LG L17V36DVD Service Manual

SERVICE MANUAL

Product Type: LCD TV Chassis: ML-027B Manual Part #: 3828VD0140D Model Line: Product Year: 2003

L17W36DVD

Model Series:

CONTENTS

Specifications ..............................................................4

Description of Controls .................................................5

Adjustment Instructions ................................................8

Diagrams ...................................................................12

Parts List ...................................................................17

Schematics ....................................................................

Published June 2003

by Technical Publications

Zenith Electronics Corporation

201 James Record Road

Huntsville, Alabama 35824-1513

Printed in Korea

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PRODUCT SAFETY

IMPORTANT SAFETY NOTICE

This manual was prepared for use only by properly trained audiovisual service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from Zenith Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring, and lead dress must conform to original layout upon completion of repairs. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it only with the factory specified fuse type and rating. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB. Always keep wires away from high voltage or high temperature parts.

Special components are also used to prevent shock and fire hazard. These components are indicated by the letter “x” included in their component designators and are required to maintain safe performance. No deviations are allowed without prior approval by Zenith Electronics Corporation. Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.

Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed.

CAUTION: Do not attempt to modify this product in any way.

Never perform customized installations without manufacturer’s approval. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury.

GENERAL GUIDANCE

An lsolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating to protect against personal injury from electrical shocks. It will also protect the receiver and its components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation.

Before returning the receiver to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock.

LEAKAGE CURRENT COLD CHECK (ANTENNA COLD CHECK)

With the instrument’s AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together, and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1MΩ and 5.2MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. Any other abnormality that exists must be corrected before the receiver is returned to the customer.

ELECTROSTATICALLY SENSITIVE DEVICES

Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on the body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as an ESD mat, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material.)

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution: Be sure no power is applied to the chassis or circuit, and observe

all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise, seemingly harmless motion, such as the brushing together of your clothing or the lifting of your foot from a carpeted floor, can generate static electricity sufficient to damage an ES device.)

REGULATORY INFORMATION

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 designed to provide reasonable protection against harmful 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 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 receiver; Connect the equipment into an outlet on a circuit different from that to which the receiver is connected; Consult the dealer or an experienced radio/TV technician for help.

The responsible party for this device’s compliance is:

Zenith Electronics Corporation 201 James Record Road Huntsville, AL 35824, USA Digital TV Hotline: 1-877-993-6484

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SPECIFICATIONS.................................................................4

DESCRIPTION OF CONTROLS...........................................5

ADJUSTMENT INSTRUCTIONS ..........................................8

TROUBLESHOOTING ........................................................11

PRINTED CIRCUIT BOARD ...............................................12

BLOCK DIAGRAM...............................................................15

EXPLODED VIEW...............................................................16

EXPLODED VIEW PARTS LIST.........................................17

REPLACEMENT PARTS LIST............................................18

SCHEMATIC DIAGRAM..........................................................

TABLE OF CONTENTS

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SPECIFICATIONS

MODEL

Power Requirements*

Adapter (AC to DC Power)

Television System

Television Channels

Television Screen

External Antenna Impedance

Audio Output

L17W36DVD

DC15V/4.5A

In: AC 100-240V ~ 1.6A-0.7A, 50/60Hz

Out: DC 15V, 4.5A

* For use only with Model No. SAD7015SE

AC Adapter, manufactured by H & E CO., LTD.

NTSC

VHF: 2 ~ 13, UHF: 14 ~ 69, Cable: 01 ~ 125

LCD Panel

75 Ω

3 W + 3 W

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DESCRIPTION OF CONTROLS

Controls

MONO DPM

SAP

STEREO

skip/scan

stop

play/pause

repeat

open/close

on/off tv/video menu enter vol ch

On/Off Button

Remote Control Sensor

DPM Indicator

SAP Indicator

Mono Indicator

Power/Standby Indicator

Glows red in Standby mode, Glows green when the TV is turned on.

Stereo Indicator

TV/Video Button

Menu Button

Enter Button

Volume Buttons

Channel Buttons

Stop Button:

Stops playback

Repeat Button:

Repeat playback

Open/Close Button:

Open or close the

disc tray

Disc Slot:

Place a disc on the disc slot. Note : Insert a disc after facing a logo-printed side to front. See a figure.

Play/Pause Button:

Start or pause playback

Skip/Scan Button:

Starts playback from

the selected chapter

or track

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Connection Options

S-VIDEO VIDEO

L / MONO

AUDIO

ANT IN

COMPONENT(480i/480p/720p/1080i)

SOUND

DVD/DTV IN

AUDIO

DC IN (15V)

PC INPUT

DVD OUT

OPTICAL

DIGITAL SOUND

OUT

VIDEO

Headphone Jack

S-Video Input

Video Input

Audio Input

DC 15V Input* *Use with AC adapter.

DVD/DTV Input

(Component (480i/480p/720p/1080i), Audio)

DVD Video Output

PC Sound Input

Digital Sound Optical output

PC Input

Antenna Input

DESCRIPTION OF CONTROLS

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- When using the remote control, aim it at the remote control sensor on the TV.

1 2 3

4 5 6

video audio

fcr/zoom

arc

multimedia

power

open/close tv/video

mute mts/audio

pip cc/sub-t

pip ch pip ch

pip input

exit

pip swap

menu ch

vol

enter

vol

play/pause

/II

a-b

disc menu

3D sound

program

title menu

flashbk/angle

repeat

stop

still scan

sizeposition

sleep

skip

scan

skip

scan

POWER

Switches the TV between

ON and STANDBY.

DVD BUTTON

Controls the DVD player.

For further details, see the

‘DVD Operation’ section.

SLEEP

Sets the Sleep Timer.

ENTER

DD/ EE

(Channel button)

Selects available channels found

with EZ scan.

VOLFF/ GG(Volume button)

Decreases/increases the sound level.

MTS/AUDIO

Selects MTS sound: Mono, Stereo, or SAP. Changes the AUDIO during DVD playback.

CC/SUB-T

Selects closed caption options: Off, EZ Mute, or On. Changes the subtitle language during DVD playback.

PIP CH

Tunes to next higher PIP channel.

PIP INPUT

Selects the input source for the sub picture.

EXIT

Clears all on-screen displays and returns to TV viewing from any menu.

TV/VIDEO

Selects:

TV, Video, S-Video,

DVD, Component, or RGB-PC

mode.

AUDIO

Selects the sound appropriate for the program's character.

ARC

Changes the aspect ratio.

FCR/ZOOM

Press this button to return to the last channel you were watching. Changes the picture size during DVD playback.

SIZE

Changes the sub picture size.

SCAN

MULTIMEDIA

Selects:

TV, DVD, Component, or

RGB-PC mode.

POSITION

Changes the sub picture position.

OPEN/CLOSE

Opens or closes the disc slot.

MUTE

Use to turn the sound on or off temporarily.

VIDEO

Selects a factory preset picture

according to the room.

STILL

Freezes the currently-viewed picture. Sub picture is frozen in PIP/Twin pic-

ture mode.

PIP

Selects PIP or Double window mode.

PIP CH

Tunes to next lower PIP channel.

PIP SWAP

Exchanges the sub/main images.

Displays the main menu on the screen.

NUMBER buttons

Remote Control Key Functions

DESCRIPTION OF CONTROLS

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1. Application Object

This instruction is for the application to the LCD TV.

2. Notes

(1) This set uses an adapter, so connect the adapter and the

set correctly before adjustment.

(2) The adjustment must be performed under the correct

sequence.

(3) The adjustment must be performed in the circumstance of

!5cC of temperature and 65!10% of relative humidity if

there is no specific designation.

(4) The input voltage of the receiver must keep 100~220V,

50/60Hz in adjusting.

(5) The set must be operated for 15 minutes preliminarily

before adjustment if there is no specific designation.

[ ‘Heat Run’ must be performed with the full white signal or TV

noise signal in the internal part of the set.

[ The time for ‘Heat Run’ can be changed owing to production

plan.

3. PC Input Mode Adjustment

3-1. Required Test Equipment

(1) MSPG-925LTH or A pattern generator ;Gray pattern of 16

tones

(2) A adjustment communicator.

3-2. Preparation for Adjustment

(1) Perform ‘Heat Run’ for more than 15 minutes in white

pattern.

(2) Connect the signal of pattern generator with LCD TV.

3-3. Auto Gray Adjustment

(1) Apply the gray signal of XGA(1024X768) 16 tones by

using MSPG-925LTH.

(2) In Service menu mode,adjust the Auto gay from 0 to 1 by

using Vol(+) button.

ADJUSTMENT INSTRUCTIONS

+ 16 hidden pages