S720G SERVICE MANUAL The Monitor Specialists EDITION 1 Aug.. 2003 CTX CTX TABLE OF CONTENTS CONTENTS Sections 1. Scope 2. Input requirements 3. Electrical Characteristics 4. Trouble Shooting 5. System Block Diagram 6. Inverter Board I/O Connection 7. IC Pin Configuration 8. Pin Assignment 9. Parts List Appendix 1. Main Board Circuit Diagram 2. Assembly Explosion Drawing Service Manual S720G PAGE 3 4 5 10~11 12 13 14~15 16~25 26 -1- CTX CTX Copyright © 2003 by Chuntex Electronic Co., Ltd. Service Manual S720G 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. -2- CTX CTX 1. SCOPE Service Manual S720G This specification defines the design and performance requirements for the 17" SXGA TFT LCD display monitor.S720G Feature Description 1 2 3 4 5 6 7 8 9 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 10.10 11 12 Universal input AC/DC power supply inside the monitor Analog RGB interface (VGA ) 30~80KHz, 59~75Hz, 135MHz Digital Visual interface(DVI-D) TMDS 1 Channel 165 MHz 17" SXGA 1280*1024, TFT LCD panel Function keys * 5 : Power On/Off, ESC, (up), (down), (enter) contrast function, for brightness function , ESC Direct Acess function keys : for for audio mute function 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 Position adjustment Language selection Reset function Source selection(DVI/VGA) 1W * 2 Audio function inside the monitor Volume adjust by OSD OSD information of input status 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 : 35W Power saving mode Audio function is operating at max output: 7W w/o audio function 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 : 2W : 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. -3- CTX CTX Service Manual S720G 2.2 Display Input 2.2.1. Analog Input RGB Video 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. Detachable Mini D-sub 15 pin male in two ends signal cable , length 1.8M. b. A female Mini D-sub 15 pin base. Pin 9 DDC +5V Pin 1 Red Pin 10 Ground Pin 2 Green Pin 11 Ground Pin 3 Blue Pin 12 SDA Pin 4 No Connection Pin 13 H. Sync Pin 5 Ground Pin 6 R Return Pin 14 V. Sync Pin 7 G Return Pin 15 SCL Pin 8 B Return DVI-D V.1 TMDS 165MHz 1-Channel a. Captive cable (length 1.5M) in LCD monitor end , connector in another end. b. Cable pin assignment 2.2.1.1 Sync Signal Analog Input Connection 2.2.2 Digital Input Input Interface Digital Input connection DVI-D male DVI-D 1-Channel Pin Assignment Pin 1 2 3 4 5 6 7 8 Signal Assignment T.M.D.S Data 2T.M.D.S Data 2+ T.M.D.S Data 2 Shield NC NC DDC Clock DDC Data NC Pin 9 10 11 12 13 14 15 16 Signal Assignment T.M.D.S Data 1T.M.D.S Data 1+ T.M.D.S Data 1 Shield NC NC +5V Power Ground Hot Plug Detect Pin 17 18 19 20 21 22 23 24 Signal Assignment T.M.D.S Data 0T.M.D.S Data 0+ T.M.D.S Data 0 Shield NC NC T.M.D.S. Clock Shield T.M.D.S. Clock+ T M D S Clock 2.3 Audio Input 2.3.1 Audio Input Signal Right &Left channels. Input level : 1Vrms(typ), 2Vrms(max) Input Impedance : 15Kohm a. Detachable stereo phone head in two ends signal b. A female stereo phone jack base. 2.3.2 Audio Input Connection cable. -4- CTX CTX Service Manual S720G 3. ELECTRICAL CHARACTERISTICS 3.1 LCD Panel 3.1.1. Type 3.1.2. Pixel structure 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. Model S730G S720G LIS17G24KC01 LIS17S24KC01 3.1.3. Gray scale 3.1.4. Surface treatment 3.1.5. Backlight 3.1.6 Pixel Faults Project 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 2 faults(Note 2 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 ) IBM VGA 720 640 400 480 31.469 70 59.94 28.322 25.175 31.778 3.813 1.907 25.422 0.636 -5+ 16.683 0.064 VESA 640 480 37.861 72.809 31.5 26.413 1.270 4.063 20.317 0.763 13.735 0.079 VESA 640 480 37.5 75 31.5 26.667 2.032 3.810 20.317 0.508 13.333 0.080 VESA 800 600 37.879 60.317 40 + 26.4 3.2 2.2 20.0 1.00 + 16.579 0.106 VESA 800 600 48.077 72.188 50 + 20.8 2.4 1.28 16.0 1.12 + 13.853 0.125 VESA 800 600 46.875 75.000 49.5 + 21.333 1.616 3.232 16.162 0.323 + 13.333 0.064 CTX CTX Service Manual S720G 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 ) VESA 1024 768 48.363 60.004 65.0 20.667 2.092 2.462 15.754 0.369 16.666 0.124 0.6 15.88 0.062 VESA 1024 768 56.746 70.069 75 17.707 1.813 1.920 13.653 0.321 14.272 0.106 0.513 13.599 0.054 VESA 1024 768 60.023 75.029 78.75 + 16.660 1.219 2.253 13.003 0.203 + 13.238 0.050 0.466 12.795 0.017 VESA 1152 864 67.5 75 108 + 14.815 1.185 2.370 10.667 0.593 + 13.333 0.044 0.474 12.8 0.015 VESA 1280 1024 63.981 60.013 108 + 15.631 1.180 2.065 11.797 0.590 + 16.663 0.047 0.594 16.006 0.016 VESA 1280 1024 79.976 75.025 135 + 12.054 1.067 1.837 9.481 0.119 + 13.329 0.038 0.475 12.804 0.012 Timing Chart -6- CTX CTX Figure. 1 Timing Chart Service Manual S720G Video H Sync. B C D A E Video 3.2.2 Digital Input DVI Support mode 640 * 480 @60Hz 800 * 600 @60Hz 1024*768 @60Hz 1280*1024@60Hz 3.3 Plug & Play DVI support VESA DDC 2B+ standard DDC 2B data transmission only for I2C BUS interface card. 3.4 Scanning characteristics Horizontal frequency Refresh rate 3.5 Audio Module 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 : VGA DVI(DDC description) 30KHz to 80KHz 30KHz to 66KHz 59Hz to 75Hz 59Hz to 61Hz DVI(Input signal range) 30KHz to 80KHz 59Hz to 75Hz 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) 450Hz ~ 20KHz 3.5.6. Channel unbalance (output power): 1dB (max.) -7- CTX CTX 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 ( ) ESC , , , Service Manual S720G The switch control scaler power down and turn off panel. The LED color shall indicate power status as shown in paragraph 3.7 See Table 2. S730G/S720G OSD Control Map 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. 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 3.6.4.2 Brightness ( *3.6.4.3 Mute On ( *3.6.4.4 Mute Off ( ) *3.6.4.5 In monitor power saving mode " " key is for increasing volume function. " " key is for decreasing volume function. "ESC" key is enable or disable audio mute. *3.6.4.6 Key lock function Push" " for 10 sec while the screen has no any OSD showing to Setup "Key lock" functions enable or disable. Table 2 S720G/S730G OSD Control Map Level 1 Direct Adj. Direct Adj. Direct Adj. Brightness Contrast Audio Mute Volume *Auto Tune Color Adjustment Scale *Adjustment Scale 9300 K 6500 K User *Clock Image *Phase Smooth Main Menu *Image Position -8R/G/B select *Adjustment Scale *Adjustment Scale On/Off *H-Position *Adjustment Scale Adjustment Scale Level 2 Level 3 Level 4 CTX CTX *V-Position *Center H-Position OSD Position V-Position Center English (select) Language Deatsch (select) French (select) Spanish (select) Italiano (select) (option) Yes/No DVI/VGA Service Manual S720G *Adjustment Scale *Adjustment Scale Adjustment Scale Adjustment Scale Adjustment Scale Reset Source *Function is disable in DVI mode. 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 , Input Source "auto detecting" 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 isn't to detect H or V Sync then show "No Signal Input" for 3 seconds then show"Auto detecting" message on the OSD for 2seconds,( if first turn on the monitor that will show it around 27 seconds.), and then show " Power down" message on screen 2 sec.And then the monitor shall go to power saving status. -9- CTX CTX 3.7 Power Management Service Manual S720G 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. Status Video Active Power consumption 39W max. Power management On Sync. Active Picture Recovery time - LED Color Green No Sync. Blanked Power saving Amber 2W 3 sec (Note.1) 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. 4. TROUBLE SHOOTING VIDEO DOES NOT APPEAR -10- CTX CTX Service Manual S720G -11- CTX CTX R.G.B is not displayed correctly Service Manual S720G -12- CTX CTX Service Manual S720G 5. SYSTEM BLOCK DIAGRAM -13- CTX CTX Service Manual S720G 6. inverter board I/O connections -14- CTX CTX Service Manual S720G 7. IC PIN CONFIGURATION -15- CTX CTX Service Manual S720G -16- CTX CTX Service Manual S720G 8. PIN ASSIGNMENT MAIN/BOARD -17- CTX CTX TEST CONDITION : AC LINE IN: 110V/60Hz PATTEN:FULL WHITE Uint:Volt IC PIN MODE 640*480 31K/60Hz 1024*768 60K/75Hz 1280*1024 80K/75Hz DVI1280*1024 64K E 0 0 0 0 Q7(2N3904) C 3.28 3.27 3.28 3.27 B 0.03 0.03 0.03 0.03 Q634(MMBT3906LT1) E 3.38 3.38 3.38 3.38 C 3.37 3.37 3.37 3.37 B 2.77 2.77 2.77 2.76 Service Manual S720G Q635(2N3904) E 0 0 0 0 C 0.01 0.01 0.01 0.01 B 0.75 0.75 0.75 0.75 IC PIN MODE 640*480 31K/60Hz 1024*768 60K/75Hz 1280*1024 80K/75Hz DVI1280*1024 64K E 2.00 2.00 2.00 2.00 Q636(3906) C 1.96 1.96 1.96 1.96 B 1.28 1.28 1.28 1.28 E 3.38 3.38 3.38 3.38 Q637(3906) C 0.06 0.06 0.06 0.07 B 3.38 3.38 3.38 3.38 E 3.38 3.38 3.38 3.38 Q638(3906) C 3.38 3.39 3.39 3.38 B 2.77 2.78 2.78 2.77 IC PIN MODE 640*480 31K/60Hz 1024*768 60K/75Hz 1280*1024 80K/75Hz DVI1280*1024 64K E 0 0 0 0 Q639(2N3904) C 0.06 0.06 0.06 0.06 B 0.68 0.68 0.68 0.68 E 0 0 0 0 Q641(2N3904) C 11.19 11.19 11.19 11.18 B 0.01 0.02 0.02 0.01 E C B IC PIN MODE 640*480 31K/60Hz 1024*768 60K/75Hz 1280*1024 80K/75Hz DVI1280*1024 64K 1 3.38 3.3 ...