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PLASMA TV
SERVICE MANUAL
CHASSIS : MF-056B
MODEL : 50PX4R
50PX4R-ZB
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS
SAFETY PRECAUTIONS ....................................................................................3
DESCRIPTION OF CONTROLS ..........................................................................4
SPECIFICATIONS ................................................................................................9
ADJUSTMENT INSTRUCTIONS .......................................................................11
TROUBLE SHOOTING GUIDE ..........................................................................16
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
INPUT POWER
Selects the TV, AV1, AV2, S-Video, AV3, AV4, switches the set on from standby or off to
AV5, Component, RGB or HDMI modes. standby.
switches the set on from standby.
MULTIMEDIA
MODE
INPUT MULTIMEDIA
Selects the Component, RGB or HDMI
POWER modes.
Selects another device.
switches the set on from standby.
DVD
VCR BUTTONS TV VCR
Controls a video cassette recorder.
MODE
MARK
CABLE
These buttons are used for X-Studio. AUDIO STB Selects the wanted functions.
For further details, see the `X-Studio' section.
INFO Brings up the menu to select the Photo or
Displays information on top of the screen INFO i MARK Music mode of Xstudio for memory cards.
whilst watching the TV.
U EXIT
MENU MEN EXIT
Displays on screen menus one by one. Clears all on-screen displays and returns
Exits the current menu. to TV viewing from any menu.
Memorizes menu changes.
OK
PIP
OK Switches the sub picture on or off.
accepts your selection or displays the Selects PIP, POP or DW modes.
current mode. PIP PR + /-
Selects a programme for the sub picture.
D / E or F / G PIP P
R-
PIP PR + PIP IN
PUT
SWAP
SWAP
Adjusts menu settings. Alternates between main and sub picture.
Selects menu item. PIP INPUT
VOL MUTE FAV PR Selects the input mode for the sub picture.
VOL D / E (Volume Up/Down) SIZE
Increases/decreases sound level. Adjusts the sub picture size.
PR D / E (Programme Up/Down) POSITION
Selects a programme. Moves the sub picture to D / E or F / G
direction.
MUTE
Switches the sound on or off. FAV
selects a favourite programme.
NUMBER buttons
LIST Q.VIEW
LIST Q.VIEW
Displays the programme table. SIZE POSITION INDEX HOLD Returns to the previously viewed
programme.
TIME REVEAL MIX MODE
PSM ? M
Adjusts the factory preset picture according PSM SSM ARC TEXT
TEXT
to the room. These buttons are used for teletext.
SLEEP I/II PIP M/C EJECT
For further details, see the `Teletext' section.
Note : In teletext mode, the PIP PR +/-,
SSM SWAP and PIP INPUT buttons are used
To select the sound appropriate to your for teletext function.
viewing programme.
SLEEP M/C EJECT
Sets the sleep timer. Remove the Memory Card.
I/II ARC
Selects the language during dual language Changes the picture format.
broadcast.
Selects the sound output.
-4-
10
7
8
9
INPUT MENU OK VOL PR
1 2 3 4 5 6
1. Remote Control Sensor 7. INDEX
Switches FRONT Display on or off.
2. Power Button
Switches the set on from standby or off to standby. 8. Power Indicator
Illuminates red in standby mode, illuminates green when
3. INPUT Button the set is turned on.
Selects the TV, AV, Component, RGB or HDMI modes.
Switches the set on from standby. 9. Intelligent Eye
Adjusts picture according to the surrounding conditions.
4. MENU
Displays on screen menus one by one. 10. Memory Card Slots 1, 2
Exits the current menu.
Memorizes menu changes.
5. OK
Accepts your selection or displays the current mode.
6. D / E (Programme Up/Down)
Selects a programme or a menu item.
Switches the set on from standby.
F / G (Volume Up/Down)
Adjusts the volume.
Adjusts menu settings.
-5-
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
COMPUTER, DVD or STB to this socket. 6. EURO SCART SOCKET
Note: If you want to use RGB/DVI audio, we strongly Connect the euro scart socket of the VCR to these sockets.
recommend that you use the cable that has a core, or the Note:
EMI Filter core along with separate cable. a. If you want to use the EURO scart cable, you have to use
the signal shielded Euro scart cable.
2. REMOTE CONTROL b. If the S-VIDEO(Y/C) signal is received through the Euro
scart socket 2 (AV 2), you must change to the S-Video 2
3. RS-232C INPUT(CONTROL/SERVICE) PORT (Y/C) mode.
Connect to the RS-232C port on a PC.
7. ANTENNA INPUT
4. COMPONENT INPUT
Connect DVD video outputs to Y, PB, PR of COMPONENT 8. POWER CORD SOCKET
INPUT and audio outputs to Audio sockets of AUDIO INPUT. This Monitor operates on AC power. The voltage is indicated
on the Specifications page. Never attempt to operate the set
AUDIO/VIDEO IN SOCKETS (AV4) on DC power.
Connect the audio/video out sockets of external equipment
to these sockets.
S-VIDEO/AUDIO IN SOCKETS 9. AUDIO/VIDEO INPUT (AV5)
Connect the S-VIDEO out socket of an VCR to the S-VIDEO S-VIDEO/AUDIO IN SOCKETS
socket.
Connect the audio out sockets of the VCR to the audio sockets
as in AV4.
-6-
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
Joining the set assembly to the wall to prevent the set tumbling
- Secure the set assembly by joining it to a wall by using the Eye Bolts/Wall brackets.