Viewsonic vg700b-2 Service Manual 1b

Service Manual

ViewSonic VG700b-2

Model No. VLCDS24606-1W

17” Color TFT LCD Display

ViewSonic

(VG700b-2_SM_605 - Rev. 1b Feb. 2004)



381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

Copyright

Copyright
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.

2003 by ViewSonic Corporation. All rights reserved. No part of this publication may be

¤

Revision History

Revision Date Description Of Changes Approval

1a 14/04/03 Initial Release DCN- 2661 WANGJE

1b 02/10/04

Change Panel from QDI to LG by region DCN-420

9 Angela Luh

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

5. Adjusting Procedure

6. Trouble Shooting Flow Chart

7. Recommended Spare Parts List

8. Exploded Diagram And Spare Parts List

9. Block Diagram

10. Schematic Diagrams

11. PCB Layout Diagrams

1

2
3

5

13

17

20
24
26
27

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1. Precautions and Safety Notices

1. 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 guide line.

2. Safety Check :

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter
circuit. These voltages are exposed in such areas as the associated transformer circuits.

3. POWER SUPPLY REQUIREMENTS
The external power converter for this display utilizes AC and DC cords, AC cord is detachable, but DC

cord is permanently attached. Any attempt to replace another adapter could result in serious problem
on the display.

4. LEAKAGE CURRENT HOT CHECK
4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.
4-2 Connect a 1500 ohm, 10 watt resistor, paralleled by a 0.15uF capacitor between each metallic part

and a good earth ground.

4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across

the combination 1500 ohm resistor and 0.15uF capacitor.
4-4 Move the resistor connection to each exposed metallic part and measure the voltage.
4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.
4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. A

leakage current tester may be used in the above hot check, in which case any circuit measured must

not exceed 1.0 milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a

rework is required to eliminate the chance of a shock hazard.

AC VOLTMETER

V

ViewSonic Corporation

To Metal Parts

0.15u
.

1500 10W

1

Earth Ground

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2. Specification

Mechanical:
Dimension ( W x H x D ) mm

Set: a. with stand
b. Without stand
Base (L X W) 290 x 180 mm

cking : ( W x H x D ) mm

Pa

Weight: Net / Gross ( Kg ) 4.5 / 6.9
Wall Mount (VESA) 100 x 100 mm

LCD Panel type QDI / QD17EL07

410.0 x 433 x 180 mm

410.0 x 433 x 58.4 mm

472 x 515 x 216 mm

Max. Resolution (HxV)

Nominal picture size (HxV 338 mm x 270 mm

Display colors 16.2 M ( 6 bit + dithering)

Dot pitch

Response time 4 +16 / 20ms (Tr + Tf / typical)

Brigh

tness (100% white) Typical: 300 cd/m² , Min. 240cd/m²
Contrast
Viewing angle 75 / 75 /65 / 60 (L/R/T/B CR>=10)
Synchronization Fh = 31~82 KHz / Fv=50~75Hz
Presets 18 timing modes

OSD Language
Color Temperature sRGB , 6500°K (default) / 9300°K

Plug & Play DDC1/2B interface
Scalar chip Genesis gm2121 AD
Audio Input Connector 3.5 mm Stereo, PC2001
Audio Amplifier 3W x 2 (chip :TPA3002D2)

1280 x 1024

0.264 mm

Typical: 450:1, Min. 300:1

8 language

/5400°K / User R,G,B

AC Power range 90 V ~ 264 V, 50 Hz / 60 Hz
Power consumption < 48W green / < 3W amber

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(On / O

ff mode)

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3. Front Panel Function Control Description

Temporarily silence
audio output

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

Scrolls through menu options and
adjusts the displayed control.
Also a shortcut to display the
Contrast adjustment control screen.

Power light
Green = ON
Orange=power

Power On / Off

Decreases or
increases volume

Displays the control screen for the
highlighted control. Also toggles
between two controls on some screens.
Also a shortcut to auto image adjust

Main Menu
With On V i ew controls

Front Control Panel
shown below in detail

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Main Menu Controls

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

B. Contrast adjusts the difference between the image background (black level) and the foreground (white

level).

C. Brightness adjusts the lamps current to control the screen brightness.
D. Audio Menu

controls are explained below:

Volume increases the volume, decreases the volume, and mutes the audio.

Mute temporarily silences audio output.
E. Color Adjust

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

9300K — Adds blue to the screen image for cooler white (used in most office settings with fluorescent

lighting).
5400K — Adds red to the screen image for warmer white and richer red.
Custom User Color — Individual adjustments for red, green, and blue.
1 To select color (R, G or B) press button [2].

2 To adjust selected color, press or .
3 When you are finished making all color adjustments, press button [1] twice.

F. Information displays the timing mode (v ideo 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). VESA 1280 x 1024 @ 60 Hz (recommended) means that the resolution is 1280 x 1024 and the
refresh rate is 60 Hertz.

G. Manual Image Adjust

H. Size (Horizontal Size) adjusts the width of the screen image.
NOTE: Vertical size is automatic with your LCD display.
H./V. Position adjusts horizontal and vertical position of the screen image. You can toggle between

Horizontal and Vertical by pressing button [2]. Horizontal moves the screen image to the left or to the right.
Vertical moves the screen image up and down.

Fine Tune sharpens focus by aligning the illuminated text and/or graphic characters.

Sharpness adjusts the clarity and focus of the screen image.
Setup Menu controls are explained below:
Language allows you to choose the language used in the menus and control screens.
Resolution Notice displays the recommended resolution for this LCD display.
Enable allows the Resolution Notice to appear on-screen.
Disable will not allow the Resolution Notice to appear on-screen.
OSD Timeout sets the length of time an on-screen disp lay screen is displayed. For example, with a“15

H. OSD Position allows you to move the on-screen display menus and control screens.

I. M emory Recall

Preset Timing Mode listed in this user guide.

provides several color options: preset color temperatures and Custom User Color which allows

controls are explained below:

second” setting, if a control is not pushed within 15 seconds, the display OSD
disappears.

returns adjustments to the original factory settings if the display is operating in a factory

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L

N

N

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N

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A

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4. Circuit Description

4-1. Outline

1.1 POWER On/Off , LED, Button"2" , Up arrow- button , Down arrow button , Button"1" , button , Down

arrow button , Button"1" , on the front panel.

1.2 Video signal connector, audio line-in receptacle and DC-IN are located on the back si de of the cabinet.

1.3 OSD menu includes the following function;

AUTO IMAGE ADJUST
CONTRAST / BRIGHTNESS
AUDIO MENU
COLOR ADJUST
INFORMATION
MANUAL IMAGE ADJUST
SETUP MENU
MEMORY RECALL

1.4 CONTRAST and BRIGHTNESS can be directly controlled with UP / DN key.

1.5 Speaker out can be controlled with + / - volume key and MUTE key.

4-2. CONNECTORS

2.1 AC inlet : CEE22 typed connector

2.2 Audio : Line-in receptacle

J1

PHONEJACK STEREO

2.3 Video signal connector 15P Mini D-Sub

1

3

6

7

16

2

12

13

11

1

2

3

CN6

9

4

8

5

10

DB15HD

17

PIN

15

14

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

MNEMONI SIGNA
RV

GV

BV

C

GND

RG

GG

BG

+5V

SG

C

SD

HS

VS

SC

Red Video

Green Video

Blue Video

one

Ground(DDC return

Red GND

Green GND

Blue GND

+ 5V (for DDC

Sync GND

one

DDC Data

Horizontal Sync

Vertical Sync
DDC Clock

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4-3. ELECTRICAL SPECIFICATIONS

3.1 Standard cond itions

Display area 338 x 270
Video s ignal 0.7 Vpp
Contrast Max.
Bri ghtness Max.
Am bient 20 +/- 5 C
Input AC
Warming up > 30
Display 1280 x1024

3.2 POWER

3.2.1 Power supply

Input volta ge
Power frequency
Input current

Inrush current
Power consumption
Output V oltage

3.2.2 Power Management

90~240 Volts
50 / 60 Hz, +/-3 Hz
< 1.5 Arms @ 90Vac
< 0.75Arms @265Vac
90A(Max) at 230Vac
48W(Max)
@0-4.8A L oad 12Vdc+/- 5%

State Power Indicator

On 48Watts Green

Standby <3Watts Amber

Off <3Watts None

3.3 Acceptable timing

If your timing is within following specification, this LCD display can automatically function with a certain

position.

Horizontal: Sync frequency: 30~81 kHz

Vertical: Sync frequency: 56~75Hz

3.4 Signal level and input impedance

3.4.1 Video Signal level This LCD display is adjusted at the factory using 0, 7 Vp-p Video signal.

3.4.2 Sync Signal level

H/V Separate: TTL level

3.4.3 Input impedance
Video input: 75 ohms
Sync input: > 1 k ohms

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State Power Indicator

On 48Watts Green

Standby <3Watts Amber

Off <3Watts None

4-4. SIGNAL CABLE: Signal cable with Mini D-Sub 15P connectors at both ends. Length: 1.8 meter.

EDID data

4-5 .

Analog EDID

Time: 09:08:54
Date: Wed Sep 04, 2002
______________________________________________________________________
______________________________________________________________________

VIEWSONIC CORPORATION

EDID Version # 1, Revision # 3

DDCTest For: VSC VG700b-2

______________________________________________________________________

______________________________________________________________________
60 | 2A 40 30 70 13 00 52 0E 11 00
70 | 00 1E 00 00 00 FF 00 41 31 4B
80 | 30 33 30 31 30 30 30 30
90 | 00 00 00 FD 00 32 4B 1E
100 | 00 0A 20 20 20 20 20 20
110 | 00 FC 00 56 47 37 30 30

31

52

00

62
120 | 32 0A 20 20 20 20 00 86
_________________________________________________ ___________________

(08-09) ID Manufacturer Name = VSC
(10-11) Product ID Code (Non-Alphanumerical) = B50B - (46347)
(12-15) Last 5 Digits of Serial Number = NOT SPECIFIED
(16) Week of Manufacture = 01
(17) Year of Manufacture = 2003
(10-17) Complete Serial Number = NOT SPECIFIED
(18) EDID Structure Version Number = 1
(19) EDID Structure Revision Number = 3
(20) VIDEO INPUT DEFINITION : =
Separate Sync, Analog signal, 0.700V/0.300V (1.000 Vp-p)

0A

0

00
2D

E

(21) Maximum Horizontal Image Size = 340mm
(22) Maximum Vertical Image Size = 270mm
(23) Display Gamma = 2.20
(24) DPMS Supported Feature: = Active Off.
Display type = RGB color display

(25-34) CHROMA INFO:
Red x = 0.633 Green x = 0.300 Blue x = 0.146 White x = 0.313
Red y = 0.336 Green y = 0.586 Blue y = 0.103 White y = 0.329

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(35) ESTABLISHED TIMING I:
720 x 400 @ 70Hz (VGA, IBM)
640 x 480 @ 60Hz (MAC II, Apple)
640 x 480 @ 67Hz (VESA)
640 x 480 @ 72Hz (VESA)
640 x 480 @ 75Hz (VESA)
800 x 600 @ 56Hz (VESA)
800 x 600 @ 60Hz (VESA)

(36) ESTABLISHED TIMING II:
800 x 600 @ 72Hz (VESA)
800 x 600 @ 75Hz (VESA)
832 x 624 @ 75Hz (MAC II, Apple)
1024 x 768 @ 60Hz (VESA)
1024 x 768 @ 70Hz (VESA)
1024 x 768 @ 75Hz (VESA)
1280 x 1024 @ 75Hz (VESA)

(37) Manufacturer's Reserved Timing:
1152 x 870 @ 75Hz (MAC II, Apple)

(38-53) Standard Timing Identification:
#1: 1280 x 1024 @ 60Hz
#2: (40) not specified
#3: (42) not specified
#4: (44) not specified
#5: (46) not specified
#6: (48) not specified
#7: (50) not specified
#8: (52) not specified

(54-71) Detail Timing Description #1: 1280x1024 Pixel Clock=108.0MHz

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Horizontal Image Size=338mm Vertical Image Size=270mm
Refresh Mode: Non-Interlaced Normal display, no stereo

HORIZONTAL:
Active Time = 1280 pixels Blanking Time = 408 pixels
Sync Offset = 48 pixels Sync Pulse Width = 112 pixels
Border = 1 pixels Frequency = 64.0 kHz

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