Viewsonic VA915-1 Service Manual 1a

Service Manual

ViewSonic VA915-1

Model No. VLCDS27944-3

19” Color TFT LCD Display

ViewSonic

(VA915_SM Rev. 1a May 2005)



381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.

Disclaimer

ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

Trademarks

Optiquest is a registered trademark of ViewSonic Corporation. ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners.

ECR Number

05/26/05

Revision History

Description of Changes

Initial Release

EditorRevision SM Editing Date

A. Lu

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

5. Adjustment Procedure

6. TroubleShooting Flow Chart

7. Recommended Spare Parts List

8. Exploded Diagram and Spare Parts List

9. Block Diagram

10. Schematic Diagrams

11. PCB Layout Diagrams

12 19

20 30

34 41 42 43

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1. Precautions and Safety Notices

1. Appropriate Operation

(1) Turn off the product before cleaning. (2) Use only a dry soft cloth when cleaning the LCD panel surface. (3) Use a soft cloth soaked with mild detergent to clean the display housing. (4) Use only high quality and safety approved AC/DC power cord. (5) Disconnect the power plug from AC outlet if the product is not used for a long period of time. (6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off. (7) Do not touch the LCD panel surface with sharp or hard objects. (8) Do not place heavy objects on the LCD display, video cable, or power cord. (9) Do not use abrasive cleaners, waxes or solvents for your cleaning. (10) Do not operate the product under the following conditions:

- Extremely hot, cold or humid environment.

- Areas susceptible to excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- Place in direct sunlight.

2. Caution

No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly familiar

with all of the following safety checks and servicing guidelines.

3. Safety Check

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is

exposed in such areas as the associated transformer circuits.

4. LCD Module Handling Precautions

4.1 Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it. (2) Be sure to turn off power supply when inserting or disconnecting from input connector. (3) Wipe off water drop immediately. Long contact with water may cause discoloration or spots. (4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth. (5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface. (6) Since CMOS LSI is used in this module, take care of static electricity and insure human earth when handling. (7) Do not open nor modify the Module Assembly. (8) Do not press the reflector sheet at the back of the module to any directions. (9) In case if a Module has to be put back into the packing container slot after once it was taken out from the

container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the CFL

Reflector edge softly. Otherwise the TFT Module may be damaged.

(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate nor tilt the Interface

Connector of the TFT Module.

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(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist nor

bend the TFT Module even momentary. At designing the enclosure, it should be taken into consideration that

no bending/twisting forces are applied to the TFT Module from outside. Otherwise the TFT Module may be

damaged.

(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please follow local ordinances or

regulations for disposal.

(13) Small amount of materials having no flammability grade is used in the LCD module. The LCD module should

be supplied by power complied with requirements of Limited Power Source (IEC60950 or UL1950), or be

applied exemption.

(14) The LCD module is designed so that the CFL in it is supplied by Limited Current Circuit (IEC60950 or

UL1950). Do not connect the CFL in Hazardous Voltage Circuit.

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2. Specification

2.1 General Description

LCD Fujitsu: FLC48SXC8V-11E CMO: M190E2-L01 M190E3-L02

Input Signals

Active matrix thin-film-transistor (TFT) Type No: FLC48SXC8V-11E/ M190E2-L01 ;M190E3-L02 Active screen Size Effective Display Size Pixel Pitch Pixel Format Brightness

Contrast Ratio

Color (8 bits) Viewing Angle range

(CR≧10, at Ta=25°C)

Backlight

19.0 inches diagonal

376.32mm (H) × 301.056mm (V)

0.294mm (H) × 0.294mm(V) 1280×1024 (SXGA ) 250cd/m

(Typ.& CMO panel), 300cd/m2 (Typ.& Fujitsu panel) 500:1 typ ( CMO E2 panel) , 1000:1 ( CMO E3 panel) 700:1 (Typ. & Fujitsu panel) 16,777,216 colors Up 85° Down 85°(type) Left 85° Right 85°(type)

4 CCFL

Analog RGB 0.7Vp-p / 75Ω Digital RGB DVI Ver1.0 (TMDS Single Link)

H/V Separate sync. Sync 2.0~5.0Vp-p, Positive/Negative, 2.2KΩ

Input connector Analog D-sub 15 pin *1

Digital DVI-D 24pin *1

Synchronization Horizontal

Vertical Non-interlaced

30 kHz to 82 kHz 50 Hz to 75 Hz

(automatically) (automatically)

Maximum P ixel Rated 135MHz

Resolution Horizontal

Vertical

Active Display Area Horizontal

Vertical Power Supply Voltage Rating AC Power Consumption

AC input

DC 12V

less than 60W

less than 1W

1280 dots 1024 lines

376.32 mm (typical, panel depends)

301.056 mm (typical, panel depends) AC 100V~240V / 2A, 47.5~63Hz

4.5A. On mode. Active OFF mode. DC Power OFF.

Current Rating AC input 1.5A @AC 100~240V.

Dimensions

Weight

Environmental Conditions

Net

Gross

Depth(head only)

Net

Gross

Operating Temperature

Operating Humidity

Storage Temperature

Storage Humidity

442(W) x 405(H) x69.5 (D) mm 442(W) x 473.1(H) x 181.2(D) mm (With stand base)

181.2mm

7.5 Kg

10.3 Kg 0 to 40°C 20 to 85%

-20 to 60°C 5 to 85% (non-condensation)

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Accessories AC cable

User Guide CD Rom Warranty Card HD15 - HD15 cable DVI(D) - DVI(D) cable

1.83m English 1 1 1 1

Regulatory Standards UL, cUL, FCC-B, CB, CE, EnergyStar, ENERGY, NOM, TUV/GS, TUV ERGO

(covers ISO13406-2 & MPRII), TCO99(VG910b)or TCO03(VG910s), GOST-R + 20 ORIGINAL COPIES HYGIENIC,(SASO), PCBC, VCCI, BSMI,CCC(PSB),(C-TICK), TUV-S,Taiwan green mark,PCT(BZ02)

Others Tilt Angle 20° up / 5° down

VESA DDC 2B compatible

2.2 Electrical Characteristics

2.2.1 Power Supply AC Input Voltage AC 100~240V / 47.5~63Hz

Power Consumption：

Less than 60W On mode Less than 1W Active Off mode Less than 1W DC power Off Current Rating 1.5A @ AC 100~240V

Inrush Current :

Less than 50 Amp(peak) for 120 VAC Less than 100 Amp(peak) for 220 VAC

Power cord：detachable, 3P, 1.83m

2.2.2 LCD LCD Active matrix thin-film-transistor (TFT) Active screen size 19.0 inches (376.32mm × 301.056mm) diagonal Pixel Format 1280 x 1024 (SXGA )

R.G.B. stripe arrangement Display method TFT, normally Black Pixel pitch 0.294 (H) x 0.294 (V) mm Dot number 1280 x 1024 x 3 dots Backlight Edge-lighting type with 4 CCFL

(Cold Cathode Fluorescent Lamp) Brightness 250 cd/m Contrast ratio ( Typ) 500:1 (CMO E2 panel), 1000:1 (CMO E3 panel );700:1

(Typ. & CMO panel), 300 cd/m2 (Typ. & Fujitsu panel)

( Fujitsu panel) Display color 16,777,216 colors viewing angle typical Up 85° / down 85° / right 85° / left 85°

(Contrast ratio≧10 at Ta=25°C / 77°F)

Response time (Typ) Rise time 15mS, Fall time 10mS.

Rise time 13mS, Fall time 7mS for CMO E3 panel

2.2.3 Power Management VG910 will enter power saving mode under the following conditions: Power Management condition and status in AC 240V

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State

Signals

Horizontal Vertical Video

Power

Supply

On Pulses Pulses Active <50W Green

Active off

Pulse No Pulse

No Pulse Pulse

Blank

<1W

No Pulses No Pulses

Out off scan range

<30KHz ,

>82KHz

<50Hz ,

>75Hz

<5 0W

AC power Off - - - Off Off DC power Off - - - <1W Off

2.3 Video alignment

2.3.1 COLOR TEMPERATURE ALLIGMENT a. APPLY VESA 1280x1024 / 60Hz , FULL WHITE PATTERN.( INPUT SIGNAL LEVEL

=0.7Vp-p )

b. AUTO WHITE BANLANCE MUST BE FINISH AT 32 GRAY PATTERN BEFORE AUTO

ALIGNMENT,

c. SET DEFAULT Æ CONTRAST TO 70% , BRIGHTNESS TO 100%

9300°K, 6500°K,：R G B SUB-BRIGHTNESS SET AS BELOW

LED

Amber

Green

R SUB-BRIGHTNESS 128 128 128 128 G SUB-BRIGHTNESS 128 128 128 128

B SUB-BRIGHTNESS 128 128 128 128 SET BLACKLEVEL = 255, GAMMA=OFF AT FACTORY DEFAULT. SET BRIGHTNESS =134 AT FACTORY DEFAULT FOR FUJITSU PANEL SET BRIGHTNESS =130 AT FACTORY DEFAULT FOR CMO PANEL

2.3.2 DIGITAL ALIGNMENT

2.3.2.1 APPLY VESA 1280x1024 / 60Hz , FULL WHITE PATTERN ,

2.3.2.2 ADJUST R, G, B SUB-CONTRAST TO MEET FOLLOWING CHROMATICITY SPEC.

x = 0.313 ±0.003 , y = 0.329 ±0.003

2.3.3 ANALOG ALIGNMENT

2.3.3.1 9300°K HIGH LUMINANCE ALIGNMENT

2.3.3.1.1 APPLY VESA 1280x1024 / 60Hz , FULL W HITE PATTERN.

2.3.3.1.2 ADJUST R, G, B SUB-CONTRAST TO MEET FOLLOW ING

9300°K 6500°K 5400°K 5000°K

CHROMATICITY SPEC. 9300°K → x = 0.283 ±0.003, y = 0.298 ±0.003 , Y > 155 cd/m

2.3.3.2 6500°K HIGH LUMINANCE ALIGNMENT

2.3.3.2.1 APPLY VESA 1280x1024 / 60Hz , FULL WHITE PATTERN.

2.3.3.2.2 ADJUST R, G, B SUB-CONTRAST TO MEET FOLLOWING

CHROMATICITY SPEC. 6500°K → x = 0.313±0.003, y = 0.329 ±0.003 , Y > 190 cd/m

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2.3.3.3 5400°K HIGH LUMINANCE ALIGNMENT

2.3.3.3.1 APPLY VESA 1280x1024 / 60Hz , FULL WHITE PATTERN.

2.3.3.3.2 ADJUST R, G, B SUB-CONTRAST TO MEET FOLLOWING

2.3.3.4 5000°K HIGH LUMINANCE ALIGNMENT

2.3.3.4.1 APPLY VESA 1280x1024 / 60Hz , FULL WHITE PATTERN.

2.3.3.4.2 ADJUST R, G, B SUB-CONTRAST TO MEET FOLLOWING

2.3.4 LUMINANCE TEST

2.3.4.1 SET COLOR Temperature TO 9300°K APPLY VESA 1280x1024/60Hz , APPLY FULL WHITE PATTERN, ADJUST

OSD BRIGHTNESS = 100%, CONTRAST = 70%.

1. THE LUMINANCE MEASURE SHOULD BE OVER 155cd/m

2.3.4.2 SET COLOR Temperature TO 6500°K APPLY VESA 1280x1024 / 60Hz , APPLY FULL WHITE PATTERN, ADJUST

OSD BRIGHTNESS = 100%, CONTRAST = 70%

1. THE BRIGHTNESS MEASURE SHOULD BE OVER 190cd/m

2. SET BRIGHTNESS =100% , CONTRAST=100% ,THE LUMINANCE

2.3.4.3 SET COLOR Temperature TO 5400°K APPLY VESA 1280x1024 / 60Hz , APPLY FULL WHITE PATTERN, ADJUST

OSD BRIGHTNESS = 100%, CONTRAST = 70%

1. THE BRIGHTNESS MEASURE SHOULD BE OVER 180cd/m

2.3.4.4 SET COLOR Temperature TO5000°K APPLY VESA 1280x1024 / 60Hz , APPLY FULL WHITE PATTERN, ADJUST

OSD BRIGHTNESS = 100%, CONTRAST = 70%

1. THE BRIGHTNESS MEASURE SHOULD BE OVER 180 cd/m

2.3.4.5 APPLY VESA 1280x1024/60Hz , APPLY FULL WHITE PATTERN, ADJUST OSD BRIGHTNESS 100%, CONTRAST 70% , MEASUREMENT AT CENTER OF SCREEN

CHROMATICITY SPEC. 5400°K → x = 0.335 ±0.003, y = 0.350 ± 0.003 , Y > 180cd/m

CHROMATICITY SPEC. 5000°K → x = 0.346 ±0.003, y = 0.359 ±0.003 , Y > 180cd/m

MEASURE SHOULD BE OVER 220cd/m

MODE X y Y

9300°K 0.283±0.010 0.298 ±0.010 6500°K 0.313 ±0.010 0.329 ±0.010 5400°K 0.335 ±0.010 0.350 ±0.010 5000°K 0.346 ±0.010 0.359 ±0.010

OVER 155 cd/m

OVER190 cd/m OVER 180 cd/m OVER 180 cd/m

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2.5 EDID SERIAL NO. FORMAT

2.5.1 EDID for VA915 (FLC48SXC8V-11E)

2.5.1.1 Analog EDID 128 BYTES OF EDID CODE:

0 1 2 3 4 5 6 7 8 9

0 00 FF FF FF FF FF FF 00 5A 63 10 18 DA 01 01 01 01 01 0E 01 03 20 0E 26 1E 78 2E C2 75 A3 5A 4A 30 9F 24 13 50 54 BF EF 80 81 80 40 81 40 71 4F 01 01 01 01 01 01 50 01 01 01 01 30 2A 00 98 51 00 60 2A 40 30 70 13 00 78 2D 11 00 70 00 1E 00 00 00 FF 00 41 33 31 80 30 34 30 31 30 30 30 30 31 0A 90 00 00 00 FD 00 32 4B 1E 52 0E

100 00 0A 20 20 20 20 20 20 00 00 110 00 FC 00 56 47 39 31 30 73 0A 120 20 20 20 20 20 20 00 CC

2.5.1.2 Digital EDID 128 BYTES OF EDID CODE:

0 1 2 3 4 5 6 7 8 9

0 00 FF FF FF FF FF FF 00 5A 63 10 18 DA 01 01 01 01 01 0E 01 03 20 80 26 1E 78 2E C2 75 A3 5A 4A 30 9F 24 13 50 54 BF EF 80 81 80 40 81 40 71 4F 31 0A 01 01 01 01 50 01 01 01 01 30 2A 00 98 51 00 60 2A 40 30 70 13 00 78 2D 11 00 70 00 1E 00 00 00 FF 00 41 33 31 80 30 34 30 31 30 30 30 30 31 0A 90 00 00 00 FD 00 32 4B 1E 52 0E

100 00 0A 20 20 20 20 20 20 00 00 110 00 FC 00 56 47 39 31 30 73 0A 120 20 20 20 20 20 20 00 21

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APPENDIX A : PRESET TIMING CHART

Analog Mode

1 2 3 4 5 6 7

Signal name

symbol

TEXT

mode

TEXT

mode

VGA MAC-II VESA-VGA VESA-VGA VESA-VGA

H-frequency (kHz) 31.468 31.469 31.468 35.001 37.5 37.862 43.269 V-frequency (Hz) Pixel rate (MHz) H-sync Ths H-back porch Thb Count num (H-total) Thd H- front porch Thf V-sync Tvs V-back porch Tvb Count num (V-total) Tvd V-front porch Tvf H-sync. Polarity V-sync Polarity H-resolution (dots) V-resolution (lines)

70.087 70.087 59.941 66.667 75 72.807 85.005

25.175 28.322 25.175 30.240 31.5 31.501 36.000 96 108 96 64 64 40 56 48 54 48 96 120 128 80

800 900 800 864 840 832 832

16 18 16 64 16 24 56

2 2 2 3 3 3 3

60 35 33 39 16 28 25

449 449 525 525 500 520 509

37 12 10 3 1 9 1

Positive Negative Negative Negative Negative Negative Negative

Negative Positive Negative Negative Negative Negative Negative

640 720 640 640 640 640 640 350 400 480 480 480 480 480

8 9 10 11 12 13 14

Signal name Symbol

IBM-8514

SVGA SVGA SVGA SVGA MAC 16" XGA

H-frequency (kHz) 35.156 37.879 48.077 46.875 53.674 49.725 48.363 V-frequency (Hz) 56.250 60.317 72.188 75.000 85.061 74.5 60.004 Pixel rate (MHz) 36.000 40.000 50.000 49.500 56.250 57.283 65.000 H-sync Ths 72 128 120 80 64 64 136 H-back porch Thb 128 88 64 160 152 224 160 Count num (H-total) Thd 1024 1056 1040 1056 1048 1152 1344 H- front porch Thf 24 40 56 16 32 32 24 V-sync Tvs 2 4 6 3 3 3 6 V-back porch Tvb 22 23 23 21 27 39 29 Count num (V-total) Tvd 625 628 666 625 631 667 806 V-front porch Tvf 1 1 37 1 1 1 3 H-sync. Polarity Negative Positive Positive Positive Positive Negative Negative V-sync Polarity Negative Positive Positive Positive Positive Negative Negative H-resolution (dots) 800 800 800 800 800 832 1024 V-resolution (lines) 600 600 600 600 600 624 768

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15 16 17 18 19 20 21

Signal name Symbol XGA XGA XGA XGA SXGA 720P SXGA H-frequency (kHz) 56.476 58.099 60.023 68.677 63.981 45.000 79.976 V-frequency (Hz) 70.069 72.082 75.029 84.997 60.02 60.00 75.025 Pixel rate (MHz) 75.000 78.084 78.750 94.500 108 74.250 135 H-sync Ths 136 136 96 96 112 40 144 H-back porch Thb 144 160 176 208 248 270 248 Count num

Thd 1328 1344 1312 1376 1688 1658 1688 (H-total) H- front porch Thf 24 24 16 48 48 60 16

V-sync Tvs 6 6 3 3 3 5 3 V-back porch Tvb 29 29 28 36 38 20 38 Count num

Tvd 806 806 800 808 1066 750 1066 (V-total) V-front porch Tvf 3 3 1 1 1 5 1

H-sync. Polarity Negative Negative Positive Positive Po sitive Negative Positive V-sync Polarity Negative Negative Positive Positive Positive Negative Positive H-resolution (dots) 1024 1024 1024 1024 1280 1280 1280 V-resolution (lines) 768 768 768 768 1024 720 1024

Notes: Because this model no support FRC and in order to meet the panel spec of vertical frequency,

some timing can not full screen in vertical size. Ex:640x400/70Hz;640x350/70Hz ;720x400/70Hz ;640x480/85Hz;800x600/85Hz; 1024x768/85Hz.

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Digital Mode

1 2 3 4 5 6 7

Signal name symbol TEXT

mode

TEXT

mode

VGA VGA VESA-VGA VESA-VGA VESA-VGA

H-frequency (kHz) 31.468 31.469 31.468 31.468 37.5 37.862 43.269 V-frequency (Hz) 70.087 70.087 70.000 59.941 75 72.807 85.005 Pixel rate (MHz) 25.175 28.322 25.175 25.175 31.5 31.501 36.000 H-sync Ths 96 108 96 96 64 40 56 H-back porch Thb 48 54 48 48 120 128 80 Count num (H-total) Thd 800 900 800 800 840 832 832 H- front porch Thf 16 18 16 16 16 24 56 V-sync Tvs 2 2 2 2 3 3 3 V-back porch Tvb 60 35 35 33 16 28 25 Count num (V-total) Tvd 449 449 449 525 500 520 509 V-front porch Tvf 37 12 10 6 1 9 1 H-sync. Polarity Positive Negative Negative Negative Negative Negative Negative V-sync Polarity Negative Positive Negative Negative Negative Negative Negative H-resolution (dots) 640 720 640 640 640 640 640 V-resolution (lines) 350 400 400 480 480 480 480

8 9 10 11 12 13 14

Signal name Symbol IBM-8514A SVGA SVGA SVGA SVGA XGA XGA

H-frequency (kHz) 35.156 37.879 48.077 46.875 53.674 48.363 56.476 V-frequency (Hz) 56.250 60.317 72.188 75.000 85.061 60.004 70.069 Pixel rate (MHz) 36.000 40.000 50.000 49.500 56.250 65.000 75.000 H-sync Ths 72 128 120 80 64 136 136 H-back porch Thb 128 88 64 160 152 160 144 Count num (H-total) Thd 1024 1056 1040 1056 1048 1344 1328 H- front porch Thf 24 40 56 16 32 24 24 V-sync Tvs 2 4 6 3 3 6 6 V-back porch Tvb 22 23 23 21 27 29 29 Count num (V-total) Tvd 625 628 666 625 631 806 806 V-front porch Tvf 1 1 37 1 1 3 3 H-sync. Polarity Negative Positive Positive Positive Positive Negative Negative V-sync Polarity Negative Positive Positive Positive Positive Negative Negative H-resolution (dots) 800 800 800 800 800 1024 1024 V-resolution (lines) 600 600 600 600 600 768 768

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15 16 17 18 19

Signal name Symbol XGA XGA XGA SXGA HD-720P H-frequency (kHz) 58.099 60.023 68.677 63.981 45.000 V-frequency (Hz) 72.082 75.029 84.997 60.02 60.00 Pixel rate (MHz) 78.084 78.750 94.500 108 74.250 H-sync Ths 136 96 96 112 40 H-back porch Thb 160 176 208 248 270 Count num (H-total) Thd 1344 1312 1376 1688 1658 H- front porch Thf 24 16 48 48 60 V-sync Tvs 6 3 3 3 5 V-back porch Tvb 29 28 36 38 20 Count num (V-total) Tvd 806 800 808 1066 750 V-front porch Tvf 3 1 1 1 5 H-sync. Polarity Negative Positive Po sitive Positive Negative V-sync Polarity Negative Positive Positive Positive Negative H-resolution (dots) 1024 1024 1024 1280 1280 V-resolution (lines) 768 768 768 1024 720

Notes: Because this model no support FRC and in order to meet the panel spec of vertical frequency,

some timing can not full screen in vertical size. Ex:640x400/70Hz;640x350/70Hz ;720x400/70Hz ;640x480/85Hz;800x600/85Hz; 1024x768/85Hz.

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3. Front Panel Function Control Description

Adjusting the Screen Image

Use the buttons on the front control panel to display and adjust the OnView

controls which display on the screen. The OnView controls are explained at the top of the next page.

Main Menu with OnView controls

Front Control Panel shown below

Speaker Speaker

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

Displays the Main Menu or exits the control screen and saves adjustments

Decreases or increases volume

Audio Mute button turns the sound off.

Displays the control screen for the highlighted control.

Also toggles between two controls on some screens.

Also a shortcut to toggle between analog and digital connections.

Power light Green = ON Orange = Power

Saving

Power On/Off

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Do the following to adjust the screen image:

To display the Main Menu, press button [1].

NOTE:

All OnView menus and adjustment screens disappear automatically

after about 30 seconds.

To select a control you want to adjust, press ▲ or ▼ to scroll up or down the

Main Menu. After the control is selected, press button [2]. A control screen like the one

shown below appears.

The line at the

The ▼down arrow decreases,

▲

up arrow

increases

To adjust the control, press the up ▲ or down ▼ buttons.

To save the adjustments and exit the menu, press button [1]

bottom of the screen tells you what you can do next: Exit or select the Brightness control.

twice

The following tips may help you optimize your display:

• Adjust your computer's graphic card so that it outputs a video signal 1280 x 1024 @ 60 Hz to the LCD display. (Look for instructions on "changing the refresh rate" in your graphic card's user guide.)

• If necessary, make small adjustments using H POSITION and V POSITION until the screen image is completely visible

. (The black border around the edge of the screen should barely touch the illuminated "active area" of the LCD display.)

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Main Menu Controls

Adjust the menu items shown below by using the up ▲ and down ▼ buttons.

Control Explanation

Auto Image Adjust

automatically sizes, centers, and fine tunes

the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image. NOTE: Auto Image Adjust works with most common video

cards. If this function does not work on your LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value.

Contrast

adjusts the difference between the image background

(black level) and the foreground (white level).

Brightness

Input Select

adjusts background black level of the screen image.

toggles between inputs if you have more than one

computer connected to the VG910b/VG910s.

Audio Adjust

Volume

increases the volume, decreases the volume, and mutes

the audio.

Balance

adjusts the proportion of sound coming from each

speaker.

Bass

Tre bl e

Mute

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adjusts the low (bass) frequency audio output.

adjusts the high (treble) frequency audio output.

temporarily silences audio output.

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Control Explanation

Color Adjust

color temperatures and

provides several color adjustment modes: preset

RGB

which allows you to adjust red (R), green (G), and blue (B) separately. The factory setting for this product is 6500K (6500 Kelvin).

sRGB

— sRGB is quickly becoming the industry standard for

color management, with support being included in many of the latest applications. Enabling this setting allows the LCD display to more accurately display colors the way they were originally intended. Enabling the sRGB setting will cause the Contrast and Brightness adjustments to be disabled.

9300K

— Adds blue to the screen image for cooler white (used

in most office settings with fluorescent lighting).

6500K

— Adds red to the screen image for warmer white and

richer red.

5400K

5000K

— Adds green to the screen image for a darker color.

— Adds blue and green to the screen image for a darker

color.

User Color

and blue (B)

To select color (R, G or B) press button [2].

To adjust selected color, press ▲ or ▼.

Important

— Individual adjustments for red (R), green (G),

: If you select RECALL from the Main Menu when the product is set to a Preset Timing Mode, colors return to the 6500K factory preset.

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Control Explanation

Information

displays the timing mode (video signal input) coming from the graphics card in your computer. See your graphic card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).

NOTE:

VESA 1280 x 1024 @ 60 Hz (recommended) means that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz.

Manual Image Adjust

displays the Manual Image Adjust menu.

The

Manual Image Adjust

Horizontal Position

Vertical Position

Horizontal Size

Fine Tune

sharpens focus by aligning the illuminated text and/

moves the screen image left or right.

moves the screen image up or down.

adjusts the width of the screen image.

or graphic characters.

Sharpness

adjusts the clarity and focus of the screen image.

controls are explained below:

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