PRICE-PERFORMANCE 17 LCD: SPEAKERS, STYLE AND HIGH SPECIFICATIONS
The S762A is the latest in high quality, well-priced products from CTX. This 17 LCD is finished in silver and black to match the most modern, style-conscious, PCs and peripherals. It perfectly balances high quality, cost-effective components to produce a screen that will deliver the results you need, at a price you like. The S762A has a contrast ratio of 450:1 and brightness of 260 cd/m2, ensuring the best possible picture for you. This is combined with a stylishly designed casing; 160 viewing angles, both vertically and horizontally; 25 ms response time and built-in stereo speakers. The S762A is compatible with VESA wall-mounting standards and TCO99 and ISO13406-2 certified.
Silver-Black 17" Type TN-TFT Resolution 1280x1024 (SXGA) Colours 16 million colours Pixel Pitch 0.264 mm Contrast Ratio 450:1 (Typical) Brightness 260 cd/m2 (Typical) Horizontal Viewing Angle 160 Vertical Viewing Angle 160 Response Time 25 ms (Typical) Horizontal Scan 30kHz ~ 80kHz Vertical Refresh 59Hz ~ 75Hz Modes and Timing Compatibility 640x350 @ 70Hz 720x400 @ 70Hz 640x480 @ 60Hz 640x480 @ 70Hz, 72Hz, 75Hz 800x600 @ 60Hz, 70Hz, 72Hz, 75Hz 1024x768 @ 60Hz, 70Hz, 72Hz, 75Hz 1280x720 @ 60Hz 1280x960 @ 60Hz, 70Hz, 72Hz, 75Hz 1280x1024 @ 60Hz, 70Hz, 72Hz, 75Hz 1152x864 @ 60Hz, 70Hz, 72Hz, 75Hz Recommended Resolution 1280x1024 @ 60Hz Plug & Play VESA DDC 2B+ Standard Input Signals RGB Video: Analog, 0.0 ~ 0.7V Peak to Peak Sync. Signal: Separate 3.3V and 5V TTL H/V Sync. Input Connection VGA 15 pin D-Sub Speakers Stereo, 2 x 1W, with Amplifier Ear Phone Output No User Controls and Indicator Power Switch, LED Indicator, ESC, Up, Down, Enter On Screen Display Menu Controls: Contrast, Brightness,Volume,Auto Tune, Colour Auto Colour, Clock, Phase, H-Position,V-Position Smoothing, OSD Setting, Language, Reset Security OSD Lock Yes VESA Standard Compatible Yes (100 mm) Pivot screen No Swivel Base No USB Hub No Power Supply Built-In Power Supply Input Universal AC 100~240V (50~60Hz) Power Consumption 39 watt (max.) Monitor W x H x D w/base (mm) 368.7x368x205 Carton W x H x D (mm) 480x540x115 N.W./G.W. (kg) 5.1/6.1 Safety Regulations UL, CUL, FCC, CE, TUV/GS, ISO13406-2, TCO 99 BSMI

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SERVICE MANUAL

The Monitor Specialists

EDITION 1 DEC. 2003

CTX CTX

TABLE OF CONTENTS

CONTENTS Sections 1. Scope 2. Input requirements 3. Electrical Characteristics 4.Trouble Shooting 5. Parts List

Service Manual

6~10 11~16 16
Appendix 1. Main Board Circuit Diagram 2. Assembly Explosion Drawing

Copyright

2003 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.

1. SCOPE

This specification defines the design and performance requirements for the 17 SXGA TFT LCD display monitor The features of S762A.
S762A is listed in the following table :
Feature Description 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 9.10 Universal input AC/DC power supply inside the monitor Analog RGB interface (VGA ) 30~80KHz, 59~75Hz, 135MHz 17 SXGA 1280*1024, TFT LCD panel Function keys * 5 : Power On/Off, ESC, (up), (down), (enter) brightness function. contrast function, for Direct Acess function keys : for ESC for audio mute function.(S761A/S762A/S760A only) Green/Amber LED indicator for power on/power saving Plug & play support with DDC2B protocol installed. Power saving mode compliant with Energy Star OSD (on screen display) MENU operation Brightness adjustment Contrast adjustment Auto tune function (VGA) Color selection Image adjustment Language selection OSD position adjustment Reset function 1W * 2 Audio function inside the monitor (S762A/S761A /S760A Only) Volume adjust by OSD (S762A/S761A/S760A Only)

2. INPUT REQUIREMENTS

2.1 Input Power 2.1.1. Power Source 2.1.2. Power Consumption
100 ~ 240 Vac, + -10%, 50/60 Hz Normal operating mode Audio function is operating at max output: 39W w/o audio function: 36W Power saving mode Audio function is operating at max output: 7W w/o audio function: 2W
2.1.3. AC Line Drop Out 2.1.4. AC Wave Distortion 2.1.5. In-rush Current 2.1.6. Power Cord
Power switch off: 1W 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. Analog Input RGB Video

2.2.1.1 Sync Signal

Analog Input Connection
Analogue, 0.0 to 0.7 V peak to peak Separate RGB Input impedance 75 Ohm Positive polarity 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 length 1.5M in LCD Monitor end, D-sub male connector in another end. b. A female Mini D-sub 15 pin base.
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 2.3 Audio Input (S760A/S761A/S762A only) 2.3.1 Audio Input Signal Right &Left channels. Red Green Blue No Connection Ground R Return G Return B Return
Pin 9 Pin 10 Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 S762A DDC +5V Ground Ground SDA H. Sync V. Sync SCL
Input level: 1Vrms(typ), 2Vrms(max) Input Impedance: 15Kohm 2.3.2 Audio Input Connection a. Detachable stereo phone head in two ends signal cable. b. A female stereo phone jack base.
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 3.1.5. Backlight
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. 3H hard coating, anti-static, anti-glare Integral CCFL, type to support field replacement. Life time 30000 hours @ 25C, 50% of initial value.
3.1.6 Pixel Faults S762A/S761A/S760A/S762/S761/S760 Model Project LBL17S24HA01/LBL17B24HA01/LBL17W24HA01 LBL17S24HA/LBL17B24HA/LBL17W24HA Pixel Faults type Type Bright Pixels (Note 1) 5 Type Dark Pixels (Note 2) 5 Type Fault Pixels / Sub-Pixels(Note 3) 3 Type Cluster of type1 or type f ( ) Type Cluster of type3 faults (Note4) 3 Type 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.

3.2 Modes and Timing Comparability 3.2.1Analog Input Supported Timing VESA Standard mode: Display Format Horizontal Dots Vertical lines Horizontal Frequency Vertical Frequency ( Hz ) Pixel Rate ( MHz ) H. Sync. Polarity A S ( Period ) B S ( Pulse Width ) C S ( Back Porch ) D S ( Active Area ) E S (Front Porch ) V. Sync. Polarity O ms ( Period ) P ms ( Pulse Width ) Q ms ( Back Porch ) R ms ( Active Area ) S ms ( Front Porch ) Display Format Horizontal Dots Vertical lines Horizontal Frequency Vertical Frequency ( Hz ) Pixel Rate ( MHz ) H. Sync. Polarity A S ( Period ) B S ( Pulse Width ) C S ( Back Porch ) D S ( Active Area ) E S (Front Porch ) V. Sync. Polarity O ms ( Period ) P ms ( Pulse Width ) Q ms ( Back Porch ) R ms ( Active Area ) S ms ( Front Porch )
IBM VGA VESA VESA VESA 31.469 37.861 37.5 37.59.94 72.60.317 28.322 25.175 31.5 31.+ 31.778 26.413 26.667 26.4 3.813 1.270 2.032 3.2 1.907 4.063 3.810 2.2 25.422 20.317 20.317 20.0 0.636 0.763 0.508 1.00 + + 16.683 13.735 13.333 16.579 0.064 0.079 0.080 0.106 1.048 0.739 0.427 0.607 12.711 15.253 12.678 12.800 15.840 0.318 0.237 0.027 0.026 VESA VESA VESA VESA VESA VESA 48.363 56.746 60.023 67.5 63.981 79.976 60.004 70.069 75.60.013 75.025 65.78.+ + + + 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 + + + + 16.666 14.272 13.238 13.333 16.663 13.329 0.124 0.106 0.050 0.044 0.047 0.038 0.6 0.513 0.466 0.474 0.594 0.475 15.88 13.599 12.795 12.8 16.006 12.804 0.062 0.054 0.017 0.015 0.016 0.012
VESA 48.077 72.+ 20.8 2.4 1.28 16.0 1.12 + 13.853 0.125 0.478 12.480 0.770
VESA 46.875 75.000 49.5 + 21.333 1.616 3.232 16.162 0.323 + 13.333 0.064 0.448 12.8 0.021
VGA Support Mode 1280 * 1024 @70Hz,72Hz 1280 * 1280 * 1152 * 1024 * @ 60Hz,70H,72Hz,75Hz 720 @ 60Hz 864 @ 60Hz, 70Hz,72Hz 768 @ 72Hz * 600 @ 70Hz * 480 @ 70Hz * 350 @ 70Hz 7

H Sync

Video V Sync P Q R S

3.3 Plug & Play

DDC 2B data transmission only for I2C BUS interface card.
Scanning characteristics 8
Horizontal frequency Refresh rate 30KHz to 80KHz 59Hz to 75Hz
Audio Module (S762A/S761A/S760A) 3.5.1. Type: 3.5.2. Input Level: 3.5.3. Output Power: 3.5.4. Total Harmonic Distortion (THD): 3.5.5. Frequency Response 3dB: Stereo BTL audio output amplifier with DC volume control with two 1W speakers. 1Vrms 1W * 2 (10% THD, 1KHz) 0.3% (Typ.) (0.5W * 2, 1KHz) 550Hz ~ 20KHz

3.5.6. Channel unbalance (output power): 1dB (max.) 3.6 User Controls and Indicator 3.6.1 Power ON/OFF Switch 3.6.2 LED Indicator 3.6.3 OSD 3.6.3.1 Buttons 3.6.3.2 OSD Menu Level 3.6.4 Hot Keys Function 3.6.4.1 Contrast ( ) Press to pop up ;then press or to adjust Contrast up or down. 3.6.4.2 Brightness ( ) Press to pop up ;then press or to adjust Brightness up or down. Press Esc directly to disable speakers, while speakers in normal state. Press Esc directly to enable speakers, while speakers in audio mute state. Esc key is for Mute On and Off function key is for increasing volume function. key is for decreasing volume function. ESC key is enable or disable audio mute. Note:* means S762A only ESC , , , See Table 2. S762A/S761A/S760A/S762/S761/S760 OSD Control Map
The switch control scaler power down and turn off panel. The LED color shall indicate power status as shown in paragraph 3.7
*3.6.4.3 Mute On ( *3.6.4.4 Mute Off (
*3.6.4.5 In monitor power saving mode
Table 2 S762A OSD Control Map 1.VGA-D15 input: 9
Direct Adj Direct Adj *Direct Adj Level 1 Brightness Contrast *Audio Mute *Volume Auto Tune Color Level 2 Level 3

S762A Level 4

*Adjustment scale Auto Color 9300 K 6500 K User Clock Phase H-Position V-Position Smooth English(select) German(select) French(select) Spanish(select) Italian(select) (option) H-Position V-Position Center Yes/No

Image Main Menu Language

R/G/B select Adjustment scale Adjustment scale Adjustment scale Adjustment scale On/Off

Adjustment scale

OSD Position Reset
Adjustment scale Adjustment scale
Note:* means S762A/S761A/S760A only
3.6.5 Accessory OSD Indications Signal out of range An input signal which is outside the range defined in Section 3.4 shall cause the monitor to display a message Signal Out of Range.
No Signal Input and power down. When the signal cable is not plugged into PC or when the horizontal or vertical sync are absent and when the monitor is turned on. After 5 sec isnt to detect H or V Sync then show No Signal Input for 5 seconds and then show Power down message on screen 2 sec. And then the monitor shall go to power saving status. If first turn on the monitor, shows No Signal Input 30 sec.

3.7 Power Management

S762A This monitor will meet the low power specification, Including USA governmental requirements For Energy Star, the NUTEK standard and the VESA DPMS standard which detected the Hori. /Vert. Sync signal from host CPU. A dual color (green/amber) LED is located on the front bezel to indicate the power management states.

Sync. Active

Status Video Active
Power consumption With Audio: 39W Without Audio:36W 2W (Note.1)
Power management On Power saving
Picture Recovery time 3 sec

LED Color Green Amber

No Sync. Blanked
Note. 1: Audio function is operating at no signal input. Once Esc or or key initiates under power saving condition, the audio function can be waked up and the power consumption can not be the above definition. S762A only

4. TROUBLE SHOOTING

4.1 Main Procedure 11

Star t

Power On

I s indicator light?

4.2 Power Cir cuit T r ouble shooting
Yes No 4.3 No Back light T r ouble shooting

I s back light on? Yes

Display per for mance OK ?
4.4 Per for mance T r ouble shooting
Yes No 4.5 O.S.D. T r ouble shooting

O.S.D. A dj ustment OK ?

Yes No 4.6 A udio T r ouble shooting
A udio Function OK ? Yes No T r ouble Found
4.2 Power Circuit Trouble Shooting
Change AC power cor d and r etr y
No Change power boar d and r etr y OK End
Change display boar d and r etr y

No Tr ouble Found

Back to 4.1 M ain Pr ocedur e
4.3 Backlight Trouble Shooting 13
Change power boar d and r etr y
No Change main boar d and r etr y OK End
Change L CD panel and r etr y
4.4 Performance Trouble Shooting 14

Screen missing color

Change VGA cable OK

Change main board OK

No Block on screen Yes Change main board OK No Line on screen Yes Change main board OK No Screen is flickering Change power board OK Check panel connector OK Change main board OK Check main board connector OK Change LCD panel OK Change LCD panel OK Change main board OK Yes Change LCD panel OK Yes Change LCD panel OK

No Screen white

No Screen with noise & line bar
Press enter button call OSD Menu try Reset or Auto Tune OK

No Trouble Found End

4.5 O.S.D. Trouble Shooting 15

Pr ess Function key

No OSD M enu?
Change display boar d and r etr y OK
Change M ain boar d and r etr y OK
No Contr ast or Br ight Adj M enu?
4.6 Audio Trouble Shooting 16
M ake sur e sound output, Audio cable is OK.

No Sound?

Change Speaker

Sound is Br oken

Volume can t Adiust
PARTS LIST ITEM PART NUMBER AC1921-B01 DC1725-B01 GC1921-B01 10A17-4A2A SSBASE-0510168800 05Z0001900E 05Z0002900E DESCRIPTION MAIN PCBA POWER PCBA DISPLAY PCBA LCD TFT 1280*1024 AU SUB ASSY BASE HOLDER (R) HOLDER (L) PLASTIC HANDLE BAR PLASTIC CLAP BOARD

04008003000H CARTON

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