Service Manuals, User Guides, Schematic Diagrams or docs for : ZENITH TV L15V26 Zenith L15V26

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Zenith L15V26


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     SERVICE MANUAL                                                                             Model Series:
                                                                                                 L15V26
       Product Type:    LCD TV
       Chassis:         ML-012A
       Manual Series:   CM154
       Manual Part #:   923-03489
       Model Line:      E
       Product Year:    2002




                                                 CONTENTS
                          Safety .......................................................... 2
                          General Info ................................................. 5
                          Servicing ................................................... 15
                          Parts ......................................................... 22
                          Diagrams .................................................... 27
                          Schematics ................................................. 33




                                           Published June 2002
                                         by Technical Publications
                                       Zenith Electronics Corporation
                                          201 James Record Road
                                      Huntsville, Alabama 35824-1513

Printed in U.S.A.
                                 Copyright      2002 by Zenith Electronics Corporation
                                                           PRODUCT SAFETY
PRODUCT SAFETY                                                                 1. Immediately before handling any semiconductor component or
                                                                               semiconductor-equipped assembly, drain off any electrostatic charge
IMPORTANT SAFETY NOTICE                                                        on the body by touching a known earth ground. Alternatively, ob-
This manual was prepared for use only by properly trained audio-               tain and wear a commercially available discharging wrist strap de-
visual service technicians. When servicing this product, under no              vice, which should be removed for potential shock reasons prior to
circumstances should the original design be modified or altered                applying power to the unit under test.
without permission from Zenith Electronics Corporation. All                    2. After removing an electrical assembly equipped with ES devices,
components should be replaced only with types identical to those               place the assembly on a conductive surface such as an ESD mat, to
in the original circuit and their physical location, wiring, and lead          prevent electrostatic charge buildup or exposure of the assembly.
dress must conform to original layout upon completion of repairs. If
any fuse (or Fusible Resistor) in this TV receiver is blown, replace it        3. Use only a grounded-tip soldering iron to solder or unsolder ES
only with the factory specified fuse type and rating. When replacing           devices.
a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the         4. Use only an anti-static solder removal device. Some solder re-
resistor 10mm away from PCB. Always keep wires away from high                  moval devices not classified as "anti-static" can generate electrical
voltage or high temperature parts.                                             charges sufficient to damage ES devices.
Special components are also used to prevent shock and fire hazard.             5. Do not use freon-propelled chemicals. These can generate electri-
These components are indicated by the letter "x" included in their             cal charge sufficient to damage ES devices.
component designators and are required to maintain safe
                                                                               6. Do not remove a replacement ES device from its protective pack-
performance. No deviations are allowed without prior approval by
                                                                               age until immediately before you are ready to install it. (Most re-
Zenith Electronics Corporation. Service work should be performed
                                                                               placement ES devices are packaged with leads electrically shorted
only after you are thoroughly familiar with these safety checks and
                                                                               together by conductive foam, aluminum foil, or comparable con-
servicing guidelines.
                                                                               ductive material.)
Circuit diagrams may occasionally differ from the actual circuit used.
                                                                               7. Immediately before removing the protective material from the
This way, implementation of the latest safety and performance
                                                                               leads of a replacement ES device, touch the protective material to
improvement changes into the set is not delayed until the new
service literature is printed.                                                 the chassis or circuit assembly into which the device will be in-
                                                                               stalled.
CAUTION: Do not attempt to modify this product in any way. Never
perform customized installations without manufacturer's approval.              Caution: Be sure no power is applied to the chassis or circuit, and
Unauthorized modifications will not only void the warranty, but                observe all other safety precautions.
may lead to property damage or user injury.                                    8. Minimize bodily motions when handling unpackaged replace-
                                                                               ment ES devices. (Otherwise, seemingly harmless motion, such as the
GENERAL GUIDANCE
                                                                               brushing together of your clothing or the lifting of your foot from a
An lsolation Transformer should always be used during the servicing            carpeted floor, can generate static electricity sufficient to damage
of a receiver whose chassis is not isolated from the AC power line. Use        an ES device.)
a transformer of adequate power rating to protect against personal
injury from electrical shocks. It will also protect the receiver and its       REGULATORY INFORMATION
components from being damaged by accidental shorts of the circuitry            This equipment has been tested and found to comply with the limits
that may be inadvertently introduced during the service operation.             for a Class B digital device, pursuant to Part 15 of the FCC Rules.
Before returning the receiver to the customer, always perform an AC            These limits are designed to provide reasonable protection against
leakage current check on the exposed metallic parts of the cabinet,            harmful interference when the equipment is operated in a residential
such as antennas, terminals, etc., to be sure the set is safe to operate       installation. This equipment generates, uses and can radiate radio
without damage of electrical shock.                                            frequency energy and, if not installed and used in accordance with
                                                                               the instruction manual, may cause harmful interference to radio
LEAKAGE CURRENT COLD CHECK (ANTENNA COLD CHECK)                                communications. However, there is no guarantee that interference
With the instrument AC plug removed from AC source, connect an                 will not occur in a particular installation. If this equipment does
electrical jumper across the two AC plug prongs. Place the AC switch           cause harmful interference to radio or television reception, which
in the on position, connect one lead of ohm-meter to the AC plug               can be determined by turning the equipment off and on, the user is
prongs tied together and touch other ohm-meter lead in turn to                 encouraged to try to correct the interference by one or more of the
each exposed metallic parts such as antenna terminals, phone jacks,            following measures: Reorient or relocate the receiving antenna; In-
etc. If the exposed metallic part has a return path to the chassis, the        crease the separation between the equipment and receiver; Connect
measured resistance should be between 1M and 5.2M. When the                    the equipment into an outlet on a circuit different from that to
exposed metal has no return path to the chassis the reading must be            which the receiver is connected; Consult the dealer or an experi-
infinite. Any other abnormality that exists must be corrected before           enced radio/TV technician for help.
the receiver is returned to the customer.                                      The responsible party for this device's compliance is:
ELECTROSTATICALLY SENSITIVE DEVICES                                            Zenith Electronics Corporation
Some semiconductor (solid-state) devices can be damaged easily by              201 James Record Road
static electricity. Such components commonly are called Electro-               Huntsville, AL 35824, USA
statically Sensitive (ES) Devices. Examples of typical ES devices are          Digital TV Hotline: 1-800-243-0000
integrated circuits and some field-effect transistors and semicon-
ductor "chip" components. The following techniques should be
used to help reduce the incidence of component damage caused by
static electricity.




   CM154 - 923-03489                                                       2                                                   L15V26 - GENERAL
                                                      TABLE OF CONTENTS
PRODUCT SAFETY ................................................ 2
TABLE OF CONTENTS ............................................ 3
GENERAL INFO ................................................... 5
  SERVICE/WARRANTY ........................................ 5
  FEATURES ..................................................... 5
  SPECIFICATIONS ............................................. 5
  COMPUTER CONNECTION ................................... 6
  FRONT VIEW .................................................. 7
  BACK VIEW .................................................... 7
  REMOTE CONTROL ........................................... 8
USER MENUS ..................................................... 9
  CHANNEL ...................................................... 9
  TIMER .......................................................... 9
  VIDEO ........................................................ 10
  SOUND ....................................................... 11
  SPECIAL ..................................................... 11
SERVICING ...................................................... 15
  TROUBLESHOOTING ....................................... 15
  ADJUSTMENTS .............................................. 16
  VIDEO MODE SETTINGS .................................. 17
  ADJUSTMENT OPTIONS ................................... 18
PARTS ............................................................ 22
  MODEL PARTS .............................................. 22
  COMPONENT PARTS ....................................... 22
DIAGRAMS ...................................................... 27
  EXPLODED VIEW ........................................... 27
  WIRING DIAGRAM ........................................ 28
  BLOCK DIAGRAM .......................................... 29
PCB LAYOUTS ................................................... 30
  MAIN PCB LAYOUT TOP .................................. 30
  MAIN PCB LAYOUT BOTTOM ............................ 31
  CONTROL PANEL PCB LAYOUT .......................... 32
  POWER SWITCH PCB LAYOUT ........................... 32
SCHEMATICS .................................................... 33
  L15V26 MAIN MICRO CIRCUIT 1/2 .................. 33
  L15V26 SIGNAL CIRCUIT 2/2 ......................... 34




  CM154 - 923-03489                                                     3   L15V26 - SERVICING
-4-
                                              GENERAL INFO
GENERAL INFO                                                   NTSC TUNER
                                                                  Accepts standard United States broadcast video
SERVICE/WARRANTY
                                                                  signals as designated by the National Television
This model is a Factory Service Repair model (in and out          Standards Committee.
of warranty) and is covered by a one year limited
                                                               HI-RES COMPONENT VIDEO
warranty. For service, the end user should call 1-800-
984-9349 for complete shipping and handling                       Delivers the highest quality picture by breaking down
instructions (or call 1-877-9ZENITH). Refer to the last           video data into three separate signals--red, blue and
page of the opguide for more information.                         luminance--before the data is sent to the television.
                                                               PARENTAL CONTROL W/V-CHIP
FEATURES                                                          Programmable feature that uses the US standard
15.1" HDTV/PC MONITOR                                             content advisory system to exclude viewing of specific
   Truly Flat LCD screen delivers razor sharp images              programs or program types.
BUILT IN NTSC TUNER                                            SPECIFICATIONS
   Accepts cable/antenna, HDTV, satellite dish, and NTSC       CABINET
   video sources
                                                                 W x H x D (Monitor) ............... 15.3" x 15.2" x 6.9"
PC TO TV AT THE TOUCH OF A BUTTON
                                                                 Weight ................................................. 11.7 lbs.
   Innovative technology provides unsurpassed
   versatility                                                   Dimensions with Packaging
1024 X 768 RESOLUTION                                            W x H x D ........................... 19.0" x 19.5" x 10.1"
   High resolution format produces extremely detailed            Weight ...................................................... 16.5
   imagery                                                       UPC Code ..................................... 4464200392 0
350:1 HIGH CONTRAST RATIO                                         Finish ................................................ Silver Gray
   LCD technology emits sharp contrast between light           VIDEO
   and dark images
                                                                 Screen Size ................................................ 15.1"
430 CD/M2 HIGH BRIGHTNESS
                                                                 Flat ............................................................. Yes
   Renders an incredibly bright picture, even in light-
   drenched environments                                         Resolution Display ..................... 1024 x 768 (XGA)
140 X 120 DEGREES VIEWING ANGLE                                  Color Depth ...................................... 16M (8-Bit)
   Allows for distortion-free viewing from almost any            Aspect Ratio ................................................. 4:3
   angle                                                         Contrast Ratio ........................................... 350:1
HI-RES COMPONENT, RGB, S-VIDEO, RF, AV INPUTS                    Brightness ......................................... 430 cd/m2
   Multiple inputs for DVD players, VCRs, computers, and         High Drive Video Watts. ................................ 50W
   video game systems
                                                                 Viewing Angle ................................... 140



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