Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_RU-20LA61_[SM]

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LG_RU-20LA61_[SM]


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




LCD TV
SERVICE MANUAL
CHASSIS : ML-012B

MODEL : RU-20LA61
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




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

                                                                                           AC Volt-meter




                                                                                                               Good Earth Ground
                                                                                                               such as WATER PIPE,
                                                                       To Instrument's                         CONDUIT etc.
                                                                                                 0.15uF
                                                                       exposed
                                                                       METALLIC PARTS


                                                                                             1.5 Kohm/10W




                                                               - 2 -
                                                       TABLE OF CONTENTS

SPECIFICATIONS.................................................................4


DESCRIPTION OF CONTROLS ...........................................5


ADJUSTMENT INSTRUCTIONS ..........................................9


PRINTED CIRCUIT BOARD ...............................................10


BLOCK DIAGRAM...............................................................13


EXPLODED VIEW...............................................................14


EXPLODED VIEW PARTS LIST .........................................15


REPLACEMENT PARTS LIST ............................................16


SCHEMATIC DIAGRAM..........................................................




                                                                               - 3 -
                                       SPECIFICATIONS

Model                                    RU-15LA61                RU-20LA61



        Horizontal size (Inches)         18.3                          22.8
        Height (Inches)                  14.8                          18.3
        Thickness (Inches)                6.7                           8
        Weight (pounds)                  13.9                          21.6


Power requirements                       DC 12V/4.5A                     DC 15V/4.5A


Television system                        NTSC


Television channels                      VHF : 2 ~ 13, UHF : 14 ~ 69
                                         Cable : 01 ~ 125


Television Screen                        LCD Panel


External antenna impedance               75 


Power consumption                        50 W                                  70 W


Audio output                             3W+3W                                5W+5W


Adapter (DC power)                     In     : AC 100-240V ~ 1.5A-0.6A
                            In: AC 100-240V ~ 1.5A-0.6A      In: AC 100-240V ~ 1.6A-0.7A
                               50/60Hz          50/60Hz, 115~180VA
                                                                50/60Hz
                                       Out    : DC 12V, 5A
                            Out: DC 12V, 5A                  Out: DC 15V, 4.5A

                           For use only with Model No.    For use only with Model No.
        * CAUTION : For use only with Model No. SAD6012SE AC Adapter, manufactured by H &
                    E co., Ltd.
                           SAD6012SE AC Adapter, man-     SAD7015SE AC Adapter,
                           ufactured by H & E co., Ltd.   manufactured by H & E co., Ltd.


Power supply cordset               :     Standard North America three wire earth-grounding with
                                         flexible cord SJT type or higher type.

         * CAUTION : If replacement becomes necessary, replace with an exact duplicate.
                       Contact any LG authorized service center.




                                                - 4 -
         DESCRIPTION OF CONTROLS


Front of the TV




                                                               ST
                                                       MONO            SAP   DPM
                                                              STEREO




                                         ST
                           MONO                      SAP                           DPM
                                       STEREO




                                 Stereo Indicator
                                                SAP Indicator
                        Mono Indicator                                  DPM Indicator
                                                                 (RU-15LA61 Only)


                  Power/Standby indicator
                  Illuminates red in standby mode, Illuminates
                  green when the TV is turned on.


             Remote Control Sensor




                               - 5 -
                             DESCRIPTION OF CONTROLS

   Back of the TV




                                                                                                                        * Kensington
                                                                                                                          Security System
                                                                                                                          Connector




      RU-15LA61                                                                  PC Input     PC sound Input                        DC 12V Input




                   ANT IN       Y        PB         PR          L           R      PC INPUT    PC     VIDEO (MONO) L   AUDIO   R       DC 12V
                   +75                                                                        SOUND
                             COMPONENT(480i/480p/720p/1080i)        AUDIO                                 VIDEO IN
                                               DVD/DTV IN




                Antenna Input              DVD/DTV IN                                                  Audio/Video Input
                                           (Component (480i/480p/720p/1080i),
      RU-20LA61                            AUDIO) Input                                                                            DC 15V Input




                                                                                                                                      DC IN (15V)
                    ANT IN      Y         PB        PR          L           R                         VIDEO (MONO) L   AUDIO   R
                    +75 
                              COMPONENT(480i/480p/720p/1080i)       AUDIO                                 VIDEO IN
                                                DVD/DTV IN




- This manual mainly explains the features for the RU-15LA61




                                                                                - 6 -
                      DESCRIPTION OF CONTROLS

Side of the TV




                                                                           Side Control Panel



                                                                             ch       Channel Buttons


                                               ST
                                       MONO            SAP   DPM
                                              STEREO




                                                                             vol      Volume Buttons



                                                                            enter     Enter Button
 Side Connection Panel
                                                                            menu      Menu Button

                                                                              tv
                                                                                      TV



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