LG 42PC1RRH-TL (CHASSIS:MF-056L) Service Manual ▷ View online
PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : MF-056L
MODEL : 42PC1RRH
42PC1RRH-TL
- 2 -
CONTENTS
SAFETY PRECAUTIONS ....................................................................................3
DESCRIPTION OF CONTROLS ..........................................................................4
SPECIFICATIONS ..............................................................................................10
ADJUSTMENT INSTRUCTIONS .......................................................................12
TROUBLE SHOOTING GUIDE ..........................................................................19
BLOCK DIAGRAM .............................................................................................30
EXPLODED VIEW ..............................................................................................32
EXPLODED VIEW PARTS LIST ........................................................................33
REPLACEMENT PARTS LIST...........................................................................34
SCHEMATIC DIAGRAM.........................................................................................
PRINTED CIRCUIT DIAGRAM ..............................................................................
- 3 -
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.
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 isolation 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.
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 circuitry that may be
inadvertently introduced during the service operation.
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this monitor is blown, replace it
with the specified.
with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube.
Do not lift the Picture tube by it's Neck.
extreme care should be used in handling the Picture Tube.
Do not lift the Picture tube by it's Neck.
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 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 antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1M
electrical jumper across the two AC plug prongs. 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 antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1M
Ω 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.
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 exposed 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 specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
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 exposed 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 specified, 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
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF
- 4 -
DESCRIPTION OF CONTROLS
MODE
INPUT
TV
DVD
VCR
AUDIO
PIP PR
-
PIP PR +
SWAP
PIP INPUT
STB
MENU
MUTE
SIZE
POSITION
INDEX
SLEEP
FAV
I/II
PIP
ARC
Q.VIEW
LIST
TEXT
OK
VOL
PR
MULTIMEDIA
POWER
CABLE
HOLD
REVEAL
?
TIME
EXIT
MARK
LIVE TV
TIME
SHIFT
SHIFT
TIME
SHIFT
SHIFT
POWER
INPUT
MULTIMEDIA
MODE
VCR BUTTONS
MARK
LIVE TV
MENU
EXIT
VOL
D
D
/
E
E
(Volume
Up/Down)
PR
D
D
/
E
E
(Programme
Up/Down)
MUTE
TEXT
ARC
I/II
switches the set on from standby or off to standby.
Selects the TV, AV, Component, RGB or HDMI/DVI modes.
switches the set on from standby.
switches the set on from standby.
Selects the Component, RGB or HDMI/DVI modes.
switches the set on from standby.
switches the set on from standby.
Selects another device.
Controls a video cassette recorder.
These buttons are used for X Studio.
For further details, see the ‘X Studio’ section.
These buttons are used for X Studio.
For further details, see the ‘X Studio’ section.
Selects the wanted functions.
In TV, AV1, AV2, Component modes, screen returns
to the live programme.
to the live programme.
Brings up the Home menu.
Displays on screen menus one by one.
Exits the current menu.
Memorizes menu changes.
Exits the current menu.
Memorizes menu changes.
Clears all on-screen displays and returns to TV
viewing from any menu.
viewing from any menu.
Increases/decreases sound level.
Select a programme.
Switchs the set on from standby.
Switches the sound on or off.
These buttons are used for teletext.
For further details, see the ‘Teletext’ section.
Note : In teletext mode, the PIP PR +/-, SWAP and
PIP INPUT buttons are used for teletext function.
For further details, see the ‘Teletext’ section.
Note : In teletext mode, the PIP PR +/-, SWAP and
PIP INPUT buttons are used for teletext function.
Changes the picture format.
Selects the language during dual language broadcast.
Selects the sound output.
Selects the sound output.