Proview SH770I LCD Service Manual.pdf
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Microsoft Word - SH770I Service Manual.doc
SH770I
Service Manual
TABLE OF CONTENTS
SERVICEWARNING
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1
A.
IMPORTANT SAFETY INSTRUCTION
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1
B.
SPECIFICATIONS
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2
C.
TIMING CHART
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3
D.
CONTROL LOCATION
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5
E.
CONDUCTION VIEW
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F.
ADJUSTMENT PROCEDURE
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11
G.
TROUBLE SHOOTING HINTS
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H.
BLOCK DIAGRAM
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I.
SCHEMATIC DIAGRAM
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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
branch office if you need help.
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.
f.
If the product exhibits a distinct change in performance,indicating a need for service.
B. SPECIFICATIONS
1.
Maximum Resolution
1280*1024 @ 75Hz
2.
Recommend Resolution
1280*1024 @ 60Hz
3.
Synchronization Range
Horizontal
Vertical
30 – 81 KHz
56– 76 Hz
4.
Active Display Area
376.32mm (H) x 301.056mm (V)
5.
Dot Pitch
0.294(H) x 0.294(V) mm
6.
Support display colors
16.7M color
7.
Contrast Ratio (Typical)
600:1
8.
Luminance of White
260cd/m²
9.
Bandwidth
135MHz
10.
User Control
4 Key Switch
11.
OSD Function
Brightness, Conrast, H-Pos, V-Pos, H. Size, Phase, Color Select,
Auto, Reset, Language, OSD Adjust, Exit
12.
View Angle CR=5
Horizontal
Vertical
+-85 Degrees
+-85 Degrees
13.
Power Source
90-264 Vac 60 / 50 Hz
14.
Power Consumption
48W (max.)
15.
Connection Type
15 Pin D Type
16.
Input Signal
Video
Sync.
Analog R.G.B. , 0.7Vp-p / 75 Ohms
TTL level,positive or negative polarity
17.
Color Temperature
Cool / Warm
18.
Dimension (WxHxD)
459mm x 407mm x 165mm
19.
Monitor Weight
8.2Kg
20.
Base Operation
Tilt
0 / + 15 degree
21.
Power Saving
ON
STAND BY
OFF
＜
50W
＜
5W
＜
5W
22.
Signal Connector Pin Assignment
Pin No.
1. Red 9. V
DD
from PC for DDC
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
23.
Audio signal
3.5Φ stereo phone jack
Input Sensitivity : 200mV
2.5+2.5W 8Ω Speaker
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
VESA
800X600
VESA
800X600
*MAC
832X624
Dot Rate
25.175MHz 31.340MHz 31.500MHz 31.500MHz 28.322MHz 36.000MHz 40.000MHz 50.000MHz 49.500MHz 55.000MHz
F.H
31.469KHz 34.978KHz 37.861KHz 37.500KHz 31.469KHz 35.156KHz 37.879KHz 48.077KHz 46.875KHz 49.107KHz
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
1.589us 3.063us 3.810us 3.810us 1.907us 3.556us 2.200us 1.280us 3.232us 1.745us
E-Front
Porch
0.954us 3.064us 1.016us 0.508us 0.635us 0.666us 1us 1.12us 0.323us 1.31us
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
0.794ms 1.115ms 0.528ms 0.427ms 1.112ms 0.626ms 0.607ms 0.478ms 0.448ms 0.428ms
E-Front
Porch
0.572ms 0.085ms 0.449ms 0.026ms 0.381ms 0.028ms 0.026ms 0.77ms 0.021ms 0.122ms
H/V
SYNC
－ － － － － － － － － ＋ ＋ ＋ ＋ ＋ ＋ ＋ ＋ ＋ － －
Interlaced
NON NON NON NON NON NON NON NON NON NON
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