Service Manuals, User Guides, Schematic Diagrams or docs for : LG LED 32LE7500-SA chassis LJ03E LG_32LE7500-SA_Chassis_LJ03E_MFL63261801_1006-REV00

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LG_32LE7500-SA_Chassis_LJ03E_MFL63261801_1006-REV00


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                                                                   Internal Use Only
                                            North/Latin America   http://aic.lgservice.com
                                            Europe/Africa         http://eic.lgservice.com
                                            Asia/Oceania          http://biz.lgservice.com




            LED LCD TV
            SERVICE MANUAL
            CHASSIS : LJ03E

            MODEL : 32LE7500                      32LE7500-SA


            CAUTION
            BEFORE SERVICING THE CHASSIS,
            READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




P/NO : MFL63261801 (1006-REV00)                                          Printed in Korea
                                                               CONTENTS




                CONTENTS .............................................................................................. 2

                PRODUCT SAFETY ................................................................................. 3

                SPECIFICATION ....................................................................................... 6

                ADJUSTMENT INSTRUCTION .............................................................. 12

                EXPLODED VIEW .................................................................................. 20

                SVC. SHEET ...............................................................................................




Copyright           LG Electronics. Inc. All right reserved.       -2-                                              LGE Internal Use Only
Only for training and service purposes
                                                SAFETY PRECAUTIONS

                                                   IMPORTANT SAFETY NOTICE
 Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
 Schematic Diagram and Exploded View.
 It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
 Shock, Fire, or other Hazards.
 Do not modify the original design without permission of manufacturer.


General Guidance                                                       Leakage Current Hot Check (See below Figure)
                                                                       Plug the AC cord directly into the AC outlet.
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC      Do not use a line Isolation Transformer during this check.
power line. Use a transformer of adequate power rating as this         Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
protects the technician from accidents resulting in personal injury    between a known good earth ground (Water Pipe, Conduit, etc.)
from electrical shocks.                                                and the exposed metallic parts.
                                                                       Measure the AC voltage across the resistor using AC voltmeter
It will also protect the receiver and it's components from being       with 1000 ohms/volt or more sensitivity.
damaged by accidental shorts of the circuitry that may be              Reverse plug the AC cord into the AC outlet and repeat AC voltage
inadvertently introduced during the service operation.                 measurements for each exposed metallic part. Any voltage
                                                                       measured must not exceed 0.75 volt RMS which is corresponds to
If any fuse (or Fusible Resistor) in this TV receiver is blown,        0.5 mA.
replace it with the specified.                                         In case any measurement is out of the limits specified, there is
                                                                       possibility of shock hazard and the set must be checked and
When replacing a high wattage resistor (Oxide Metal Film Resistor,     repaired before it is returned to the customer.
over 1 W), keep the resistor 10 mm away from PCB.
                                                                       Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.

Before returning the receiver to the customer,                                                AC Volt-meter

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                                                   Good Earth Ground
shock.                                                                                                            such as WATER PIPE,
                                                                         To Instrument's                          CONDUIT etc.
                                                                                                   0.15 uF
Leakage Current Cold Check(Antenna Cold Check)                           exposed
With the instrument AC plug removed from AC source, connect an           METALLIC PARTS
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                              1.5 Kohm/10W
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.                                                                When 25A is impressed between Earth and 2nd Ground
If the exposed metallic part has a return path to the chassis, the         for 1 second, Resistance must be less than 0.1 
measured resistance should be between 1 M and 5.2 M.
                                                                            *Base on Adjustment standard
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.




Copyright           LG Electronics. Inc. All right reserved.       -3-                                               LGE Internal Use Only
Only for training and service purposes
                                             SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service             2. After removing an electrical assembly equipped with ES
manual and its supplements and addenda, read and follow the                devices, place the assembly on a conductive surface such as
SAFETY PRECAUTIONS on page 3 of this publication.                          aluminum foil, to prevent electrostatic charge buildup or
NOTE: If unforeseen circumstances create conflict between the              exposure of the assembly.
following servicing precautions and any of the safety precautions on    3. Use only a grounded-tip soldering iron to solder or unsolder ES
page 3 of this publication, always follow the safety precautions.          devices.
Remember: Safety First.                                                 4. Use only an anti-static type solder removal device. Some solder
                                                                           removal devices not classified as "anti-static" can generate
General Servicing Precautions                                              electrical charges sufficient to damage ES devices.
1. Always unplug the receiver AC power cord from the AC power           5. Do not use freon-propelled chemicals. These can generate
   source before;                                                          electrical charges sufficient to damage ES devices.
   a. Removing or reinstalling any component, circuit board             6. Do not remove a replacement ES device from its protective
      module or any other receiver assembly.                               package until immediately before you are ready to install it.
   b. Disconnecting or reconnecting any receiver electrical plug or        (Most replacement ES devices are packaged with leads
      other electrical connection.                                         electrically shorted together by conductive foam, aluminum foil
   c. Connecting a test substitute in parallel with an electrolytic        or comparable conductive material).
      capacitor in the receiver.                                        7. Immediately before removing the protective material from the
      CAUTION: A wrong part substitution or incorrect polarity             leads of a replacement ES device, touch the protective material
      installation of electrolytic capacitors may result in an             to the chassis or circuit assembly into which the device will be
      explosion hazard.                                                    installed.
                                                                           CAUTION: Be sure no power is applied to the chassis or circuit,
2. Test high voltage only by measuring it with an appropriate high         and observe all other safety precautions.
   voltage meter or other voltage measuring device (DVM,                8. Minimize bodily motions when handling unpackaged
   FETVOM, etc) equipped with a suitable high voltage probe.               replacement ES devices. (Otherwise harmless motion such as
   Do not test high voltage by "drawing an arc".                           the brushing together of your clothes fabric or the lifting of your
3. Do not spray chemicals on or near this receiver or any of its           foot from a carpeted floor can generate static electricity
   assemblies.                                                             sufficient to damage an ES device.)
4. Unless specified otherwise in this service manual, clean
   electrical contacts only by applying the following mixture to the    General Soldering Guidelines
   contacts with a pipe cleaner, cotton-tipped stick or comparable      1. Use a grounded-tip, low-wattage soldering iron and appropriate
   non-abrasive applicator; 10 % (by volume) Acetone and 90 %              tip size and shape that will maintain tip temperature within the
   (by volume) isopropyl alcohol (90 % - 99 % strength)                    range or 500 



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