Service Manuals, User Guides, Schematic Diagrams or docs for : LG TV RE-44SZ21RD[1].part1

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

DLP Projection TV
SERVICE MANUAL
CHASSIS : MB-02JB

MODEL : RE/RL-44SZ21RD
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

Jul.,2003 AV4

R AUDIO L/MONO VIDEO S-VIDEO TV/AV MENU OK VOL PR
ON/OFF

P/NO : 3828VD0133L Printed in Korea
CONTENTS

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

SAFETY PRECAUTIONS ................................................................................................3

SERVICING PRECAUTIONS .......................................................................................... 4

CONTROL DESCRIPTIONS ............................................................................................6

REPLACINIG LAMP ......................................................................................................10

SPECIFICATIONS ..........................................................................................................11

ADJUSTMENT INSTRUCTIONS ....................................................................................16

BLOCK DIAGRAM..........................................................................................................18

PRINTED CIRCUIT BOARD ...........................................................................................22

EXPLODED VIEW ......................................................................................................... 30

EXPLODED VIEW PARTS LIST .....................................................................................31

REPLACEMENT PARTS LIST .......................................................................................32

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

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

Good Earth Ground
such as WATER PIPE,
Leakage Current Cold Check(Antenna Cold Check) To Instrument's CONDUIT etc.
With the instrument AC plug removed from AC source, 0.15uF
exposed
connect an electrical jumper across the two AC plug prongs. METALLIC PARTS
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 1.5 Kohm/10W
antenna terminals, phone jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1M and 5.2M.
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.

- 3 -
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service transistors and semicounductor "chip" components. The
manual and its supplements and addenda, read and follow the following techniques should be used to help reduce the
SAFETY PRECAUTIONS on page 3 of this publication. incidence of component damage caused by static by static
NOTE: If unforeseen circumstances create conflict between the electricity.
following servicing precautions and any of the safety 1. Immediately before handling any semiconductor component
precautions on page 3 of this publication, always follow the or semiconductor-equipped assembly, drain off any
safety precautions. Remember: Safety First. electostatic charge on your body by touching a known earth
ground. Alternatively, obtain and wear a commercially
General Servicing Precautions available discharging wrist strap device, which should be
1. Always unplug the receiver AC power cord from the AC removed to prevent potential shock reasons prior to
power source before; applying power to the unit under test.
a. Removing or reinstalling any component, circuit board 2. After removing an electrical assembly equipped with ES
module or any other receiver assembly. devices, place the assembly on a conductive surface such as
b. Disconnecting or reconnecting any receiver electrical plug aluminum foil, to prevent electrostatic charge buildup or
or other electrical connection. exposure of the assembly.
c. Connecting a test substitute in parallel with an electrolytic 3. Use only a grounded-tip soldering iron to solder or unsolder
capacitor in the receiver. ES devices.
CAUTION: A wrong part substitution or incorrect 4. Use only an anti-static type solder removal device. Some
polarity installation of electrolytic capacitors may result solder removal devices not classified as "anti-static" can
in an explosion hazard. generate electrical charges sufficent to demage ES devices.
d. Discharging the picture tube anode. 5. Do not use freon-propelled chemicals. These can generate
2. Test high voltage only by measuring it with an appropriate electrical charges sufficient to damage ES devices.
high voltage meter or other voltage measuring device (DVM, 6. Do not remove a repalcement ES device from its protective
FETVOM, etc) equipped with a suitable high voltage probe. package until immediately before you are ready to install it.
Do not test high voltage by "drawing an arc". (Most replacement ES devices are packaged with leads
3. Discharge the picture tube anode only by (a) first connecting electrically shorted together by conductive foam, aluminum
one end of an insulated clip lead to the degaussing or kine foil or comparable conductive material).
aquadag grounding system shield at the point where the 7. Immediately before removing the protective material from
picture tube socket ground lead is connected, and then (b) the ieads of a replacement ES device, touch the protective
touch the other end of the insulated clip lead to the picture material to the chassis or circuit assembly into which the
tube anode button, using an insulating handle to avoid device will be installed.
personal contact with high voltage. CAUTION:Be sure no power is applied to the chassis or
4. Do not spray chemicals on or near this receiver or any of its circuit, and observe all other safety precautions.
assemblies. 8. Minimize bodily motions when handling unpackaged
5. Unless specified otherwise in this service manual, clean replacement ES devices. (Otherwise harmless motion such
electrical contacts only by applying the following mixture to as the bruching together of your clothes fabric or the lifting
the contacts with a pipe cleaner, cotton-tipped stick or of your foot from a carpeted floor can generate static
comparable nonabrasive applicator; 10% (by volume) electricity sufficient to damage an ES device.)
Acetone and 90% (by volume) isopropyl alcohol (90%-99%
strength) General Soldering Guidelines
CAUTION: This is a flammable mixture. 1. Use a grounded-tip, low-wattage soldering iron and
Unless specified otherwise in this service manual, lubrication appropriate tip size and shape that will maintan tip
of contacts in not required. temperature within the range or 500

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