LG LH-W5100A Owner’s Manual

[CONTENTS]

SECTION

?SERVICINGPRECAUTIONS...............................................1-2

?ESDPRECAUTIONS.....................................................1-4

?SPECIFICATIONS........................................................1-5

?LOCATIONOFCUSTOMERCONTROLS......................................1-6

SECTION

?

ELECTRICAL

?BLOCKDIAGRAM........................................................2-5

?SCHEMATICDIAGRAMS..................................................2-7

?WIRINGDIAGRAM......................................................2-19

1.GENERAL

2.

AUDIO

TROUBLESHOOTINGGUIDE.

PART

...................................2-1

?VOLTAGESHEET((IC&TR)...............................................2-21

?PRINTEDCIRCUITDIARGAMS............................................2-25

SECTION

?ELECTRICALTROUBLESHOOTINGGUIDE.....................................3-1

?DETAILSANDWAVEFORMSONSYSTEMTESTANDDEBUGGING

3.DVD

PART

. . . . . . . . . . . . . . . .

.3-8

?DVDPARTSCHEMATICDIAGRAMS.........................................3-21

?VOLTAGESHEET(IC&TR)................................................3-27

?PRINTEDCIRCUITDIAGRAM...............................................3-29

SECTION4.EXPLODEDVIEWS...................................4-1

SECTION5.SPEAKERPART.....................................5-1

SECTION6.SPEAKERPART.....................................6-1

?ELECTRICALTROUBLESHOOTINGGUIDE.....................................6-1

?BLOCKDIAGRAM........................................................6-7

?SHEMATICDIAGRAMS.....................................................6-9

?WIRINGDIAGRAM.......................................................6-15

?PRINTEDCIRCUITDIAGRAM...............................................6-17

?SPEAKEREXPLODEDVIEWS.............................................6-23

?REPLACEMENTPARTSLIST...............................................6-35

-1-1-

SECTION

1.

GENERAL

SERVICING

NOTES

1.

Notes

The

1)

The

2)

2.

Repair

The

1)

The

2) impact. damage

Each

3)

the Laser

4) Absolutely

Also

REGARDING

for

transport

pick-up pick-up

Storage

notes

pick-up pick-up

Ifitis

to

the

and

every

adjustment

beams

never

NEVER

and

should should

in

always

never

conductive

incorporates

should

always

subjected

printed-circuit

pick-upisalready

and

point

may

damage

permit

switch

ON

PRECAUTIONS

HANDLING

storage

be

leftinits

be

subjected

bag

a

strong

be

handled

to

strong

board.

installation

the

laser

beams

the

power

eyes!

conductive

to

magnet,

correctly

pressure

individually

screws

to

the

external

enter

laser

and

or

impact,

adjusted

should

the

bag

pressure

so

should

and

eyes!

output

THE

OF

until

never

carefully,

the

result

to

a

absolutely

part

(lens,

PICK-UP

immediately

or

impact.

be

taking

may

high

degreeofprecision,

never

etc.)

prior

Drop

brought

care

be

an

be

touched.

of

the

to

use.

impact

close

to

avoid

magnetic

external

operational

pick-up

if it

pressure

malfunction

and

for

is

damaged.

materials.

that

reason

and

and/or

5)

Cleaning

If

thereisdust for swab

Never

6) Spring

not

this

camera

should

use

alcohol

the

lens).

attempt

excess

by

any

lens

be

other

on

surface

on

the

The

used,

Magnet

to

disassemble

pressure.

liquid

the

swab,

lens

surface,

lensisheld

care

taking

the

If

the

cleaners,

and do

NEVER

contact

the

by

not

How

pick-up.

lens

because

not

allow

dust

a

delicate

to

distort

to

hold

Conductive

is

extremely

the

look

fingers

should

spring.

this.

the

will

they

alcohol

directly

or

other

be

cleaned When

pick-up

Cotton

Sheet

dirty,

damage

to

at

swab

apply

get

the

laser

exposed

away

cleaning

isopropyl

the

lens.)

inside

by

the

beam,

skin.

using

the

lens

Pressure

alcohol

Take

care

pick-up.

and

don't

an

air

surface,

to

not

bush

the

to

let

(such

therefore,

Pressure

cotton

use

too

swab.

as

much

a

used

cotton

(Do

of

-1-2-

NOTES

1.

Preparations

1)

Compact

are

sensitive

can

be

The

2)

2.

1)

2)

3)

4)

5)

6)

7)

pick-upiscomposed

taken,

ism

is

Notes

Before All

equipment,

The

workbench When because

To

prevent

Workers

Care

should

tic

electricity

The

laser

REGARDING

disc

to,

damaged,

therefore,

present,

for

repair

replacing

removing

thereisthe

AC

should

be

changes

beam

players

or

and

easily

and

to

avoid

where

a

component

incorporate

for

thereisexcessive

measuring

should

the

be

laser

possibilityofdamage

leakage,

be

taken

from

the

grounded

not

in

the

pick-up

affected

that

reason

of

many

repair

part,

instruments

covered

pick-up

metal

by

to

permit clothing

COMPACT

a

great

static

by,

components

optical

or

storage

first

disconnect

and

withaconductive

from

its

of

armband

the

to

the

laser

escape

NEVER

part

an

should

ICsaswell

many

electricity.

components

where

conductive

dust.

tools

by

the

must

static

soldering

(1M

pick-up

from

be

DISC

as

If

such

should

Ω)

be

and

other

temperature

the

power

be

grounded.

sheet

and

do

bag,

electricity.)

iron

should

to

come

the

armband.

directly

PLAYER

the

pick-up

static

handled

high-precision

of

supply

grounded.

not

place

be

in

contact

the

facing

Armband

REPAIRS

(laser

diode).

electricityishigh

with

care.

components.

humidityishigh,

lead

wire

from

the

pick-up

grounded.

with

or

eyes

on

clothing,

bare

skin.

These

voltage,

where

the

unit

the

in

order

Care

strong

bag.

components

must

magnet-

is

(This

to

prevent

be

sta-

Resistor

(1

Mohm)

Conductive Sheet

Resistor

(1

Mohm)

-1-3-

ESD

PRECAUTIONS

Electrostatically

Some

semiconductor

commonly

circuits be

used

1.

Immediately

any

are

and

to

help

electrostatic

commercially priortoapplying

2.

After

removing

face

such

3.

Use

onlyagrounded-tip

4.

Use

only

an

generate

5.

Do

not

use

devices.

6.

Do

not

remove

to

ready

conductive

7.

Immediately

install

protective

CAUTION

:

called

some

as

anti-static

electrical

freon-propelled

foam,

material

BE OTHER

(solid

Electrostatically

field-effect

reduce

before

the

handling

charge

available

power

an

electrical

aluminum

charges

a

replacement

it.

(Most

aluminum

before

SURE

removing

to

the

NO

SAFETY

discharging

to

foil,

solder

Sensitive

devices

state)

transistors

incidence

semiconductor

any

on

your

bodybytouching

the

unit

assembly

to

prevent

soldering

removal

sufficient

chemicals.

ESD

replacement

foil

or

the

chassis

POWER

protective

or

IS

PRECAUTIONS.

can

Sensitive

and

semiconductor

of

component

wrist

strap

under

test.

equipped

electrostatic

irontosolder

device.

to

damage

These

device

ESD

from

devices

comparable

circuit

assembly

APPLIED

Devices

be

damaged

Devices

damage

component

a

device,

with

or

Some

ESD

can

generate

its

are

conductive

material

TO

THE

(ESD)

easily

(ESD).

chip

caused

known

charge

unsolder

solder

protective

from

which

ESD

devices.

packaged

the

into

which

CHASSIS

earth

devices,

buildup

removal

electrical

materials).

static

by

Examples

components.

or

semiconductor-equipped

ground.

should

ESD

devices.

package

with

leads

the

OR

static

by

be

place

or

exposure

devices

charges

leads

of

device

until

a

CIRCUIT,

electricity.

of

typical

The

electricity.

Alternatively,

removed

the

assembly

not

sufficient

immediately

electrically

replacement

willbyinstalled.

Such

ESD

following

for

potential

of

the

assembly.

classified

ESD

AND

components

devices

techniques

assembly,

obtain

on

a

as

to

damage

before

shorted

device,

OBSERVE

are

integrated

drain

and

wear

shock

reasons

conductive

"anti-static"

ESD

are

you

together

touch

ALL

should

off

a

sur-

can

by

the

8.

Minimize such

as

erate

static

CAUTION.

bodily

the

brushing

electricity

GRAPHIC

THE INTENDED GEROUS ELECTRIC

THE SERVICE LITERATURE.

motions

LIGHTNING

EXCLAMATION

when

together

sufficient

TO

ALERT

VOLTAGE"

SHOCK.

PERSONNEL

handing

of

your

to

damage

SYMBOLS

FLASH

THE

THAT

POINT

unpackaged

clothes

WITH

SERVICE

MAY

WITHIN

TO

THE

fabricorthe

an

ESD

APROWHEAD

PERSONNEL

BE

OF

AN

PRESENCE

replacement

device).

SYMBOL.

SUFFICIENT

EQUILATERAL

OF

lifting

TO

MAGNITUDE

IMPORTANT

ESD

of

your

WITHIN

THE

TRIANGLE

devices.

foot

AN

PRESENCE

SAFETY

(Otherwise

from

EQUILATERAL

TO

CONSTITUTE

IS

INTENDED

a

carpeted

OF

UNINSULATED

INFORMATION

harmless

floor

TRIANGLE,

A

TO

ALERT

RISK

IN

can

"DAN- OF

THE

SERVICE

motion

gen-

IS

-1-4-

SPECIFICATIONS

-1-5-

LOCATION

OF

CUSTOMER

CONTROLS

FRONT

PANEL

DISPLAY

WINDOW

-1-6-

REAR

PANEL

-1-7-

-1-8-

SECTION

2.

AUDIO

PART

ELECTRICAL

INSERT

POWER

THE

TURN

IS

TURN

POWER

RED

POWER

CORD.

ON

LED?

YES

ON?

YES

ON.

TROUBLESHOOTING

NO

AND

CHECK

POWER

GUIDE

POWER

SUPPLY

PLUG

CIRCUIT.

DOES

READ

DOES

IT

AUDIO?

INITIAL

WORK?

IT

OUTPUT

YES

PLAY?

YES

NO

CHECK

TRACKING

LASER

FOCUS

AUDIO

DISC.

SERVO

CIRCUIT.

OK

-2-1-

2.

AUDIO

μ.COM

CIRCUIT

-2-2-

3.

FRONT

CIRCUIT

(1/2)

THE

ON

POWER

IS

CHECK

ALL

TURN

GREEN

DIGITRON

NORMALLY?

BUTTENS

ARE

OK.

ON

YES

ON

NO

RECONNECTIT.

(REFER

TO

NOTICE

*1).

LED?

NO

CHECK

THE

PN101/PN102

IS

OK?

IF

YES

NO

CHECK

FRONT

IS

IF

POWER

OK(*2).

THE

NO

REFER

TO

SMPS

PART.

YES

IF

THE

FRONT

CHECK

VOLUME

CHECK

HEADPHONE

IS

CHECK

REMOCON IS

OK.

B/D

YES

IF

IS

IF

OK.

NO

*1:

*2:

CHECK

THE

When

short

PN101

PIN2 PIN3 PIN4

VFD001

ARE

IF

PINS

OK.

itisneeded

ZD

972

Pins

:

-23.0V

:

-2

7.5V

:

5.0V

CHECK

AND

to

reconnect

+

and

screw(chassis

FPC

PATTERN

RESOLDERING.

cable

GND)

into

near

PN101/PN102,

to

ZD972.

PIN11:-34.0V PIN20

:

12.0V

-2-3-

4.FRONT

CIRCUIT

(2/2)

-2-4-

SECTION

3.

DVD

PART

ELECTRICAL

1.

Power

check

DVD

TROUBLESHOOTING

flow

TROUBLESHOOTING

GUIDE

-3-1-

2.

Test

&

debug

flow

-3-2-

-3-3-

-3-4-

-3-5-

-3-6-

-3-7-

DETAILS

AND

W

VEFORMS

ON

SYSTEM

TEST

1.

AND

SYSTEM

MT1379

1)

DEBUGGING

27MHz

main

clock

CLOCK,RESET,FLASH

is

at

27MHz(X501)

R/W

SIGNAL

2)

MT1336

reset

is

high

active

-3-8-

3)

RS232

waveform

during

procedure(Downloading)

4)

Flash

R/W

enable

signal

during

download(Downloading)

-3-9-

2.

SDRAM

CLOCK

1)

MT1379

main

clock

is

at

27MHz(X501)

3.

TRAY

1)

Tray

OPEN/CLOSE

open/close

SIGNAL

waveform

-3-10-