62SX4D_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 : NB-05EB
MODEL : 62SX4D
62SX4D-UB
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
-2 -
TABLE OF CONTENTS
DESCRIPTION OF CONTROLS ...........................................4
SPECIFICATIONS.................................................................9
ADJUSTMENT INSTRUCTION...........................................10
BLOCK DIAGRAM...............................................................23
EXPLODED VIEW...............................................................24
EXPLODED VIEW PARTS LIST .........................................25
REPLACEMENT PARTS LIST ............................................26
SCHEMATIC DIAGRAM..........................................................
PRINTED CIRCUIT BOARDS .................................................
-3 -
DESCRIPTION OF CONTROLS
Controls
Front Panel Controls
POWER TV GUIDE
MENU
ENTER
VOL
CH
Memory Card
Slots 1,2
POWER Button
TV GUIDE Button
MENU Button
ENTER Button
VOLUME (
F
,
G
)
Buttons
CHANNEL (
E
,
D
)
On operating the
mode
Buttons
Operation Indicator/
Lamp Indicator/
Temperature Indicator
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.
Off
Red
Green
Red (flashing)
Orange (flashing)
Orange
Red (flashing)
Green (flashing)
Orange
Temperature Indicator
Red
Red (flashing)
Power Cord is not connected.
Power Cord is connected, TV is in standby mode.
TV turns on.
Power Cord is connected, TV is in booting sequence.
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 shuts down due to overheating.
The projection TV shuts down, check the cooling fan.
Contact your service center.
Operation Indicator
Lamp Indicator
-4 -
DESCRIPTION OF CONTROLS
Connection Options
Back Connection Panel
UPGRADE PORT
RGB
PC/DTV
(XGA/
480p/
720p
1080i)
RGB/DVI
Y
P
B
P
R
PC/DTV
(XGA/
480p/
720p
/
1080i)
DVI
DTV/DVD
DIGITAL AUDIO OPTICAL
OUTPUT
Used to connect either an exter-
nal amplifier, or add a sub-
woofer to your surround sound
system if it has a digital
audio optical input.
(Refer to
1
)
DIGITAL AUDIO OPTI-
CAL INPUT1(COMPO-
NENT2)
Connect digital audio
from the equipment
whose video is connect-
ed to COMPONENT 2.
DIGITAL AUDIO OPTI-
CAL INPUT2(DVI)
Connect digital audio
from the equipment
whose video is connect-
ed to
HDMI/DVI(VIDEO).
(Refer to
2
)
CableCARD™
Used for CableCARD™
received Cable Service
Provider.
IEEE1394
Connect DVHS or
MicroMV to IEEE1394
Connector.
G-LINK
Connect a G-
LINK Cable to
this jack.
ANTENNA Inputs
CABLE Inputs
Connect antenna sig-
Connect cable signals to
nals to the TV directly.
the TV, either directly or
through your cable box.
ANTENNA
G-LINK
RGB Input
Connect the TV output
connector from a PC/DTV
to the appropriate input
port.
S-VIDEO In
A connection available
with some high-end
equipment that provides
even better picture qual-
ity for Video 2.
VIDEO 1 or 2
Connects the video sig-
nals from various types
of equipment.
Left/Right AUDIO
Used for stereo sound
from various types of
equipment.
MONITOR OUTPUT
Connect a second TV or
Monitor.
DIGITAL AUDIO
OPTICAL OUTPUT
UPGRADE
PORT
RGB INPUT
C
a
b
l
e
C
A
R
D
DIGITAL AUDIO
OPTICAL INPUT1
(COMPONENT2)
CABLE
DIGITAL AUDIO
OPTICAL INPUT2
(DVI)
COMPONENT
INPUT2 INPUT1
PC/DTV
(XGA
/480p
/720p
/1080i)
RGB/DVI INPUT
(L)
S-VIDEO
MONITOR VIDEO
OUTPUT INPUT2
VIDEO
INPUT1
VIDEO
Y
IEEE-1394
P
B
HDMI1
/DVI
AUDIO
(R)
MONO
(L)
AUDIO
(R)
P
R
(L)
HDMI2
(L)
AUDIO
(R)
VARIABLE
AUDIO OUT
AUDIO
(R)
DTV/DVD INPUT
HDMI1/DVI, HDMI 2
Connect a HDMI signal
to HDMI1/DVI or
COMPONENT INPUT 1-2
HDMI2. Or connect a
Connect a component
DVI(Video) signal to
video/audio device to
HDMI1/DVI.
these jacks. Refer to your
DVD manual for further
information.
RGB/DVI INPUT
Connect the monitor
output connector from
a PC to the appropri-
ate input port.
VARIABLE AUDIO OUT
Used to connect either
an external amplifier,
or add a sub-woofer to
your surround sound
system.
Notes:
1
In standby mode, these port will not work.
2
If the video is connected through HDMI-TO-HDMI cable, you don’t need to connect digital audio. This port
is used only when the video connected through DVI-TO-HDMI cable.
-5 -

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