Service Manuals, User Guides, Schematic Diagrams or docs for : LG Plasma 42PX3RVC 3828VD0209R-1

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

PLASMA TV
SERVICE MANUAL
CHASSIS : MF-056A

MODEL : 42PX3RVC/RV
42PX3RVC/RV-TA

CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

TV/AV MENU OK VOL PR
CONTENTS

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

DESCRIPTION OF CONTROLS ..........................................................................4

SPECIFICATIONS ................................................................................................8

ADJUSTMENT INSTRUCTIONS .......................................................................11

TROUBLE SHOOTING GUIDE ..........................................................................15

BLOCK DIAGRAM .............................................................................................24

EXPLODED VIEW ..............................................................................................26

EXPLODED VIEW PARTS LIST ........................................................................27

REPLACEMENT PARTS LIST...........................................................................28

SCHEMATIC DIAGRAM.........................................................................................

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

- 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 -
DESCRIPTION OF CONTROLS

- When using the remote control aim it at the remote control sensor of the set.
- There's maybe a defect in consecutive operation of remote control in specified brightness according to this set feature.

MUTE POWER
Switches the sound on or off. switches the set on from standby or
off to standby.
MULTIMEDIA MUTE POWER
Selects the Component, RGB or DVI I/II
modes. Selects the language during dual lan-
switches the set on from standby. guage broadcast.
TV/AV MULTIMEDIA I/II
Selects the sound output.
TV/AV
Selects the TV, AV, Component, RGB ARC
LIST ARC MENU Changes the picture format.
or DVI modes.
switches the set on from standby.
MENU
LIST Displays on screen menus one by
Displays the programme table. one.
Exits the current menu.
PR Memorizes menu changes.
D / E (Programme Up/Down) OK
selects a programme or a menu item. VOL VOL
switches the set on from standby.
PR
F / G (Volume Up/Down)
adjusts the volume.
adjusts menu settings. NUMBER buttons
OK
accepts your selection or displays the 1 2 3
current mode.
SSM
4 5 6 To select the sound appropriate to
your viewing programme character.
PSM 7 8 9
Adjusts the factory preset picture
according to the room.
PSM 0 SSM
SPLIT ZOOM SLEEP
Enlarge the screen with regular SPLIT ZOOM PIP/DW SLEEP Sets the sleep timer.
ration.
REVEAL PIP PR+ TEXT/
TEXT/
PIP/DW
Switches the sub picture on or off.
?
WIN. SIZE PIP PR- MIX
*
These buttons are used for teletext.
For further details, see the `Teletext'
Selects PIP or DW modes. section.
PIP PR + /- Note : In teletext mode, the PIP PR
Selects a programme for the sub picture. POSITION SWAP TIME
+/-, SWAP and PIP INPUT buttons are
SWAP used for teletext function.
Alternates between main and sub pic- HOLD PIP INPUT INDEX
ture. i
PIP INPUT
Selects the input mode for the sub pic- SWAP
ture. Returns to the previously viewed
programme.
WIN.SIZE Note : This function works only
Adjusts the sub picture size. when Favourite programme is set to
POSITION Off. Otherwise each press of this
Moves the sub picture to D / E or F / G button will select a stored favorite
direction. programme.

- 4 -

TV/AV MENU OK VOL PR

1 2 3 4 5 6 7

1. Remote Control Sensor 6. OK
Accepts your selection or displays the current mode.
2. Power Indicator
Illuminates red in standby mode, Illuminates green when the 7. D / E (Programme Up/Down)
set is turned on. Selects a programme or a menu item.
Switches the set on from standby.
3. Power Button F / G (Volume Up/Down)
Switches the set on from standby or off to standby. Adjusts the volume.
4. TV/AV Button Adjusts menu settings.
Selects the TV, AV, Component, RGB or HDMI modes.
Switches the set on from standby.

5. MENU
Displays on screen menus one by one.
Exits the current menu.
Memorizes menu changes.

- 5 -

A/V INPUT2
S-VIDEO

VIDEO
9

R AUDIO L/MONO
AC INPUT
VIDEO AUDIO VIDEO AUDIO

L R Antenna
L R
HDMI/ RGB INPUT COMPONENT INPUT 2 MONITOR OUTPUT
MONITOR
DVI(VIDEO) AUDIO INPUT
AUDIO

L R
VARIABLE AUDIO OUT
REMOTE RS-232C INPUT
CONTROL (CONTROL/SERVICE)
(MONO)

COMPONENT INPUT 1 A/V INPUT 1 S-VIDEO

1 2 3 4 5 6 7 8

1. HDMI(DVI VIDEO) / AUDIO INPUT / RGB INPUT 6. VARIABLE AUDIO OUTPUT
Connect the monitor output socket of the PERSONAL COM-
PUTER, DVD or STB to this socket. 7. ANTENNA INPUT
Note: If you want to use RGB/DVI audio, we strongly
recommend that you use the cable that has a core, or the 8. POWER CORD SOCKET
EMI Filter core along with separate cable. This the set operates on an AC power. The voltage is indicat-
ed on the Specifications page. Never attempt to operate the
2. CONTROL LOCK / REMOTE CONTROL set on DC power.

3. RS-232C INPUT(CONTROL/SERVICE) PORT 9. AUDIO/VIDEO INPUT (A/V INPUT 2)
Connect to the RS-232C port on a PC. S-VIDEO/AUDIO IN SOCKETS

4. COMPONENT INPUT
Connect DVD video outputs to Y, PB, PR of COMPONENT
INPUT and audio outputs to Audio sockets of AUDIO INPUT.

5. VIDEO/AUDIO IN/OUT SOCKETS (A/V INPUT 1)
Connect the video/audio out sockets of external equipment
to these sockets.
S-VIDEO/AUDIO IN SOCKETS
Connect the S-VIDEO out socket of an VCR to the S-VIDEO
socket.
Connect the audio out sockets of the VCR to the audio sock-
ets as in A/V INPUT 1.

- 6 -
Accessories
MUTE POWER

TV/AV MULTIMEDIA I/II

LIST ARC MENU

OK
VOL VOL

1 2 3

4 5 6

7 8 9

PSM 0 SSM

SPLIT ZOOM PIP/DW SLEEP

REVEAL PIP PR+ TEXT/
?
WIN. SIZE PIP PR- MIX

POSITION SWAP TIME

LG TV HOLD PIP INPUT INDEX
i

AS mark

Owner's Manual Remote Control handset 2-Eye Bolts

1.5V
1.5V

Alkaline batteries Power Cord 2-Wall brackets

Joinning the TV assembly to the wall to protect the set tumbling
- Secure the TV assembly by joinning it to a wall by using the Eye Bolts/Wall brackets.

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