Tovis MTG-1902MM Manuel utilisateur
TOVIS P/N MTG-1902MM DATE 05/11/02
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Color Monitor Service Manual
MODEL: MTG – 1902MM
TOVIS CO., LTD.
TOVIS P/N MTG-1902MM DATE 2002.05.11
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TOVIS Color Monitor Service Manual
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INDEX
1. SAFETY PRECAUTIONS-------------------------------- 3
2. SPECIFICATIONS----------------------------------------- 4
3.TECHNICAL FEATURES ------------------------------- 5
4. TIMING CHART ------------------------------------------- 6
5. SET UP ------------------------------------------------------ 9
6.CONTROLS AND ADJUSTMENTS ------------------10
7. ADJUSTMENT SPECIFICATIONS------------------- 15
8. DESCRIPTION OF CIRCUIT OPERATION ------- 18
9.TROUBLE SHOOTING --------------------------------- 22
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1. SAFETY PRECAUTIONS
WARNING: Service should not be attempted by anyone unfamiliar with the
necessary precautions on this unit. The following precautions are
necessary during servicing.
1-1. Some parts in this unit, such as the picture tube, have special safety-related
characteristics for X-RAY RADIATION protection. For continued safety, parts
replacement should be undertaken by referring to articles (1-2 ∼1-5).
1-2. Many electrical/mechanical parts in this unit have special safety-related
characteristics for protection against electrical shock and other potential
hazards. These characteristics often go unnoticed by a visual inspection and
the protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement
parts, which have these special characteristics, are identified in the manual
and highlighted on the schematic diagram and parts list. Before replacing
these components read the parts list carefully.
1-3. When replacing chassis in the cabinet, always be certain that all the
protective devices are installed properly, such as insulating covers, strain relief,
etc.
1-4. Before replacing the back cover of the set, thoroughly inspect inside the
cabinet to see that no stray parts or tools have been left inside.
1-5 Before returning the set to the customer always perform an ac current leakage
check on the exposed metallic parts of the cabinet, such as terminal, screw
heads, metal overlays, control shafts, etc. To be sure the set is safe to operate
without danger of electrical shock, plug the AC power cable directly into a 115V
AC outlet. (do not use a line isolation transformer during this check). Use an
AC volt- meter with 5000 or more ohms per volt in the following manner. You
cannot use a 1500 ohm, 10watt resistor, paralleled by a 0.15(uF) capacitor.
Reverse the AC plug, the AC outlet and repeat the AC voltage measurements
for each exposed metallic part. Voltage measured must not exceed 0.3V RMS.
This corresponds to 0.2mA AC. Any value exceeding this limit constitutes a
potential shock hazard and must be corrected immediately.
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2. SPECIFICATIONS
2-1. Picture Tube
∙Size : 19"
∙Dot Pitch : 0.26mm
2-2. Signal Input
∙Video Input : Analog, Positive Signal(0.7Vp-p)
∙Horizontal Sync : TTL Level, Positive or Negative pulse.
∙Scanning : 28Khz ∼70KHz
∙Vertical Input : TTL Level, Positive or Negative pulse.
∙Scanning : 40∼160Hz
2-3. Power Supply
∙Power Input : AC100∼240V, 50/60Hz
∙Fuse Rating : 250V, 50T 3.15A
∙Power Consumption
Normal : less than 85W
DPMS : less than 20W
2-4. External Control :
Refer to page 7.
2-5. Operating Temperature : 0℃∼ 55℃
2-6. Operating Humidity : 10%∼90%(Non-condensing)
2-7. Net weight : 17kg
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3. TECHNICAL FEATURES
3-1. U-com(MCU) control with OSD.
U-com recognizes the computer signal and signal output from control board
connected with wire. So the circuit is simplified.
3-2. Universal AC input voltage.
Power supply operates on AC100∼265volt 50/60Hz for use all over the
world.
3-3. Protection Circuit for over-current.
When over-current occurs in the circuit, the protection circuit operates in
order to prevent the components from electrical shock or other risks.
3-4. Override function
The override function is designed for the normal display when the monitor is
powered on without connection from the source (No signal message).
3-5. Control panel
If you are not satisfied with the factory mode size, position, color settings,
use the control panel to program what you prefer in each resolution mode.
These adjusted settings are kept in memory even if you change resolution
mode or turn off the monitor.
3-6. I2C BUS control
It is designed by I2C BUS control for simplifying circuit.
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4. TIMING CHART
Factory Pre-Set Timing Modes:
D
VIDEO
SYNC C E
A B
DESCRIPTION MODE 1
VGA 720*400
MODE 2
VGA 640*480
MODE 3
8514/A 1024*768
MODE 4
S-VGA 680*400
FH 31.469KHz 31.469KHz 35.552KHz 37.500KHz
A 31.778㎲ 31.778㎲ 28.251㎲ 26.667㎲
B 3.813㎲ 3.813㎲ 3.920㎲ 2.032㎲
C 1.907㎲ 1.589㎲ 1.247㎲ 3.810㎲
D 25.422㎲ 25.422㎲ 22.806㎲ 20.317㎲
E 0.636㎲ 0.318㎲ 0.170㎲ 0.508㎲
H
POL. NEGATIVE NEGATIVE POSITIVE NEGATIVE
FH 70.087Hz 59.940Hz 86.960KHz 75.000Hz
A 14.268ms 16.683ms 11.500ms 13.333ms
B 0.064ms 0.064ms 0.113ms 0.080ms
C 1.112ms 0.794ms 0.563ms 0.427ms
D 12.711ms 15.253ms 10.810ms 12.800ms
E 0.381ms 0.064ms 0.014ms 0.027ms
V
POL. POSITIVE NEGATIVE POSITIVE NEGATIVE
VIDEO ANALOG ANALOG ANALOG ANALOG
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DESCRIPTION MODE5 S-VGA
VESA 800*600
MODE6
VGA 800*600
MODE 7 VGA
VESA 800*600
MODE 8
VESA 1024*768
FH 37.879KHz 46.875KHz 48.077KHz 48.363KHz
A 26.400㎲ 21.333㎲ 20.800㎲ 20.677㎲
B 3.200㎲ 1.616㎲ 2.400㎲ 2.231㎲
C 2.200㎲ 3.232㎲ 1.280㎲ 1.615㎲
D 20.000㎲ 16.162㎲ 16.000㎲ 15.754㎲
E 1.000㎲ 0.323㎲ 1.119㎲ 0.998㎲
H
POL. POSITIVE POSITIVE POSITIVE NEGATIVE
FV 60.317Hz 75.000Hz 72.188Hz 60.004Hz
A 16.579ms 13.333ms 13.853ms 16.666ms
B 0.106ms 0.064ms 0.125ms 0.124ms
C 0.607ms 0.448ms 0.478ms 0.600ms
D 15.840ms 12.800ms 12.480ms 15.880ms
E 0.026ms 0.021ms 0.772ms 0.062ms
V
POL. POSITIVE POSITIVE POSITIVE NEGATIVE
VIDEO ANALOG ANALOG ANALOG ANALOG
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DESCRIPTION
MODE 9
VESA
800*600
MODE 10
VESA
1024*768
MODE 11
VESA
1024*768
MODE 12
VESA
1280*1024
MODE 13
VESA
1024*768
FH 53.674KHz 56.476KHz 60.023KHz 63.981KHz 68.677KHz
A 18.631㎲ 17.707㎲ 16.660㎲ 15.698㎲ 14.561㎲
B 1.138㎲ 1.813㎲ 1.219㎲ 1.037㎲ 1.016㎲
C 2.702㎲ 1.920㎲ 2.235㎲ 2.296㎲ 2.201㎲
D 14.222㎲ 13.653㎲ 13.003㎲ 11.852㎲ 10.836㎲
E 0.569㎲ 0.321㎲ 0.203㎲ 0.360㎲ 0.508㎲
H
POL. POSITIVE NEGATIVE POSITIVE POSITIVE POSITIVE
FV 85.062Hz 70.069Hz 75.029Hz 60.020Hz 84.997Hz
A 11.756ms 14.272ms 13.328ms 16.638ms 11.765ms
B 0.056ms 0.106ms 0.050ms 0.047ms 0.044ms
C 0.503ms 0.513ms 0.466ms 0.594ms 0.524ms
D 11.179ms 13.599ms 12.795ms 16.005ms 11.183ms
E 0.019ms 0.054ms 0.017ms 0.016ms 0.015ms
V
POL. POSITIVE NEGATIVE POSITIVE POSITIVE POSITIVE
VIDEO ANALOG ANALOG ANALOG ANALOG ANALOG
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5. SET UP
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5-1. Start Up
Your monitor starts up automatically when you insert the power plug to power
source.
AMP 25PIN MICROTOUCH
MICROTOUCH DRAWER CONN.
CONTROLLER SENSOR GLASS
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6. CONTROLS AND ADJUSTMENTS
There are four switches on the control panel.
Adjustable controls allow the best display status for individual preferences.
6-1. Key Function
①MODE
MODE - Call the Main-Menu OSD.
②SEL/DEGAUSS
SEL – Select the function (sub-Menu OSD) on the Main- Menu OSD.
DEGAUSS – Do degaussing if the OSD isn’t displayed.
③DOWN/UP
-When the Main-Menu is displayed, you can search each function using
these
keys.
-When the Sub-Menu is displayed(after select the function), can change
each state of the screen using these keys.
O.S.D Control
Sub-P.C.B
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