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CANADA : http//biz.lgservice.com
USA : http//www.lgservice.com
: http//biz.lgservice.com
PLASMA TV
SERVICE MANUAL
CHASSIS : PA-61B
MODEL : 42PC1DA 42PC1DA-UB
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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 lsolation 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 circuitary that may be voltage measurements for each esposed 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 sepcified, there is
it with the same specified type. 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
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. Good Earth Ground
Place the AC switch in the on positioin, connect one lead of such as WATER PIPE,
ohm-meter to the AC plug prongs tied together and touch other To Instrument's CONDUIT etc.
ohm-meter lead in turn to each exposed metallic parts such as 0.15uF
exposed
antenna terminals, phone jacks, etc. METALLIC PARTS
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 1.5 Kohm/10W
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
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.................................................................8
ADJUSTMENT INSTRUCTIONS ..........................................9
BLOCK DIAGRAM...............................................................17
EXPLODED VIEW...............................................................30
EXPLODED VIEW PARTS LIST .........................................31
REPLACEMENT PARTS LIST ............................................32
SCHEMATIC DIAGRAM..........................................................
PRINTED CIRCUIT BOARDS .................................................
- 3 -
DESCRIPTION OF CONTROLS
CONTROLS
This is a representation of the front panel of models 42PC1DA series TVs.
Here shown may be somewhat different from your TV.
Front Panel Controls
TV GUIDE INPUT MENU VOL CH
TV
Remote Control POWER GUIDE INPUT MENU VOLUME CHANNEL
Sensor Button Button Button Button (F,G)Buttons (E,D)Buttons
Power Standby Indicator
Illuminates red in stand-
by mode.
When the TV is turned
on, the indicator blinks
white and then illumi-
nates white before the
picture is displayed.
- 4 -
DESCRIPTION OF CONTROLS
CONNECTION OPTION
This is a back panel of 42PC1DA.
Back Connection Panel
S-VIDEO Input
Provides better picture quality than
the video input.
AUDIO Input
Cable CARD
Connections are available for listen-
ing to stereo sound from an external
device.
CableCARDTM VIDEO Input
Used for Connects the video signal from a
10
CableCARDTM video device.
Cable Service
AV OUT
Provider.
1
2 (MONO)
3
VIDEO AUDIO S-VIDEO VIDEO AUDIO
AV IN 1 COMPONENT IN
7
ANTENNA
IN
4 5 6 8 9
RGB IN REMOTE
CABLE CONTROL IN
HDMI IN DIGITAL AUDIO RS-232C IN IN
OUT (CONTROL & SERVICE)
AUDIO (RGB/DVI)
2 OPTICAL
RGB (PC/DTV)
(PC/
1 (DVI)
1 AV OUT 6 RS-232C IN (CONTROL & SERVICE) PORT
Connect a second TV or monitor. Connect to the RS-232C port on a PC.
2 AV (Audio/Video) IN 1 7 ANTENNA IN
Connect audio/video output from an external Connect over-the air signals to this jack.
device to these jacks. CABLE IN
S-VIDEO Connect cable signals to this jack.
Connect S-Video out from an S-VIDEO device.
8 RGB/AUDIO IN
3 COMPONENT IN Connect the monitor output from a PC to the
Connect a component video/audio device to these appropriate input port.
jacks.
9 Remote Control Port
4 HDMI IN Connect your wired remote control.
Connect a HDMI signal to 1(DVI) or 2.
Or DVI(VIDEO)signal to the 1(DVI) port with a DVI 10 Power Cord Socket
to HDMI cable. For operation with AC power.
Caution:
5 DIGITAL AUDIO OUT Never attempt to operate the TV on DC power.
Connect digital audio from various types of equipment.
Note: In standby mode, these ports do not work.
- 5 -
DESCRIPTION OF CONTROLS
REMOTE CONTROL KEY FUNCTIONS
When using the remote control, aim it at the remote control sensor on the TV.
MODE Select the remote operating mode: TV, DVD, VCR,
AUDIO, CABLE or STB. TV INPUT INPUT
POWER
VCR/DVD Control video cassette recorders or DVD players.
control buttons TV
DVD
VCR
MODE
DAY+/DAY- Move the Listings Grid forward or backward in 24 CABLE STB
hour increments. AUDIO
MENU Displays the main menu. Enters or exits a Panel
Menu in the TV Guide On Screen system.
DAY - DAY+
INFO i
INFO Display information at the top of the screen. MENU
TV GU
IDE
TV GUIDE Displays the TV Guide On Screen system.
ENTER
THUMBSTICK Navigate the on-screen menus and adjust the sys-
(Up/Down/Left
Right/ENTER) tem settings to your preference.
EXIT
EXIT Clear all on-screen displays and return to TV view- SAP CC RAT
IO
ing from any menu.
PAGE
SAP Analog mode: Selects MTS sound(Mono, Stereo, and a SAP)
DTV mode: Change the audio language. VOL MUTE FAV CH
PAGE
CC Select a closed caption.
(*In DTV/CADTV mode
1 2 3
RATIO Change the aspect ratio. 4 5 6
VOLUME UP Increase/decrease the sound level. 7 8 9
/DOWN
0 FLASHBK
MUTE Switch the sound on or off.
FAV Scroll through the programmed Favorite channels.
CHANNEL Select available channels. APM
UP/DOWN
AUTO DEMO M/C EJECT
PAGE UP/ Move from one full set of screen information to the CC
PAGE DOWN next one.
NUMBER but-
-- (DASH) Used to enter a program number for multiple pro-
gram channels such as 2-1, 2-2, etc.
FLASHBK Tune to the last channel viewed.
- 6 -
DESCRIPTION OF CONTROLS
POWER Turns your TV or any other
programmed equipment on or
off, depending on the mode.
In AV 1-2, Component 1-2,
TV INPUT
RGB-DTV (or RGB-PC),
HDMI1/DVI, and HDMI2 input
sources, screen returns to the
last TV channel.
External input modes rotate in
regular sequence: Antenna,
INPUT
Cable, AV1-2, Component 1-
2, RGB-DTV (or RGB-PC),
HDMI1/DVI and HDMI2 (AV 1-
2, Component 1-2, RGB-DTV
(or RGB-PC), HDMI1/DVI,
and HDMI2 input sources are
linked automatically, only if
these are connected ).
Inside the Sliding Cover
TIMER Select the amount of time before your TV turns off auto-
matically.
APM Compare the Daylight, Normal, Night Time and
User1(or2) on the screen.
ADJUST Adjust the screen position,size,and phase in PC mode.
7 8 9
PIP Switches the sub picture PIP, POP, Twin
picture or off mode.
0 FLASHBK
PIPCH- Changes the PIP channel.
/PIPCH+
PIP PIP CH - PIP CH + PIP INPUT
Select the connected input source for the
PIP INPUT sub-picture.
TIMER APM ADJUST SWAP
Exchange the main/sub images.
EZ PIC EZ SOUND SWAP
Adjust the factory preset picture depend
EZ PIC on the viewing environment.
Select the appropriate type of sound for
EZ SOUND type of program.
- 7 -
SPECIFICATIONS
42PC1DA
MODELS
(42PC1DA-UB)
including stand 44.4 x 29.5 x 15.0 inches
Dimensions 1129.0 x 748.5 x 380.0 mm
(Width x Height x Depth) excluding stand 44.4 x 27.4 x 4.1 inches
1129.0 x 695.0 x 103.7 mm
Weight including stand 61.1 pounds / 27.7 kg
excluding stand 53.4 pounds / 24.2 kg
Power requirement AC100-240V ~ 50/60Hz
Television System NTSC-M, ATSC, 64 & 256 QAM
Program Coverage VHF 2-13, UHF 14-69, CATV 1-135, DTV 2-69, CADTV 1-135
External Antenna 75 ohm
Impedance
Operating Temperature 32 ~ 104