CTX S720 User manual

S720
SERVICE MANUAL
The Monitor S
p
ecialists EDITION 1
Jul.. 2003

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TABLE OF CONTENTS
CONTENTS PAGE
Sections
1. Scope 3
2. Input requirements 4
3. Electrical Characteristics 5
4. Trouble Shooting 10~11
5. System Block Diagram 12
6. Inverter Board I/O Connection 13
7. IC Pin Configuration 14~16
8. Pin Assignment 17~25
9. Parts List 26
Appendix
1. Main Board Circuit Diagram
2. Assembly Explosion Drawing

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Copyright © 2002 by Chuntex Electronic Co., Ltd.
The CTX SERVICE MANUAL is published by Chuntex Electronic Co., Ltd
All rights reserved. No part of this manual may be used, copied, reproduced, or transmitted in any form or by
any means for any purpose without the express written permission of the publisher.
The publisher has been trying its best to make this publication perfect, and in this manner takes no
responsibility for the use of any of the materials or methods described in this manual, or for the products
thereof. Neither will the publisher be responsible for any damages caused by misuse or misquotation.
Information in this manual is subject to change by the publisher without any notice in advance.
CTX is a registered trademark of Chuntex Electronic Co., Ltd.

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1. SCOPE
This specification defines the design and performance requirements for the 17”
SXGA TFT LCD display monitor.“S720 “
There are 2 series of “ S720 ” in each own’s project code.
The common features of the 2 series of “S720 ” are listed in the following table :
Feature Description
1 Universal input AC/DC power supply inside the monitor
2 Analog RGB interface (VGA ) 30~80KHz, 59~75Hz, 135MHz
3 17” SXGA 1280*1024, TFT LCD panel
4 Function keys * 5 : Power On/Off, ESC, △ (up), ▽ (down), (enter)
5 Direct Acess function keys : △ for contrast function, ▽ for brightness function
6 Green/Amber LED indicator for power on/power saving
7 Plug & play support with DDC2B protocol installed.
8 Power saving mode compliant with Energy Star
9 OSD (on screen display) MENU operation
9.1 Brightness adjustment
9.2 Contrast adjustment
9.3 Auto tune function (VGA)
9.4 Color selection
9.5 Image adjustment
9.6 Position adjustment
9.7 Language selection
9.8 Reset function

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2. INPUT REQUIREMENTS
2.1 Input Power
2.1.1. Power Source
2.1.2. Power Consumption
2.1.3. AC Line Drop Out
2.1.4. AC Wave Distortion
2.1.5. In-rush Current
2.1.6. Power Cord
100 ~ 240 Vac, + -10%, 50/60 Hz
Normal operating mode : ≦ 35W
Power saving mode : ≦ 2W
Power switch off : ≦ 1.5W
Picture must not disappear while AC 100 V input drop out
(10ms, 100%)
10% max. permitted
50 A max at 240 Vac cold start
Detachable, 3P with ground type.
2.2 Display Input
2.2.1. RGB Video
2.2.2 Sync Signal
2.2.3 Analog Input Connection
Analogue, 0.0 to 0.7 V peak to peak
Separate RGB
Input impedance 75 Ohm
Positive polarity
1.Separate horizontal & vertical sync (3.3V & 5V)
Low level 0.8 V maximum
High level 2.0 V minimum
Positive or negative polarity
a. Captive cable(length1.5M) in LCD monitor end, Mini
D-sub 15 pin male in another end.
b.Cable oin assignment

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Pin 1 Red
Pin 2 Green
Pin 3 Blue
Pin 4 No Connection
Pin 5 Ground
Pin 6 R Return
Pin 7 G Return
Pin 8 B Return
Pin 9 DDC +5V
Pin 10 Ground
Pin 11 Ground
Pin 12 SDA
Pin 13 H. Sync &
Composite sync
Pin 14 V. Sync
Pin 15 SCL
3. ELECTRICAL CHARACTERISTICS
3.1 LCD Panel
3.1.1. Type 17” diagonal, SXGA resolution, color TFT-LCD
3.1.2. Pixel structure R/G/B sub-pixels in vertical stripes
1280 x 1024 array matrix
A-Si TFT active matrix
3.1.3. Gray scale 16 million Colors.
3.1.4. Surface treatment 3H hard coating ,anti-static
3.1.5. Backlight Integral CCFT ,
Type to support field replacement.
Life time 30000 hours @ 25C, 50% of initial value.
3.1.6 Pixel Faults
Model
Project
Pixel Faults type
S720
LIS17S24KA
Type1 Bright Pixels (Note 1) ≦5
Type2 Dark Pixels (Note 2) ≦5
Type3 Fault Pixels / Sub-Pixels(Note 3) ≦3

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Type4 Cluster of type1 or type 2 faults(Note 4) ≦2
Type5 Cluster of type3 faults (Note4) ≦3
Type6 Total Pixel Faults ≦8
Note 1 : Bright pixels in full black pattern.
Note 2 : Dark pixels in full white pattern
Note 3 : fault Pixel / Sub-Pixel : The pixel or sub-pixel is abnormal but not bright/dark pixel.
Note 4 : Fault Cluster : Two or more Pixels/Sub-pixels with faults within 5 * 5 block of pixels.

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3.2 Modes and Timing Compability
The monitor shall support all the modes listed in Table 1.
Table 1. Supported Timing
Dis
p
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y
Format IBM VGA VESA VESA VES
A
VESA VESA
Horizontal Dots 720 640 640 640 800 800 800
Vertical lines 400 480 480 480 600 600 600
Horizontal Fre
q
uenc
y
31.469 37.861 37.5 37.879 48.077 46.875
Vertical Fre
q
uenc
y
70 59.94 72.809 75 60.317 72.188 75.000
Pixel Rate
(
MHz
)
28.322 25.175 31.5 31.5 40 50 49.5
H. S
y
nc. Polarit
y
- - - - + + +
A
μ
S
(Period)
31.778 26.413 26.667 26.4 20.8 21.333
B
μ
S
(PulseWidth)
3.813 1.270 2.032 3.2 2.4 1.616
C
μ
S
( Back Porch )
1.907 4.063 3.810 2.2 1.28 3.232
D
μ
S
(ActiveArea)
25.422 20.317 20.317 20.0 16.0 16.162
E
μ
S
(Front Porch )
0.636 0.763 0.508 1.00 1.12 0.323
V. S
y
nc. Polarit
y
+ - - - + + +
O ms
(
Period
)
16.683 13.735 13.333 16.579 13.853 13.333
P ms
(
Pulse Width
)
0.064 0.079 0.080 0.106 0.125 0.064
Q ms
(
Back Porch
)
1.048 0.739 0.427 0.607 0.478 0.448
R ms
(
Active Area
)
12.711 15.253 12.678 12.800 15.840 12.480 12.8
S ms
(
Front Porch
)
0.318 0.237 0.027 0.026 0.770 0.021
Dis
p
la
y
Format VESA VES
A
VESA VES
A
VESA VESA
Horizontal Dots 1024 1024 1024 1152 1280 1280
Vertical lines 768 768 768 864 1024 1024
Horizontal Fre
q
uenc
y
48.363 56.746 60.023 67.5 63.981 79.976
Vertical Fre
q
uenc
y
60.004 70.069 75.029 75 60.013 75.025
Pixel Rate
(
MHz
)
65.0 75 78.75 108 108 135
H. S
y
nc. Polarit
y
- - + + + +
A
μ
S
(Period)
20.667 17.707 16.660 14.815 15.631 12.504
B
μ
S
(PulseWidth)
2.092 1.813 1.219 1.185 1.180 1.067
C
μ
S
( Back Porch )
2.462 1.920 2.235 2.370 2.065 1.837
D
μ
S
(ActiveArea)
15.754 13.653 13.003 10.667 11.797 9.481
E
μ
S
(Front Porch )
0.369 0.321 0.203 0.593 0.590 0.119
V. S
y
nc. Polarit
y
- - + + + +
O ms
(
Period
)
16.666 14.272 13.238 13.333 16.663 13.329
P ms
(
Pulse Width
)
0.124 0.106 0.050 0.044 0.047 0.038
Q ms
(
Back Porch
)
0.6 0.513 0.466 0.474 0.594 0.475
R ms
(
Active Area
)
15.88 13.599 12.795 12.8 16.006 12.804
S ms
(
Front Porch
)
0.062 0.054 0.017 0.015 0.016 0.012

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Figure. 1 Timing Chart
Video
H Sync.
B C D E
A
Video
VGA Support Mode
Timing Chart
1280 * 1024 @ 60Hz,70Hz
1280 * 1024 @ 72Hz,75Hz
1280 * 960 @ 60Hz,70Hz,72Hz,75Hz
1208 * 720 @ 60Hz
1152 * 864 @ 60Hz, 70Hz,72Hz
1024 * 768 @ 72Hz
800 * 600 @ 70Hz
640 * 480 @ 70Hz
640 * 350 @ 70Hz

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3.3 Plug & Play DDC 2B data transmission only for I2C BUS interface card.
3.4 Scanning characteristics
Horizontal frequency 30KHz to 80KHz
Refresh rate 59Hz to 75Hz
3.5 User Controls and Indicator
3.5.1 Power ON/OFF Switch
3.5.2 LED Indicator
3.5.3 OSD
3.5.3.1 Buttons
3.5.3.2 OSD Menu Level
3.5.4 Hot Keys Function
3.5.4.1 Contrast ( )
3.5.4.2 Brightness ( )
3.5.4.3 Key lock function
The switch control scaler power down and turn off panel.
The LED color shall indicate power status as shown in paragraph
3.6
ESC ,▽, △,
See Table 2. S720 OSD Control Map
Fast reset : Press” “ ”△“ and turn on the power.
Burn in : Press “▽” “ESC” and turn on the power.
Press “△” to pop up ;then press “△” or “▽” to adjust Contrast up or
down.
Press “▽” to pop up ;then press “△” or “▽” to adjust Brightness up
or down.
Push “ “ for 10 sec while the screen has not any OSD showing
Then setup “Key lock” function enable or disable.
S720 OSD Control Map
VGA-D15 input
Level 1 Level 2 Level 3 Level 4
Detect Ad
j
. Bri
g
htness
Detect Ad
j
. Contrast
A
uto Tune
A
d
j
ustment Scale
9300∘ K
6500∘ K
Color
User R/G/B select
A
d
j
ustment Scale