LG MU-42PZ90C Service Manual

PLASMA MONITOR

SERVICE MANUAL

CAUTION

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

CHASSIS : RF-03GA

MODEL : MU-42PZ90V MU-42PZ90XV

MODEL : MU-42PZ90XC

CANADA : http//biz.lgservice.com USA : http//www.lgservice.com

: http//lgservice.com/techsup.html

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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 lsolation 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 circuitary 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 positioin, 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 esposed 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 sepcified, 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

CANADA: LG Electronics Canada, Inc. 550 Matheson

Boulevard East Mississauga, Ontario L4Z 4G3

USA : LG Customer Interactive Center

P.O.Box 240007, 201 James Record Road Huntsville, AL 35824 Digital TV Hotline 1-800-243-0000

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

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

SPECIFICATIONS.................................................................6

EXTERNAL CONTROL DEVICE SETUP..............................8

IR CODE(NEC FORMAT) ...................................................14

ADJUSTMENT INSTRUCTION...........................................16

BLOCK DIAGRAM...............................................................19

EXPLODED VIEW...............................................................22

EXPLODED VIEW PARTS LIST.........................................23

REPLACEMENT PARTS LIST............................................24

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

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

TABLE OF CONTENTS

- 4 -

DESCRIPTION OF CONTROLS

Controls

Connection Options

( )( )

( )

EXPANDED

INPUT

VIDEO INPUT

RS-232C INPUT

(CONTROL/SERVICE)

EXTERNAL SPEAKER

Y PBP

(MONO)

AUDIO

S-VIDEO

AC INPUT

AUDIO INPUT

REMOTE CONTROL

COMPONENT INPUT

DVI INPUT

RGB INPUT

RGB OUTPUT

1. EXTERNAL SPEAKER (8 ohm output)

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

Stand’ manual.

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

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

3. DVI (Digital Visual Interface) INPUT/ RGB INPUT/AUDIO INPUT JACKS

Connect the monitor output connector of a PC to the appropriate input port.

4. RGB OUTPUT JACKS

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

5. EXPANDED INPUT

Connect the Monitor with the PDP Tuner by using the tuner box cable.

6. COMPONENT INPUT/AUDIO INPUT JACKS

7. REMOTE CONTROL

Connect your wired remote control to the remote control port on the Monitor.

8. S-VIDEO INPUTS

Connect video out from an S-VIDEO VCR to the S-VIDEO input.

AUDIO/VIDEO INPUT JACKS

Connect audio/video out from external equipment to these jacks.

9. 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.

Back Connection Panel

VOL.MENU

INPUT

SELECT

ON/OFF

Main Power Button

INPUT SELECT Button

VOLUME (FF,GG) Buttons

Power Standby Indicator

Illuminates red in standby mode,

Illuminates green when the

Monitor is turned on

Remote Control Sensor

MENU Button

EE, DD

Buttons

Front Panel Controls

2 4 5 73 8

- 5 -

DESCRIPTION OF CONTROLS

Remote Control Key Functions

- When using the remote control, aim it at the remote control sensor on the monitor.

- Under certain conditions such as when the beam is interrupted, the remote control may not function. Press the key again if necessary.

1 2 3

4 5 6

7 8

POWER

MULTIMEDIA INPUT SELECT

APC DASP

ARC SLEEP

PIP

SWAP

MENU MUTE

ENTER

VOL

POWER

STOP

REC

PLAY

REW

P/STILL

WIN.SIZE

WIN.POSITION

FAV CH

CAPTION

A.PROG PIP CH

PIP CH

ZOOM +

MTS

ZOOM -

SPLIT ZOOM

MEMORY/ERASE

VOL

PIP INPUT

POWER

Switches the monitor between

ON and STANDBY.

MULTIMEDIA

Selects:

Component, RGB or DVI mode.

APC

Adjusts the factory preset picture

according to the room.

ARC

Changes the picture format.

PIP

Switches the sub picture on and off.

SWAP

Exchange main and sub picture

image.

Displays on screen menus.

Exits the current menu.

Memorizes menu changes.

ENTER CH

DD / EE

(Channel button)

Select menu options.

VOL

FF / GG

(Volume button)

Increases/decreases sound level. Adjusts menu settings.

INPUT SELECT

Selects:

Video, S-Video, Component,

RGB or DVI mode.

DASP

Selects the sound appropriate to your viewing program character:

Flat, Music, Movie, Sports, or User.

SLEEP

Sets the sleep timer.

PIP INPUT

Selects the input mode for the sub picture.

MUTE

Switches the sound on or off.

ZOOM-/ZOOM+

Enlarges or reduces the main picture size.

DW (Double Window)

Select the Double Window.

WIN. SIZE

Adjusts the sub picture size.

WIN.POSITION

Moves the sub picture.

NUMBER buttons

Not functional

VCR BUTTONS

Control LG video cassette recorders.

SPLIT ZOOM

Enlarge the screen with regular

ration.

- 6 -

• The specifications shown above may be changed without notice for quality improvement.

MODELS

Width (inches / mm)

Height (inches / mm)

Depth (inches / mm)

Weight (pounds / kg)

Power requirement

Resolution

Color

Operating Temperature Range

Operating Humidity Range

Maximum Elevation

MU-42PZ44V MU-42PZ90V

40.7 / 1033

24.5 / 622

3.2 / 81 75 / 34

AC100-240V ~ 50/60Hz

852 x 480 (Dot)

16,770,000 (256 steps of each R, G and B)

32 ~ 104°F (0 ~ 40°C)

Less than 80%

6561 feet (2000m)

SPECIFICATIONS

- 7 -

SPECIFICATIONS

Monitor Display Specifications

RGB/DVI Mode

Resolution

640x350

720x400

640x480

848x480

852x480

Horizontal

Frequency(KHz)

31.468

37.861

31.469

37.927

31.469

35.000

37.861

37.500

43.269

45.913

31.5 35

37.5

31.5 35

37.5

70.09

85.08

70.08

85.03

59.94

66.66

72.80

75.00

85.00

90.03

60.00

70.00

75.00

60.00

70.00

75.00

35.156

37.879

48.077

46.875

53.674

56.000

49.725

48.363

54.476

60.023

54.348

63.995

67.500

68.681

60.000

63.981

56.25

60.31

72.18

75.00

85.06

90.00

74.55

60.00

70.06

75.02

60.05

70.01

75.00

75.06

60.00

60.02

Vertical

Frequency(Hz)

Resolution

800x600

832x624

1024x768

1152x864

1152x870

1280x1024

Horizontal

Frequency(KHz)

Vertical

Frequency(Hz)

1280x960

GROUNDING

Ensure that you connect the grounding / earth wire to prevent possible electric shock. If grounding methods are not possible, have a qualified electrician install a separate circuit breaker. Do not try to ground the unit by connecting it to telephone wires, lightening rods, or gas pipes.

For proper ventilation, allow a clearance of 4” on each side and 2” from the wall. Detailed installation instructions are included from your dealer in the optional Wall Mounting Bracket Installation and Setup Guide.

- 8 -

EXTERNAL CONTROL DEVICE SETUP

No. Pin name 1 No connection 2 RXD (Receive data) 3 TXD (Transmit data) 4 DTR (DTE side ready) 5 GND 6 DSR (DCE side ready) 7 RTS (Ready to send) 8 CTS (Clear to send) 9 No Connection

1 5

2 3 5 4 6 7 8

RXD

TXD

GND

DTR

DSR

RTS CTS

TXD RXD GND DSR

DTR

CTS

RTS

7-Wire Configurations

(Standard RS-232C cable)

D-Sub 9

3 2 5 6 4 8 7

PDP

D-Sub 9

2 3 5 4 6 7 8

RXD TXD

GND

DTR

DSR

RTS CTS

TXD RXD

GND

DTR

DSR

RTS CTS

3-Wire Configurations

(Not standard)

D-Sub 9

3 2 5 4 6 7 8

PDP

D-Sub 9

- Connect the RS-232C input jack to an external control device (such as a computer or an A/V control system) and control the Monitor’s functions externally.

- Connect the serial port of the control device to the RS-232C jack on the Monitor back panel.

- RS-232C connection cables are not supplied with the Monitor.

TType of Connector; D-Sub 9-Pin Male

ype of Connector; D-Sub 9-Pin Male

RS-232C Configurations

RS-232C Setup

( )( )

( )

EXPANDED

INPUT

VIDEO INPUT

RS-232C INPUT

(CONTROL/SERVICE)

EXTERNAL SPEAKER

Y PBP

(MONO)

AUDIO

S-VIDEO

AC INPUT

AUDIO INPUT

REMOTE CONTROL

COMPONENT INPUT

DVI INPUT

RGB INPUT

RGB OUTPUT

- 9 -

EXTERNAL CONTROL DEVICE SETUP

Set ID

Use this function to specify a monitor ID number. Refer to ‘Real Data Mapping 1’. See page 28.

• Baud rate : 115200 bps (UART)

• Data length : 8 bits

• Parity : None

* Use a crossed (reverse) cable.

• Stop bit : 1 bit

• Communication code : ASCII code

Communication Parameters

1. Press the MENU button and then use

DD /EE

button to select the SPECIAL menu.

2. Press the GGbutton and then use

DD /EE

button to select Set ID.

3. Press the GGbutton and then use F / G button to adjust Set ID to choose the desired monitor ID number. The adjustment range of Set ID is 1 ~ 99.

4. Press the ENTER button to save.

SPECIAL

Prev.

Language Key lock ISM Method Low power

Set ID

Caption / Text Captions

OSD Rotate

SPECIAL

Transmission

[Command 1]: First command to control PDP set. (j or k)

[Command 2]: Second command to control PDP set.

[Set ID]: You can adjust the set ID to choose desired monitor

ID number in special menu. Adjustment range is 1 ~ 99. When selecting Set ID ‘0’, every connected PDP set is controlled. Set ID is indicated as decimal (1~99) on menu and as Hexa decimal (0x0~0x63) on transmission/receiving protocol.

[DATA]: To transmit command data.

Transmit ‘FF’ data to read status of command.

[Cr]: Carriage Return

ASCII code ‘0x0D’

[ ]: ASCII code ‘space (0x20)’

[Command1][Command2][ ][Set ID][ ][Data][Cr]

TTransmission / Receiving Protocol

ransmission / Receiving Protocol

OK Acknowledgement

* The Monitor transmits ACK (acknowledgement) based on

this format when receiving normal data. At this time, if the data is data read mode, it indicates present status data. If the data is data write mode, it returns the data of the PC computer.

[Command2][ ][Set ID][ ][OK][Data][x]

Error Acknowledgement

* The Monitor transmits ACK (acknowledgement) based on

this format when receiving abnormal data from non-viable functions or communication errors.

[Command2][ ][Set ID][ ][NG][Data][x]

Data 1: Illegal Code

2: Not supported function 3: Wait more time

01. Power k a 0 ~ 1

02. Input Select k b 0 ~ 4

03. Aspect Ratio k c 0 ~ 3

04. Screen Mute k d 0 ~ 1

05. Volume Mute k e 0 ~ 1

06. Volume Control k f 0 ~ 64

07. Contrast k g 0 ~ 64

08. Brightness k h 0 ~ 64

09. Color k i 0 ~ 64

10. Tint k j 0 ~ 64

11. Sharpness k k 0 ~ 64

12. OSD select k l 0 ~ 1

13.

Remote control lock mode

k m 0 ~ 1

14. PIP/DW k n 0 ~ 3

15. PIP size k o 0 ~ 1

16. Split Zoom k p 21 ~99

17. PIP position k q 0 ~ 3

18. Treble k r 0 ~ 64

19. Bass k s 0 ~ 64

20. Balance k t 0 ~ 64

21. Color temperature k u 0 ~ 3

22. Red adjustment k v 0 ~ C8

23. Green adjustment k w 0 ~ C8

24. Blue adjustment k $ 0 ~ C8

25. PIP input source k y 0 ~ 4

26. Abnormal Status k z 0 ~ a

27. ISM Method j p 0 ~ 3

28. Low Power j q 0 ~ 1

29. Orbiter Time Setting j r 1 ~ FE

30. Orbiter Pixel Setting j s 0 ~9

31. Picture Size Setting j t 0 ~64 for Double Window mode

32. Auto Config j u 1

COMMAND 1 COMMAND 2 DATA

(Hexadecimal)

• When setting the 27 ~ 32, a menu doesn’t display on

screen.

Command Reference List

- 10 -

EXTERNAL CONTROL DEVICE SETUP

02. Input Select (Command2:b) (Main Picture Input)

G To select input source for the Monitor.

You can also select an input source using the INPUT SELECT button on the Monitor's remote control.

Transmission

Data 0 : RGB

1 : Component 2 : Video

3 : S-Video 4 : DVI

[k][b][ ][Set ID][ ][Data][Cr]

Acknowledgement

[b][ ][Set ID][ ][OK][Data][x]

01. Power (Command2:a)

G To control Power On/Off of the Monitor.

Transmission

Data 0 : Power Off 1 : Power On

[k][a][ ][Set ID][ ][Data][Cr]

Acknowledgement

[a][ ][Set ID][ ][OK][Data][x]

G To show Power On/Off.

Transmission

[k][a][ ][Set ID][ ][FF][Cr]

Acknowledgement

Data 0 : Power Off 1 : Power On

* In like manner, if other functions transmit ‘FF’ data based

on this format, Acknowledgement data feed back presents status about each function.

[a][ ][Set ID][ ][OK][Data][x]

Real data mapping 1

0 : Step 0

A : Step 10 (SET ID 10)

F : Step 15 (SET ID 15)

10 : Step 16 (SET ID 16)

64 : Step 100

05. Volume Mute (Command2:e)

G To control volume mute on/off.

You can also adjust mute using the MUTE button on remote control.

Transmission

Data 0 : Volume mute on (Volume off)

1 : Volume mute off (Volume on)

[k][e][ ][Set ID][ ][Data][Cr]

Acknowledgement

[e][ ][Set ID][ ][OK][Data][x]

03. Aspect Ratio (Command2:c) (Main picture format)

G To adjust the screen format.

You can also adjust the screen format using the ARC (Aspect Ratio Control) button on remote control or in the Screen menu.

Transmission

Data 0 : Wide screen (16:9)

1 : Normal screen (4:3) 2 : Full screen (Zoom) 3 : Horizon

[k][c][ ][Set ID][ ][Data][Cr]

Acknowledgement

* Using the PC input, you select either 16:9 or 4:3 screen

aspect ratio.

[c][ ][Set ID][ ][OK][Data][x]

04. Screen Mute (Command2:d)

G To select screen mute on/off.

Transmission

Data 0 : Screen mute off (Picture on)

1 : Screen mute on (Picture off)

[k][d][ ][Set ID][ ][Data][Cr]

Acknowledgement

[d][ ][Set ID][ ][OK][Data][x]

06. Volume Control (Command2:f)

G To adjust volume.

You can also adjust volume with the volume buttons on remote control.

Transmission

Data Min : 0 ~ Max : 64

• Refer to ‘Real data mapping1’ as shown below.

[k][f][ ][Set ID][ ][Data][Cr]

Acknowledgement

[f][ ][Set ID][ ][OK][Data][x]

07. Contrast (Command2:g)

G To adjust screen contrast.

You can also adjust contrast in the Picture menu.

Transmission

Data Min : 0 ~ Max : 64

• Refer to ‘Real data mapping1’ as shown below.

[k][g][ ][Set ID][ ][Data][Cr]

Acknowledgement

[g][ ][Set ID][ ][OK][Data][x]

- 11 -

EXTERNAL CONTROL DEVICE SETUP

09. Color (Command2:i)

G To adjust the screen color.

You can also adjust color in the Picture menu.

Transmission

Data Min : 0 ~ Max : 64

• Refer to ‘Real data mapping1’. See page 28.

[k][i][ ][Set ID][ ][Data][Cr]

Acknowledgement

[i][ ][Set ID][ ][OK][Data][x]

10. Tint (Command2:j)

G To adjust the screen tint.

You can also adjust tint in the Picture menu.

Transmission

Data Red : 0 ~ Green : 64

• Refer to ‘Real data mapping1’. See page28.

[k][j][ ][Set ID][ ][Data][Cr]

Acknowledgement

[j][ ][Set ID][ ][OK][Data][x]

08. Brightness (Command2:h)

G To adjust screen brightness.

You can also adjust brightness in the Picture menu.

Transmission

Data Min : 0 ~ Max : 64

• Refer to ‘Real data mapping1’. See page 28.

[k][h][ ][Set ID][ ][Data][Cr]

Acknowledgement

[h][ ][Set ID][ ][OK][Data][x]

13. Remote Control Lock Mode (Command2:m)

G To lock the remote control and the front panel controls on

the monitor.

Transmission

[k][m][ ][Set ID][ ][Data][Cr]

Acknowledgement

Data 0: Lock off 1: Lock on

• If you’re not using the remote control, use this mode.

When main power is on/off, remote control lock is released.

[m][ ][Set ID][ ][OK][Data][x]

14. PIP / DW (Command2:n)

G To control the PIP (Picture In picture)/DW (Double Window).

You can also control the PIP/DW using the PIPor DW button on the remote control or in the PIP/DW menu.

Transmission

Data 0: PIP/DW off

1: PIP

2: DW1 3: DW2

[k][n][ ][Set ID][ ][Data][Cr]

Acknowledgement

[n][ ][Set ID][ ][OK][Data][x]

G To adjust the screen sharpness.

You can also adjust sharpness in the Picture menu.

Transmission

11. Sharpness (Command2:k)

Data Min: 0 ~ Max: 64

• Refer to ‘Real data mapping1’. See page 28.

[k][k][ ][Set ID][ ][Data][Cr]

Acknowledgement

[k][ ][Set ID][ ][OK][Data][x]

12. OSD Select (Command2:l)

G To select OSD (On Screen Display) on/off.

Transmission

[k][l][ ][Set ID][ ][Data][Cr]

Acknowledgement

Data 0: OSD off 1: OSD on

[l][ ][Set ID][ ][OK][Data][x]

15. PIP Size (Command2:o)

G To select the PIP picture format.

You can also select the PIP picture format using WIN.SIZE on the remote control.

Transmission

[k][o][ ][Set ID][ ][Data][Cr]

Acknowledgement

Data 0: 4:3 1: 16:9

[o][ ][Set ID][ ][OK][Data][x]

16. Split Zoom (Command2:p)

G To operate split zoom function and select the split

zoom section number.

Transmission

Data Min: 21 ~ Max:99

ex. Data 21: Selection 1 of 2 split zoom.

• Refer to ‘Real data mapping 2’.

[k][p][ ][Set ID][ ][Data][Cr]

Acknowledgement

[p][ ][Set ID][ ][OK][Data][x]

Real data mapping 2

21: Selection 1 of 2 split zoom 24: Selection 4 of 2 split zoom 41: Selection 1 of 4 split zoom 42: Selection 2 of 4 split zoom 44: Selection 4 of 4 split zoom 45: Selection 5 of 4 split zoom 91: Selection 1 of 9 split zoom

99: Selection 9 of 9 split zoom

+ 25 hidden pages