LG MT-42PZ40/V, MT-42PZ40/B, MT-42PZ40/R, MT-42PZ41/B, MT-42PZ40/S Service Manual

PLASMA MONITOR
SERVICE MANUAL

CAUTION

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

CHASSIS : RF-02RA

MODEL : MT-42PZ40/V/B/R/S

MODEL : MT-42PZ41/V/B/R/S/VB
MODEL : MT/MZ-42PZ42/V/B/R/S
MODEL : MT/MZ-42PZ43/V/B/R/S/VS

website:http://biz.LGservice.com

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

Jan., 2003

Printed in KoreaP/NO : 3828VD0129E

- 2 -

CONTENTS

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

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

SPECIFICATIONS .............................................................................................. 7

ADJUSTMENT INSTRUCTIONS ......................................................................10

BLOCK DIAGRAM.............................................................................................13

ASSEMBLY METHOD........................................................................................14

EXPLODED VIEW..............................................................................................16

EXPLODED VIEW PARTS LIST ........................................................................17

REPLACEMENT PARTS LIST...........................................................................18

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

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

- 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.

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.

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.

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.

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 1MΩ 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.

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.

Leakage Current Hot Check circuit

1.5 Kohm/10W

To Instrument's
exposed 
METALLIC PARTS

Good Earth Ground
such as WATER PIPE,
CONDUIT etc.

AC Volt-meter

IMPORTANT SAFETY NOTICE

0.15uF

- 4 -

DESCRIPTION OF CONTROLS

<Back Panel>

<Front Panel Controls>

Connection to PC

Note: All cables shown are not provided with the Monitor, except:

A D-sub 15 pin cable and DVI cable is supplied to connect the Monitor to a PC.

Connection to AV equipment

( )( )

R

( )( )

L

REMOTE
CONTROL

RGB2 INPUT

(DIGITAL RGB INPUT)

RS-232C INPUT

(CONTROL/SERVICE)

EXTERNAL SPEAKER

LOCK

CONTROL

ON/ OFF

YPBP

R

(MONO)

R

AUDIO

L

R

AUDIO

L

S-VIDEO

VIDEO INPUT

AC INPUTAUDIO INPUTAUDIO INPUT

COMPONENT(480i/480p)

(DVD INPUT)

RGB1 INPUT

(PC INPUT)

RGB1 OUTPUT

(PC OUTPUT)

AUDIO INPUT

VOL.MENU

INPUT 

SELECT

ON/OFF



Main Power Button

INPUT SELECT Button

VOLUME (F,G) Buttons

Power Standby Indicator

Illuminates red in standby mode,

Illuminates green when the

Monitor is turned on

Remote Control Sensor

MENU Button

D,E

Buttons

AUDIO

INPUT

VIDEO INPUT

S-VIDEO
INPUT

COMPONENT
AUDIO INPUT

RS-232C
INPUT

RGB2 INPUT
(DIGITAL
RGB INPUT)

RGB1
INPUT
(PC
INPUT)

RGB AUDIO
INPUT

COMPO­NENT(480i/480p)
(DVD INPUT)

- 5 -

( )( )

R

( )( )

L

REMOTE
CONTROL

RGB2 INPUT

(DIGITAL RGB INPUT)

RS-232C INPUT

(CONTROL/SERVICE)

EXTERNAL SPEAKER

LOCK

CONTROL

ON/ OFF

AC INPUT

RGB1 INPUT

(PC INPUT)

RGB1 OUTPUT

(PC OUTPUT)

AUDIO INPUT

AV1AV1

<Back Panel>

RCA Type

Scart Type

5

( )( )

R

( )( )

L

REMOTE
CONTROL

RGB2 INPUT

(DIGITAL RGB INPUT)

RS-232C INPUT

(CONTROL/SERVICE)

EXTERNAL SPEAKER

LOCK

CONTROL

ON/ OFF

Y PBP

R

(MONO)

R

AUDIO

L

R

AUDIO

L

S-VIDEO

VIDEO INPUT

AC INPUTAUDIO INPUTAUDIO INPUT

COMPONENT(480i/480p)

(DVD INPUT)

RGB1 INPUT

(PC INPUT)

RGB1 OUTPUT

(PC OUTPUT)

AUDIO INPUT

1 2 3 64 5

1. EXTERNAL SPEAKER (8 ohm output)

Connect to optional external speaker(s).
*For further information, refer to ÔSpeaker & Speaker StandÕ

manual.

2. RS-232C INPUT(CONTROL/SERVICE) PORT

Connect to the RS-232C port on a PC.

3. RGB2 INPUT(DIGITAL RGB INPUT)/RGB1 INPUT(PC
INPUT)/AUDIO INPUT SOCKET

Connect the monitor output socket of the PERSONAL COM­PUTER to this socket.

RGB1 OUTPUT(PC OUTPUT) SOCKET

You can watch the RGB1 signal on another monitor, connect
RGB1 OUTPUT (PC OUTPUT) to another monitorÕs PC
input port. When the monitor is in standby mode, you can not
watch the RGB1 signal on another monitor.

4. CONTROL LOCK Switch
REMOTE CONTROL

When ÒCONTROL LOCKÓ is set ÒONÓ, Monitor is operated by
the external control device.

5. AUDIO / COMPONENT(480i/480p)(DVD INPUT) / S-VIDEO
/ VIDEO INPUT / AUDIO INPUT SOCKETS

EURO SCART SOCKET

Note : The interface board(AP-42EA40/41) is not equipped
on MT/MZ-42PZ42/43 series models. Contact your dealer
for buying this optional item.

6. POWER CORD SOCKET

This Monitor operates on an AC power. The voltage is indi­cated on the Specifications page. Never attempt to operate
the Monitor on DC power.

- 6 -

- When using the remote control aim it at the remote control sensor of the Monitor.

- There's maybe a defect in consecutive operation of remote control in specified brightness according to this monitor
feature.

¥ Open the battery compartment cover on the back side and

insert the batteries with correct polarity.

¥ Install two 1.5V alkaline batteries of AAA type. DonÕt mix used

batteries with new batteries.

Installing Batteries

1 2 3

4 5 6

7 8

0

9

POWER

SLEEP INPUT SELECT

PSM SSM

ARC

AUTO CONFIG.

ZOOM -

ZOOM +

SPLIT ZOOM

MENU MUTE

OK

VOL

POWER STOP

PLAY FF

REC

REW

P/STILL

PIP

TWIN PICTURE

PIP POSITION

PIP STILL

SOUND SELECT

PIP INPUT

VOL

CHILD LOCK

POWER

Switches the Monitor on from stand-

by or off to standby.

SLEEP

Sets the sleep timer.

PSM

Adjusts the factory preset picture

according to the room.

ARC

Changes the picture format.

ZOOM-

Reduces the main picture size.

SPLIT ZOOM

Enlarge the screen with regular

MENU

Displays on screen menus one by one.

Exits the current menu.

Memorizes menu changes.

NUMBER buttons

PIP

Switches the sub picture on

TWIN PICTURE

PIP INPUT

Selects the input mode for the

sub picture.

SOUND SELECT

Select main picture sound or

sub picture sound for PIP.

PIP POSITION

change the sub picture position.

PIP STILL

Freeze sub picture motion.

VCR BUTTONS

Controls a LG video cassette
recorder.

OK

DD/ EE

Selects a menu option.

FF/ GG

(Volume button)

Increases/decreases sound level.
Adjusts menu settings.

INPUT SELECT

SSM

To select the sound appropriate to
your viewing program character:

Flat, Speech, Movie, Music, or
User

AUTO CONFIG.

CHILD LOCK

To operate the monitor with remote
control only.

MUTE

Switches the sound on or off.

ZOOM+

Enlarges the main picture size.

- 7 -

SPECIFICATIONS

NOTE : Specifications and others are subject to change without notice for improvement

.

F Scope

This specification can be applied to all model of 42ÓPDP
MONITOR related to RF-02RA Chassis.

F Test Condition

1) Temperature : 20¡ 5¡C

2) Relative Humidity: 65¡ 10%

3) Power Voltage:Standard Input Voltage
(AC 100V-260V,~50/60Hz)
Rated Voltage(AC 100V-260V,~50/60Hz)
But Standard input voltage mark value is marked by model.

4) Follow each drawing or spec for spec and performance of
parts,based upon P/N of B.O.M

5)

Warm up set for more than 15min before the

measurement.

F Test and Inspection Method

1) Performance:Follow the Standard of LG TV test

2) Standards of Etc requirement
Safety: Follow the standard of UL1950,CSA1950
EMC: FCC PART 15 CLASS A/B(40: ClassB; 41,43: ClassA)

Appliance

OK

TEST,Not Applied

OK

Remark

Safety: IEC950,EN60590

EMC:

Safety: EN60590

EMC: CE

Model Name

MT-42PZ40/41

/42/43

MZ-42PZ42/43

Market

N-EU,China

EU

Chassis

RF-02RA

Brand

LG

LG

Model Name

MT-42PZ40/41/42/43

MZ-42PZ42/43

Market Place

N-EU, China

EU

Remark

Industry/Home use

Industry/Home use

- 8 -

F Feature and Function

No

Item

Specification

Remark

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Remote controller Code

External Control

RGB1 Input

RGB2 Input

RGB Audio input

RGB1 Output

Component input

Component Audio input

AV Input

S-video input

External Speaker Output

Auto Picture mode

User control

DASP

AVL

PIP(Picture In Picture)Mode

DW Mode

NEC Code

RS-232C

RGB-DTV,RGB-PC(Analog)

RGB-DTV(DVI),RGB-PC(Digital)

L/R

RGB-DTV,RGB-PC Throughout

Y,C

B/PB,CR/PR

L/R

Video/L/R

Y/C

L/R

Clear/ Soft/ User

Contrast/ Brightness/ Color/ Tint/

Sharpness/ Color Temperature

Flat/ Sports/ Cinema/ Music/ User

On/ Off

O

D-Sub 9 pin

D-Sub 15 pin

Earphone Jack

D-Sub 15pin

Video:BNC Jack,SCART1/2(MZ-42PZ43)

Spk terminal

Tint: Only NTSC-M

1)Main screen:RGB_PC/DVI

2)Sub screen: COMPONENT/AV/

S-VIDEO(480i),RGB-DTV(480P,720P,1080I)

Feature

Picture

Sound

1

1

1

1

1

1

1

1

1

2

F General Specification

No

Item

Specification

Remark

Video input

applicable system

Input Voltage

Screen Size

Aspect Ratio

PDP Module

Screen Filter

Operating Environment

Storage Environment

1

2

3

4

5

6

7

8

NTSC-M/PAL/SECAM/NTSC4.43(MT,MZ)

MT-42PZ40/41/42/43: 110V -240V 50Hz

MZ-42PZ42/43: 200V -240V 50Hz

42 inch

16:9 (wide)

PDP42WVSN4

Transmissivity: 45%

1)Temp: 0 ~ 40 deg

2)Humidity: 80% under

1)Temp: -20 ~ 60 deg

2)Humidity: 85% under

PDP

LGE

Maker: NBK

O

O

O

O

O

O

16:9, 4:3, Zoom

Noise Reduction(YNR)

Film Mode

Motion detection

Sleep Timer

Orbiter

White Wash

Display Mode

- 9 -

No

Item

Specification

Remark

17

18

19

20

21

22

23

AV,Component 480i

Afterimage Prevention

(left,bottom,right,top,top,right,bottom,left)

Afterimage Remove

480i/p,720p,1080i

: 16:9, 4:3, Zoom

PC(Analog/Digital)

: 4:3, 16:9

F Safety and Regulation

No

Item

Remark

1

2

Power Consumption,Max

Power Consumption,Stand by

300

Min

Typ

UnitMax

350

400

6

W

W

IEC950

F External Interface

No

Item

Remark

1

2

3

4

5

6

7

8

9

10

11

12

Video Input Level

Video Input Frequency Response

Video Input S/N

S Video Input Level(Y)

S Video Input Level(C-BURST)

Audio Input Level

Audio Input Frequency Response

Audio Input S/N

Audio Input Distortion

Audio Input Dynamic Range

Component Video Input Level

(Y,C

B/PB,CR/PR

)

R/G/B Video Input Level

0.9

5

40

0.85

0.143

0.3

0.08

40

2

0.6

0.6

Min

Typ

UnitMax

1

1

0.4

0.7

0.7

1.1

1.15

0.286

0.5

7

2

0.8

0.8

Vpp

MHz

dB

Vpp

Vpp

Vrms

kHz

dB

%

V

Vpp

Vpp

Video Valuation

Video Valuation

Video Valuation

Video Valuation

Video Valuation

NTSC/PAL

Video Valuation, 75 ohm

(480i,480p,720p,1080i)

75ohm