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TRAINING MANUAL


LCD DIRECTVIEW TELEVISION - 2006




                                   Service
                             Digital Display
Published February 2006 by LG Education & Product Engineering
Customer Service (and Part Sales): 1-800-243-0000
Technical Support (and Part Sales): 1-800-847-7597
USA Website: www.lgusa.com
Customer Service Website: us.lgservice.com
B2B Service Website: aic.lgservice.com
Training Website: www.LGCSAcademy.com
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-visual service technicians. 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. 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. Do not
attempt to modify this product in any way.
Special components are also used to prevent shock and fire hazard and are required to maintain safe performance. No deviations are allowed
without prior approval by LG Electronics. 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.

GENERAL SAFETY 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.
With the instrument 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 1M and 5.2M. 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" compo-
nents. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
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. 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. Use
only a grounded-tip soldering iron to solder or unsolder ES devices. 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. Do not use freon-propelled chemicals which can
generate electrical charge sufficient to damage ES devices. Do not remove a replacement ES device from its protective package until immediately
before you are ready to install it. 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:
LG Electronics of Alabama, Inc.
201 James Record Road
Huntsville, AL 35824, USA
Digital TV Hotline: 1-800-243-0000
TABLE OF CONTENTS
 OVERVIEW .................................................. 5         TV GUIDE ................................................. 82
      INTRODUCTION ........................................ 5               OVERVIEW ............................................ 82
      MOUNTING INTERFACE .............................. 5                   OPERATION ........................................... 82
      COMPUTER CONNECTION ............................ 6                    SYSTEM INFO ........................................ 83
      REMOTES ................................................ 6            SYSTEM FLOWCHART ............................... 85
 TERMINOLOGY ............................................ 7
      VIEWING ANGLE ....................................... 7
      IPS (IN-PLANE SWITCHING) ....................... 7
      PEAK BRIGHTNESS ................................... 7
      CONTRAST RATIO ...................................... 7
      RESPONSE TIME ....................................... 7
      A/V CONNECTIONS .................................... 8
 THEORY ..................................................... 9
      LIQUID CRYSTALS ..................................... 9
      LIQUID CRYSTAL DISPLAY .......................... 9
      LIQUID CRYSTAL PANEL ........................... 10
      LCD VERSUS CRT .................................... 11
      LCD VERSUS PLASMA .............................. 11
 MODEL OVERVIEW ..................................... 12
      MODEL NUMBERS ................................... 12
      MODEL DESCRIPTIONS ............................. 15
 CIRCUIT DESCRIPTIONS ............................. 20
      15"CIRCUIT DESCRIPTIONS (L15V26) ........ 20
      30"CIRCUIT DESCRIPTIONS (L30W26) ....... 23
      32" CIRCUIT DESCRIPTIONS (CABLECARD MODELS)
      28
 FIRMWARE UPDATES .................................. 33
      FIRMWARE UPDATES VIA MEMORY CARD ..... 33
 DISASSEMBLY ........................................... 37
      SMALL SCREEN MODELS ........................... 37
      LARGE SCREEN MODELS - PART 1 .............. 37
      LARGE SCREEN MODELS - PART 2 .............. 39
      EXPLODED VIEWS ................................... 40
 CABLECARD .............................................. 62
      DIGITAL CABLE READY (DCR) .................... 62
      CEA-NCTA AGREEMENT ............................. 62
      TERMS ................................................. 63
      VENDORS .............................................. 63
      DCR ARCHITECTURE ................................ 64
      HOST-CABLECARD INTERFACE ................... 64
      IN-BAND/OOB SPECIFICATION ................... 66
      CABLE MENU & MMI ............................... 67
      DIGITAL CERTIFICATES DATA ..................... 70
      CABLECARD RESET .................................. 70
      EAS (EMERGENCY ALERT SYSTEM) .............. 70
      HOST DIAGNOSTICS ................................ 71
      ERROR REPORTING ................................. 71
      CABLE CARD TROUBLESHOOTING ............... 72
      IN-HOME TROUBLESHOOTING ................... 77
      CABLECARD TROUBLESHOOTING ................ 80




  Directview LCD Training                                          3                                                     Contents
-4-
                                                                                      OVERVIEW

OVERVIEW
INTRODUCTION
All LCD TV models are module level repair in and out of warranty. They are
covered by a one year parts and labor warranty. For service, the end user
should call 1-800-243-0000 for complete shipping and handling
instructions. Refer to the last page of the owner's manual for more warranty
information. For models under 30", the Sevice Level is Factory Service
Repair. Larger models are Field Service. Although, warranty repair by an
ASC is approved in certain situations for smaller screen models. Contact
the LG Warranty department for more information.
Most models are similiar in function and internal layout with the exception of models over 23". For
example, the 30" inch LCD has more fluorescent lamps than normal (16 lamps) and some additional
user functions.
Note that not all models support HDTV (High Definiton Television). The 10", 13", and 20" models do
not support HDTV, but 20" models do support EDTV (Enhanced Definiton Television). The section on
Models has more information about the specifications of each model.

MOUNTING INTERFACE
The Video Electronics Standards Association (VESA) Flat Display Mounting Interface Standard (FDMI)
outlines mounting interface standards for flat-panel displays. VESA FDMI Standards are 75 x 75 mm,
100 x 100 mm, and 100 x 200 mm mounting hole pattern with 4, 4 mm x 10 mm screws. Most new
models feature a VESA mount, except large screen models. Large screen models use mounting hole
patterns similar to PDPs.



           75MM MOUNT
           10" Models
                                                                          100mm
           100MM MOUNT                                         4mm
           13" to 23"
                                                                                  100mm
                                                                   10mm
           200MM MOUNT
           26" to 32" Models

           NO VESA MOUNT
           37, 42, & 55" models




  Directview LCD Training                          5                                      Overview
OVERVIEW
COMPUTER CONNECTION                                                                                             Computer Video Modes

Most models except the 10", 13", and 20" support                                                                      Horizontal           Vertical
                                                                            Mode          Resolution
                                                                                                                   Frequency (KHz)     Frequency (KHz)
computer video. Set the monitor output resolution
                                                                            VGA              640x400                   31.5KHz              70Hz
and vertical frequency on the PC before connecting
                                                                                             640x400                   37.9KHz              85Hz
to the TV (see table). Connect the TV to the computer                                        640x480                   31.5KHz              60Hz
with a VGA cable. Connect the computer's audio                                               640x480                   35.0KHz              67Hz
output to the TV's PC SOUND input.                                                           640x480                   37.9KHz              72Hz
The TV has been pre-adjusted to use XGA 1024x768,                                            640x480                   37.5KHz              75Hz
                                                                                             640x480                   43.3KHz              85Hz
60Hz format. If possible, use one of the XGA formats
                                                                                             720x400                   31.5KHz              70Hz
to obtain the best image quality for your TV/LCD                            SVGA             800x600                   35.2KHz              56Hz
monitor. LCD monitors should be used at their native                                         800x600                   37.9KHz              60Hz
(normally their max) resolution. If set up under                                             800x600                   48.1KHz              72Hz
other resolutions, a slightly distorted picture may                                          800x600                   46.9KHz              75Hz
appear on the screen. If the message "OUT OF                                                 800x600                   53.7KHz              85Hz
RANGE" appears on the screen, adjust the PC output                          (MAC)            832x624                   49.7KHz              75Hz
                                                                            XGA            1024x768                    48.4KHz              60Hz
to a format listed in the chart.
                                                                                           1024x768                    56.5KHz              70Hz
                                                                                           1024x768                    60.2KHz              75Hz
                                                                                           1024x768                   68.67KHz              85Hz




REMOTES
    2001/2002                                2003+                                                                                 2005+
                                                                             30" LCD STYLE
SMALL SCREEN MODELS                   SMALL SCREEN MODELS                       REMOTE                                      LARGE SCREEN MODELS
                                                                               POWER


                                                                                 SLEEP           INPUT SELECT
                                            mute                power
                                                                                   APC              DASP

    power                  tv/video                                               ARC              PIP ARC
                                          tv/video multimedia mts
                                                                                  PIP            TWIN PICTURE
                                             fcr      exit      menu
     1            2              3                                               SWAP             SUB INPUT

                                                                               MENU                    MUTE
     4            5              6
                                                       ch
     7            8              9                                                         ENTER
                                                                                VOL                    VOL
    flashbk                   cc                     enter
                                              vol               vol
                  0                                    ch
    menu                     mute


                ch                           1
                                             1         2
                                                       2         3
         vol    enter      vol                                                    1          2          3
                                             4
                                             4         5
                                                       5         6
                                                                                  4          5          6
     mts        ch           sleep
                                             7
                                             7         8
                                                       8         9
                                                                 9                7          8          9
                                            audio               video
                                                                                             0
                                                       0
      pip      position
                                            cc      flashbk sleep
               pip input   ch
                                            pip      position


                                                    pip input     ch
                                                                               WIN.SIZE WIN.POSITION

                                                                               ZOOM-      ZOOM+




  Directview LCD Training                                               6                                                                 Overview
                                                                                   TERMINOLOGY

TERMINOLOGY
This section explains some of the terminology used with LCD TVs.
VIEWING ANGLE
Viewing angle is the angle at which the display's brightness begins to noticeably diminish. Viewing
angle used to be a major factor when choosing an LCD but they have improved enough on current
models that it is not an issue anymore. This is due to advancements like In-Plane Switching, High-
efficiency Backlights, and reflective Polarizers. Some smaller screen LCDs (under 15") may still have
limited viewing angles to keep costs down.
IPS (IN-PLANE SWITCHING)                                                    Liquid Crystal

In-Plane Switching provides more control over the
                                                                            Electrode
Liquid Crystals in an LCD. It uses an electric field to
line up the Liquid Crystals in an arc formation. This
directs light out at angles which improves the viewing Conventional TFT-LCD                  IPS Mode TFT-LCD
angle.
PEAK BRIGHTNESS
Peak brightness is the maximum amount of brightness that a display can produce. It is often measured
in candella per square meter (cd/m2). Most
LG and Zenith LCDs are 400-450 cd/m2.


CONTRAST RATIO
Contrast Ratio is the ratio of a display's
brightest white to its darkest black. Higher
Contrast Ratios are better and will allow a
TV to reproduce a more realistic picture
and make text easier to read. One of the
limitations of LCDs has been contrast ratio.
With recent improvements, our LCD TVs have a contrast ratio up to 450:1.


RESPONSE TIME
The speed at which the pixels can react or change. Slower response times can cause fast moving video
to "ghost" or distort because the scene changes faster than the LCD can display the video (especially
with video games). Response times of new LCDs isn't a factor for most uses, but older models could
experience noticable ghosting due to slower response times.




  Directview LCD Training                            7                                           Terminology
TERMINOLOGY
A/V CONNECTIONS
Below are connections you may find on LCD TVs. SD = Standard Definition and HD = High Definition.

         Composite                                       P
                                                         R

         Normally labeled "Composite" and/or                  Component Video
         "Video". SD Only.
                                                         P
                                                         B    Normally labeled "Component/
                                                              DTV/DVD". Supports HD.
                                                         Y
         S-Video
         Super Video. Normally labeled "S-Video". SD          Digital Audio
         Only. A little better quality than Composite.        Normally labeled "Digital Audio (coaxial)".
                                                              Better quality then normal audio. Supports
         Antenna
                                                              Surround Sound.
         Normally labeled "Antenna".
         Supports HD. A.k.a. Coax, Cable.                     Optical Audio
         VGA                                                  Normally labeled "Digital Audio (optical)".
         Normally labeled "RGB" and/or                        Better quality then normal audio. Supports
         "PC/DTV". Supports HD.                               Surround Sound. Uses a fiber optic cable.
         DVI                                                  RS-232
         Normally labeled "DVI", "PC/DTV", or "HDMI".         Normally labeled "Calibration Port", "Service
         Digital instead of analog (Digital version of        Port", and/or "RS-232". A.k.a. serial port.
         VGA). Supports HD.                                   Used for uploading firmware or external
                                                              control of the unit (no video or audio).
         HDMI
                                                              IEEE 1394
         Normally labeled "HDMI". Newer version
         of DVI. Supports HD and Digital Audio.               Normally labeled "IEEE 1394" or "DTV Link".
                                                              Supports HD and Digital Audio.




  Directview LCD Training                            8                                 Terminology
                                                                                                  THEORY

THEORY
This section covers what Liquid Crystals are and how an LCD Display works.
LIQUID CRYSTALS
In school you learned that matter has three distinct states; solid, liquid, and gas. However, there are
states of matter that may fall between these states, like liquid crystals. Basically they are crystals
that hold their orientation (shape) but can flow similar to liquids. Their molecules point in same
direction with respect to each other like in a solid, but they are free to change position like in a
liquid. Think of a handful of pencils. They collectively hold their shape at rest, but change shape when
you squeeze or let go of them.




                   SOLID                                      LIQUID             LIQUID CRYSTAL


There are different phases and types of liquid crystals that perform differently. Small amounts of
pressure, heat, and/or electricity can cause liquid crystals to change in some way. For LCDs we are
interested in the electricity aspect, but pressure and heat are side effects that have to be dealt with.
This is why LCDs have a limited operating range and distort when you press on the screen.
LIQUID CRYSTAL DISPLAY
A Liquid Crystal Display is composed of a light source (backlight), a Liquid Crystal Panel, and a driving
circuit. We start with a light source at the back of the panel composed of thin fluorescent bulbs
(CCFLs - Cold Cathode Flouresent Lamps). This light passes through filters to help create a uniform
light source. Then the light passes through the Liquid Crystal Panel which is composed of thousands
of pixels that control the flow of light throught the panel to make images.
                                                         Data Driver IC
                                        Printed Circuit Board
         Driving
         Circuit            Gate Driver IC
                       Inverter

                                             Pixel Array & Wiring

              Power Supply                                                Polarizer
             for Video Signal                                             CF Panel
                                                                          Liquid Crystal     Liquid Crystal
                                                                                                 Panel
                                                                          TFT Panel
                                                                          Polarizer

                                                                          Lamp
                                                                          Prism
                                                                          Diffuser         Backlight Unit
                                                                          Light Guide
                                                                          Reflector
                                                                          Inverter



  Directview LCD Training                                           9                                Theory
THEORY
An LCD panel from a 15" LCD TV.



                                    Reflector
                                                Light Guide
                                                          Frame
                                                                     Diffusers
                                                                             Prism
                                                                                  Liquid Crystal Panel




LIQUID CRYSTAL PANEL
Below (on the left) is a cross section of a liquid crystal panel. The key to an LCD's operation is the
polarizers. The polarizers only allow a certain wavelength of light to pass through. The two polarizers
are mounted at a 90 degree angle with respect to each other, which prevents light from passing
through. The liquid crystals are used to twist the light beam 90 degrees and allow light to pass
through that cell. Color comes from a simple light filter.




                                                                                   TFT Element
                                                         Polarizer

                                                         Color Filter
                                                                                  Pixel Electrode
     Transistor                                                                   (Transparent)
                                                         Common Electrode
    Gate Line
     Data Line
                                                         Liquid Crystal
Pixel Electrode
                                                         Polarizer
                                                                                             Source      Gate       Drain
                                                                                 Semi-conductor
                                                                                 Insulator
                                                                                                      Glass Panel



Each sub-pixel or cell (a red, green, and blue sub-pixel equals one pixel) is controlled by a Thin Film
Transistor (TFT). This provides accurate control of each cell and makes for an accurate picture. Some
methods used in the past that didn't involve a switch and current could leak to surrounding cells
resulting in a blurred image. A TFT is a semiconductor (bottom-right picture), it behaves like a relay
switch.


   Directview LCD Training                               10                                                     Theory
                                                                              THEORY

LCD VERSUS CRT
One disatvantage LCDs have is having fixed
pixels which makes it more difficult to scale
video than a CRT. A CRT can change the pixel
size by adjusting the size of the beam, LCDs
use a processor called a Scalar. LCDs feature
their best picture quality at their native
resolution (or max res) and CRTs feature good                 Scaled
                                                              video
quality at any resolution up to their maximum
                                                             example
resolution.




             LCD ADVANTAGES OVER CRT                    CRT ADVANTAGES OVER
             Uses less power                            LCD
             Less heat ouput                            Better scaling
             Smaller and lighter                        Less expensive
             Unaffected by Magnetic Fields


LCD VERSUS PLASMA




            LCD ADVANTAGES OVER PLASMA               PLASMA ADVANTAGES OVER LCD
            Uses less power                          Less expensive (for same screen size)
            Smaller and lighter                      Brighter
            Replaceable backlight                    Better contrast




 Directview LCD Training                        11                              Theory
- 12 -
                                                                                       MODELS

MODEL OVERVIEW
This section covers some of the past and present LG and Zenith LCD TVs. Most LCD TVs feature similar
features and specifications. They support High Definition and computer input, except for the 10",
13", 20", and the wireless 15" models. The 2005 models 26" and larger have built-in ATSC tuners and
support CableCARDTM. Note that Commerical models don't have CableCARDTM support since it is not
needed in a distribution network.
        KEY TERMS
        SDTV - Standard Definition (480i).
        EDTV - Enhanced Definition (480p).
        HDTV - High Definition (720p, 1080i).
        XD EngineTM - Six distinct processes contribute to picture improvement.
        CableCARDTM - Decoder card for digital cable.
        HDMI - High Definition Multimedia Interface. Alternative to DVI. Smaller connector and
                supports audio.
        HDCP - High-bandwidth Digital Content Protection.

MODEL NUMBERS
 OLDER ZENITH PRODUCTS (02-04)

     Old Zenith Structure:       L15V26

Display Type     Screen Size              Aspect Ratio        Model Year        Feature Level
L = LCD                                   V= 4:3              2 = 2002          2 = Consumer
P = Plasma                                W = 16:9            3 = 2003          4 = Commercial
R = CRT                                                       4 = 2004          6 = Consumer
      Rear Projo
D = Micro
       Display




 Directview LCD Training                         13                                      Models
MODELS
 OLDER LG PRODUCTS

Old LG Structure:           MU



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