Ctx S720 SERVICE MANUAL

SERVICE MANUAL

S720

The Monitor Specialists

EDITION 1 Jul.. 2003

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Service Manual

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

S720

8. Pin Assignment 17~25

9. Parts List 26

Appendix

1. Main Board Circuit Diagram

2. Assembly Explosion Drawing

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Service Manual

S720

The CTX SERVICE MANUAL is published by Chuntex Electronic Co., Ltd

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.

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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

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Function keys * 5 : Power On/Off, ESC, △ (up), ▽ (down), (enter)

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Direct Acess function keys : △ for

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

contrast function, ▽ for brightness function

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S720

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Service Manual

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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

2.2 Display Input

2.2.1. RGB Video

2.2.2 Sync Signal

2.2.3 Analog Input Connection

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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.

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

3. ELECTRICAL CHARACTERISTICS

3.1 LCD Panel

3.1.1. Type

3.1.2. Pixel structure

3.1.3. Gray scale

3.1.4. Surface treatment 3H hard coating ,anti-static

3.1.5. Backlight

3.1.6 Pixel Faults

Pixel Faults type

17” diagonal, SXGA resolution, color TFT-LCD

R/G/B sub-pixels in vertical stripes

1280 x 1024 array matrix

A-Si TFT active matrix

16 million Colors.

Integral CCFT ,

Type to support field replacement.

Life time 30000 hours @ 25C, 50% of initial value.

Model

Project

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

S720

LIS17S24KA

Type1 Bright Pixels (Note 1)

Type2 Dark Pixels (Note 2)

Type3 Fault Pixels / Sub-Pixels(Note 3)

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≦ 5

≦ 3

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Type4 Cluster of type1 or type 2 faults(Note 4)

Type5 Cluster of type3 faults (Note4)

Type6 Total Pixel Faults

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.

≦ 2

≦ 3

≦ 8

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3.2 Modes and Timing Compability

The monitor shall support all the modes listed in Table 1.

Display Format IBM VGA VESA VESA VESA VESA VESA Horizontal Dots 720 640 640 640 800 800 800 Vertical lines 400 480 480 480 600 600 600 Horizontal Frequency 31.469 37.861 37.5 37.879 48.077 46.875 Vertical Frequency 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. Sync. Polarit

V. Sync. Polarit 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

Display Format VESA VESAVESA VES Horizontal Dots 1024 1024 1024 1152 1280 1280 Vertical lines 768 768 768 864 1024 1024 Horizontal Frequency 48.363 56.746 60.023 67.5 63.981 79.976 Vertical Frequency 60.004 70.069 75.029 75 60.013 75.025 Pixel Rate ( MHz ) 65.0 75 78.75 108 108 135 H. Sync. Polarit

V. Sync. Polarit 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

20.667 17.707 16.660 14.815 15.631 12.504

2.092 1.813 1.219 1.185 1.180 1.067

2.462 1.920 2.235 2.370 2.065 1.837

15.754 13.653 13.003 10.667 11.797 9.481

0.369 0.321 0.203 0.593 0.590 0.119

Table 1. Supported Timing

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31.778 26.413 26.667 26.4 20.8 21.333

3.813 1.270 2.032 3.2 2.4 1.616

1.907 4.063 3.810 2.2 1.28 3.232

25.422 20.317 20.317 20.0 16.0 16.162

0.636 0.763 0.508 1.00 1.12 0.323

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VESA VESA

S720

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VGA Support Mode

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

Timing Chart

Figure. 1 Timing Chart

Video

H Sync.

B C D E

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