LG MT-42PM10, MT-42PM10B, MT-42PM10HB, MT-42PM11, MT-42PM11R Service Manual

PLASMA MONITOR

SERVICE MANUAL

CAUTION

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

CHASSIS : RF-04GA

MODEL : MT-42PM10/B/HB

MODEL : MT-42PM11/R

website:http://biz.LGservice.com

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

- 2 -

CONTENTS

CONTENTS .............................................................................................................2

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

ADJUSTMENT INSTRUCTIONS ............................................................................4

SPECIFICATIONS................................................................................................ 10

ADJUSTMENT INSTRUCTIONS ..........................................................................13

TROUBLE SHOOTING GUIDE.............................................................................15

BLOCK DIAGRAM................................................................................................26

EXPLODED VIEW.................................................................................................28

EXPLODED VIEW PARTS LIST ...........................................................................29

REPLACEMENT PARTS LIST..............................................................................30

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

DESCRIPTION OF CONTROLS

- 4 -

- 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.

POWERMUTE

PIP INPUT

MULTIMEDIA

EXIT ARC

MENU

VOL

OK

1 2 3

4 5 6

7

PSM

SSM

8 9

0

VOL

SPLIT ZOOM

PIP/DW

SLEEP

SCAN-

SKIP-

WIN. SIZE

SCAN+

PLAY

POSITION

SKIP+

STOP

SWAP

POWER

PAUSE

INPUT SELECT

MULTIMEDIA

Selects the Component, RGB or DVI

modes.

WIN.SIZE

Adjusts the sub picture size.

POWER

switches the set on from standby or
off to standby.

ARC

Changes the picture format.

MENU

Displays on screen menus one by
one.
Exits the current menu.
Memorizes menu changes.

SSM

To select the sound appropriate to
your viewing programme character.

NUMBER buttons

SLEEP

Sets the sleep timer.

PIP/DW

Switches the sub picture on or off.
Selects PIP or DW modes.

DVD BUTTONS

controls a LG DVD player.

SWAP

Alternates between main and sub pic­ture.

INPUT SELECT

EXIT

Clears all on-screen displays.

PIP INPUT

Selects the input mode for the sub pic-

ture.

MUTE

Switches the sound on or off.

DD/ EE

Selects a menu option.

FF/ GG

(Volume Up/Down)

Increases/decreases sound level.

Adjusts menu settings.

OK

accepts your selection or displays the

current mode.

PSM

Adjusts the factory preset picture

according to the room.

SPLIT ZOOM

Enlarge the screen with regular

ration.

POSITION

Moves the sub picture to

DD/ EE

or FF/

GG

direction.

- 5 -

<Front Panel Controls>

MT/MZ-42/50PM10 series

MT/MZ-42/50PM20 series

ON/OFF

VOL

MENU

INPUT SELECT

ON/OFF

- Shown is a simplified representation of the set.

- Here shown may be somewhat different from your set.

1. Main Power Button

2. Remote Control Sensor

3. Power Standby Indicator

Illuminates red in standby mode, Illuminates green when the
set is turned on

4. INPUT SELECT Button

5. MENU

Displays on screen menus one by one.
Exits the current menu.
Memorizes menu changes.

6.

DD/ EE

Selects a menu option.

FF/ GG

(Volume Up/Down)

Increases/decreases sound level.
Adjusts menu settings.

1 2 3 4 5 6

1

4

5

6

2

3

- 6 -

<Back Panel>

R

L

R

L

AC INPUT

AUDIO INPUT

AUDIO INPUT

AUDIO INPUT

VIDEO INPUT

AUDIO INPUT

S-VIDEO

RGB OUTPUTRGB INPUTDVI INPUT

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE

CONTROL

YPBP

R

AUDIO (MONO)

COMPONENT INPUT

R

L

EXTERNAL SPEAKER

Connection to PC

Connection to AV equipment

- 7 -

<Back Panel>

AV1AV1

AC INPUT

AUDIO INPUT RGB OUTPUTRGB INPUTDVI INPUT

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE

CONTROL

R

L

EXTERNAL SPEAKER

RCA Type

Scart Type

5

R

R

L

L

R

L

EXTERNAL SPEAKER

AC INPUT

AUDIO INPUT

AUDIO INPUT

AUDIO INPUT

VIDEO INPUT

AUDIO INPUT

S-VIDEO

RGB OUTPUTRGB INPUTDVI INPUT

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE

CONTROL

Y PBP

R

AUDIO (MONO)

COMPONENT INPUT

1 2 3 645

1. CONTROL LOCK / REMOTE CONTROL

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

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

3. DVI INPUT / AUDIO INPUT / RGB INPUT SOCKETS

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

RGB OUTPUT SOCKET

You can watch the RGB signal on another monitor, connect
RGB OUTPUT to another monitorÕs PC input port.

4. EXTERNAL SPEAKER OUTPUT (8 ohm)

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

manual.

5. AUDIO / COMPONENT INPUT / S-VIDEO / VIDEO INPUT /
AUDIO INPUT SOCKETS

EURO SCART SOCKET

Note: The interface board (AP-42PM10/11) is not equipped
on MT/MZ-42PM10/12X/20 series / MT/MZ-50PM10/20
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.

- 8 -

70.09

85.08

70.08

85.03

59.94

66.66

72.80

75.00

85.00

60.00

70.00

75.00

60.00

70.00

75.00

56.25

60.31

72.18

75.00

85.06

74.55

60.00

70.06

75.02

85.00

60.05

70.01

75.00

85.00

75.06

60.02

60.02

1280x1024

Displayable Monitor Specification

Displayable Monitor Specification

RGB / DVI mode

Resolution

640x350

720x400

640x480

848x480

800x600

Horizontal

Frequency(KHz)

Vertical

Frequency(Hz)

852x480

832x624

1024x768

1152x864

(RGB)

1152x870 (RGB)

1280x960 (RGB)

1280x1024 (RGB)

31.468

37.861

31.469

37.927

31.469

35.000

37.861

37.500

43.269

31.500

37.799

39.375

31.500

37.799

39.375

35.156

37.879

48.077

46.875

53.674

49.725

48.363

56.476

60.023

68.677

54.348

63.995

67.500

77.487

68.681

60.023

63.981

RGB / DVI mode

MT/MZ-42PM10/12X/20 series

MT/MZ-50PM10/20 series

Resolution

640x350

720x400

640x480

848x480

800x600

Horizontal

Frequency(KHz)

Vertical

Frequency(Hz)

852x480

832x624

1024x768

1360x768

1366x768

1152x864

1152x870

1280x960

1280x768

70.09

85.08

70.08

85.03

59.94

66.66

72.80

75.00

85.00

60.00

70.00

75.00

60.00

70.00

75.00

56.25 (RGB)

60.31

72.18

75.00

85.06

74.55

60.00

70.06

75.02

85.00

60.00

75.02

85.00

60.00

75.02

85.00

60.05

70.01

75.00

85.00

75.06

60.00

75.00

85.00

60.02

60.02

31.468

37.861

31.469

37.927

31.469

35.000

37.861

37.500

43.269

31.500

37.799

39.375

31.500

37.799

39.375

35.156

37.879

48.077

46.875

53.674

49.725

48.363

56.476

60.023

68.677

47.700

59.625

68.500

47.700

59.625

69.500

54.348

63.995

67.500

77.487

68.681

47.693

60.091

68.504

60.023

63.981

- 9 -

AS mark

LG TV

OwnerÕs Manual

1.5V

1.5V

Alkaline batteries

Power Cord

POWERMUTE

PIP INPUT

MULTIMEDIA

EXIT ARC

MENU

VOL

OK

1 2 3

4 5 6

7

PSM

SSM

8 9

0

VOL

SPLIT ZOOM

PIP/DW

SLEEP

SCAN-

SKIP-

WIN. SIZE

SCAN+

PLAY

POSITION

SKIP+

STOP

SWAP

POWER

PAUSE

INPUT SELECT

Remote Control handset

- Optional extras can be changed or modified for quality improvement without any notification new optional extras can be
added.

- Contract your dealer for buying these items.

Optional Extras

Accessories

Accessories

Tilt wall mounting bracket

404250 40 42 50

Video cables Audio cables

Ceiling mounting bracket

40

42

50

42

40

Desktop stand

Speakers

- 10 -

SPECIFICATIONS

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

.

V Application Range

This spec is sheet is applide to the 42Ó,50Ó PDP TV used RF-04GA chassis.

V Specification

Each part is tested as below without special appointment.

1) Temperature : 25

¡ 5¡C (77¡ 9¡F)

2) Relative Humidity: 65¡ 10%

3) Power Voltage: Standard Input voltage (100V -240V~, 50/60Hz)
* Standard Voltage of each product is marked by models.

4) Specification and performance of each parts are followed each drawing and specification by part number in
accordance with BOM.

5)

The receiver must be operated for about 20 minutes prior to the adjustment

.

V Test and Inspection Method

1) Performance : LGE TV test method followed.

2) Demanded other specification

Safety: CE, IEC specification
EMC : CE, IEC

Remark

Safety : IEC60065

EMI : EN55022

EMS : EN55024

Safety : IEC60065,IE60950

EMI : EN55022

Model Name

MZ-42PM10

MZ-42PM12X

MZ-50PM10

MZ-50PM20

MT-42PM10

MT-42PM20

MT-42PM12X

MT-50PM10

MT-50PM20

Market

EU

Non-EU

Market Place

EU

Non-EU

Chassis

RF-04GA

Model Name

MZ-42PM10

MZ-42PM12X

MZ-50PM10

MZ-50PM20

MT-42PM10

MT-42PM20

MT-42PM12X

MT-50PM10

MT-50PM20

Brand

LG

LG

- 11 -

V General Specification

1. General Specification (42Ó VGA MODULE)

2. General Specification (42Ó XGA MODULE)

3. General Specification (50Ó XGA MODULE)

Remark

PDP

LGE

Maker : NBK / Mitsui / LG Chemical

LGE SPEC

Maker : SONY / Murata / Sanken

Specification

42 inch wide Color Display Module

16:9

PDP42V6000

45% Total light transmittance (E- Mesh)

1) Temp : 0~40 deg

2) Humidity : 0~85%

1) Temp : -20~60 deg

2) Humidity : 0~85%

100-240V~, 50/60Hz

No

1

2

3

4

5

6

7

Item

Display Screen Device

Aspect Ratio

PDP Module

Screen Filter

Operating Environment

Storage Environment

Input Voltage

Remark

PDP

Maker : NBK / Mitsui / LG Chemical

LGE SPEC

Maker : SONY / Sanken

Specification

42 inch wide Color Display Module

16:9

PDP42X1A###, RGB Closed Type

45% Total light transmittance (E- Mesh)

1) Temp : 0~40 deg

2) Humidity : 0~85%

1) Temp : -20~60 deg

2) Humidity : 0~85%

AC100 ~ 240V, 50/60Hz

No

8

9

10

11

12

13

14

Item

Display Screen Device

Aspect Ratio

PDP Module

Screen Filter

Operating Environment

Storage Environment

Input Voltage

Remark

PDP

LGE

Maker : NBK / Mitsui / LG Chemical

LGE SPEC

Maker : SONY / Sanken

Specification

50 inch wide Color Display Module

16:9

PDP50X2###, RGB Closed Type

45% Total light transmittance (E- Mesh)

1) Temp : 0~40 deg

2) Humidity : 0~85%

1) Temp : -20~60 deg

2) Humidity : 0~85%

100-240V~, 50/60Hz

No

15

16

17

18

19

20

21

Item

Display Screen Device

Aspect Ratio

PDP Module

Screen Filter

Operating Environment

Storage Environment

Input Voltage

V Model Specification

1. MZ-42PM10 / 42PM12X / 50PM10 / 50PM20

2. MT-42PM10 / 42PM20 / 42PM12X / 50PM10 / 50PM20

- 12 -

Remark

4 System : PAL, B/G/I/D/K, SECAM L/,

NTSC4.43, PAL60

4 System : PAL, B/G/I/D/K, SECAM L/,

NTSC4.43, PAL60

Up to UXGA@60Hz/480P

Up to UXGA@60Hz/480P

DVI-D

L/R Input

Specification

EU

PAL, SECAM

PAL, SECAM, NTSC

Y/ Cb/ Cr, Y/ Pb/ Pr

RGB-PC/DTV

RGB-PC/DTV

DVI-PC/DTV

PC Audio, Component,S-VHS, CVBS

Discrete IR

No

22

23

24

25

26

27

28

29

30

Item

Market

Scart Jack (2EA )

S-AV Input (1EA )

Component Input (1EA )

RGB Input (1EA )

RGB Outpu t (1EA )

DVI Input (1EA )

Audio Input (4EA )

Wired Control

Remark

4 System : PAL, B/G/I/D/K, SECAM L/,

NTSC4.43, PAL60

4 System : PAL, B/G/I/D/K, SECAM L/,

NTSC4.43, PAL60

Up to UXGA@60Hz/480P

Up to UXGA@60Hz/480P

DVI-D

L/R Input

Specification

Non-EU

PAL, SECAM, NTSC

PAL, SECAM, NTSC

Y/ Cb/ Cr, Y/ Pb/ Pr

RGB-PC/DTV

RGB-PC/DTV

DVI-PC/DTV

PC Audio, Component,S-VHS, CVBS

Discrete IR

No

31

32

33

34

35

36

37

38

39

Item

Market

Scart Jack (2EA )

S-AV Input (1EA )

Component Input (1EA )

RGB Input (1EA )

RGB Outpu t (1EA )

DVI Input (1EA )

Audio Input (4EA )

Wired Control

- 13 -

ADJUSTMENT INSTRUCTIONS

1. Application Object

This spec sjeet os applied all of the 42Ó, 50Ó, RF-04GA
chassis bymanufacturing LG TV Plant or sort plant.

2. Specification

(1) Because this is not a hot chassis, it is not necessary to

use an isolation transformer. However, the use of isolation

transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of

25±5¡C of temperature and 65±10% of relative humidity if

there is no specific designation.
(4) The input voltage of the receiver must keep 100-220V~,

50/60Hz.
(5) The receiver must be operated for about 15 minutes prior

to the adjustment.

O After RGB Full white HEAT-RUN Mode, the receiver must

be operated prior to adjustment.

O Enter into HEAT-RUN MODE

1) Press the POWER ON KEY on R/C for adjustment.

2) OSD display and screen display 100% full WHITE
PATTERN.

[ Set is activated HEAT-RUN without signal generator in

this mode.

[ Single color pattern(RED/BLUE/GREEN) of HEAT-RUN

mode uses to check pannel.

Caution) If you turn on a still screen more than 20 minutes

(Especially digital pattern, cross hatch pattern), a after
image may be occur in the black level part of the
screen.

3. POWER PCB Assy Voltage
Adjustments

(Va, Vs Voltage Adjustments)

3-1. Test Equipment : D.M.M. 1EA

3-2. Connection Diagram for Measuring

Refer to [Fig 1]

3-3. Adjustment Method for

(1) Va Adjustment

1) After receiving 100% Full White Pattern, HEAT RUN.

2) Connect + terminal of D.M.M to Va pin of P805, connect

- terminal to GND pin of P805.

3) After turningVR351, voltage of D.M.M adjustment as
same as Va voltage which on lable of panel right/top
(Deviation; ±0.5V)

(2) Vs Adjustment

1) Connect + terminal of D.M.M to Vs pin of P805, connect
Ð terminal to GND pin of P805.

2) After turning RV551, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)

4. Auto RGB Color balance

4-1 Pattern Equipment :

PC Pattern Generator( 801F or VG828 )

(16Gray Scale Pattern output(RGB output Level: 0.7Vp-p))

4-2 Method of Auto RGB Color Balance

(1) Input RGB Source: 16Gray Scale Pattern output

(RGB output Level: 0.7Vp-p)
(2) Press ADJ KEY on R/C for adjustment.
(3) Press Vol. +KEY and Operate To Set.
(4) Auto-RGB OK means completed adjustment.

P805

P804

P806

P803

P802

P801

VR351

GND

GND

Va

Va

Vs

Vs

Vs

Vs ADJ

VR551

VR5

Vs ADJ

[Fig. 1] Connection Diagram of Power Adjustment for Measuring

[Fig. 2] Auto RGB Color Balance Test Pattern