Monitor AOC e940Swa
2.Back Light Unit:
16
18.5" LCD Color Monitor AOC e940Swa
6. Block Diagram
6.1 Software Flow Chart
1
Y
2 3
N
4
N
5
Y
6
N
7 8
Y
9
N
10 11
Y
N N
12 13
Y Y
N
14 15 16
Y
17
N
18 19
Y
17
18.5" LCD Color Monitor AOC e940Swa
REMARK:
1) MCU initialize.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
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 EEprom.Turn on the LED and set it to green color. Scalar initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they're 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?
18
18.5" LCD Color Monitor AOC e940Swa
6.2 Electrical Block Diagram
6.2.1 Scalar Board
Crystal 12MHZ LCD Interface
(X401) (CN301)
FLASH MEMORY Scalar NT68668AFG
Pm25LD020C-SCE Key Control
(Include :MCU,ADC,OSD etc)
(U402) Interface
(U401) (CN401)
H sync
V sync
RGB
D-Sub
Connector
(CN101)
DDC1_SCL
DDC1_SDA
EEPROM
CAT24C02WI
(U101)
19
18.5" LCD Color Monitor AOC e940Swa
6.2.2 Inverter / Power Board
12V L801 ZD801
LED
(CN802)
MOSFET
(Q801)
DIM PWM Control
TA9690GN LED
ENA (IC801,IC802) (CN803)
20
18.5" LCD Color Monitor AOC e940Swa
7. Schematic
7.1 Main Board
715G4002M01000004S
FB102
H_Sy nc R102 0R05 1/10W R103 100OHM1/16W VGA_B+ 1 2 R105 C102
V_Sy nc DSUB_H 5 DSUB_B+ 5
R104 100OHM1/16W 0R05 1/10W 10OHM1/16W 47nF 16V
DSUB_V 5
R108 C105
11/30/2009 5PF 50V
R106 R107 C103 C104 C127 C128 75OHM 1/16W
2.2K 1/16W 2.2K 1/16W 22P 50V 22P 50V NC/22P 50VNC/22P 50V
VGA_B- R109 C106
DSUB_B- 5
47 OHM 1/16W 47nF 16V
U104 ESD_VCC R110 C107
DSUB_SOG 5
AOZ8105CI FB103 470 OHM 1/16W 1N 50V
DSUB_SCL 1 6 H_Sy nc
2 I/O1 I/O4 5 VGA_G+ 1 2 R111 C108
DSUB_SDA 3 GNDVDD 4 V_Sy nc 0R05 1/10W 10OHM1/16W 47nF 16V DSUB_G+ 5
CN101 I/O2 I/O3 C125
16
D-SUB 15P 100N 16V R112 C109
R101 10 11/30/2009 5PF 50V
DDC1_SCL DSUB_SCL 15 5 DET_VGA 75OHM 1/16W
5 DDC1_SCL DSUB_5V
9
100OHM1/16W 14 4 VGA_G- R114 C110
VGA_B- DSUB_G- 5
8 C124 47 OHM 1/16W 47nF 16V
13 3 VGA_B+ ZD101 100N 16V
R113 7 VGA_G- RLZ5.6B
DDC1_SDA DSUB_SDA 12 2 VGA_G+ U103 ESD_VCC
5 DDC1_SDA VGA_R-
6 AOZ8105CI FB101
100OHM1/16W 11 1 VGA_R+ VGA_G+ 1 6 DET_VGA
2 I/O1 I/O4 5 VGA_R+ 1 2 R115 C111
VGA_R+ 3 GNDVDD 4 VGA_B+ 0R05 1/10W 10OHM1/16W DSUB_R+ 5
47nF 16V
I/O2 I/O3
17
C126
100N 16V R116 C113
11/30/2009 5PF 50V
75OHM 1/16W
2010/1/13 VGA_R- R117 C114
modify type DSUB_R- 5
47 OHM 1/16W 47nF 16V
CN102
JACK DVI_5V VCC3.3
CMVCC1 DSUB_5V
8
VSY NC
2
1
15 DET_DVI
SY NC GND 6 R118 100OHM1/16W DDC2_SCL R133
DDC SCL DDC2_SDA DDC2_SCL 5
7 R119 100OHM1/16W 390K +/-5% 1/16W D101
DDC SDA DDC2_SDA 5
14 BAV70
+5V 16 DVI_HPD R120 10K+-5%1/16W FB106 300 OHM
HPD DET_VGA R135 ESD_VCC
3
11 100K 1/16W
1/3shield 3 C112
2/4shield 19 100N 16V DET_DVI R139 R123 C116
0/5shield 22 220K 1/16W 5% DET_CABLE 5 R124 R125 22K 1/16W 220N16V
clk shield 4.7K 1/16W 4.7K 1/16W U101
18 R126 10OHM1/16W RX0P 8 1
DAT0+ RX0P 5 VCC A0
17 R127 10OHM1/16W RX0N 7 2
DAT0- RX0N 5 WP A1
10 R128 10OHM1/16W RX1P DDC1_SCL 6 3
DAT1+ RX1P 5 SCL A2
9 R129 10OHM1/16W RX1N DDC1_SDA 5 4
DAT1- RX1N 5 SDA VSS
2 R130 10OHM1/16W RX2P 5 DDC_WP
DAT2+ RX2P 5
1 R131 10OHM1/16W RX2N CAT24C02WI-GT3
DAT2- RX2N 5
13
DAT3+ 12 CMVCC1
DAT3- 5 FB104 FB105 DVI_5V
DAT4+ 4
DAT4- 21
DAT5+ 3,4,5 CMVCC1
2
1
20 300 OHM 300 OHM
DAT5- 23 R132 10OHM1/16W RXCP C115
clk+ RXCN RXCP 5
24 R134 10OHM1/16W C118 D102 100N 16V
GND
GND
clk- RXCN 5
1N 50V BAV70 C119
1N 50V
ESD_VCC1
26
25
3
U107 ESD_VCC1 U105 ESD_VCC1 U106 ESD_VCC1
AOZ8105CI AOZ8105CI AOZ8105CI C117
1 6 1 6 1 6 R136 220N16V
2 I/O1 I/O4 5 2 I/O1 I/O4 5 2 I/O1 I/O4 5 R137 R138 22K 1/16W
3 GNDVDD 4 3 GNDVDD 4 3 GNDVDD 4 4.7K 1/16W 4.7K 1/16W U102
I/O2 I/O3 C121 I/O2 I/O3 C122 I/O2 I/O3 C120 8 1
100N 16V 100N 16V 100N 16V 7 VCC A0 2
DDC2_SCL 6 WP A1 3
DDC2_SDA 5 SCL A2 4
SDA VSS
5 DDC_WP
CAT24C02WI-GT3
TPV ( Top Victory Electronics Co . , Ltd. ) OEM MODEL AOC e2040VA Size B
G4002-M0D-000-0040-100416 TPV MODEL e2040VA Rev C
Key Component 2.0.INPUT PCB NAME
<>
Date Tuesday , April 27, 2010 Sheet 2 of 6
21
18.5" LCD Color Monitor AOC e940Swa
CN301
32
29 30
PA[0..9] PB[0..9] 27 28
5 PA[0..9] 5 PB[0..9] PB0 LVB3P LVB0M RXO0- RXO0+ LVB0P
25 26
PA0 LVA3P PB1 LVB3M LVB1M RXO1- 23 24 RXO1+ LVB1P
PA1 LVA3M PB2 LVBCKP LVB2M RXO2- 21 22 RXO2+ LVB2P
PA2 LVACKP PB3 LVBCKM LVBCKM RXOC- 19 20 RXOC+ LVBCKP
PA3 LVACKM PB4 LVB2P LVB3M RXO3- 17 18 RXO3+ LVB3P
PA4 LVA2P PB5 LVB2M LVA0M RXE0- 15 16 RXE0+ LVA0P
PA5 LVA2M PB6 LVB1P LVA1M RXE1- 13 14 RXE1+ LVA1P
PA6 LVA1P PB7 LVB1M LVA2M RXE2- 11 12 RXE2+ LVA2P
PA7 LVA1M PB8 LVB0P LVACKM RXEC- 9 10 RXEC+ LVACKP
PA8 LVA0P PB9 LVB0M LVA3M RXE3- 7 8 RXE3+ LVA3P
PA9 LVA0M 5 6
3 4
1 2
CONN
31
PANEL_VCC
R301 R302 C301
220 OHM 1/4W 220 OHM 1/4W 100N 16V
PANEL_VCC
FB301
1 2
120 OHM
C302
22UF 16V
CMVCC1
2,4,5 CMVCC1
R305
5
6
7
8
10K+-5%1/16W
R306 Q301 U301
D
D
D
D
AO3401A
NC/AO4411
100K 1/16W
G
S
S
S
CMVCC1
R304 C303
4
3
2
1
Q302 R307 220N16V
5 PPWR_ON# NC
22K 1/16W LMBT3904LT1G
R303 C304
4.7K 1/16W 100N 16V
3D
C305 R308
1UF16V NC/10K1/16W
11/30/2009 1 2
G S
AO3401L
T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL AOC e2040VA Size B
G4002-M0D-000-0040-100416 TPV MODEL e2040VA Rev C
Key Component 3.0.OUTPUT PCB NAME
<>
Date Tuesday , April 27, 2010 Sheet 3 of 6
22
18.5" LCD Color Monitor SOT 252
AOC e940Swa
CMVCC1 U702
G1117-33T43UF
CN702
11
VOUT(TAB)
ADJ(GND)
+12V
1
1
2
VIN
3 D707
4 SR34
5
2
3
2
1
6
7 CMVCC1 Both 223 and 252
8 R707
foot-print
1
9 BKLT-VBRI 0R05 1/10W
10 BKLT-EN
D708
SR34 SOT 223
12
CONN R708 VCC3.3
2
NC/0R05 1/10W 5% U701
Dropout voltage must
3 2
VI VO
< 0.8V @ 600mA
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