LG 42PX3RV, 42PX3RVB, 42PX3RV-ZA, 42PX3RVB-ZA Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : MF-056A

MODEL : 42PX3RV/RVB

42PX3RV/RVB-ZA

website:http://biz.LGservice.com

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

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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 ..................................................................................

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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 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

POWERMUTE

TV/AV

MULTIMEDIA

LIST ARC

VOL

1 2 3

4 5 6

PSM

SSM

8 9

VOL

SPLIT ZOOM

PIP/DW

SLEEP

REVEAL

TEXT/

PIP PR+

WIN. SIZE

MIX

PIP PR-

POSITION

TIME

SWAP

HOLD

INDEX

PIP INPUT

I/II

MULTIMEDIA

Selects the Component, RGB or DVI

modes.

switches the set on from standby.

PIP/DW

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 pic-

ture.

PIP INPUT

Selects the input mode for the sub pic-

ture.

WIN.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.

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

SWAP

Returns to the previously viewed programme.

Note : This function works only when Favourite programme is set to

Off. Otherwise each press of this but-

ton will select a stored favorite programme.

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.

TEXT/

These buttons are used for teletext. For further details, see the ÔTeletextÕ section.

Note : In teletext mode, the PIP PR +/-, SWAP and PIP INPUT buttons are

used for teletext function.

LIST

Displays the programme table.

TV/AV

Selects the TV, AV, Component, RGB

or DVI modes.

switches the set on from standby.

MUTE

Switches the sound on or off.

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.

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.

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DESCRIPTION OF CONTROLS

- 5 -

VOL

MENUTV/AV OK

VOL

MENUTV/AV OK

5 6 7

1. Remote Control Sensor

2. Power Indicator

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

3. Power Button

Switches the set on from standby or off to standby.

4. TV/AV Button

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

5. MENU

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

6. OK

Accepts your selection or displays the current mode.

7. 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.

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S-VIDEO

VIDEOAUDIOR

L/MONO

A/V INPUT2A/V INPUT2

AC INPUT

RS-232C INPUT

(CONTROL/SERVICE)

S-VIDEOS-VIDEO

(MONO)

AUDIO AUDIO

L R

AUDIO AUDIO

L R

AUDIO AUDIO

L R

Antenna

VIDEO VIDEO

REMOTE CONTROL

HDMI/ DVI(VIDEO)

AUDIO INPUT

RGB INPUT

VIDEOVIDEO

COMPONENTCOMPONENT INPUT INPUT 2 2

COMPONENTCOMPONENT INPUT INPUT 1 1

MONITMONITOR OUTPUTOR OUTPUT

A/V INPUTA/V INPUT 1 1

VVARIABLE ARIABLE AUDIO OUTAUDIO OUT

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.

5. VIDEO/AUDIO IN/OUT SOCKETS (A/V INPUT 1)

Connect the video/audio 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 A/V INPUT 1.

6. VARIABLE AUDIO OUTPUT

7. ANTENNA INPUT

8. POWER CORD SOCKET

This the 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 (A/V INPUT 2) S-VIDEO/AUDIO IN SOCKETS

3 5

- 7 -

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

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

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AS mark

LG TV

OwnerÕs Manual

1.5V

Alkaline batteries

Power Cord

POWERMUTE

TV/AV

MULTIMEDIA

LIST ARC

VOL

1 2 3

4 5 6

PSM

SSM

8 9

VOL

SPLIT ZOOM

PIP/DW

SLEEP

REVEAL

TEXT/

PIP PR+

WIN. SIZE

MIX

PIP PR-

POSITION

TIME

SWAP

HOLD

INDEX

PIP INPUT

I/II

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

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

Joinning the TV 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 TV 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

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V Application Range

This spec is applied to the 42ÓPDP 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.

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. Module Specification

Remark

Safety : IEC/EN60065, EMI : EN55013, EMS : EN55020

Model Name

42PX3RV-ZA

Market

Remark

PDP

LGE SPEC

Maker : SONY/ 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

Item

Display Screen Device

Aspect Ratio

PDP Module

Operating Environment

Storage Environment

Input Voltage

2. Model Specification (42PX3RV-ZA)

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Item

Market

Broadcasting system

Available Channel

Receiving system

SCART Jack(3EA)

Video Input (2EA)

S-Video Input(3EA)

Component Input(1EA)

RGB Input(1EA)

HDMI Input(1EA)

Audio Input(4EA)

Wired Control

Audio variable out

Specification

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

Y/Cb/Cr, Y/Pb/Pr

RGB-PC

RGB-DTV

HDMI-PC

HDMI-DTV

PC Audio, Component(1EA), AV(2EA)

Remark

4 System :

PAL, SECAM, NTSC,PAL60

4 System :

PAL, SECAM, NTSC,PAL60

4 System :

PAL, SECAM, NTSC,PAL60

L/R Input

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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 ÒPDPÓ and ÒHurricaneÓ on Model dialog. And check your connection in Communication dialog. (If your connection is ÔNGÕ, 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 ÒReadyÓ.)

[ 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 ÔOKÕ and Status is changed by ÔPASSÕ 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 ÒPDPÓ and ÒHurricaneÓ on Model dialog. And check your connection in Communication dialog. (If your connection is ÔNGÕ, then set your PORT(COM1,2,3,...) correctly.)

(Fig. 1)

(Fig. 3)

(Fig. 3-1)

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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 ÒReadyÓ)

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 Ð 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 ÒWrite Data & VerifyÓbutton. And confirm ÒYesÓ.

5) If the writing is finished, you will see the ÒOKÓ 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

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