lg_42pc1rr_chassis_mf056l_sm1.pdf

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PLASMA TV

SERVICE MANUAL

CHASSIS : MF-056L

MODEL : 42PC1RR

42PC1RR-ZL

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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 ..............................................................................

- 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.

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.

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.

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.

If any fuse (or Fusible Resistor) in this monitor is blown, replace it

with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor,

over 1W), keep the resistor 10mm away from PCB.

Leakage Current Hot Check circuit

Keep wires away from high voltage or high temperature parts.

AC Volt-meter

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.

Good Earth Ground

such as WATER PIPE,

CONDUIT etc.

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

To Instrument's

exposed

METALLIC PARTS

0.15uF

1.5 Kohm/10W

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.

and 5.2M

- 3 -

DESCRIPTION OF CONTROLS

POWER

INPUT

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.

Selects the Component, RGB or HDMI/DVI modes.

switches the set on from standby.

MULTIMEDIA

INPUT

POWER

DVD

MODE

MULTIMEDIA

CABLE

Selects another device.

MODE

Controls a video cassette recorder.

These buttons are used for X Studio.

For further details, see the ‘X Studio’ section.

VCR BUT-

TONS

MARK

Selects the wanted functions.

In AV1, AV2, S-Video2, AV3, AV4, Component, RGB,

HDMI/DVI input sources, screen returns to the last

TV programme.

TIME

SHIFT

TIME

SHIFT

LIVE TV

Brings up the HOME menu.

Displays on screen menus one by one.

Exits the current menu.

Memorizes menu changes.

VOL

MUTE

TEXT

Clears all on-screen displays and returns to TV

viewing from any menu.

EXIT

Increases/decreases sound level.

VOL D / E

(Volume

Up/Down)

PR D / E

(Programme

Up/Down)

Select a programme.

Switchs the set on from standby.

LIST

Q.VIEW

SIZE

POSITION

INDEX

TIME

MUTE

Switches the sound on or off.

REVEAL

HOLD

SLEEP

FAV

TEXT

PIP

ARC

I/II

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.

ARC

Changes the picture format.

I/II

Selects the language during dual language broad-

cast.

Selects the sound output.

- 4 -

accepts your selection or displays the

current mode.

D / E or F / G

(TIME SHIFT)

Adjusts menu settings.

Selects menu item.

TIME

SHIFT

TIME

SHIFT

PIP

Switches the sub picture on or off.

Selects PIP , POP or DW modes.

PIP PR +/-

Selects a programme for the sub picture.

SWAP

Alternates between main and sub picture.

VOL

MUTE

TEXT

PIP INPUT

Selects the input mode for the sub picture.

Adjusts the sub picture size.

SIZE

POSITION

Moves the sub picture to D / E or F / G direction.

NUMBER buttons

Displays the programme table.

LIST

Q.VIEW

Returns to the previously viewed programme.

TIME

SIZE

POSITION

INDEX

Sets the sleep timer.

SLEEP

REVEAL

HOLD

SLEEP

FAV

PIP

ARC

I/II

Selects a favourite programme.

FAV

Remote control effective range

Installing Batteries

Open the battery compart-

ment cover on the back

side.

Insert two batteries in cor-

rect polarity (+ with +, -

with -). Don’t mix old or

used batteries with new

ones.

INPUT

MULTIMEDIA

POWER

CABLE

DVD

INPUT

MULTIMEDIA

MODE

POWER

CABLE

MODE

TIME

SHIFT

TIME

SHIFT

TIME

SHIFT

TIME

SHIFT

VOL

MUTE

TEXT

VOL

MUTE

TEXT

n Use a remote control 7 meter distance and 30

degree ( left/right ) within the receiving unit

scope.

n Dispose of used batteries in a recyclebin to

preserve environment.

Close the cover.

- 5 -

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