ViewSonic E70-3 Manuale utente

VIDE-V26045

Service

Manual

ViewSonic

E70-3

Model

No.

VCDTS21569-3

17”

pigitat

Controlled

Color

Monitor

Series

ev.

1—

March

2000

ViewSonic®

381

Brea

Canyon

Road,

Walnut,

California

91789

USA

(800)

888-8583

1998

ViewSonic

Corporation.

All

rights

reserved.

part

this

publication

may

reproduced,

transmitted,

transcribed,

stored

retrieval

system,

translated

into

any

language

computer

language,

any

form

any

means,

electronic,

mechanical,

magnetic,

optical,

chemical,

manual

otherwise,

without

the

prior

written

permission

ViewSonic

Corporation.

Disclaimer

ViewSonic

makes

representations

warranties,

either

expressed

implied,

with

respect

the

contents

hereof

and

specifically

disclaims

any

warranty

merchantability

fitness

for

any

particular

purpose.

Further,

ViewSonic

reserves

the

right

revise

this

publication

and

make

changes

from

time

the

contents

hereof

without

obligation

ViewSonic

notify

any

person

such

revision

changes.

Trademarks

ViewSonic

registered

trademark

ViewSonic

Corporation.

All

other

trademarks

used

within

this

document

are

the

property

their

respective

owners.

Revision

History

Description

Changes

Approval

3/10/00

Initial

Issue

Sears

E70-3

Service

Manual

1998

ViewSonic

Corporation.

All

rights

reserved.

part

this

publication

may

reproduced,

transmitted,

transcribed,

stored

retrieval

system,

translated

into

any

language

computer

language,

any

form

any

means,

electronic,

mechanical,

magnetic,

optical,

chemical,

manual

otherwise,

without

the

prior

written

permission

ViewSonic

Corporation.

Disclaimer

ViewSonic

makes

representations

warranties,

either

expressed

implied,

with

respect

the

contents

hereof

and

specifically

disclaims

any

warranty

merchantability

fitness

for

any

particular

purpose.

Further,

ViewSonic

reserves

the

right

revise

this

publication

and

make

changes

from

time

the

contents

hereof

without

obligation

ViewSonic

notify

any

person

such

revision

changes.

Trademarks

ViewSonic

registered

trademark

ViewSonic

Corporation.

All

other

trademarks

used

within

this

document

are

the

property

their

respective

owners.

Revision

History

Description

Changes

Approval

3/10/00

Initial

Issue

Sears

E70-3

Service

Manual

TABLE

CONTENTS

T-

PRECAUTIONS:

AND

SAFETY

NOTICES.

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SERVICE

TOOLS

EQUIPMENT

REQUIRED.

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-23~24

PINELECT

RICA

PARTS

LIST

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E70-3

Service

Mangal

E70-3

Service

Manual

PRECAUTION

AND

NOTICES

1.1.

SAFETY

PRECAUTIONS

Observe

all

caution

and

safety

notes

located

inside

the

display

cabinet.

Operation

the

display

with

the

cover

removed,

may

cause

serious,

shock

hazard

from

the

display

power

supply.

Work

the

display

should

not

attempted

anyone

who

not

thoroughly

familiar

with

the

necessary

precautions

when

working

high

voltage

equipment.

not

install,

remove

handle

the

picture

tube

any

manner

unless

shatter-proof

goggles

are

worn.

people

who

are

not

equipped

should

kept

away

while

handling

picture

tube.

Keep

picture

tube

away

from

the

body

while

handling.

The

picture

tube

constructed

limit

X-RAY

radiation

0.5

mR/HR.

For

continued

protection,

use

the

designated

replacement

tube

only,

and

adjust

the

voltages

that

the

designated

maximum

rating

the

anode

will

not

exceeded.

Before

returning

serviced

display

the

customer,

thorough

safety

test

must

performed

verify

that

the

display

safe

operate

without

danger

shock.

Always

perform

leakage

current

check

the

exposed

metallic

parts

the

cabinet,

such

screw

heads.

Test

method

for

current

leakage

described

follow.

(a)

Plug

the

line

cord

directly

into

rated

outlet

(do

not

use

line

isolation

transformer

during

this

check).

(b)

Use

voltmeter

having

5000

ohms

per

volt

with

sensitivity

the

following

manner:

Connect

1500

ohms

Watt

resistor,

paralleled

0.15mfd,AC

type

capacitor

between

known

good

earth

ground

(water

pipe,

conduit,

etc.)

and

the

exposed

metallic

parts

simultaneously.

Measure

the

voltage

across

the

combination

1500

ohms

resistor

and

0.15mfd

capacitor.

(c)

Reverse

the

plug

the

outlet

and

repeat

voltage

measurements

for

each

exposed

metallic

part.

(d)

Voltage

measured

must

not

exceed

2.8

volts

RMS.

This

corresponds

milliamp

AC.

Any

value

exceeding

this

limit

constitutes

potential

shock

hazard

and

must

corrected

immediately.

1.2.

PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

parts

this

chassis

have

special

safety

visual

inspections

and

the

protection

afforded

them

cannot

necessarily

obtained

using

replacement

components

rated

for

higher

voltages,

wattage,

etc.

Before

replacing

any

these

components

read

the

parts

list

this

manual

carefully.

The

use

substitute

replacement

parts

which

not

have

the

same

safety

characteristics

specified

the

parts

list

may

create

shock,

fire,

X-RAY

radiation

other

hazards.

epee

ViewSonic

Corporation

1/17/2000

E70-3

Service

Manual

1.3.

SERVICE

NOTES

When

replacing

parts

circuit

boards,

clamp

the

lead

wires

around

terminals

before

soldering.

;

When

replacing

high

wattage

resistor

(more

than

metal

oxide

film

resistor)

circuit

board,

keep

the

resistor

about

5mm

away

from

circuit

board.

Keep

wires

away

from

high

voltage,

high

temperature

components

and

sharp

edges.

Keep

wires

their

original

position

reduce

interference.

Usage

this

product

please

refer

also

user's

manual.

1.4.

HIGH

VOLTAGE

WARNING

Operation

monitor

outside

cabinet

with

back

removed

may

cause

serious

shock

hazard.

Work

these

models

should

only

performed

those

who

are

thoroughly

familiar

with

precautions

necessary

when

working

high

voltage

equipment.

Exercise

care

when

servicing

this

chassis

with

power

applied.

Many

plus

and

high

voltage

terminals

are

exposed

which,

carelessly

contacted,

can

cause

serious

shock

result

damage

the

chassis.

Maintain

interconnection

ground

lead

connections

between

chassis

and

picture

tube

dag

when

operating

chassis.

Certain

failures

can

increase

X-ray

radiation.

Monitor

should

not

operated

with

levels

exceeding

the

specified

rating

for

the

chassis

type.

The

maximum

operating

specified

for

the

chassis

used

this

monitor

25.5KV+t

I1KV

with

line

voltage

120/240V

AC.

Higher

voltage

may

also

increase

possibility

failure

Supply.

important

maintain

specified

values

all

components

the

horizontal

and

high

voltage

circuits

and

anywhere

else

the

monitor

that

could

cause

rise

high

voltage

operating

supply

voltages.

changes

should

made

the

original

design

the

monitor.

Components

shown

the

shaded

areas

the

schematic

should

replaced

with

exact

factory

replacement

parts.

The

use

unauthorized

substitute

parts

may

create

shock,

fire

other

hazard.

determine

the

presence

high

voltage,

use

accurate,

high

impedance,

meter

connected

between

second

anode

lead

and

CRT

dag

grounding

device.

When

servicing

the

High

Voltage

System,

remove

static

charge

from

connecting

10K

ohm

resistor

series

with

insulated

wire(such

test

probe)

between

picture

tube

dag

and

2nd

anode

lead.

(AC

line

cord

disconnected

from

power

outlet).

The

picture

tube

used

this

monitor

employs

integral

implosion

protection.

Replace

with

tube

the

same

type

number

for

continued

safety.

not

lift

picture

tube

the

neck.

Handle

the

picture

tube

only

after

discharging

the

high

voltage

completely.

-2-

1/17/2000

fiewSonic

Corporation

Confidential

Not

Copy

E70-3

Service

Manual

SERVICE

TOOL

EQUIPMENT

REQUIRED

MULTIMETER

OSCILLOSCOPE

SCREW

DRIVER

IRON

ABSORBER

SOLDER

SPECIFICATIONS

3.1.

PRODUCT

SPECIFICATIONS

CRT:

Size:

Viewable

Size:

Dot

Pitch:

Deflection:

DISPLAY:

Size:

Diagonal

Size:

Color:

Resolution:

Pixel

Rate:

INPUT

SIGNAL:

Video

Signal:

Sync.

Signal:

Scanning

Freq.:

POWER

SOURCE:

Power

Supply:

Power

Consumption:

POWER

MANAGEMENT

Inch

Diagonal

Flat

Square

Type

15.6

Inch

(Diagonal)

0.27/0.25

(Optional!)

90°

Degree

300mm

225mm

398mm

Unlimited

Colors

1280

1024

110MHz

RGB

Analogue

0.7Vpp

Ohms

H/V.

Separated,

TTL.

Level

Positive

Negative.

KHz

for

Horizontal

120

for

Vertical

100-240V,

60Hz/50Hz.

100W

Max.

The

Power

Management

states

are

controlled

the

presence

and/or

absence

horizontal

and

vertical

sync

signals

according

the

following:

STATE

Sync

Power

(normal)

LED

100WATTS

GREEN

ISWATTS

ORANGE

ISWATTS

ORANGE

3WATTS

ORANGE

STANDBY

OFF

SUSPEND

OFF

-3-

1/17/2000

Confidential

Not

Copy

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ree

eee

teens,

‘iewSonic

Corporation

E70-3

Service

Manual

3.2.

FACTORY

PRESET

MODE

TIMING

CHART

UNIT

ESA

VGA

VESA_

VESA

|__|

Resolution

1024x768

640x400

640x480

800x600

|_|

MHz

Syne

ors

eee

WeSyne.

Poletity/<-=

Horizontal

Period

Horizontal

Syne

Width

2.032

1.556

1.616

usec

jas]

° 3

)

av)

ale

(FRR

(ane

eres

eae

See)

75.000

Vertical

Sync

Width

0.050

0.064

0.080

0.069

0.064

msec

0.466

1.112

0.427

0.578

0.448

msec

12.795

12.711

12.800

[11.093

12.800

msec

nterlaced

Vertical

Period

13.328

14.268

13.333 11.764

13.333

msec

I<I<i<

|;|e

reaina

Qiaiao

She

ie?)

Sates

s.190

Bla

|®

[ro

e|<|s

ie}

MODE

VESA_|

VESA_

VESA_[

VESA_|

MAC

|__|

800x600

1024x768

|1280x1024|

640x480

|_|

Sync

Polari

Sync.

Polari

]

ca.)

[=]

fo}

63.981

35.00

Horizontal

Period

Horizontal

Sync

Width

1.138__|

2.092

1.016

[1.037

[2.116

[usec

|_2.702

2.462

2.201

2.296

3.174

[usec

fen] fea)

jes)

o}1o

fet.

NIN

o1o

Bis

eiec

EES

ie?)

ome

o./2.

|rg

SIS

|e]

Oley

14.222

10.836

Horizontal

Front

Porch__|

poszonal

Font

Porch

0.565

1.369

_}_oso8

{

aatd

{2.16

fuse

SERET

Vertical

Sync

Width

msec

0.503

0.599

0.524

0.594

msec

11.179

15.880

11.183

[716.005

13.714

msec

nterlaced

No_

[Noy

<<<

aja

sidid

alala

Ses

ie)

a.ja

ARE

————

-4-

1/17/2000

tee

mew

wee

eer

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wee

wera

ViewSonic

Corporation

E70-3

Service

Manual

[_"MODENO|

112]

SYS—S

Ree

MAC

MAG

Resolution

832x624

[

1024x768]

Pixel

37.283

80.000

+| «|

ered

Syn

Polanity\

lft

Horizontal

Frequency

_—|

49.725

60.241

Horizontal

Period

20.111

16.6

Tec

Horizontal

Syne

Width

N17

see

Horizontal

Back

Porch

—|_

3.910

2.2

usec

Horizontal

Active

Video

14.525

128

usec

Horizontal

Front

Porch

0.559

sec

Vertical

Frequency

74.534

74.927

Vertical

Period

13.414

13.346

[TT

msec

Vertical

Syne

Width

0.060

0.05

Tse

Vertical

Back

Porch

0.784

0.498

sec

Vertical

Active

Video

12.549

12.749

[Tse

ferdeal

Front

Porch

002

{0.05

__}___|__T

msec

Interlaced

3.3.

D-SUB

CONNECTOR

D-SUB

CONNECTOR

1.R

6.GND

11.GND

2.G

7.GND

12.SDA

Sige

3.B

8.GND

13.H.SYNC

41°

120«13«

4415

° °

4.GND

9.NC

14.V.SYNC

5.NC

10.GND

15.SCL

SIGNAL

LEVEL

aaa

E'S

-5-

1/17/2000

iewSonic

Corporation

scontidental-

Done

Cop

1/17/2000

MAIN

PCB

ASS'Y

Ss)

ULTLELELS

(E70-3)

4.1.

EXPLODED

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Corporation

Confidential

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