RU-44SZ63D_Service_Manual.pdf

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CANADA : http//biz.lgservice.com
USA
: http//www.lgservice.com
: http//lgservice.com/techsup.html
DLP PROJECTION TV
SERVICE MANUAL
CHASSIS : MB-042H
MODEL : RU-44SZ63D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SAFETY PRECAUTIONS
IMPORT
ANT 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
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 monitor 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.
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
AC Volt-meter
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.
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
0.15uF
1.5 Kohm/10W
CANADA: LG Electronics Canada, Inc. 550 Matheson
Boulevard East Mississauga, Ontario L4Z 4G3
USA
: LG Customer Interactive Center
P.O.Box 240007, 201 James Record Road Huntsville,
AL 35824
Digital TV Hotline 1-800-243-0000
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TABLE OF CONTENTS
SPECIFICATIONS.................................................................4
DESCRIPTION OF CONTROLS ...........................................5
ADJUSTMENT INSTRUCTION...........................................12
PRINTED CIRCUIT BOARDS .............................................19
BLOCK DIAGRAM...............................................................29
EXPLODED VIEW...............................................................36
EXPLODED VIEW PARTS LIST .........................................37
REPLACEMENT PARTS LIST ............................................38
SCHEMATIC DIAGRAM..........................................................
-3 -
SPECIFICATIONS
Product Specifications
Models
RU-44SZ63D
Horizontal Size (Inches)
Height (Inches)
Depth (Inches)
Weight (lbs.)
AC 120V, 60Hz
American TV Standard, NTSC, ATSC with STB
VHF: 2 - 13
UHF: 14 - 69
CATV: 1 - 125
240W
75 ohm External Terminal for VHF/UHF
12W x 2
Remote Control, 2 size AA batteries, 2 filters.
A/V input (3 set)
A/V output (1 set)
S-Video input (2)
Component input (2 set)
RGB input (1)
DVI input (1)
RGB/DVI audio input (1 set)
Variable audio output (1 set)
Audio center mode input (1)
Calibration port (1)
41.7
30.1
14.2
65
Power Requirement
Television System
Television Channels
Power Consumption (W)
Antenna
Audio Output (W)
Supplied Accessories
External Input/Output Ports
Design and specifications are subject to change without prior notice.
-4 -
DESCRIPTION OF CONTROLS
Function Status Indicators
Lamp indicator, operation indicator, and temperature indicator located below the front panel
controls, reveal the operating status of the DLP projection TV.
Operation Indicator
Temperature Indicator
Lamp Indicator
Operation Indicator
Off
Red
Green
Orange (flashing)
Orange
Red (flashing)
Green (flashing)
Orange
Lamp Indicator
Temperature Indicator
Red
Red (flashing)
Power cord is not connected.
Power Cord is connected, TV is in standby mode.
TV turns on.
Preparing operation in standby mode.
Projection lamp is reaching the end of its life and needs to
be replaced with a new lamp. Contact your service center.
There is a problem with the lamp or around it. Contact an
authorized service center.
The lamp cover is not closed.
The projection TV is overheating. Check the blocked vents of
the projection TV and the accumulated dust in the dust filter.
The projection TV shut down due to overheating.
The projection TV shut down, check the cooling fan. Contact
your service center.
-5 -

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