Tovis MTG-1905XT, MTG-2105XN, MTG-1905XN, MTG-2105XT Service And Operation Manual

MTG-XX05XT/XN Publication A. Issue 1

SERVICE AND OPERATION MANUAL

MTG-1905XT/XN : 19INCH, FST
MTG-2105XT/XN : 21INCH, FST

Information in this publication current as of Jun, 2003.

Information subject to change as display technology advance.

This publication produced by TOVIS Engineering Division.

This monitor has been designed and manufactured to deliver high performance video. For continued peak Performance
use safe operation, only high quality TOVIS replacement parts or their exact specified Equivalent When servicing.

MTG- XX05XT/XN

OPEN FRAME XGA COLOR MONITORS

2

SAFETY PRECAUTIONS AND WARNINGS

Service Warning

This display contains HIGH VOLTAGE capable
of delivering LETHAL quantities of energy.
Service should only be attempted by trained
personnel familiar with the potential dangers
inherent with voltage equipment.

Safety Related Component Warning

Certain components used in TOVIS color
monitors are critical for safe operation of the
display. These parts Number are marked by
( ) in the parts list and on the schematic
diagram it is essential that these Safety critical
components be replaced only with exactly
specified components to prevent the
Possibility of excessive X-radiation emission,
electrical shock, fire, or premature
component failure.
Modifying the original design without written
approval from TOVIS is expressly forbidden, will
void the original Parts and labor warranty, and
may result in creating a hazardous situation.

X-RADIATION WARNING

COMPONENTS WHICH MAY AFFECT POTENTIAL
EXCESS EMISSION OF X-RADIATION IN THE
HORIZONTAL DEFLECTION AND HIGH VOLTAGE
CIRCUITS (INCLUDING THE PICTURE TUBE) ARE
TO BE USE ONLY TYPE AND RATING OF
REPLACEMENT COMPONENT AS SHOWN IN THE
PARTS LIST.

1. The only potential source of X-radiation
emission is the picture tube. When the high
voltage and horizontal deflection circuits are
operating correctly there is no possibility of
excess X- radiation emission. NEVER attempt
to modify these circuits.

2. Periodically check the high voltage with a
reliably calibrated meter for values not in
excess of Manufacturer’s recommendations.
See high voltage Shut-down Circuit, page 4,
for further details.

CRT Warning

All picture tubes used in TOVIS monitors are
equipped with an integral implosion protection
system.
The picture Tube is, however, a highly evacuated
component whose outside surfaces are subject to
strong external forces. Care must be exercised so
as not to bump or scratch the tube during
installation or servicing as this may cause the tube
to implode resulting in possible personal injury and
property damage. Shatter-proof goggles must be
worn by Individuals while handling the CRT or
installing the display in the cabinet. Do not handle
The CRT by the neck.

1. Always ensure the high voltage at the anode cap
is fully discharged prior to handling or service.

2. Replace picture tube only with same type and
number.

Product Safety and Service Guidelines

1. Service should be performed only after reading all
of the warnings and precautions in this manual
and as Labeled on the CRT and chassis.

2. Where a short circuit has occurred, replace all
components that indicate evidence of
overheating or poor Connection on all plastic
connectors.

3. Inspect wiring for frayed leads and damaged
insulation when service is required, observe original
lead Dress is followed as from the factory,
especially in the high voltage circuitry area.

4. All protective devices must be reinstalled per
original design.

3

PERFORMANCE AND OPERATING DATA

1. Power Supply

*Power Input: 100VAC ~ 240VAC, 50/60Hz
*Fuse Rating: 250V, 50T 3.15A
*Power Consumption:

Size 19” 21”

W(Max) 130 130

2. Signal Input

*Video Input: Analog, Positive Signal (0.7V p-p)
*Horizontal Sync: TTL Level, Positive or Negative Pulse
*Horizontal Scan: 28KHz ~ 70KHz
(Horizontal Scan: 28KHz ~ 55KHz only 21”)
*Vertical Input: TTL Level, Positive or Negative Pulse
*Vertical Scan: 40Hz ~ 160Hz
*Resolution-Mode

Hf Vf Resolution H Range V range

31KHz 70Hz 720x400 28 ~ 32.9 68 ~ 72

31KHz 60Hz 640x480 28 ~ 32.9 58 ~ 62

35KHz 86Hz 1024x768 33 ~ 35.9 84 ~ 88

38KHz 75Hz 640x480 36 ~ 40.9 73 ~ 77

38KHz 60Hz 800x600 36 ~ 40.9 58 ~ 62

47KHz 75Hz 800x600 41 ~ 51.9 73 ~ 77

48KHz 72Hz 800x600 41 ~ 51.9 70 ~ 74

48KHz 60Hz 1024x768 41 ~ 51.9 58 ~ 62

53KHz 85Hz 800x600 52 ~ 61.9 83 ~ 87

56KHz 70Hz 1024x768 52 ~ 61.9 68 ~ 72

60KHz 75Hz 1024x768 52 ~ 61.9 73 ~ 77

64KHz 60Hz 1280x1024 62 ~ 70 58 ~ 62

68KHz 85Hz 1024x768 62 ~ 70 83 ~ 87

3. Picture Tube

The Cathode Ray Tube shall be a SAMSUNG Normal
& Dyna-Flat or equivalent

Size Dot Pitch Phosphor P/N

19 FST 0.26mm P22 M46QCE261X

21 FST 0.25mm P22 M51QBN291X

4. Pincushion

- 5% Maximum (All Brightness)

5. MTBF

- 20,000 Hours Minimum

6. Leakage Current

To chassis ground, at 220VAC, 50Hz (Line/Neutral in
common)

- 0.195mA Maximum

7. High Pot

Line/Neutral in common to secondary/chassis,

1500VAC 60Hz for 1 second

- 2.0mA Maximum, No Breakdown

8. Implosion Protection

- Provided by band and mounting lugs

9. Magnetic Shielding

- Internal

10. X-Radiation

- 0.50mR/hr Maximum

11. Mis-convergence

- Center : 0.30mm Maximum

- Corners : 0.45mm Maximum

12. Non-Linearity

Using a vertical and horizontal symmetrical cross
hatch pattern to equation for non-linearity will be
Non-linearity (%) = ((largest grid minus the smallest

grid) Divided by (largest grid plus
the smallest grid)) times 100.

- Standard Mode : 5% maximum

- Other Modes : 10% maximum

13. Temperature

- Operating: 0° ~ 50°C

- Storage: -10°C ~ 75°C

- Humidity: 10% ~ 90%(Non-condensing)

14. Power Save Mode

Shall be initiated by holding the Vertical Sync input
Low (0.5V) and shall reduce the power to less than
20 Watts.

15. Degaussing

Automatic at power-up and software via control
Switch “SEL”

16. Regulation (Static)

The horizontal and vertical size will change less than
2mm for a 25% white level abrupt luminance change.

4

PERFORMANCE AND OPERATING DATA

17. Display Stability for Temperature

The temperature is cycled from 25°C to 0°C, and
from 25°C to 50°C the video size and centering drift
will not exceed 5mm horizontally or 4mm vertically.
(Measured after a 20 min. warm-up period at 25°C)

18. Monitor Test Specifications

Parameter Size Normal Tolerance

H/V

(0uA Beam Current)

19 FST
21 FST

27.0KV

27.0KV

+/- 500V

G2

19 FST
21 FST

600V
600V

+/- 10V

Brightness

19 FST
21 FST

0.50FL

0.50FL

+/- 0.3FL

Contrast

(10% Window Box)

19 FST
21 FST

60.0FL

50.0FL

+/- 5FL

White Balance(9300)

X: 0.281
Y: 0.311

+/- 0.015
+/- 0.015

White Balance(6500)

X: 0.313
Y: 0.329

+/- 0.015
+/- 0.015

*Test Mode: VGA 640 x 480(Fh: 31KHz, Fv: 60Hz)
*Signal: BSG-170 (BARO)

20. WARRANTY

Manufacturer warranty 2 years parts and labor.

(Except on C.R.T)