Service Manuals, User Guides, Schematic Diagrams or docs for : LG LED 32LE5500 1-LG-32LN5300

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1-LG-32LN5300


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            LED TV
            SERVICE MANUAL
            CHASSIS : LA32B

            MODEL : 32LN5300                     32LN5300-UB
            CAUTION
            BEFORE SERVICING THE CHASSIS,
            READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




P/NO : MFL67647401 (1212-REV00)                                Printed in Korea
                                          CONTENTS




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

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

SPECIFICATION ....................................................................................... 4

ADJUSTMENT INSTRUCTION ................................................................ 9

TROUBLE SHOOTING ............................................................................ 16

BLOCK DIAGRAM.................................................................................. 22

EXPLODED VIEW .................................................................................. 24

SCHEMATIC CIRCUIT DIAGRAM ..............................................................




                                                  -2-
                                                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,

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 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 1 M and 5.2 M.
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 



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