LG MU-42PM12X, MU-42PM11 Service Manual

PLASMA MONITOR

SERVICE MANUAL

CAUTION

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

CHASSIS : RF-043E

MODEL : MU-42PM11 MU-42PM12X

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

: http//lgservice.com/techsup.html

- 2 -

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 [phone]

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

- 3 -

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

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

ADJUSTMENT INSTRUCTIONS ..........................................8

TROUBLE SHOOTING GUIDE...........................................13

BLOCK DIAGRAM...............................................................24

EXPLODED VIEW...............................................................26

EXPLODED VIEW PARTS LIST.........................................27

REPLACEMENT PARTS LIST............................................28

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

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

TABLE OF CONTENTS

- 4 -

Controls

Controls

Front Panel Controls

Front Panel Controls

- This is a simplified representation of a typical front panel.
The Front Panel Controls shown here may be somewhat different from your monitor.

MU-42/50PM10/11 series

MU-42/50PM20 series

ON/OFF

ON/OFF

1

2

3 4 5 6

1

4

5

6

3

2

1. Main Power Button

2. Remote Control Sensor

3. Power Standby Indicator

Illuminates red in standby mode. Illuminates green when the
Monitor 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.

DESCRIPTION OF CONTROLS

- 5 -

Connection Options

Connection Options

AC INPUT

AUDIO INPUT RGB OUTPUTRGB INPUTDVI INPUT

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE

CONTROL

( )

( )

( )

( )

EXTERNAL SPEAKER

R

L

R

L

AUDIO INPUT

VIDEO INPUT

AUDIO INPUT

S-VIDEO

YPBP

R

(MONO)

COMPONENT INPUT

R

L

5

1. REMOTE CONTROL

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

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

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

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

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

4. RGB OUTPUT PORT

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

5. COMPONENT INPUT/AUDIO INPUT JACKS

Connect a component video/audio device to these jacks.

6. S-VIDEO INPUT SOCKETS

Connect S-Video out from an S-VIDEO device to the S­VIDEO input.

NOTE: AUDIO INPUT of S-VIDEO is worked by L(mono).

7. VIDEO / AUDIO (L/MONO) INPUT SOCKETS

Connect audio/video output from an external device to
these jacks.

8. EXTERNAL SPEAKER (8 ohm output)

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

Stand’ manual.

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

Back Connection Panel

1

3

4

2

8

6

9

7

- Connection panels shown may be somewhat different from your monitor.

DESCRIPTION OF CONTROLS

- 6 -

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

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

1 2 3

4 5 6

7 8

0

9

POWER

SLEEP INPUT SELECT

APC DASP

ARC SPLIT ZOOM

PIP/DW

WIN.POSITION

SWAP

MENU MUTE

OK

VOL

POWER

REW

STOP

PLAY FF

REC

PAUSE

W

WIN.P

VOL

SUB INPUT

STOP P/STILL

REW

PLAY FF

POWER

VCR

DVD

OPEN/CLOSE

WIN.SIZE

SKIP

POWER

Switches the Monitor between

ON and STANDBY.

SLEEP

Sets the Sleep Timer.

APC

Adjusts the factory preset picture

according to the room.

ARC

Changes the picture format.

PIP/DW

Switches the sub picture on or off.

SWAP

Exchanges main and sub picture

images.

MENU

Displays on screen menus one by one.

Exits the current menu.

NUMBER buttons

VCR BUTTONS

Control some video cassette
recorders.

OK

DD / EE

Selects menu option.
Memorizes menu changes.

FF / GG

(Volume button)

Increases/decreases sound level.
Adjusts menu settings.

INPUT SELECT

Selects source:

RGB, DVI, Component,

Video, or S-Video mode.

DASP

To select the sound appropriate to
your viewing program character:

Flat, Music, Movie, Sports, SRS TSXT or
Off.

SPLIT ZOOM

Enlarges the picture.

SUB INPUT

Selects the input source for the sub
picture.

MUTE

Switches the sound on or off.

WIN.POSITION

Moves the sub picture.

Remote Control Key Functions

Remote Control Key Functions

DVD buttons

Control some DVD cassette

recorders.

WIN.SIZE

Adjusts the sub picture size.

DESCRIPTION OF CONTROLS

- 7 -

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

MODELS

42 / 1066

25.8 / 656

3.8 / 97.5

64.6 / 29.3

1024 x 768 (Dot)

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

32 ~ 104°F (0 ~ 40°C)

Less than 80%

MU-50PM10/11/20

49.3 / 1253

29.3 / 745

3.9 / 99.5

84.7 / 38.4

1366 x 768 (Dot)

Width (inches / mm)

Height (inches / mm)

Depth (inches / mm)

Weight (pounds / kg)

Resolution

Power requirement

Color

Operating Temperature Range

Operating Humidity Range

852 x 480 (Dot)

MU-42PM11/20

MU-42PM12X

AC100-240V, 50/60Hz

AC100-240V, 60Hz

SPECIFICATIONS

- 8 -

ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions apply to the RF-043E Chassis.

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 equipment.
(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 otherwise..
(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 adjustments.

O The unit must be Heat Run with a RGB Full pattern, prior to

adjustment.

O Enter into HEAT-RUN MODE

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

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 can be used to check PANEL.

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

(Especially digital pattern, cross hatch pattern), an
afterimage may occur in the black level part of the
screen.

3. Setting Up the LGIDS

(1) Install the LGIDS. (idsinst.exe)

After installation has completed, check if the file shown in
(Fig. 1) has been created.

(2) Right click on 'LGIDS' and select ‘Create Shortcut’

Then move the shortcut icon onto the desktop.

(3) Double-click on the ‘LGIDS’ icon on the desktop to

execute the program.

4. HDCP Download

4-1. Setting Up the LGIDS

(1) Click on ‘setup’ to install in your directory.
(2) After installation has completed, check if the file shown on

(Fig. 2) has been created.

(3) Copy the KEY from source CD into the HDCP directory

which was installed just now.
(DVI_orderNo_2003_data)

(4) After running HDCP(application program) which is inside

the HDCP directory, setup the Communication.
Port : COM1(modification possible)
BaudRate : 115200

4-2. KEY Generation

(Fig. 1)

(Fig. 2)

(Fig. 3)

- 9 -

ADJUSTMENT INSTRUCTIONS

(1) Click on ‘Key Generation (G)’.
(2) Input the number of the key in Generation count.

ex) If 100 Keys are required, then just register 100 and

next time it will automatically get 101.

(3) Input file : When installing the program for the first time,

you must find the original KEY that you copied and open it.
It is crucial that you copy the original KEY into this
directory.
When you use Generation, the information is recorded in
Config.ini.

(4) Click on ‘Generation’ ———————————————(1)

If it is done correctly, you will see “Job is Success.”——(2)
Click on ‘close’——————————————————(3)

(5) Check the Generation Data(Confirmation it’s possible

within HDCP\CreatedKeyFile)

(6) It is possible to check how many Generations are created

at this point.
(Fig. 5) shows that you have created 130 Generations and
you will start from 131 next time.

4-3. HDCP Download Method

(1) Input power of Stand-By 5V.

(Download must be executed only when it is on Stand-by)

(2) The RS-232C(9PIN) must be connected to the COM1 on

the PC.

(3) If all the preparation is completed, click on ‘Download’.

(4) If abnormal state (Fig. 8) display then (3) execute.

(Fig. 4)

(Fig. 5)

(Fig. 6)

(Fig. 8) Abnormal State

(Fig. 7) Normal State

- 10 -

5. POWER PCB Assy Voltage
Adjustments

(Va, Vs Voltage Adjustments)

5-1. Test Equipment :D.M.M. 1EA

5-2. Connection Diagram for Measuring

Refer to (Fig 9).

5-3. Adjustment Method for

P/No. 3501V00182A/B B/D

(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) Turn RV601, to adjust the Va voltage to match the value
marked on the label on the right/top of the panel.
(Deviation; ±0.5V)

(2) Vs Adjustment

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

2) Turn RV401, to adjust the Vs voltage to match the value
marked on the label on the right/top of the panel.
(Deviation; ±0.5V)

5-4. Adjustment Method for

P/No. 3501V00187A B/D

(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) Turn RV501, to adjust the Va voltage to match the value
marked on the label on the right/top of the panel.
(Deviation; ±0.5V)

(2) Vs Adjustment

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

2) Turn RV401, to adjust the Vs voltage to match the value
marked on the label on the right/top of the panel.
(Deviation; ±0.5V)

6. DDC Data Input

6-1. Required Test Equipment

(1) A jig for adjusting PC, DDC (PC serial to D-sub

Connection equipment)
(2) S/W for writing DDC (EDID Data Write & Read)
(3) D-sub 15P Cable, D-Sub to DVI Connector (Connect to

DVI Jack)

6-2. Setting of Device

6-3. Preparation for Adjustment

(1) Set devices as above and turn the PC and jig on.
(2) Put S/W for writing DDC (EDID data Write & Read) into

operation. (operated in DOS mode.)

ADJUSTMENT INSTRUCTIONS

Each PCB assembly must be checked by Check JIG Set
before assembly. (Take special note of the Power PCB, which
can easily damage the PDP module)

(Fig. 9-1) Connection Diagram of Power Adjustment for

Measuring(3501V00182A/B)

(Fig. 9-2) Connection Diagram of Power Adjustment for

Measuring(3501V00187A)

(Fig. 10)

- 11 -

ADJUSTMENT INSTRUCTIONS

6-4. Sequence of Adjustment

(1) DDC Data Input for Analog-RGB

1) Put the set on the table and turn the power on.

2) Connect PC Serial to D-sub 15P Cable of jig for DDC
adjustment to RGB terminal (D-Sub 15Pin).

3) Operate S/W for DDC record and select DDC data for
Analog RGB in Model Menu.

4) Operate EDID Write command.

5) Operate EDID Read command and check whether
Check Sum is as below.
MU-42PM11: CB
MU-42PM12X/MU-50PM10: DC

6) If Check Sum is not CB(or DC), repeat 3) ~ 4).

7) If Check Sum is CB(or DC), DDC data for Analog-RGB
input is completed.

(2) DDC Data input for Digital-RGB(DVI)

1) Connect PC Serial to DVI Cable of jig for DDC
adjustment to DVI terminal (DVI Jack).

2) Operate S/W for DDC record and select DDC data for
digital RGB in model menu.

3) Operate EDID Write command.

4) Operate EDID Read command and check whether
Check sum is as below.
MU-42PM11: 4A
MU-42PM12X/MU-50PM10: CD

5) If Check sum is not 4A(or CD), repeat 3) ~ 4).

6) If Check sum is 4A(or CD), DDC data for Analog-RGB
input is completed.

7. Adjustment of White Balance

7-1. Required Equipment

Color Analyzer (CA-100 or similar product)

7-2. Connection Diagram of Equipment for

Measuring

7-3. Adjustment of White Balance

O Operate the Zero-calibration of the CA-100, then stick

sensor to PDP module surface when you adjust.

O Manual adjustment is also possible by the following

sequence.

(1) Select white pattern of heat-run mode by pressing power

key on the Service Remote Control (S R/C) then allow to
heat run at least 15 minutes.

(2) Supply Window Pattern signal to DVI input using Pattern

Generator.

1) Input Signal: XGA 60Hz

2) Input the Window Pattern(Horizontal 25%, Vertical
50%(Top High 25% + Bottom Low 25%))
(Refer to Fig. 11)

(3) Press the FRONT-AV KEY on R/C for converting input DVI

mode.
(4) Press ADJ key twice on S R/C. (White Balance)
(5) High Adjustment

Stick sensor to center of 160 Gray Level(High Window

Pattern), select Red Gain and Green Gain using

D, E key

on S R/C.

Press VOL +, - keys to adjust until color coordination

matches below.

X; 0.285±0.003, Y; 0.285±0.003

(6) Low Adjustment

Stick sensor to center of 80 Gray Level(Low Window

Pattern), select Red Offset and Green Offset using

D, E

key on S R/C.

Press VOL +, - keys to adjust until color coordination

matches below.

X; 0.285±0.006, Y; 0.285±0.006

(7) Repeat above step (5) and (6) for the best condition of

High and Low.
(8) Exit adjustment mode using

A Key.

8. Auto Component Color Balance

8-1. Required Test Equipment

Pattern Equipment: MSP3240A or similar product
(16 Gray Scale Pattern output(Component output Level:

0.7Vp-p)

8-2. Method of Auto RGB Color Balance

(1) Input RGB Source : Component 720p 16 Gray Scale

Pattern

At this time, input the Y, Pb and Pr signal.
(2) Press ADJ KEY on the S R/C.
(3) Press Vol. + KEY and operate To set.
(4) Auto-RGB OK means completed adjustment.

1/4 H

1/4 H

1/4 W

High

160 gray

Low

80 gray

RS-232C Serial Communication

DVI Signal Input

XGA 60Hz Signal

COLOR ANALYZER

TYPE; CA-100

Window

MSPG-2100 or
MSTG-5200

(Fig. 11) White Balance Adjustment

- 12 -

9. Auto RGB Color Balance

9-1. Required Test Equipment

Pattern Equipment: PC Pattern Generator (VG828, VG854,
801GF, MSP3240A)
(16 Gray Scale Pattern output(RGB output Level: 0.7Vp-p)

9-2. Method of Auto RGB Color Balance

(1) Input RGB Source : XGA 60HZ 16 Gray Scale Pattern
(2) Press ADJ KEY on the S R/C.
(3) Press Vol. + KEY and operate To SET.
(4) Auto-RGB OK means completed adjustment.

10. Auto Adjustment Map(RS-232C)

(Fig. 12) Auto RGB/ Component Color Balance Test Pattern

Type

Baud Rate

115200

Index

R Gain

G Gain

B Gain

R Offset

G Offset

B Offset

Data bit

8

Cmd1 Cmd2

j a
j b
j c
j d
j e
j f

Stop bit

1

Parity

NONE

RF-043A

Protocol

Setting

Data Min Value

00(00)
00(00)
00(00)
00(00)
00(00)
00(00)

Max Value

255(FF)
255(FF)
255(FF)
255(FF)
255(FF)
255(FF)

RS232

ADJUSTMENT INSTRUCTIONS

- 13 -

TROUBLE SHOOTING GUIDE

1. Power Board

1-1. General Power Flow

Start check

Manufacture enterprise

meaning of a passage

1. Check the Power Off
condition.

Doesn't the

screen whole come

out?

It is identical

with Power Off

condition?

Yes

Yes

No

No

No

No

No

2. Check the Interface
signal condition.

Is the Interface

signal operated?

Yes

3. Check the St-by 5V
signal circuit.

Doesn't the

low pressure output

come out?

Doesn't the

St-by 5V signal

come out?

Yes

Yes

No

4. Check the 5V Monitor
signal circuit.

Doesn't the

5V Monitor signal

come out?

Yes

7. Check the VSC Vs-ON
signal

Doesn't the

high tension output

come out?

Doesn't the

VSC signal Vs-ON

come out?

Yes

Yes

High tension

output voltage Drop

it occurs?

When

remove the

Y B/D Module

Input Connector, output

voltage Drop

it occurs?

When remove

the Y, Z B/D Module

Input Connector, Power

Board high tension output

voltage Drop

it occurs?

Yes No No

9. Check the Power
Board Output high

tension circuit

Yes

10. Check the Z B/D

Module Coutput circuit

Yes

When

remove the

Z B/D Module

Input Connector, output

voltage Drop

it occurs?

11. Check the Y B/D

Module Coutput circuit

Yes

No

8. Check the Vs, Va

voltage output circuit.

Doesn't the

Vs, Va voltage output

come out?

Yes

No

No

5. Check the VSC RL-ON
signal.

Doesn't the

VSC signal RL-ON

come out?

Yes

6. Check the VSC low
pressure output

Doesn't the

VSC low pressure

output come out?

Yes