ViewSonic VA1703w, VA1703wb, VS11668 Schematic

Service Manual

ViewSonic VA1703w/VA1703wb

Model No VS11668

17” Color TFT LCD Display

Manufacture Date: Jan-09-07

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Copyright Information

Copyright © ViewSonic
Macintosh and Power Macintosh are registered trademarks of Apple Computer, Inc.
Microsoft, Windows, Windows NT, and the Windows logo are registered trademarks of
Microsoft Corporation in the United States and other countries.
ViewSonic, the three birds logo, OnView, ViewMatch, and ViewMeter are registered
trademarks of ViewSonic Corporation.
VESA is a registered trademark of the Video Electronics Standards Association. DPMS
and DDC are trademarks of VESA.

ENERGY STAR
(EPA). As an ENERGY STAR
product meets the ENERGY STAR

Disclaimer: ViewSonic Corporation shall not be liable for technical or editorial errors or
omissions contained herein; nor for incidental or consequential damages resulting from
furnishing this material, or the performance or use of this product.
In the interest of continuing product improvement, ViewSonic Corporation reserves the
right to change product specifications without notice. Information in this document may
change without notice.
No part of this document may be copied, reproduced, or transmitted by any means, for any
purpose without prior written permission from ViewSonic Corporation.

Copyright © ViewSonic
may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into

any language or manual or otherwise, without the prior written permission of ViewSonic
Corporation.

®

Corporation, 2006. All rights reserved.

®

is a registered trademark of the U.S. Environmental Protection Agency

®

partner, ViewSonic Corporation has determined that this

®

guidelines for energy efficiency.

®

Corporation, 2006. All rights reserved. No part of this publication

®

Revision History

Revision Date Description of changes Approval

A00 Jan-09-07 Initial Release YG.WANG

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TABLE OF CONTENTS

1. Precautions And Safety Notices 4

2. Specification 7

3. Front Panel Control And Indicators 9

4. Circuit Description 15

5. Adjustment Procedure 23

6. Troubleshooting Flow Chart 42

7. Recommended Spare Parts List 43

8. Exploded Diagram And Spare Parts List 54

9. Disassemble Process 58

10. Block Diagram 62

11. Schematic Diagram 63

12. PCB Layout Diagram 71

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1. Precautions And Safety Notices

1.1 SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user’s safety comes
first. However, improper use or installation may cause damage to the monitor as well as
the user. Carefully go over the following WARNINGS before installing and keep this guide
handy.

WARNINGS

．This monitor should be operated only at the correct power sources indicated on the label

on the rear end of the monitor. If you’re unsure of the power supply in your residence,
consult you local dealer or power company.

．Use only the special power adapter that comes with this monitor for power input.

．Do not try to repair the monitor your self as it contains no user-serviceable parts. This

monitor should only be repaired by a qualified technician.

．Do not remove the monitor cabinet. There is high-voltage parts inside that may cause

electric shock to human bodies, even when the power cord is unplugged.

．Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
．Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable

immediately and consult your service technician.

．Always unplug the monitor before cleaning it .Clean the cabinet with a clean, dry cloth.

Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.

．Keep the monitor away from magnetic objects, motors, TV sets, and transformer.
．Do not place heavy objects on the monitor or power cord.

1.2 PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections
and the protection afforded by them cannot necessarily be obtained by using replacement
components rated for higher voltages, wattage, etc. Before replacing any of these
components read the parts list in this manual carefully. The use of substitute replacement
parts which do not have the same safety characteristics as specified in the parts list may
create shock, fire ,or other hazards.

1.3 SERVICE NOTES

1. When replacing parts or circuit boards, clamp the lead wires around terminals before
soldering.

2. When replacing a high wattage resistor(more than 1W of metal oxide film resistor) in
circuit board, keep the resistor about 5mm away from circuit board.

3. Keep wires away from high voltage, high temperature components and sharp edges.

4. Keep wires in their original position so as to reduce interference.

5. Usage of this product please refer to also user’s manual.

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1.4 HANDING AND PLACING METHODS

Correct Methods: Incorrect Methods:

Only touch the metal frame of the LCD
panel or the front cover of the monitor. Do
not touch the surface of the polarizer.

Surface of the LCD panel is pressed by fingers
and that may cause “Mura.”

Take out the monitor with cushions

Place the monitor on a clean and soft foam
pad.

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Taking out the monitor by grasping the LCD
panel. That may cause “Mura.”

Placing the monitor on foreign objects. That
could scratch the surface of the panel or cause
“Mura.”

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Place the monitor on the lap, the panel
surface must be upwards.

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The panel is placed facedown on the lap. That
may cause “Mura.”

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2. Specification

2.1 PRODUCT SPECIFICATIONS

LCD

Type

17.0” (full 17” wide viewable diagonal area),
TFT(Thin Film Transistor), WXGA,0255mm pixel pitch

Color Filter RGB vertical stripe

Glass Surface Anti-Glare

Input Signal Video Sync

RGB analog(0.7/1.0 Vp-p, 75ohms)
Separate Sync,
Fh:24-82 kHz, Fv:50-75 Hz

Compatibility PC

Macintosh

Resolution Recommended

and supported

Up to 1440 x 900 Non-interlaced
Power Macintosh up to 1440 x 900

1440 x 900 @ 60, 75 Hz
1280 x 1024 @ 60, 75 Hz
1024 x768 @ 60, 70, 72, 75 Hz
800 x 600 @ 56, 60, 72, 75 Hz
640 x 480 @ 60, 75 Hz
720 x 400 @ 70 Hz

Power Voltage 100V~240 VAC, 50/60Hz (auto switch)

Display area Full Scan

367.2mm(H) x 229.5mm(V)

14.45”(H) x 9.04”(V)

Operating
conditions

Storage
conditions

Temperature
Humidity
Altitude

Temperature
Humidity
Altitude

Dimensions Physical

41°F to + 95°F( 5°C to + 35°C)
20%C to + 80%(non-condensing)
To 10,900 feet

-4°F to + 131°F( -20°C to + 55°C)
20%C to + 85%(non-condensing)
To 40,000 feet

406.7mm(W) x 374.9mm(H) x210mm(D)

15.98”(W) x 14.75”(H) x 8.27”(D)

Weight Physical 7.05 Ib(3.2 kg)

BSMI, CCC, PSB, C-Tick, CE, GS, VCC1,

Regulations

Power saving
modes

On
Off

Ergo, Gost-R/Hygienc, SASO, TCO’03,
UL/cUL, FCC-B, ICES-B, NOM, TUV-S, Energy Star
Normal (green LED)

<1W (orange LED)

®

Preset Timing Mode (pre-adjusted to VESA® 1440 x 900 @ 60 Hz)
Warning: Do not set the graphics card in your computer to exceed these refresh rates;

doing so may result in permanent damage to the LCD display.

1

Macintosh computers older than G3 require a ViewSonic® Macintosh adapter. To order an

adapter, contact ViewSonic.

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2.2 INTERFACE DESCRIPTION

D-SUB 15 PIN CONNECTOR

15

6

11 15

10

SIGNAL LEVEL

Pin Number Pin Function

1 Red video input

2 Green video input

3 Blue video input

4 No Connection

5 Ground

6 Red video ground

7 Green video ground

8 Blue video ground

9 +5V

10 H/V sync ground

11 No co n nection

12 (SDA)

13 Horizontal sync (Composite sync)

14 Vertical sync

15 (SCL)

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3.

Front Panel Function Controls And Indicators

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Do the following to adjust the display setting:

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

NOTE: All OSD menus and adjustment screens disappear automatically after about 15

seconds. This is adjustable through the OSD timeout setting in the setup menu.

2. To select a control to adjust, press ▲or ▼ to scroll up or down in the Main Menu.

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

shown below appears.

The line at the bottom of the screen shows the
current functions of buttons 1 and 2: Exit or
select the Brightness control.

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

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

The following tips may help you optimize your display:

• Adjust the computer's graphics card so that it outputs a 1024 x 768 @ 60Hz video
signal to the LCD display. (Look for instructions on “changing the refresh rate” in the
graphics card's user guide.)

• If necessary, make small adjustments using H. POSITION and V. POSITION until the
screen image is completely visible
should barely touch the illuminated “active area” of the LCD display.)

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. (The black border around the edge of the screen

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Main Menu Controls

Adjust the menu items shown below by using the up

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 adjusts background black level of the screen image.

Color Adjust provides several color adjustment modes, including preset color

temperatures and a User Color mode which allows independent adjustment of
red (R), green (G), and blue (B). The factory setting for this product is 6500K
(6500 Kelvin).

and down buttons.

sRGB-This 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. Enabing the intended. Enabling the sRGB setting
will cause 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-Adds green to the screen image for a darker color.

User Color Individual adjustments for red (R), green (G), and blue (B).

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

2. To adjust selected color, press
Important: 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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▼

and ▲.

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Information displays the timing mode (video signal input) coming from the
graphics card in the computer, the LCD model number, the serial number, and

®

the ViewSonic

website URL. See your graphics card’s user guide for
instructions on changing the resolution and refresh rate (vertical frequency).
NOTE: VESA 1280 x 1024 @ 60Hz (recommended) means that the resolution
is 1024 x 768 and the refresh rate is 60 Hertz.

Manual Image Adjust displays the Manual Image Adjust menu.

H. Size (Horizontal Size) adjusts the width of the screen image.

H./V. Position (Horizontal/Vertical Position) moves the screen image left or

right and up or down.

Fine Tune sharpens the focus by aligning text and/or graphics with pixel
boundaries.

NOTE: Try Auto Image Adjust first.

Sharpness adjusts the clarity and focus of the screen image.

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Setup Menu displays the menu shown below:

Language Select allows the user to choose the language used in the menus
and control screens.

Resolution Notice displays the Resolution Notice menu shown below.

Resolution Notice advises the optimal resolution to use.

OSD Position allows the user to move the OSD menus and control screens.

OSD Timeout sets the length of time the OSD screen is displayed. For

example, with a “15 second” setting, if a control is not pushed within 15
seconds, the display screen disappears.

OSD Background allows the user to turn the OSD background On or Off.

Memory Recall returns the adjustments back to factory settings if the display

is operating in a factory Preset Timing Mode listed in the Specifications of this
manual.

Exception: This control does not affect changes made with the User Color
control, Language Select or Power Lock setting.

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SHORT CUTS FUNCTION FROM THE BUTTONS

[1]

Main Menu

[2]

[▼]

[▲]

[▼] + [▲]

[1] + [2]

Input toggle（Analog or Digital；refer to Appendix D）

Contrast adjust

Contrast adjust

recall both of Contrast and Brightness to default

toggle 720x400 and 640x400 mode when input 720x400
or 640x400 mode

[1] + [▼] + [▲] White Balance (Not shown on user’s guide)

[1] + [▼]

[1] + [▲]

Power Lock

OSD Lock

No signal + [2] + [ ] Burning mode

Signal + [2] + [ ] Factory mode

Remark : All the short cuts function are only available while OSD off

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4. Circuit Description

4.1 LCD MONITOR DESCRIPTION
The LCD MONITOR will contain a Main Board, an Power Board, Key Board which

house the flat panel control logic, brightness control logic and DDC.

Monitor Block Diagram

CCFL Drive.

Power Board

(Include: adapter, inverter)

100V-240V

AC-IN

Key Board

4.2 MAIN BOARD BLOCK FUNCTION DESCRIPTION

The main board contains panel control logic, brightness control logic, DDC and DC

convert DC circuit and so on.

R
G
B
H

V
SDA
SCL

EPROM

Main Board

EPROM

Flat Panel and
CCFL backlight

HOST Computer

PWPC board

TSUM16AK

OSC

RS232 Connector
For white balance
adjustment in factory
mode

Video signal, DDC

Backlight and Panel

Keyboard

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4.3 PWPC BOARD BLOCK FUNCTION DESCRIPTION

PWPC board combines to adapter and inverter, Adapter which commonly consists
of bridge rectifier and filter, start circuit, PWM control circuit, protection circuits and
convert to 12V, 5V DC voltage by input 90V-240V AC voltage that provide power supply
for each chips in the main board and inverter. Inverter is DC TO AC circuit. It changes
the 12v DC of power supply to about 600-800v AC that drives the backlight. It mostly
consists of starting circuit, PWM controller, DC changing circuit, LC surging circuit,
output circuit and protection circuit etc.

AC input

EMI filter

Bridge
Rectifier
and Filter

Transformer

Rectifier
CMOS

Start Circuit
R904, R905,ZD901

PWM

Control IC

Over
Voltage
Protect

Lamp

OSC and
Output
Circuit

DC Convert
Circuit

MOSFET
Q805

Feedback
Circuit

Over
Voltage

PWM
Control IC

ON/OFF
Control

DIM

CN902

5V

12V

ON/OF

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4.4 INTRODUCTION OF IC

TSUM16AK(U401): integrate ADC, OSD, SCALER, MCU, LVDS, convert analog RGB

into digital and room and shrink scaling output to LCD panel.

PIN Function:

Pin Symbol Description

70 SDO SPI flash serial data output; Input w/5V-tolerant
71 CSZ SPI flash chip select; output
72 SCK SPI flash serial select; output
73 SDI SPI flash serial data input; output
65 DDCA_SDA/RS232_TX DDC data for analog interface; 4mA driving

strength/UART transmitter/GPIO; I/O w/5V-tolrant

66 DDCA_SDA/RS232_RX DDC data for analog interface/UART

transmitter/GPIO; Input w/5V-tolrant
19 RST Chip reset; High reset; Input w/5V-tolerant
22 RSTN Chip reset; Low reset; Input w/5W-toerant
11 VCTRL Regulator control; Output
63 HSYNCO Analog HSYNC input
64 VSYNCO Analog VSYNC input
62 REFP Internal ADC top de-coupling pin
61 REFM Internal ADC bottom de-coupling pin
51 REXT

External resistor 390 ohm to AVDD＿ADC
21 PWM1 PWM1; 4mA driving strength; Output
29 PWM0 PWM0; 4mA driving strength; Output

4 BYPASS For External Bypass Capacitor
32 XIN Xin; Crystal Oscillator Input
33 XOUT Xout; Crystal Oscillator Output

44、50、60 AVDD＿ADC

52
34

14、67、95、

103、115

12、68、97、

AVDD＿PLL

AVDD＿MPLL

VDDP Digital Output Power 3.3V

VDDC Digital Core Power 1.8V

ADC Power 3.3V
PLL Power 3.3V
MPLL Power 3.3V

117

AP1084K32LA(U702): DC power convert, used to 5v convert 3.3v.

Pm25LV512A/010A/020/040(U402): The PM25LV010 are 512 Kbit/1 Mbits/2 Mbit/4

Mbit3.0 Volt-only Serial Peripheral Interface(SPI) Flash memories. The devices
are designed to support 33MHz fastest clock rate in the industry in normal read
mode, 100MHz in fast read mode and the bottom 4Kbyte sector into four smaller
1 Kbyte sectors features(except Pm25LV512A), The devices use a single low
voltage, ranging from 2.7 Volt to 3.6 Volt, power supper to perform read, erase
and program operations. The devices can be programmed in standard EPROM
programmers as well.

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Pin Diagram:

PIN Descriptions:

Symbol Type Description

Chip Enable: CE# goes low activates the device’s internal
circuitries for device operation. CE# goes high deselects the

CE# INPUT

device and switches into standby mode to reduce the power
consumption. When the device is not selected, data will not
be accepted via the serial input pin (SI), and the serial
output pin (SO) will remain in a high impedance state.

SO OUTPUT Serial Data Output

Write Protect A hardware program/erase protection for all or
partial of memory array. When the WP# pin is pulled t low,

WP# INPUT

whole or partial of memory array is write protected depends
on the setting of BP2, BP1 and BP0 bits in the Status
Register, When the WP# is pulled high, the devices are not
write protected.

GND Ground

Vcc Device Power Supply

HOLD# INPUT

Hold: Pause serial communication with the master device
without resetting the serial sequence.

SCK INPUT Serial Data Clock

SI INPUT Serial Data Input

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Circuit Diagram

LD7552BPS (IC901): PWM control, high-voltage startup current. The circuit unit has

functions such as over-current protection, over-voltage protection, output short-circuit
protection and etc. The function of each pin and the inside circuit diagram are as
follows:

Pin Name Function

1 GND Ground

Voltage feedback pin (same as the COMP pin in UC384X), By

2 COMP

connecting a photo-coupler to close the control loop and achieve the
regulation

3 VCC Supply voltage pin

4 RT

This pin is to program the switching frequency. By connecting a resistor

to ground to set the switching frequency.
6 NC Unconnected pin
7 VCC Supply voltage pin
8 OUT Gate drive output to drive the external MOSFET

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OZ9938GN(IC801): The OZ9938 is high performance, cost-effective CCFL controller

designed for driving large-size LCD applications requiring 2 to 6 CCFLs.PWM
control, Has such functions as short-voltage protection, Over-voltage protection,
over-current protection and etc. The function of each pin and the circuit diagram
inside are as follows:

PIN Descriptions:

Pin Names Description

1 DRV1 Drive output

2 VDDA Supply voltage input

3 TIMER Timing capacitor to set striking time and shutdown delay time

4 DIM

Analog dimming or Internal LPWM dimming or external PWM pulse
input for dimming function

5 ISEN Current sense feedback

6 VSEN Voltage sense feedback

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7 OVPT Over-voltage/ over-current protection threshold setting pin

8 NC No connection

9 NC No connection

10 ENA ON/OFF control of IC

11 LCT

Timing capacitor to set internal PWM dimming frequency and also a
pin for analog dimming selection

12 SSECMP Capacitor for soft start time and loop compensation

13 CT Timing resistor and capacitor for operation and striking frequency

14 GNDA Ground for analog signals

15 DRV2 Drive output

16 PGND Ground for power paths

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Block Diagram

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5. Adjustment Procedure

5.1 ADJUSTMENT CONDITIONS AND PRECAUTIONS

1. Approximately 30 minutes should be allowed for warm up before proceeding.

2. Adjustments should be undertaken only on those necessary elements since most of them
have been carefully preset at the factory.

3. ESD protection is needed before adjustment.

5.2 MAIN ADJUSTMENTS

NO. FUNCTIONS DESIGNATION

1. White Balance Function Key

2. Geometry Function Key

5.3 ALIGNMENT PROCEDURES

Approximately 30 minutes should be allowed for warm up before proceeding
White-Balance adjustment.

1. Adjust of White Balance

1.)How to do the Chroma-7120 MEM .Channel setting

A、Reference to chroma 7120 user guide
B、Use “ SC” key and “ NEXT” key to modify xyY value and use “ID” key to modify the
TEXT description Following is the procedure to do white-balance adjust

2.)Setting the color temp. You want

A、MEM.CHANNEL9 ( 9300 color):
9300 color temp. parameter is Wx = 0.283 ±0.03;Wy = 0.298 ±0.03;

Y = 260 ±20 cd/m

B、MEM.CHANNEL10 ( 6500 color):

6500 color temp. parameter is Wx = 0.313±0.03;Wy = 0.329 ±0.03;
Y = 220 ±20 cd/m

C、MEM.CHANNEL 11 ( 5400 color):

5400 color temp. parameter is Wx = 0.335±0.03;Wy = 0.350 ±0.03;
Y = 250 ±20 cd/m

D、MEM.CHANNEL10 ( SRGB color):

SRGB color temp. parameter is Wx = 0.313±0.03;Wy = 0.329 ±0.03;
Y = 260 ±20 cd/m

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2 ,

2,

2,

2,

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