LG 32LD350 Betriebsanleitung

32LD35032LD350

720P

32LD35032LD350

Direct View LCDDirect View LCD

720P

Direct View LCD

Training

LCD-DV Troubleshooting

32" Class HD 720P

LCD TV (31.5" diagonally)

Published November 16th , 2010

Updated February23rd, 2011

OUTLINEOUTLINE

Preliminar

Section:

Contact Information, Preliminary Matters, Specifications,

LCD Overview, General Troubleshooting Steps,

Signal Distribution, Disassembly Instructions and Voltages

Troubleshooting Section: Board Operation Troubleshooting of :

Signal

Distribution,

Disassembly

Instructions

and

Voltages

Disassembly Section: Removal of Circuit Boards

•Switch Mode Power Supply

•Ballast (Backlight Driver)

•Main Board

•Ft Control Board

•Key Board

•Speakers

November LCD TV 32LD350

32LD350 LCD Direct View Display

Overview of Topics to be DiscussedOverview of Topics to be Discussed

32LD350

LCD

Direct

View

Display

Section 1

This Section will cover Contact Information and remind the Technician of Important

Safety Precautions for the Customers Safety as well as the Technician and the

Equipment.

Basic Troubleshooting Techniques which can save time and money sometimes can

be overlooked. These techniques will also be presented.

Thi S ti ill t th T h i i f ili ith th Di bl Id tifi ti d

Thi

on w

ill

ili

ar w

ith

sassem

tifi

on an

Layout of the LCD Display Panel.

fS f C

At the end o

this

ection the Technician should be able to Identi

y the

ircuit Boards

and have the ability and knowledge necessary to safely remove and replace any

Circuit Board or Assembly.

November LCD TV 32LD350

IMPORTANT SAFETY NOTICEIMPORTANT SAFETY NOTICE

Preliminary Matters (The Fine Print)Preliminary Matters (The Fine Print)

IMPORTANT

SAFETY

NOTICEIMPORTANT

SAFETY

NOTICE

The information in this training manual is intended for use by persons possessing an adequate background in

electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product,

personal injury and property damage can result. The manufacturer or seller maintains no liability for the

interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this

product, under no circumstances should the original design be modified or altered without permission from LG

Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or

user injury If wires screws clips straps nuts or washers used to complete a ground path are removed for

user

injury

wires

screws

clips

straps

nuts

washers

used

complete

ground

path

are

removed

for

service, they must be returned to their original positions and properly fastened.

CAUTIONCAUTION

To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for

dia

nosis or test

oses

disconnect the

ower immediatel

after

erformin

the necessar

checks. Also be

gpp, p ypg y

aware that many household products present a weight hazard. At least two people should be involved in the

installation or servicing of such devices. Failure to consider the weight of an product could result in physical

injury.

November LCD TV 32LD350

ESD NoticeESD Notice

(Electrostatic Static Discharge)(Electrostatic Static Discharge)

Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage

the electronics in a manner that renders them inoperative or reduces the time until their next failure.

Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively,

you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before

removing a replacement part from its package, touch the anti

static bag to a ground connection point or

removing

replacement

part

from

its

package,

touch

the

anti

static

bag

ground

connection

point

unpainted metal in the product. Handle the electronic control assembly by its edges only. When

repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

lflf

Regu

atory In

ormationRegu

atory In

ormation

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to

Part 15 of the FCC Rules. These limits are desi

ned to

rovide reasonable

rotection a

ainst harmful

gp p g

interference when the equipment is operated in a residential installation. This equipment generates, uses,

and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction

manual, may cause harmful interference to radio communications. However, there is no guarantee that

interference will not occur in a particular installation. If this equipment does cause harmful interference to

radio or television reception which can be determined by turning the equipment off and on the user is

radio

television

reception

which

can

determined

turning

the

equipment

off

and

the

user

encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate

the receiving antenna; Increase the separation between the equipment and the receiver; Connect the

equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the

dealer or an experienced radio/TV technician for help.

November LCD TV 32LD350

LG Contact InformationLG Contact Information

Customer Service (and Part Sales) (800) 243-0000

ThilS ( dP Sl)

(800) 84

upport

(

art

)

(800)

7-75

USA Website (GSFS) http://gsfs-america.lge.com

Customer Service Website http://www.us.l

service.com

Knowledgebase Website http://lgtechassist.com

LG Web Training https://lge.webex.com

LG CS L i A d

htt //l l /il

Presentations with Audio/Video

and Screen Marks

New: 2010 Models Wireless

Ready Software Downloads for

earn

emy

htt

//l

ge.com

/il

earn

32LD350 32LG40 32LH30 37LH55 42LG60 42LG70 42LH20 42LH40 42LH50 42LH90

http://136.166.4.200

Training Manuals, Schematics with Navigational Bookmarks, Start-Up Sequence, Owner’s Guides,

Interconnect Diagrams, Dimensions, Connector IDs, Product Pictures and Features.

32LD350

32LG40

32LH30

37LH55

42LG60

42LG70

42LH20

42LH40

42LH50

42LH90

42SL80, 47LG90, 47LH85, 42LE5500, 42LX6500 (3D), 47LX9500 (3D), 55LX6500 (3D)

42PG20, 42PJ350, 42PQ20, 42PQ30, 50PG20, 50PJ350, 50PK250, 50PK750, 50PS80, 50PK950,

50PS60, 60PK750, 60PK950, 60PS11, 60PS60, 60PS80

LCD-DV:

PLASMA:

Published July 2010 by LG Technical Support and Training

LG El i Al b I

lso available on the Plasma Page:

PDP Panel Alignment Handbook,

Plasma Control Board ROM Update (Jig required)

New Training Materials on theNew Training Materials on the

Learning Academy siteLearning Academy site

November LCD TV 32LD350

ectron

ama,

nc.

201 James Record Road, Huntsville, AL, 35813.

Safety and Handling Regulations

LCD Direct View OverviewLCD Direct View Overview

1. Approximately 20 minute pre-run time is required before making any picture performance

adjustments from the Menu.

2. Refer to the Voltage/Current silk screening on the Switch Mode Power Supply.

MOS circuits are sensitive to static electricity.

MOS

circuits

are

sensitive

static

electricity.

Use caution when dealing with these IC and circuits.

4. Exercise care when making voltage and waveform checks to prevent costly short circuits

from damaging the unit.

cau

ous

f l

r m

objec

poss

rt in th

e cau ous o os sc e s a d o e e a objec s o p e e a poss b e s o e

circuitry.

Checking Points to be Considered

1. Check the appearance of the Replacement Panel and Circuit Boards for both physical

damage and part number accuracy.

Check the model label Verify model names and board model matches

Check

the

model

label

Verify

model

names

and

board

model

matches

3. Check details of defective condition and history. Example: Oscillator failure dead set, etc…

November LCD TV 32LD350

Basic Troubleshooting StepsBasic Troubleshooting Steps

Define, Localize, Isolate and Correct

•Define Look at the symptom carefully and determine what circuits could be causing

the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and

check for possible overheated components. Capacitors will sometimes leak dielectric material

and give off a distinct odor Frequency of power supplies will change with the load or listen for

and

give

off

distinct

odor

Frequency

power

supplies

will

change

with

the

load

listen

for

relay closing etc. Observation of the front Power LED may give some clues.

•Localize After carefully checking the symptom and determining the circuits to be

checked and after giving a thorough examination using your senses the first check should

checked

and

after

giving

thorough

examination

using

your

senses

the

first

check

should

always be the DC Supply Voltages to those circuits under test. Always confirm the supplies

are not only the proper level but be sure they are noise free. If the supplies are missing check

the resistance for possible short circuits.

•Isolate To further isolate the failure, check for the proper waveforms with the

Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing

and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes

“

glitches

”

“

road bumps

”

will be an indication of an imminent failure

glitches

road

bumps

will

indication

imminent

failure

•Correct The final step is to correct the problem. Be careful of ESD and make sure to

check the DC Supplies for proper levels. Make all necessary adjustments and lastly always

perform a Safety AC Leakage Test before returning the product back to the Customer

November LCD TV 32LD350

perform

Safety

Leakage

Test

before

returning

the

product

back

the

Customer

32LD350 PRODUCT INFORMATION SECTION32LD350 PRODUCT INFORMATION SECTION

This section of the manual will discuss the specifications of the

32LD350

November LCD TV 32LD350

LCD Direct View Display

Basic SpecificationsBasic Specifications

Key TV Features

• High Definition Resolution

70 000 1 D i C t t R ti

•

000

ynam

ras

• Picture Wizard II (Easy Picture Calibration)

• Smart Ener

Savin

gy g

• AV Mode (Cinema, Sports, Game)

• Clear Voice II

•

ISFccc® Ready

ISFccc®

Ready

• 24P Real Cinema

• 2 HDMI™ 1.3 Inputs

SIMPLINK™ C ti it

•

SIMPLINK™

onnec

• Dolby® Digital 5.1 Decoder

• Infinite Sound

November LCD TV 32LD350

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