Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_42PX4R_MF-056A_[SM]
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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 : 42PX4R
42PX4R-ZA
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 ................................................................................................9
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
Remote Control Key Functions
- 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.
TV/AV POWER
Selects the TV, AV, Component, RGB or switches the set on from standby or off to
HDMI modes. TV/AV MULTIMEDIA standby.
switches the set on from standby. POWER
MULTIMEDIA
MODE DVD
VCR
Selects the Component, RGB or HDMI
TV
Selects another device. MODE
modes.
CABLE
AUDI
O STB switches the set on from standby.
ZOOM - / ZOOM +
ZOOM - ZOOM +
Enlarges or reduces the main picture size. PIP
MU
TE MUTE
SLEEP LIST Switches the sound on or off.
SLEEP TEX
T/
* I/II
Sets the sleep timer. I/II
U
ARC
EXIT
Selects the language during dual lan-
MEN
guage broadcast.
MENU Selects the sound output.
Displays on screen menus one by one.
Exits the current menu. LIST
Memorizes menu changes. OK Displays the programme table.
PIP EXIT
Switches the sub picture on or off. Clears all on-screen displays and returns
Selects PIP or DW modes. PIP
to TV viewing from any menu.
PR UT
INP
PIP PR + /- -
PIP PR + SWAP
PIP
Selects a programme for the sub picture.
SWAP ARC
Alternates between main and sub picture. Changes the picture format.
VOL SSM PSM PR
PIP INPUT
Selects the input mode for the sub picture. OK
SIZE accepts your selection or displays the cur-
Adjusts the sub picture size. rent mode.
POSITION D / E or F / G
Moves the sub picture to D / E or F / G Adjusts menu settings.
direction. Selects menu item.
SSM VOL +/- (Volume Up/Down)
To select the sound appropriate to your FAVOURITE Q.VIEW Increases/decreases sound level.
viewing programme character. PR +/- (Programme Up/Down)
SIZE POSITION INDEX HOLD
Selects a programme.
NUMBER buttons
TIME REVEAL MIX MODE
? M PSM
FAVOURITE Adjusts the factory preset picture accord-
selects a favorite programme. ing to the room.
Q.VIEW
TEXT/
These buttons are used for teletext. * Returns to the previously viewed pro-
gramme.
For further details, see the `Teletext' section.
Note : In teletext mode, the PIP PR +/-,
SWAP and PIP INPUT buttons are used for VCR BUTTONS
teletext function. Controls a LG video cassette recorder.
- 4 -
Location and Function of Controls
7
TV/AV MENU OK VOL PR
8
TV/AV MENU OK VOL PR
2 1 3 4 5 6
1. Power Button 6. D / E (Programme Up/Down)
Switches the set on from standby or off to standby. Selects a programme or a menu item.
Switches the set on from standby.
2. Remote Control Sensor
F / G (Volume Up/Down)
3. TV/AV Button Adjusts the volume.
Selects the TV, AV, Component, RGB or HDMI modes. Adjusts menu settings.
Switches the set on from standby.
7. Power Indicator
4. MENU Illuminates red in standby mode, Illuminates green when the
Displays on screen menus one by one. set is turned on
Exits the current menu.
8. Intelligent Eye
Memorizes menu changes.
Adjusts picture according to the surrounding conditions.
5. OK
Accepts your selection or displays the current mode.
- 5 -
Location and Function of Controls
- Shown is a simplified representation of the set.
- Here shown may be somewhat different from your set.
- This manual explains the features available on the 42PX4RV series / RT-42PX40 series.
AV5
S-VIDEO
VIDEO
9
R AUDIO L/MONO
VIDEO AUDIO
AV1 AC INPUT
L R
HDMI/ COMPONENT AUDIO Antenna
DVI(VIDEO) AUDIO INPUT RGB INPUT
L R
VARIABLE
VARIABLE AV2
AUDIO OUT
REMOTE RS-232C INPUT
CONTROL (CONTROL/SERVICE) AV4
AV3
L R
(MONO)
S-VIDEO VIDEO
AUDIO
1 2 3 4 5 6 7 8
1. HDMI(DVI VIDEO) / AUDIO INPUT / RGB INPUT 5. VARIABLE AUDIO OUTPUT
Connect the monitor output socket of the PERSONAL COM-
PUTER, DVD or STB to this socket. 6. EURO SCART SOCKET
Note: If you want to use RGB/DVI audio, we strongly recom- Connect the euro scart socket of the VCR to these sockets.
mend that you use the cable that has a core, or the EMI Filter Note: If you want to use the EURO scart cable, you have to
core along with separate cable. use the signal shielded Euro scart cable.
2. CONTROL LOCK / REMOTE CONTROL 7. ANTENNA INPUT
3. RS-232C INPUT(CONTROL/SERVICE) PORT 8. POWER CORD SOCKET
Connect to the RS-232C port on a PC. This set operates on an AC power. The voltage is indicated on
the Specifications page. Never attempt to operate the set on
4. COMPONENT INPUT DC power.
Connect DVD video outputs to Y, PB, PR of COMPONENT
INPUT and audio outputs to Audio sockets of AUDIO INPUT. 9. AUDIO/VIDEO INPUT (AV5)
S-VIDEO/AUDIO IN SOCKETS
AUDIO/VIDEO IN SOCKETS (AV4)
Connect the audio/video 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 AV4.
- 6 -
Displayable Monitor Specification
RGB / HDMI mode
Horizontal Vertical
Resolution Frequency(KHz) Frequency(Hz)
31.468 70.09
640x350
37.861 85.08
31.469 70.08
720x400
37.927 85.03
31.469 59.94
35.000 66.66
640x480 37.861 72.80
37.500 75.00
43.269 85.00
31.500 60.00
848x480 37.799 70.00
39.375 75.00
31.500 60.00
852x480 37.799 70.00
39.375 75.00
35.156 56.25
37.879 60.31
800x600 48.077 72.18
46.875 75.00
53.674 85.06
832x624 49.725 74.55
48.363 60.00
56.476 70.06
1024x768
60.023 75.02
68.677 85.00
54.348 60.05
1152x864 63.995 70.01
67.500 75.00
1152x870 68.681 75.06
1280x960 60.023 60.02
1280x1024 63.981 60.02
- 7 -
Accessories
TV/AV MULTIMEDIA
POWER
DVD
TV VCR
MODE
CABLE
STB
AUDIO
ZOOM - ZOOM +
MUTE
PIP
SLEEP LIST
TEXT/ * I/II
ARC
EXIT
MENU
OK
PIP
PR INPUT
- PIP
PIP PR + SWAP
VOL SSM PSM PR
FAVOURITE Q.VIEW
SIZE POSITION INDEX HOLD
TIME REVEAL MIX MODE
? M
LG TV
AS mark
Owner's Manual Remote Control handset 2-Eye Bolts
1.5V
1.5V
Alkaline batteries Power Cord 2-Wall brackets
Joinning the set assembly to the wall to protect the set tumbling
- Secure the set assembly by joinning it to a wall by using the Eye Bolts/Wall brackets.
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