MA782
Service Manual
TABLE OF CONTENTS
SERVICE WARNING
A. IMPORTANT SAFETY INSTRUCTION
B. SPECIFICATIONS
C. TIMING CHART
D. CONTROL LOCATION
E. CONDUCTION VIEW
F. ADJUSTMENT PROCEDURE
G. TROUBLE SHOOTING HINTS
H. BLOCK DIAGRAM
I. SCHEMATIC DIAGRAM
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3
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WARNING
To prevent from fire or shock hazard,do not expose monitor to any rain or any form of water.High voltage is
inside the monitor so please do not remove the back cover of the cabinet if you are not a qualified
monitor engineer.Contact the local dealer or the nearest
Proview
A. IMPORTANT SAFETY INSTRUCTION
Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in
the user's manual for this product.
1. Read all of these instructions.
2. Save these instructions.
3. Follow all warnings and instructions a marked on the product.
4. Unplug this product from the wall outlet before cleaning.Do not use liquid cleaners or aerosol
cleaners, use a damp cloth for cleaning.
5. Do not use this product near water.
6. Do not place this product on an unstable cart,stand or tablle.The product may fall,causing serious
damage to the product.
7. Slots and openings in the cabinet and the back or bottom are provided for ventilation,to ensure
reliable operation of the product and to protect it from overheating,those openings must not be
blocked or covered.The openings should never be blocked by placing the product on a bed,sofa, rug,
or other similar surface.This product should not be placed in a built-in installation less proper
ventilation is provided.
8. This products should be operated from the type of power source indicated on the marketin label.
If you are not sure of the type of power available, consult your dealer or local power company
9. This product is equipped with a 3-wire grounding type plug,a plug having a third (grounding)
pin.This plug will only fit into a grounding-type power outlet.This is a safety feature,if you are
unable to insert the plug into the outlet,contact your electrician to replace your obsolete outlet.Do
not defeat the purpose of the grounding-type plug.
10. Do not allow anything to rest on the power cord.Do not locate this product where persons will walk
on the cord.
11. If an extension cord is used with this product,make sure that the total of the ampere ratings on the
product plugged into the extension cord to the waplugged into outlet does not exceed 15 ampere.
12. Never push objects of any kind into this product through cabinet slots as they may touch dangerous
voltage points or short out parts that could result in a risk of fire or electric shock.Never spill liquid
of any kind on the product.
13. Do not attempt to service this product yourself,as opening or removing covers may expose you to
dangerous voltage points or other risks.Refer all servicing to service personnel.
14. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the
following conditions.
a. When the power cord or plug is damaged or frayed.
b. If liquid has been spilled into the product.
c. If the product has been exposed to rain or water.
d. If the product does not operate normally,when the operating instructions are followed.Adjust
only those controls that are covered by the operating instructions since improper adjustment of
other controls may result in damage and will often require extension work by a qualified
technician to restore the product to normal operation.
e. If the product has been dropped or the cabinet has been damaged.
branch office if you need help.
f.
If the product exhibits a distinct change in performance,indicating a need for service.
B. SPECIFICATIONS
Maximum Resolution
1.
Recommend Resolution
2.
Synchronization Range
3.
Horizontal
Vertical
Active Display Area
4.
Dot Pitch
5.
Support display colors
6.
Contrast Ratio (Typical)
7.
Luminance of White
8.
Bandwidth
9.
User Control
10.
OSD Function
11.
View Angle CR=5
12.
Horizontal
Vertical
Power Source
13.
Power Consumption
14.
Connection Type
15.
Input Signal
16.
Video
Sync.
Color Temperature
17.
Dimension (WxHxD)
18.
Monitor Weight
19.
Base Operation
20.
Tilt
Power Saving
21.
ON
STAND BY
OFF
Signal Connector Pin Assignment
22.
Pin No.
1. Red 9. V
2. Green 10. Sync. Ground
3. Blue 11. Ground
4. Ground 12. SDA (For DDC)
5. Self Test 13. Horizontal Sync.
6. Red Ground 14. Vertical Sync.
7. Green Ground 15. SCL (For DDC)
8. Blue Ground
Audio signal
23.
1280*1024 @ 75Hz
1280*1024 @ 60Hz
30 – 81 KHz
56– 75 Hz
337.9mm (H) x 270.3mm (V)
0.264(H) x 0.264(V) mm
16.7M color
450:1
260cd/m²
135MHz
4 Key Switch
Brightness, Conrast, H-Pos, V-Pos, H. Size, Phase, Color Select,
Auto, Reset, Language, OSD Adjust, Exit
+-70 Degrees
+-70 Degrees
90-264 Vac 60 / 50 Hz
48W (max.)
15 Pin D Type
Analog R.G.B. , 0.7Vp-p / 75 Ohms
TTL level,positive or negative polarity
Cool / Warm
452mm x 465mm x 142mm
4.8Kg
0 / + 15 degree
＜ 50W
＜ 5W
＜ 5W
3.5Φ stereo phone jack
Input Sensitivity : 200mV
2.5+2.5W 8Ω Speaker
from PC for DDC
DD
C.TIMING CHART
Video A: Period
D B E B: Active
C: Sync Width
Sync. D: Back Porch
C A E: Front porch
Preset
Modes
VGA
640X480
*VGA
640X480
VESA
640X480
VESA
640X480
VGA
720X400
VESA
800X600
VESA
800X600
800X600
VESA
VESA
800X600
*MAC
832X624
Dot Rate
F.H
A-period 31.778us 28.590us 26.413us 26.667us 31.777us 28.444us 26.400us 20.800us 21.333us 20.364us
B-Active 25.422us 20.421us 20.317us 20.317us 25.422us 22.222us 20.000us 16.000us 16.162us 15.127us
C-Sync.width 3.813us 2.042us 1.270us 2.032us 3.813us 2.000us 3.200us 2.400us 1.616us 2.182us
D-Back
Porch
E-Front
Porch
F . V 59.941Hz 66.625Hz 72.810Hz 75.000Hz 70.087Hz 56.250Hz 60.317Hz 72.188Hz 75.000Hz 75.087Hz
A-Period 16.683ms 15.009ms 13.734ms 13.333ms 14.268ms 17.778ms 16.579ms 13.853ms 13.333ms 13.318ms
B-Active 15.253ms 13.723ms 12.678ms 12.800ms 12.711ms 17.067ms 15.840ms 12.480ms 12.800ms 12.707ms
C-Sync.width 0.064ms 0.086ms 0.079ms 0.080ms 0.064ms 0.057ms 0.106ms 0.125ms 0.064ms 0.061ms
D-Back
Porch
E-Front
Porch
H/V
SYNC
25.175MHz 31.340MHz 31.500MHz 31.500MHz 28.322MHz 36.000MHz 40.000MHz 50.000MHz 49.500MHz 55.000MHz
31.469KHz 34.978KHz 37.861KHz 37.500KHz 31.469KHz 35.156KHz 37.879KHz 48.077KHz 46.875KHz 49.107KHz
1.589us 3.063us 3.810us 3.810us 1.907us 3.556us 2.200us 1.280us 3.232us 1.745us
0.954us 3.064us 1.016us 0.508us 0.635us 0.666us 1us 1.12us 0.323us 1.31us
0.794ms 1.115ms 0.528ms 0.427ms 1.112ms 0.626ms 0.607ms 0.478ms 0.448ms 0.428ms
0.572ms 0.085ms 0.449ms 0.026ms 0.381ms 0.028ms 0.026ms 0.77ms 0.021ms 0.122ms
－ － － － － － － － － ＋ ＋ ＋ ＋ ＋ ＋ ＋ ＋ ＋ － －
Interlaced
NON NON NON NON NON NON NON NON NON NON
Preset
Modes
VESA
1024X768
VESA
1024X768
VESA
1024X768
VESA
1280X1024
VESA
1280X1024
Dot Rate
F.H
A-period 20.677us 17.707us 16.660us 15.630us 12.504us
B-Active 15.754us 13.653us 13.003us 11.852us 9.481us
C-Sync.width
th
D-Back
Porch
E-Front
Porch
F . V 60.004Hz 70.069Hz 75.029Hz 60.020Hz 75.025Hz
A-Period 16.666ms 14.272ms 13.328ms 16.661ms 13.329ms
B-Active 15.880ms 13.599ms 12.795ms 16.005ms 12.804ms
C-Sync.width 0.124ms 0.106ms 0.050ms 0.047ms 0.038ms
D-Back
Porch
E-Front
Porch
H/V
SYNC
65.000MHz
48.363KHz
2.092us 1.813us 1.219us 1.037us 1.067us
2.462us 1.920us 2.235us 2.296us 1.837us
0.369us 0.321us 0.203us 0.444us 0.119us
0.600ms 0.513ms 0.466ms 0.594ms 0.475ms
0.062ms 0.054ms 0.017ms 0.016ms 0.013ms
－ － － － ＋ ＋
75.000MH
z
56.476KH
z
78.750MHz 108.00MhZ 135.00MHz
60.023KHz 63.98KHz 79.976KHz
＋ ＋ ＋ ＋
Interlaced NON NON NON NON NON
D. CONTROL LOCATION
Font control panel
1. Power Button
2. 2. LED (Power Display)
3. Menu Button
4. Select Button
5. Auto Button
E. CONDUCTION VIEW
MAIN BOARD
(Com po
nent Side)
MAIN BOARD (Component Side)
MAIN BOARD (Solid Side)
ITEM
Program Menu.
B+
Check
A
Power Savin
Check
B
F. ADJUSTMENT PROCEDURE
﹟Test Meter
﹡Test Point
﹫Pattern
﹟Digital Voltmeter
﹡CN7
﹫Crosshatch Pattern
(31.5KHz,640x480)
g
﹟Wattmeter
﹟PC or Pattern
generator
﹫Crosshatch Pattern
(31.5KHz,640x480)
Operation
1. Plug power cable into the adapter, check adapter
power indicator light up green.
2. Make sure the voltage of the power plug (
on the main
1. Unplug the signal cable into the monitor.
2. Turn the power switch of the monitor
3. Check monitor power indicator light up orange.
4. Make sure the wattmeter value shown at right.
5.
will be display “
OSD
to the value shown at right.
PCB
NO SIGNAL
” Picture.
ON
CN7
.
)
Check
Value
12.0V
±0.2V
‹ 2.5W
Into Factory
mode
C
Auto mode
Check
D
White
Balance
Adjust
E
OSD
F
Language
Setting
﹟PC or Pattern
generator
﹫Crosshatch Pattern
(31.5KHz,640x480)
﹟PC or Pattern
generator
﹫Crosshatch Pattern
(1024x768/60Hz)
﹟
PC or Pattern
generator
﹫White Pattern
(1024x768/60Hz)
﹟
PC or Pattern
generator
1. Hold ‹ key,then turn the power switch of the
monitor
OFF
.
2. Hold › key,then turn the power switch of the
monitor
ON
.
3. You can into factory adjustment mode.
1. Press and relese the
menu.
OSD
2. Move the
OSD
to the
MENU
knob to activate the
function,press
AUTO
MENU
key auto adjuat display mode to its utmost
performance according to
VGA
setting.
3. In the event of the display image needs further
adjustment
1. Move the
2. set color is 9300
OSD
to the
K
using the
°
COLOR
(
mode
AUTO COLOR).
,Check the value
OSD
shown at right.
Y = 220±0.1FL x = 0.283±0.01 y = 0.297±0.01
3. set color is 6500
K
using the
°
,Check the value
OSD
shown at right.
Y = 220±0.1FL x = 0.313±0.01 y = 0.329±0.01
1. Move the
OSD
to the
LANGUAGE
mode
.
2. You can choose one of the eight language you need.
G. TROUBLE SHOOTING HINTS
NO NO
YES YES
No Display
( Black )
LED ON ?
Push the power
ON/OFF switch
Power
adapter ?
Change
adapter
LED Color
change ?
Back light
ON?
To Step 2
YES YES
NO NO
High Voltage !
NO
YES
YES
NO NO
YES
Check main
board U2/Pin2
Hi / Lo under
push power
sw?
A
To Step 2
Check the CN1/Pin1
of Inverter
+12V ?
Check
F1(Fuse) of inverter
Make sure the
connection of
Inverter is fine
Display ?
Nice Job !
B
NO
A
Check the
connection of
YES
YES
NO
YES
NO
CN8 cable
Display ?
Nice Job !
Change the
main board
B
Hi / Lo under
push power
sw?
Change the
Inverter
Display ?
Change the
main board
Nice Job !
To Step 2
Step 2
NO
YES
NO
YES
YES
Check the main
board 12V ?
+5.0 V ?
U10,U11,TR1
Check the main
board U7 / Pin 5 ?
YES
Check
F1,D5
Check
Check
U7
NO
H/V input
Signal ?
Check
YES
H/V Signal
NO
YES
Display ?
Nice Job !
Change
U9
Change
Signal Cable
No display
(White)
NO
YES
NO
Check the main
board 5V ?
U10,U11,TR1
+3.3V ?
YES
NO
Check the main
YES
YES
board
U9/Pin3 ?
H/V Input
Signal ?
3.3V Circuit
Check
Check
U8,U13
Check
Change
U9
NO
Check
H/V Signal
NO
YES
Display ?
Nice Job !
.
Change
Signal Cable
H. BLOCK DIAGRAM
VSYNC
HSYNC
VGA-IN
12PIN
C
O
N
N
E
N
DDC-SDA
T
DDC-SCL
D.D.C
24C21
EEPROM
24C16
EEPROM
POWER
SWITCH POWER
SUPPLY AND
REGULATOR
12V
POWER
ADAPTER
3 {R.G.B}
12V
3V
5V
ADC
SDA
SCL
8 R0~R7
8 G0~G7
8 B0~B7
CRYSTAL
12M HZ
CRYSTAL
12M HZ
SCALER
MCU
8 RA0~RA7
8 GA0~GA7
8 BA0~BA7
8 RB0~RB7
8 GB0~GB7
8 BB0~BB7
8PIN
FUNCTION KEY
LVDS
LVDS
C
O
N
N
E
N
T
10 EVEN
10 ODD
BLK-ON/OFF
BRIGHTNESS
LCD PANEL(LVDS)
D-DE
INVERTER
12V
HI VOLTAGE
Title
BLOCK DIAGRAM
Size Document Number
B
ORION
Tuesday, October 23, 2001
Date: Sheet
Rev
11
B
of
I.SCHEMATIC DIAGRA
.
Memu.
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