42PC1D-UB, 42PC1DA-UB (CHASSIS:PA-61B) — LG TV Service Manual (repair manual)

Model
42PC1D-UB 42PC1DA-UB (CHASSIS:PA-61B)
Pages
46
Size
27.82 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
42pc1d-ub-42pc1da-ub-chassis-pa-61b.pdf
Date

View LG 42PC1D-UB / 42PC1DA-UB (CHASSIS:PA-61B) Service Manual online

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PA-61B
MODEL : 42PC1D
/D
A   
42PC1
D/
DA-UB
- 2 -
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 monitor is blown, replace
it with the same specified type.
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 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
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
1.5 Kohm/10W
To Instrument's
exposed 
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF
- 3 -
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 .................................................
TABLE OF CONTENTS
- 4 -
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
   
   
CH
CH
V
VOL
OL
MENU
MENU
INPUT
INPUT
TV GUIDE
TV GUIDE
Remote Control 
Sensor
POWER
Button
TV
GUIDE
Button
INPUT
Button
MENU
Button
VOLUME
(
F
F
,
G
G
)Buttons
CHANNEL
(
E
E
,
D
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.
DESCRIPTION OF CONTROLS
- 5 -
CONNECTION OPTION
Back Connection Panel
Cable CARD
HDMI IN
HDMI IN
DIGITAL AUDIO 
DIGITAL AUDIO 
OUT
OUT
O
OPTICAL
PTICAL
2
2
1 (DVI)
1 (DVI)
RS-232C IN
RS-232C IN
(CONTROL
(CONTROL  &&  SERVICE)
SERVICE)
RGB (PC
RGB (PC//DTV)
DTV)
RGB IN
RGB IN
AUDIO (RGB/DVI)
AUDIO (RGB/DVI)
COMPONENT IN
COMPONENT IN
VIDEO
VIDEO
AUDIO
AUDIO
VIDEO
VIDEO
AUDIO
AUDIO
MONO
((            
            ))
S-VIDEO
S-VIDEO
AV IN 1
AV IN 1
AV OUT
AV OUT
ANTENNA
ANTENNA
IN
IN
CABLE
CABLE
IN
IN
REMOTE
REMOTE
CONTROL IN
CONTROL IN
S-VIDEO Input
Provides better picture quality than
the video input.
AUDIO Input
Connections are available for listen-
ing to stereo sound from an external
device.
VIDEO Input
Connects the video signal from a
video device.
CableCARD
Used for 
CableCARD
Cable Service 
Provider.
This is a back panel of 
42PC1DA
.
AV OUT
Connect a second TV or monitor.
AV (Audio/Video) IN 1  
Connect audio/video output from an external
device to these jacks.
S-VIDEO 
Connect S-Video out from an S-VIDEO device.
COMPONENT IN
Connect a component video/audio device to these
jacks.
HDMI IN
Connect a HDMI signal to 1(DVI) or 2.
Or DVI(VIDEO)signal to the 1(DVI) port with a DVI
to HDMI cable.
DIGITAL AUDIO OUT
Connect digital audio from various types of equipment. 
Note: In standby mode, these ports do not work.
RS-232C IN (CONTROL & SERVICE) PORT
Connect to the RS-232C port on a PC.
ANTENNA IN
Connect over-the air signals to this jack.
CABLE IN
Connect cable signals to this jack.
RGB/AUDIO IN
Connect the monitor output from a PC to the
appropriate input port.
Remote Control Port
Connect your wired remote control.
Power Cord Socket
For operation with AC power. 
Caution: 
Never attempt to operate the TV on DC power.
10
1
2
4
1
6
7
8
9
10
2
3
4
5
5
6
7
8
3
9
DESCRIPTION OF CONTROLS

Download LG 42PC1D-UB / 42PC1DA-UB (CHASSIS:PA-61B) Service Manual (Repair Manual)

Here you can view online or download LG 42PC1D-UB / 42PC1DA-UB (CHASSIS:PA-61B) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair LG 42PC1D-UB / 42PC1DA-UB (CHASSIS:PA-61B) Plasma. Information contained in LG 42PC1D-UB / 42PC1DA-UB (CHASSIS:PA-61B) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).