LG RU-13LA60 Service Manual

LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : ML-024C

MODEL : RU-13LA60

website:http://biz.LGservice.com

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

June, 2003

Printed in KoreaP/NO : 3828VD0131Z

SAFETY PRECAUTIONS

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

An lsolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.

It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitary that may be
inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube. Do not
lift the Picture tube by it's Neck.

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 positioin, 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 1MΩ and 5.2MΩ.
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.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each esposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to

0.5mA.
In case any measurement is out of the limits sepcified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.

Leakage Current Hot Check circuit

IMPORTANT SAFETY NOTICE

0.15uF

AC Volt-meter

To Instrument's
exposed
METALLIC PARTS

Good Earth Ground
such as WATER PIPE,
CONDUIT etc.

1.5 Kohm/10W

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

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

ADJUSTMENT INSTRUCTION.............................................8

BLOCK DIAGRAM.................................................................9

EXPLODED VIEW...............................................................10

EXPLODED VIEW PARTS LIST.........................................11

REPLACEMENT PARTS LIST............................................12

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

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

TABLE OF CONTENTS

SPECIFICATIONS

Model RU-13LA60

Horizontal size (inches) 13.6
Height (inches) 14.4
Depth (inches) 6.6
Weight (pounds) 10

Power requirements AC 110-240V ~ 50/60Hz

Television system NTSC
Television channels VHF : 2 ~ 13, UHF : 14 ~ 69

Cable : 1 ~ 125

Television Screen LCD Panel
Power consumption 45 W
Audio output 1 W + 1 W
External input ports Power cord socket (1)

Component (480i) input (1 set)
S-VIDEO input (1)
Headphone jack (1)
Video/Audio input (1 set)
Antenna input (1)

Power supply cord set Standard North America three wire earth-grounding

with flexible cord SJT type or higher type.

CAUTION: If replacing a part becomes necessary, replace the part with an exact duplicate.

Contact any LG authorized service center.

DESCRIPTION OF CONTROLS

ch

vol

menu

enter

on/off

tv

video

/ I

Front of the TVTV

Front of the

Side Control Panel

Side Control Panel

Channel Buttons

Volume Buttons

Enter Button

Menu Button

TV·Video Button

On/Off Button

Remote Control Sensor

Power/Standby indicator

Illuminates red in standby

mode, Illuminates green when

the TV is turned on.