LG 42PX4RV/RVA Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : MF-056A

MODEL : 42PX4RV/RVA

42PX4RV/RVA-ZA

website:http://biz.LGservice.com

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

PR

VOL

MENUTV/AV

OK

- 2 -

CONTENTS

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

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

SPECIFICATIONS................................................................................................9

ADJUSTMENT INSTRUCTIONS .......................................................................11

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

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

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

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

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

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

Remote Control Key Functions

- 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.

MODE

TV/AV

TV

DVD

VCR

PIP

ZOOM -

ZOOM +

MUTE

TEXT/

*

SLEEP

LIST

I/II

AUDIO

PIP PR -

PIP PR +

SWAP

PIP INPUT

STB

MENU

ARC

SSM

FAVOURITE

SIZE POSITION INDEX

HOLD

TIME REVEAL MIX

MODE

Q.VIEW

PSM

OK

VOL PR

MULTIMEDIA

POWER

CABLE

M

?

EXIT

MULTIMEDIA

Selects the Component, RGB or HDMI
modes.
switches the set on from standby.

PIP

Switches the sub picture on or off.

Selects PIP or DW modes.

PIP PR + /-

Selects a programme for the sub picture.

SWAP

Alternates between main and sub picture.

PIP INPUT

Selects the input mode for the sub picture.

SIZE

Adjusts the sub picture size.

POSITION

Moves the sub picture to

DD/ EE

or FF / GG

direction.

POWER

switches the set on from standby or off to
standby.

ARC

Changes the picture format.

OK

accepts your selection or displays the cur­rent mode.

DD/ EE

or FF / GG
Adjusts menu settings.
Selects menu item.

MENU

Displays on screen menus one by one.

Exits the current menu.

Memorizes menu changes.

ZOOM - / ZOOM +

Enlarges or reduces the main picture size.

TEXT/

*

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.

SSM

To select the sound appropriate to your

viewing programme character.

NUMBER buttons

SLEEP

Sets the sleep timer.

I/II
Selects the language during dual lan­guage broadcast.
Selects the sound output.

LIST

Displays the programme table.

TV/AV

Selects the TV, AV, Component, RGB or

HDMI modes.

switches the set on from standby.

MODE

Selects another device.

MUTE

Switches the sound on or off.

VOL +/- (Volume Up/Down)

Increases/decreases sound level.

PR +/- (Programme Up/Down)

Selects a programme.

PSM

Adjusts the factory preset picture accord­ing to the room.

Q.VIEW

Returns to the previously viewed pro­gramme.

FAVOURITE

selects a favorite programme.

EXIT

Clears all on-screen displays and returns
to TV viewing from any menu.

VCR BUTTONS

Controls a LG video cassette recorder.

- 4 -

DESCRIPTION OF CONTROLS

- 5 -

Location and Function of Controls

<Front Panel Controls>

PR

VOL

MENUTV/AV

OK

PR

VOL

MENUTV/AV OK

2

1 3 4 5 6

7

8

1. Power Button

Switches the set on from standby or off to standby.

2. Remote Control Sensor

3. TV/AV Button

Selects the TV, AV, Component, RGB or HDMI modes.
Switches the set on from standby.

4. MENU

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

5. OK

Accepts your selection or displays the current mode.

6. DD / EE (Programme Up/Down)

Selects a programme or a menu item.
Switches the set on from standby.

FF / GG (Volume Up/Down)

Adjusts the volume.
Adjusts menu settings.

7. Power Indicator

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

8. Intelligent Eye

Adjusts picture according to the surrounding conditions.

- 6 -

Location and Function of Controls

<Back Panel>

S-VIDEO

VIDEOAUDIOR

L/MONO

AAV5V5

AC INPUT

Antenna

AUDIO AUDIO

L R

VIDEO VIDEO

COMPONENTCOMPONENT

AUDIO AUDIO

L

R

V VARI ABLE ARIABLE
AUDIO OUTAUDIO OUT

AUDIO AUDIO

(MONO)(MONO)

L R

S-VIDEOS-V IDEO VIDE OVIDEO

AAV4V4

AAV1V1

AAV2V2

AAV3V3

HDMI/
DVI(VIDEO)

AUDIO INPUT

RGB INPUT

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE
CONTROL

1. HDMI(DVI VIDEO) / AUDIO INPUT / RGB INPUT

Connect the monitor output socket of the PERSONAL COM­PUTER, DVD or STB to this socket.

Note: If you want to use RGB/DVI audio, we strongly recom­mend that you use the cable that has a core, or the EMI Filter
core along with separate cable.

2. CONTROL LOCK / REMOTE CONTROL

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

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

4. COMPONENT INPUT

Connect DVD video outputs to Y, PB, PR of COMPONENT
INPUT and audio outputs to Audio sockets of AUDIO INPUT.

AUDIO/VIDEO IN SOCKETS (AV4)

Connect the audio/video out sockets of external equipment to
these sockets.

S-VIDEO/AUDIO IN SOCKETS

Connect the S-VIDEO out socket of an VCR to the S-VIDEO
socket.
Connect the audio out sockets of the VCR to the audio sock­ets as in AV4.

5. VARIABLE AUDIO OUTPUT

6. EURO SCART SOCKET

Connect the euro scart socket of the VCR to these sockets.

Note: If you want to use the EURO scart cable, you have to
use the signal shielded Euro scart cable.

7. ANTENNA INPUT

8. POWER CORD SOCKET

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

9. AUDIO/VIDEO INPUT (AV5)
S-VIDEO/AUDIO IN SOCKETS

1

42 3 6 75 8

9

- Shown is a simplified representation of the set.

- Here shown may be somewhat different from your set.

- This manual explains the features available on the 42PX4RV series / RT-42PX40 series.

- 7 -

Displayable Monitor Specification

RGB / HDMI mode

Resolution

640x350

720x400

640x480

848x480

800x600

Horizontal

Frequency(KHz)

Vertical

Frequency(Hz)

852x480

832x624

1024x768

1152x864

1152x870
1280x960

1280x1024

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

75.06

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

54.348

63.995

67.500

68.681

60.023

63.981

- 8 -

AS mark

LG TV

Owner’s Manual

1.5V

1.5V

Alkaline batteries

Power Cord

MODE

TV/AV

TV

DVD

VCR

PIP

ZOOM-

ZOOM+

MUTE

TEXT/

*

SLEEP

LIST

I/II

AUDIO

PIPPR-

PIPPR+

SWAP

PIPINPUT

STB

MENU

ARC

SSM

FAVOURITE

SIZE POSITION INDEX

HOLD

TIME REVEAL MIX

MODE

Q.VIEW

PSM

OK

VOL PR

MULTIMEDIA

POWER

CABLE

M

?

EXIT

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

Tilt wall mounting bracket

Video cables Audio cables

Ceiling mounting bracket

40

42

50

42

40

- Secure the set assembly by joinning it to a wall by using the Eye Bolts/Wall brackets.

Joinning the set assembly to the wall to protect the set tumbling

• After the set must be mounted on a desktop, install the Eye Bolts on the set as
shown.
Insert the 2 Eye Bolts and tighten securely, in the holes on the bracket.
Install the wall brackets on the wall with 2 bolts, (not supplied with the product),
as shown.
Match the height of the Eye Bolts and the wall brackets.
Check to be sure the brackets are tightened securely.

• Secure the set assembly to the wall with strong strings or wound wire cables,

(not supplied with the product), as shown.

2-Wall brackets

2-Eye Bolts

SPECIFICATIONS

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

.

- 9 -

V Application Range

This spec is applied to the 42”PDP TV used MF-056A Chassis.

V Specification

Each part is tested as below without special appointment.

1) Temperature : 25±5°C (77±9°F), CST : 40±5

2) Relative Humidity: 65

±10%

3) Power Voltage: Standard Input voltage (100-240V~, 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 Method

1) Performance : LGE TV test method followed.

2) Demanded other specification

Safety: CE, IEC specification
EMC : CE, IEC

V General Specification

1. General Specification

Remark
Safety : IEC60065, EMI : CISPRI3
Safety : IEC/EN60065, EMI : EN55013, EMS : EN55020

Model Name
42PX4RV-TA
42PX4RV-ZA

Market

Non-EU

EU

Remark

PDP

LGE SPEC

Maker : SONY/ Murata/ Sanken

Specification
42 inch wide Color Display Module
16:9
PDP42V7xxxx
RGB Closed Type, Film Filter

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

Item
Display Screen Device
Aspect Ratio
PDP Module

Operating Environment

Storage Environment

Input Voltage

2. Model Specification

2.1. 42PX4RV-TA

2.2. 42PX4RV-ZA

- 10 -

Item
Market
Broadcasting system
Available Channel

Receiving system
Video Input (2EA)
Video Output(1EA)
S-Video Input(2EA)
Component Input(2EA)
RGB Input(1EA)

HDMI Input(1EA)

Audio Input(5EA)
Wired Control
Audio variable out

No

1
2
3

4
5
6
7
8
9

10

11
12
13

Specification
Non-EU
PAL B/G/I/D/K, NTSC

BAND PAL NTSC

VHF/UHF C1~C69 2~83

CATV S1~S47 1~71
Upper Heterodyne
PAL, SECAM, NTSC
PAL, SECAM, NTSC
PAL, SECAM, NTSC
Y/Cb/Cr, Y/Pb/Pr
RGB-PC
RGB-DTV
HDMI-PC
HDMI-DTV
PC Audio, Component(2EA), AV(2EA)

Remark

4 System :

PAL, SECAM, NTSC,PAL60

4 System :

PAL, SECAM, NTSC,PAL60

4 System :

PAL, SECAM, NTSC,PAL60

L/R Input

Item
Market
Broadcasting system
Receiving system
Scart Jack(3EA)
Video input(2EA)
S-Video Input(2EA)
Component Input(2EA)
RGB Input(1EA)

HDMI Input(1EA)

Audio Input(5EA)
Wired Control

No

1
2
3
4
5
6
7
8

9

10
11

Specification
EU
PAL B/G/I/D/K, SECAM L/L’
Upper Heterodyne
PAL, SECAM
PAL, SECAM, NTSC
PAL, SECAM, NTSC
Y/Cb/Cr, Y/Pb/Pr
RGB-PC
RGB-DTV
HDMI-PC
HDMI-DTV
PC Audio, Component, AV(2EA)
Discrete IR

Remark

4 System : PAL, SECAM, NTSC,PAL60
4 System : PAL, SECAM, NTSC,PAL60

L/R Input

- 11 -

ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions apply to the MF-056A 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 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 PANEL.

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

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

3. Channel memory

3-1. Setting up the LGIDS

1) Install the LGIDS. (idsinst.exe)

2) After installation, restart your PC.

3) Extract [files.zip] to folder [c:\LGIDS\files].

4) Start LGIDS.

3-2. Channel memory Method

1) Select “PDP” and “Hurricane” on Model dialog. And check
your connection in Communication dialog. (If your
connection is ‘NG’, then set your PORT(COM1,2,3,...)
correctly.)

2) Connect RS-232C cable and turn on the power.
(If your connection has completed, you can see “Ready”.)

[ If your set is not an end products but only a board, you

have to make your board to Stand-by state (LED_R). And
you have to Download in Stand_by power state.

3) Select proper CH_memory file(*.nvm) for each model at
[NVRAM Download]

$ [Write Batch]
Next, select proper binary file(*.bin) including the CH
information for each model at [NVRAM File].

4) Click the [Download] button.
It means the completion of the CH memory download if all
items show ‘OK’ and Status is changed by ‘PASS’ at the
lower right corner of the window.

5) If you want to check whether the CH information is
memorized correctly or not, click the [Verify] button.
And then compare NVRAM File(*.bin) with the CH
information downloaded.

3-3 Sub program download

1) Select “PDP” and “Hurricane” on Model dialog. And check
your connection in Communication dialog. (If your
connection is ‘NG’, then set your PORT(COM1,2,3,...)
correctly.)

(Fig. 1)

(Fig. 3)

(Fig. 3-1)

- 12 -

2) Connect RS-232C cable and turn on the power. (Use the
special Cable For Sub-program) (If your connection has
completed, you can see “Ready”)

4. POWER PCB Assy Voltage
Adjustments

(Va, Vs Voltage Adjustments)

4-1. Test Equipment :D.M.M. 1EA

4-2. Adjustment Method

[P/No 3501V00220A(Sanken PSU) 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 P807, connect

- terminal to GND pin of P807.

3) After turning RV501, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)

(2) Vs Adjustment

1) Connect + terminal of D.M.M to Vs pin of P807, connect
– terminal to GND pin of P805.

2) After turning RV401, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)

5. EDID (The Extended Display
Identification Data)/ DDC (Display
Data Channel) download

5-1. Required Test Equipment

1) Adjusting PC with S/W for writing EDID Data.(S/W : EDID
TESTER Ver.2.5)

2) A Jig for EDID Download

3) Cable : Serial(9Pin or USB) to D-sub 15Pin cable, D-sub
15Pin cable, DVI to HDMI cable

5-2. Setting of device

5.3. Preparation for Adjustment

1) As above Fig. 5, Connect the Set, EDID Download Jig, PC
& Cable.

2) Turn on the PC & EDID Download Jig. And Execute the
S/W : EDID TESTER Ver,2.5

3) Set up S/W option

Repeat Number : 5
Device Address : A0
PageByte : 8

4) Power on the Set

5.4. Sequence of Adjustment

(1) DDC data of Analog-RGB

1) Init the data

2) Load the EDID data.(Open File)

[Analog-RGB : MF056A_RGB.ANA]
[digital(HDMI) : MF056A_DMI.DVI]

3) Set the S/W as below.

4) Push the “Write Data & Verify”button. And confirm “Yes”.

5) If the writing is finished, you will see the “OK” message.

Each PCB assembly must be checked by check JIG set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)

(Fig. 4) Connection diagram of power adjustment for measuring

(Fig. 5) Connection Diagram of DDC download