ViewSonic ViewPanel VP181 Manuale utente

Service

Manual

Viewsonic

VP181

Model

No.

VLCDS21535-1

18”

Color

TFT

LCD

Display

ev.

—

February

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

2/17/00

__|

Initial

Issue

ene

SOs

VP181

Service

Manual

TABLE

CONTENTS

WARNINGS

SAFETY

PRECAUPIONG

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dicts

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3~20

ROP

ANE

TROLS

245:

nla

tonuihie

saith

iat

nce ett

tes

tty

21~25

EIRCUPUDES

COR

IeION

cas

asccisscsty

suet

tyiente

iol

cept

iced

sacs

aii

hoial

tact

eethel

lota

aos

26~39

TROUBLESHOOTING

WAVEFORMS

..........ssssscssssssesssssscessseseecssessssstsactesesesussussusesssoseeseccccccce,

40~81

ADJUSTMENT

PROCEDURE

35526

csasese(eAinusac'sectecs

anscrzaesceardeletotal

lutheran

nope

82~86

MECHANICAL

ASSEN

cdoosiuss

cai

scaicansupeouteidsshesadte

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aihol

ieee

eiaeoiccte

87~92

RECOMMENDED

SERVICE

APRTS

LIST...

essessessssssssesssscsssssssussersussssussscssesssspesssesseeeeeeesecccccs

93~97

BLOCK

CIRCUIT

DIAGRAMS

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98~112

iii

VP181

Service

Manual

/\,

WARNING

This

service

information

designed

for

experienced

repair

technicians

only

and

not

designed

for

use

the

general

public.

does

not

contain

warnings

cautions

advise

non-technical

individuals

potential

dangers

attempting

service

product.

Products

powered

electricity

should

serviced

repaired

only

experienced

professional

technicians.

Any

attempt

service

repair

the

product

products

dealt

within

this

service

information

anyone

else

could

result

serious

injury

death.

ViewSonic

Corporation

{

Confidential

Not

Copy

CAUTION

modification

any

circuit

should

attempted.

Service

work

should

only

performed

after

you

are

thoroughly

familiar

with

all

the

following

safety

checks

and

servicing

guide

lines.

SAFETY

CHECK

Care

should

taken

while

servicing

this

CRT

display

because

the

high

voltage

used

the

deflection

circuits.

These

voltages

are

exposed

such

areas

the

associated

flyback

and

yoke

circuits.

FIRE

SHOCK

HAZARD

3-1

Insert

isolation

transformer

between

the

CRT

display

and

power

line

before

servicing

the

chassis.

servicing

pay

attention

original

lead

dress

especially

the

high

voltage

circuit.

short

circuit

found,

replace

all

parts

which

have

been

overheated

result

the

short

circuit.

All

the

protective

devices

munt

reinstalled

per

original

design.

Soldering

must

inspected

for

possible

cold

solder

joints,

frayed

leads,

damaged

insulation,

solder

splashes

sharp

solder

points.

certain

remove

all

foreign

material.

3-2

LEAKAGE

CURRENT

COLD

CHECK

Unplug

the

cord

and

connect

jumper

between

the

two

prongs

the

plug.

4-2

Turn

the

CRT

display

power

switch

“on”.

4-3

Measure

the

resistance

value

with

ohmmeter

between

the

jumpered

piug

and

each

exposed

metailic

part

the

CRT

display

such

the

metal

frame,

screwheads,

control

shafts,

etc.

When

the

exposed

metallic

part

has

return

path

the

chassis,

the

reading

should

1.8

megohm

minimum.

4-1

LEAKAGE

CURRENT

HOT

CHECK

5-1

Plug

the

cord

directly

into

the

outlet.

not

use

isolation

transformer

during

this

check.

5-2

Connect

1500

ohm,

watt

resistor,

paralleled

0.15uF

capacitor

between

each

exposed

metallic

part

and

good

earth

ground(as

shown

Fig.1).

5-3

Use

voltmeter

with

1000

ohm/volt

Sensitivity

and

measure

the

voltage

across

the

combination

1500

ohm

resistor

and

0.15uF

capacitor.

5-4

Move

the

resistor

connection

each

exposed

metallic

Part

and

measure

the

voltage.

5-5

Reverse

the

polarity

the

plug

the

outlet

and

repeat

the

above

measurement.

5-6

Voltage

measured

must

not

exceed

7.5

volt

RMS,

from

any

exposed

metallic

part

ground

leakage

current

tester

may

used

the

above

hot

check,

which

case

any

current

measured

must

not

exceed

5.0

milliamp.

the

case

measurement

exceeding

the

5.0

milliamp

value,

rework

required

eliminate

the

chance

shock

hazard.

ViewSonic

Corporation

SAFETY

PRECAUTIONS

Note:

High

voltage

present

when

this

CRT

display

operating.

Always

discharge

the

anode

the

picture

tube

the

display

chassis

prevent

shock

hazard.

VOLTMETER

15002,

10W

Fig.

IMPLOSION

PROTECTION

Picture

tubes

are

equipped

with

integral

implosion

protection

system,

but

care

should

taken

avoid

damage

and

scratching

during

installation.

X-RADIATION

WARNING

The

only

potential

source

X-Radiation

the

picture

tube.

However

when

the

high

voltage

circuit

operating

properly

there

possibility

X-

Radiation

problem.

The

basic

precaution

which

must

exercised

keep

the

high

voltage

the

following

factory-

recommended

level.

Note:

important

use

accurate

periodically

calibrated

high

voltage

meter.

7-2

high

voltage

cannot

set

24kV,

immediate

service

required

prevent

the

possibiity

premature

component

failure.

7-3

prevent

X-Radiation

possibility

essentialio

use

the

specified

picture

tube.

IMPORTANT

SAFETY

NOTICE

There

are

special

components

used

this

CRT

displays

which

are

important

for

safety.

Thes:

parts

are

identified

the

international

symbd

‘\

the

schematic

diagram

and

th:

replacement

parts

list.

essential

that

thes:

critical

parts

should

replaced

with

manufacture’s

specified

parts

prevent

RADIATION,

shock,

fire,

or.other

hazards.

not

modify

the

original

design

this

will

voit

the

original

parts

and

labor

guarantee.

xa.

Confidential

Not

Copy

Section

Engineering

Specifications

Scope

The

following

specifications

are

applicable

model

VP181,

inch

color

LCD

monitor.

359.0

287.2

(typical)

Pixel

Pitch

0.281

Resolution

1024

768

dot

(XGA)

Brightness

200

(min.)

Contrast

Ratio

200:1(min.)

Color

16,777,216

Viewing

Angle

60°

Down

60°(min.)

Left

60°

Right

60°(min.)

CR>10:1

Analog

0.7

Vp-p

750

Positive

Polarity

Separate

sync.

TTL

level

Composite

sync

Digital

TMDS

(Panel

Link).

Video:

NTSC,

PAL,SECAM

kHz

(automatically)

Vertical

(automatically)

Non-interlaced

Max

Pixel

Rated

210Mhz

Horizontal

1280

dots

Vertical

1024

lines

Horizontal

359.0

(typical)

Vertical

287.2

(typical)

(Active

display

area

dependent

upon

signal

timings)

adapter

input

AC90V-264V

50/60

input

12V

70W

mode

including

USB

less

than

12W

Suspend,

Standby

mode

less

than

Off

mode(

input

signal

)

Current

Rating

{AC

input

1.0A

@AC

100-240V

fecemeree

lee

input

@DC

12.0V

445

(W)

459

(H)

243

(D)

Gross

514

(W)

616

(H)

315

(D)

Depth(head

only)

100.5mm

ViewSonic

Corporation

VP181

CONFIDENTIAL

NOT

COPY

Operating

Temperature

40°C

Operating

Humidity

80%

Storage

Temperature

-20

60°C(max.

temp

29%RH)

Storage

Humidity

85%

cord

with

Power

Supply

USB

Upstream

Cable

base

host

Analog

VGA

cable

1.8m

3.5mm

Stereo

Mini

3.5mm

Stereo

Mini

Cable

3.5mm

Stereo

Mini

Dual

RCA

Cable

RCA

composite

Video

Cable

Viewsonic

CDRom

Environmental

Conditions

Accessories

,ISO

CE,

DOC-

EPA,

NOM,

TUVIGS,

TUV/ERGO,

MPRII,

TCO99,

E2000

NEMKO,DEMKO,

SEMKO,FIMKO,Estonia,

Lithuania,

PCT,

SASO,

Africa,

VCCI,

BCIQ,

CCIB,

S-Mark,

C-Tick,

User

Control

Screen

Display(

base

only

)

VESA

DDC1/2B

compatible

(

head

DDC2B

only)

Cabinet

Material

GP7351

Color

code

Y0487

ViewS

onic

Corporation

VP181

CONFIDENTIAL

—-

NOT

COPY

Electrical

Characteristics

Power

Supply

3.1.1

Input

(AC

Adapter)

Input

Voltage

Frequency

Power

Consumption:

65W

(typ)

less

than

Current

Rating

3.1.2

Input

Voltage

Current

Rating

3.2

LCD

Effective

display

size

Pixel

number

Color

filter

arrangement

Display

method

Drive

method

Dot

pitch

Pixel

pitch

Dot

number

Backlight

Brightness

Contrast

ratio

Display

color

Minimum

viewing

angle

Response

time

3.3

Interface

Signals

AC90-264V

63Hz

mode

power

save

mode

1.0A

AC100-240V

5.0A

In-Plane

Switch

Active

matrix

(TFT)

359.0

(H)

287.2

(V)

(typ)

18.1”

diagonal

1280

1024

pixels

R.G.B.

vertical

stripe

TFT,

normally

black

In-Plane

Switch

Active

matrix

(TFT)

0.092

(H)

0.281

(V)

0.281

(H)

0.281

(V)

1280

1024

dots

Edge-lighting

type

with

CCFTs

(Cold

Cathode

Fluorescent

Tube)

200

(min:

center

all

white)

200:1

(min)

16,777,216

60°

down

60°

right

60°

left

60°

(Contrast

ratio>10

Ta=25°C,

77°F)

msec

(Typical)

3.3.1

RGB

Video

Signals

3.3.1.1

Separate

Sync

Signals

Analog

R,G,B

-0.7

Vp-p

Signal

Level

+5%

Sync

Level

TTL

level

Sync

Polarity

independent

3.3.1.2

Sync

green(serrated

XGA

only),

Composite

Sync

3.3.2

Composite

Video

Signals

3.3.2.1

Video

type

NTSC,

PAL,SECAM

ViewSonic

Corporation

181

CONFIDENTIAL

—

NOT

COPY

3.3.3

Audio

Signals

3.3.3.1

Audio

Input

Ports

2channels

3.3.3.2

Speakers

2W(max.)

3.3.4

—

Input

Signal

Connectors

3.3.4.1

RGB

Video

Input

mini

D-sub

PortA

GROUND

GROUNDT

GROUND

H.SYNC

V.SYNC

Port

Separate

Sync

___|_______GROUND_————

_____

GROUND

[__7___[-____GRoUND

[_______

GROUND

[No

connection

[_____

GROUND.

[SYNC

[____VSYNC

ViewSonic

Corporation

VP181

CONFIDENTIAL

NOT

COPY

OOOO:

OOOOOs

sbOOO0O0On

3.3.4.2

Composite

Video

Connector

RCA

jack

S-video

(Not

individually

selectable)

3.3.4.3.

Audio

Connector

3.5mm

Stereo

jack

3.5mm

Microphone

Passthrough

jack

3.3.5

Signal

Timing

3.3.5.1

Timing

Mode

Timing

Mode

Memory,

circular

use

when

new

mode

detected

3.3.5.2

Timing

mode

Change

maximum

time

for

mode

Change

sec.

3.3.5.3.

Signal

Timing

Table

The

factory

test

input

video

signal

defined

the

following

table:

SYN

POL.

SYN|

SYNC

MOD

[i][s1489s05KHe

7o0st

640xa00(7)|

___TBMVEA

[MOD

aI]

31.46920.5KHe

S.84a7He|-

|__|

B40XABO(ED)

__MODIai|

34.97

s08KH

68.67a15he[

6a0Xa80(65)

—_

MAC

MOD

[al]

37.66

205KHe

["72etstsHe|-

_6a0xa80cra)

/_MOD

ISI]

375

e08KHiz

76a

eRe

6AOXAB0(75)

MOD

BO0XB00(72)

MAC

MOD

[13]

48.363

+0.5KHz

60.0215Hz

1024X768(60)

MOD

[ra]

68.476

5KH2

70.021.5He

[=|

TO24R768(70)|

—

VESA

STANDARD

|_MOD

[re

601025

20.5KHe

76.021.6Hz

TO2aX768(78)|

VEGA

STANDARD

MOD

[6]

54348

20.5KHe

600621.5H2

THS2XB6A(60)|

—

VESA

STANDARD

MOD

TIT]

65.851

.5KHe

[70.01

et.SHz

TiS2XB64(70)|

—

VESASTANOARD

MOD

[ra

67.5

s08KHz

[7603452

TiS2k864(75)|

—

VESASTAN

MOD

[re]

60.0020.5kHe

600z4.5Hz

1280KG60(60)|

—

VESASTAR

VESASTAN

[MOD

ety

70.876

x0.5KHe

75.034

VESASTAR

MOD

[22]

75.000

0.5KHz

60.0

+1.5Hz

VESA

STAN

MOD

Pa]

67.250

05KHe

6BOHi.5he

ViewSonic

Corporation

VP181

V.sync

Video

Mode

Frequency

Preset

No.

H.sync

Frequency

Description

<ssi<ai

B51

bP]

dD}

55}

elas

bi S|

A} Al

ys)

Oo]

”

> >

iw)

ig)

DO)

UO}

>| >|

>| S|

30]

CONFIDENTIAL

—-

NOT

COPY

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