LG 32LG40 User Manual

TRAINING MANUAL

Model : 32LG40 32” CLASS LCD HDTV

Direct View LCD

With built in DVD Player

32LG40

w/ BUILT-IN DVD PLAYER

(31.5" diagonal)

Original 08/12/2008

Updated 10/13/2010

OUTLINE

Section 1

Section 2

Contact Information, Preliminary Matters, Specifications, LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages

Circuit Board Operation, Troubleshooting of :

• Switch mode Power Supply

• Main (Digital) Board

•T-CON Board

•Ballast Board

LCD DV August 2008 32LG40

Overview of Topics to be Discussed

32LG40 LCD Direct View Display

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.

Section 1

This Section will get the Technician familiar with the Disassembly, Identification and Layout of the LCD Display Panel.

At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to remove and replace safely any Circuit Board or Assembly.

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Preliminary Matters (The Fine Print)

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

Caution

To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be 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.

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(Electrostatic Static Discharge)

ESD Notice

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 unpainted metal in the product. Handle the electronic control repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

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 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.

(Electrostatic Static Discharge)

assembly by its edges only. When

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LG Contact Information

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

Technical Support (and Part Sales) (800) 847-7597

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

Customer Service Website http://www.us.lgservice.com

Knowledgebase Website http://lgtechassist.com

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

LG CS Academy http://ln.lge.com/ilearn

LCD-DV:

PLASMA:

PDP Panel Alignment Handbook, Schematics with Bookmarks

32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 42LH90, 42SL80, 47LG90, 47LH85, 42LE5500, 47LE8500

42PG20, 42PJ350, 42PQ20, 42PQ30, 50PG20, 50PJ350, 50PK250, 50PK750, 50PS80, 50PS60, 60PK750, 60PS11, 60PS60, 60PS80

Also available on the Plasma Page:

Plasma Control Board ROM Update (Jig required)

Published August 2008 by LG Technical Support and Training

LG Electronics Alabama, Inc.

201 James Record Road, Huntsville, AL, 35813.

New: 2010 Models Software Downloads Technical Assistance

Presentations with Audio/Video and Screen Marks

http://136.166.4.200

New Training Materials on

the Learning Academy site

LCD DV August 2008 32LG40

OVERVIEW SECTION

Safety and Handling Regulations

1. Approximately 20 minute pre-run time is required before any adjustments are performed.

2. Refer to the Voltage Sticker on the Switch Mode Power Supply silk screening. (+/- ½ volt).

3. Be cautious of electric shock from the Backlight section, it uses high voltage AC. Check that the Power Supply and Drive Circuits are completely discharged because of residual current stored before Circuit Board removal.

4. C-MOS circuits are sensitive to static electricity. Use caution when dealing with these IC and circuits.

5. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.

6. Be cautious of lost screws and other metal objects to prevent a possible short in the 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.

2. 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…

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

•Localize checked and after giving a 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 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” or “road bumps” will be an indication of an imminent failure.

•Correct 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.

After carefully checking the symptom and determining the circuits to be

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

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

LCD DV August 2008 32LG40

32LG40 Product Information

This section of the manual will discuss the specifications of the 32LG40

“Thin” LCD Direct View Display Panel.

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Side View

Basic Specifications

•720p HD Resolution

• 12,000:1 Dynamic Contrast Ratio

• Side-loading Progressive Scan DVD Player

• Super Multi-Format

• 3x HDMI™ 1.3

• AV Mode (Cinema, Sports, Game)

• Clear Voice

• SimpLink™ Connectivity

• Invisible Speaker System

• Expert Mode

• PC Input

• Swivel Stand (Manual)

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Pixel Count to Resolution Comparisons

NTSC

HD HD

720P Logo

HD RESOLUTION 720p HD Resolution Pixels: 1365 (H) × 768 (V)

High definition television is the highest performance segment of the DTV system used in the US. It’s a wide screen, high-resolution video image, coupled with multi-channel, compact-disc quality sound.

720P Panel

FORMATS

480I 480P

1080I 720P

1080P

Interlaced Progressive

Progressive

240 Lines 480 Lines

540 Lines 720 Lines

1080 Lines

768

BASIC

PIXEL COUNTS

720P Panel

1365 (H) × 768 (V)

Possible Frame Rates: 24FPS 30FPS 60FPS

Interlaced 2 Fields to make a Frame

1080P Panel

Progressive

1920 (H) x 1080 (V)

Each Field is a Frame

Think of sync as the Panels “Refresh Rate”

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Basic Specifications

LG SIMPLINK™ MULTI-DEVICE CONTROL

Allows for convenient control of other LG SimpLink products using the existing HDMI connection.

HDMI (1.3 Deep Color) Digital multi-connectivity

HDMI (1.3 Deep color) provides a wider bandwidth (340MHz,

10.2Gbps) than that of HDMI 1.2, delivering a broader range of colors, and also drastically improves the data-transmission speed.

BUILT-IN SIDE LOADING PROGRESSIVE SCAN DVD PLAYER

Save space with the built-in progressive scan DVD player. Side loading player upconverts DVDs to near 720p resolution and features LG “Super-Multi” technology which plays back almost any recordable disc based media.

INVISIBLE SPEAKER SYSTEM

LG’s 2008 line of TVs include a unique invisible speaker system, tuned by renowned audio expert, Mr. Mark Levinson. Speakers are embedded in strategic spots behind the front cabinet and use minute vibrations to turn the entire front bezel into the speaker system. The result is a clean, polished look, and enhanced audio by increasing the “sweet spot” giving a wider sound field.

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Basic Specifications

AV Mode "One click" - Cinema, Sports, Game mode.

TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode which allows you to choose from 3 different modes of Movies, Video Games and Sports by a single click of a remote control.

Clear Voice Clearer dialogue sound

Automatically enhances and amplifies the sound of the human voice frequency range to provide high-quality dialogue when background noise swells.

Save Energy, Save Money

Home electronic products use energy when they're off to power features like clock displays and remote controls. Those that have earned the ENERGY STAR use as much as 60% less energy to perform these functions, while providing the same performance at the same price as less-efficient models. Less energy means you pay less on your energy bill. Draws less than 1 Watt in stand by.

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Remote Control

p/n: MKJ40653818

BOTTOM PORTION

TOP PORTION

FAV

VOL CH

MUTE

1 2 3

4 5 6

7 8 9

P A G E

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Rear and Side Input Jacks

Current Software Release

32LG40-UA-v03.12_080711_Download.epk

Optical AudioRGB (PC) Audio

HDMI

Remote

RGB (PC)

Component

Y Pr/Pb

Composite

RS232

Service Only

Audio

Out

Side Input Jacks

USB

HDMI

Composite

A/V

Main Board

Orientation

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Accessing the Service Menu

REMOTE

TOP PORTION

To access the Service Menu.

1) Turn the Set On

2) Simultaneously, Press and “Hold” the Menu Key on the Side Key pad and Press and “Hold” the Menu Key on the Remote approximately 5 seconds.

3) If Customer’s Menu appears, continue to hold until it disappears.

4) The Service Menu appears

SIDE KEYS

Note: Dependant upon the Software Version, a Password

may be required to enter the Service Menu.

If a password is required, enter

0000

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Software Upgrade Procedure

1) Create an LG_DTV folder on the USB Flash Drive

Shows the

Currently

Installed

Version

2) Copy new software (xxx.epk) to "LG_DTV" folder. Make sure to have correct software file.

3) With TV turned on, insert USB flash drive.

4) You can see the message “TV Software Upgrade” (See figure to right)

5) Cursor left and highlight "START" Button and push “Enter” button using the remote control.

6) You can see the download progress Bar.

7) Do not unplug until unit has automatically restarted.

8) When download is completed, you will see “COMPLETE”.

9) Your TV will be restarted automatically.

Shows the

Software

Version

found on the

USB Flash

Drive

Shows the

Software file found

on the USB Flash

Drive

* CAUTION: Do not remove AC power or the USB Flash Drive. Do not turn off Power, during the upgrade process.

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32LG40 Product Measurements

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TROUBLESHOOTING SECTION

This section of the manual will discuss troubleshooting.

Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems.

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Removing the Back Cover

The Stand does not need to be removed. Remove the 18 screws shown by arrows.

Pay attention to the size and type of screw as there are many different types.

Putting in the improper screw when reassembling may Cause damage.

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Circuit Board Layout

Ballast p/n

EAY56797501

Panel p/n EAJ41825601

T-CON p/n

EAT56801301

LVDS

Cables

Side

Controls

Speakers

Side

Inputs

Speaker rattle.

1) Tighten screws at bottom of cabinet

2) Tighten screws holding woofers

LCD DV August 2008 32LG40

Invisible Speaker System Layout

Woofers

Tweeters Tweeters

Speaker rattle.

1) Tighten screws at bottom of cabinet

2) Tighten screws holding woofers

Bottom View of Woofer Ports

Stand Removed

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+ 51 hidden pages