Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_DU-37LZ30_[SM]

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LG_DU-37LZ30_[SM]


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                                                  website:http://biz.LGservice.com
                                  e-mail:http://www.LGEservice.com/techsup.html




LCD TV
SERVICE MANUAL
CHASSIS : AL-03HA

MODEL : DU-37LZ30
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
                                          CONTENTS




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

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

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

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

SVC REMOTE CONTROLLER................................................................12

TROUBLE SHOOTING ............................................................................13

BLOCK DIAGRAM...................................................................................16

WIRING DIAGRAM ..................................................................................18

EXPLODED VIEW .................................................................................. 19

EXPLODED VIEW PARTS LIST ..............................................................20

REPLACEMENT PARTS LIST ............................................................... 21

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




                                                   -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 Replacement Parts List.
 It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
 X-RADIATION, Shock, Fire, or other Hazards.
 Do not modify the original design without permission of manufacturer.


General Guidance                                                      Before returning the receiver to the customer,

An isolation Transformer should always be used during the             always perform an AC leakage current check on the exposed
servicing of a receiver whose chassis is not isolated from the AC     metallic parts of the cabinet, such as antennas, terminals, etc., to
power line. Use a transformer of adequate power rating as this        be sure the set is safe to operate without damage of electrical
protects the technician from accidents resulting in personal injury   shock.
from electrical shocks.
                                                                      Leakage Current Cold Check(Antenna Cold Check)
It will also protect the receiver and it's components from being      With the instrument AC plug removed from AC source, connect an
damaged by accidental shorts of the circuitry that may be             electrical jumper across the two AC plug prongs. Place the AC
inadvertently introduced during the service operation.                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
If any fuse (or Fusible Resistor) in this TV receiver is blown,       each exposed metallic parts such as antenna terminals, phone
replace it with the specified.                                        jacks, etc.
                                                                      If the exposed metallic part has a return path to the chassis, the
When replacing a high wattage resistor (Oxide Metal Film Resistor,    measured resistance should be between 1M and 5.2M.
over 1W), keep the resistor 10mm away from PCB.                       When the exposed metal has no return path to the chassis the
                                                                      reading must be infinite.
Keep wires away from high voltage or high temperature parts.          An other abnormality exists that must be corrected before the
                                                                      receiver is returned to the customer.
Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube. Do          Leakage Current Hot Check (See below Figure)
not lift the Picture tube by it's Neck.                               Plug the AC cord directly into the AC outlet.
                                                                      Do not use a line Isolation Transformer during this check.
X-RAY Radiation                                                       Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
                                                                      between a known good earth ground (Water Pipe, Conduit, etc.)
Warning:                                                              and the exposed metallic parts.
                                                                      Measure the AC voltage across the resistor using AC voltmeter
                                                                      with 1000 ohms/volt or more sensitivity.
 The source of X-RAY RADIATION in this TV receiver is the High        Reverse plug the AC cord into the AC outlet and repeat AC voltage
 Voltage Section and the Picture Tube.                                measurements for each exposed metallic part. Any voltage
 For continued X-RAY RADIATION protection, the replacement            measured must not exceed 0.75 volt RMS which is corresponds to
 tube must be the same type tube as specified in the                  0.5mA.
 Replacement Parts List.                                              In case any measurement is out of the limits specified, there is
                                                                      possibility of shock hazard and the set must be checked and
To determine the presence of high voltage, use an accurate high       repaired before it is returned to the customer.
impedance HV meter.
                                                                      Leakage Current Hot Check circuit
Adjust brightness, color, contrast controls to minimum.
Measure the high voltage.
The meter reading should indicate                                                           AC Volt-meter
23.5 



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