LG 42PX5R Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : MF-056B

MODEL : 42PX5R

42PX5R-ZB

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....................................................................................16

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

MODE

INPUT

DVD

VCR

AUDIO

PIP PR -

PIP PR +

SWAP

PIP INPUT

STB

MUTE

SIZE POSITION INDEX

HOLD

TIME REVEAL MIX

MODE

SLEEP I/II

PIP

M/C EJECT

PSM SSM ARC

TEXT

Q.VIEWLIST

FAV

VOL PR

MULTIMEDIA

POWER

CABLE

EXIT

INFO i

MARK

MULTIMEDIA

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

POWER

switches the set on from standby or off to standby.

MARK

Selects the wanted functions.

Brings up the menu to select the Photo or Music mode of Xstudio for memory cards.

EXIT

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

Q.VIEW

Returns to the previously viewed programme.

M/C EJECT

Remove the Memory Card.

ARC

Changes the picture format.

FAV

selects a favourite programme.

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.

PIP

Switches the sub picture on or off. Selects PIP, POP 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.

INPUT

Selects the TV, AV1, AV2, S-Video, A V3, AV4,

AV5, Component, RGB or HDMI modes.

switches the set on from standby.

MODE

Selects another device.

VCR BUTTONS

Controls a video cassette recorder.

These buttons are used for X-Studio.

For further details, see the ‘X-Studio’ section.

Displays on screen menus one by one.

Exits the current menu.

Memorizes menu changes.

INFO

Displays information on top of the screen

whilst watching the TV.

MUTE

Switches the sound on or off.

NUMBER buttons

LIST

Displays the programme table.

PSM

Adjusts the factory preset picture according

to the room.

SSM

To select the sound appropriate to your

viewing programme.

SLEEP

Sets the sleep timer.

I/II

Selects the language during dual language

broadcast.

Selects the sound output.

VOL

DD / EE

(Volume Up/Down)

Increases/decreases sound level.

DD / EE

(Programme Up/Down)

Selects a programme.

accepts your selection or displays the

current mode.

DD/ EE

or FF / GG

Adjusts menu settings.

Selects menu item.

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DESCRIPTION OF CONTROLS

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1. Remote Control Sensor

2. Power Button

Switches the set on from standby or off to standby.

3. INPUT 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. INDEX

Switches FRONT Display on or off.

8. Power Indicator

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

9. Intelligent Eye

Adjusts picture according to the surrounding conditions.

10. Memory Card Slots 1, 2

VOL

MENUINPUT OK

2 3 4 5 6

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S-VIDEO

AAV5V5

AC INPUT

Antenna

AUDIO AUDIO

L R

VIDEO VIDEO

COMPONENTCOMPONENT

AUDIO AUDIO

V VARIABL E ARIAB LE AUDIO OUTAUDIO OUT

AUDIO AUDIO

(MONO)(MONO)

L R

S-VIDEOS-VIDEO VID EOVIDE O

AAV4V4

AAV1V1

AAV2V2

AAV3V3

HDMI/ DVI(VIDEO)

AUDIO INPUT

RGB INPUT

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE CONTROL

VIDEOAUDIOR

L/MONO

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. 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:

a. If you want to use the EURO scart cable, you have to use the signal shielded Euro scart cable. b. If the S-VIDEO(Y/C) signal is received through the Euro scart socket 2 (AV 2), you must change to the S-Video 2 (Y/C) mode.

7. ANTENNA INPUT

8. POWER CORD SOCKET

This Monitor operates on 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

42 3 6 75 8

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AS mark

LG TV

Owner’s Manual

1.5V

Alkaline batteries

Power Cord

MODE

TV/AV

DVD

VCR

PIP

ZOOM-

ZOOM+

MUTE

TEXT/

SLEEP

LIST

I/II

AUDIO

PIPPR-

PIPPR+

SWAP

PIPINPUT

STB

ARC

SSM

FAVOURITE

SIZE POSITION INDEX

HOLD

TIME REVEAL MIX

MODE

Q.VIEW

PSM

VOL PR

MULTIMEDIA

POWER

CABLE

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 the purchasing of these items.

Optional Extras

Accessories

Tilt wall mounting bracket

Video cables Audio cables

Ceiling mounting bracket

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

Joining the set assembly to the wall to prevent the set tumbling

• If the set is to be mounted on a desk top, insert the 2 Eye-Bolts and tighten them securely in the upper holes as shown. 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 Eye-Bolts and 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

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V Application Range

This spec is applied to the 42”/50” PDP TV used MF-056B 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

42PX5R-ZB

Market

Remark

PDP

Glass/ Film type filter is TBD

LGE SPEC

Maker : SONY/ Sanken

Specification 42 inch wide Color Display Module 16:9 PDP42X3####, 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

1 2 3

Item Display Screen Device Aspect Ratio PDP Module

Operating Environment

Storage Environment

Input Voltage

2. Model Specification

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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(4EA) Wired Control(1EA) Audio variable out(1EA) EPF(2 slot)

1 2 3

4 5 6 7 8 9

11 12 13 14

Specification 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(1EA), AV(2EA)

SM, MMC, SD, MS Pro, CF, Microdrive, Masicstor, XD

Remark

4 System :

PAL, SECAM, NTSC,PAL60

5 System :

PAL, SECAM, NTSC,PAL60

6 System :

PAL, SECAM, NTSC,PAL60

L/R Input

9 in 2

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ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions apply to the MF-056B 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. 2)

(Fig. 3)

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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 “Ready”)

3) Select proper ‘Model’ for each model.

4) Select ‘flash file’ for each model.

5) Click the [download] button It means the completion of the ROM download if all item show ‘OK’ and Status is changed by ‘PASS’ at the lower right corner of the window.

4. POWER PCB Assy Voltage Adjustments

(Va, Vs Voltage Adjustments)

4-1. Test Equipment :D.M.M. 1EA 4-2. Connection Diagram for Measuring

: refer to fig.5

4-3. Adjustment Method

(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. 6, 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

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

(Fig. 5) Connection diagram of power adjustment for measuring

(Fig. 6) Connection Diagram of DDC download

(Fig. 4)

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5.4. Sequence of Adjustment

(1) DDC data of Analog-RGB

1) Init the data

2) Load the EDID data.(Open File) [Analog(RGB) : H2_VGA_XGA_RGB(2B52).ANA]

- for VGA,XGA [Digital(HDMI) : H2_VGA_HDMI(CB50).DVI] - for VGA [Digital(HDMI) : H2_XGA_HDMI(0F0F).DVI] - for XGA

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.

6. Auto AV(CVBS) Color Balance

6-1. Required

- This AV color balance adjustment should be performed before white Balance Adjustment

6-2. Required Equipment

1) Remote controller for adjustment

2) AV Pattern Generator : 802F Pattern Generator, Master(MSPG-925FA), etc (Which has PAL Composite Video format output with standard(1.0 Vpp) Vertical 100% Color Bar Pattern as Fig 7)

6-3. Method of Auto Color Balance

1) Input the PAL Composite Video (Fig7. 100% Color Bar

Pattern) into video input.

2) Set the PSM to Standard mode in Picture menu.

3) Press INSTAR key on R/C for adjustment.

4) Press the

G(Vol. +) key operate to set, then it becomes

automatically.

5) Auto-RGB OK means completed adjustment.

7. Adjustment of White Balance

7-1. Required Equipment

1) Remote controller for adjustment

2) Color Analyzer (CA-100 or same product)

3) Auto W/B adjustment instrument(only for auto adjustment)

4) AV Pattern Generator

7-2. Connecting diagram of equipment for

measuring (For Auto Adjustment)

W Auto adjustment Map(RS-232C)

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 For manual adjustment, it is also possible by the following

sequence.

1) Select white pattern of heat-run mode by pressing power on key on remote control for adjustment then operate heat run more than 15 minutes.

2) As below Fig.9, Supply 216Level (85 IRE) full screen pattern to Video input.

3) Press the TV/AV KEY on R/C for converting input mode.

4) Set the PSM to Standard mode in Picture menu.

5) Enter the White Balance adjustment mode by pressing the INSTART key twice(White Balance) on R/C.

6) Stick sensor to center of the screen and select each items (Red/Green/Blue Gain and offset) using

D / E(CH +/-) key

on R/C.

Type

Baud Rate

115200

Index R Gain G Gain B Gain

R Offset G Offset B Offset

Data bit

Cmd1 Cmd2

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

Stop bit

Parity

NONE

MF-056A/ MF-056B/ MF-056C

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)

(Fig. 7) Auto AV(CVBS) Color Balance Test Pattern

(Fig. 8) Connection Diagram of Auto W/B adjustment

MSPG-

MSTG-5200

216 Level (85 IRE)

COLOR ANALYZER TYPE ; CA-100

CVBS signal input

RS-232C Serial Communication

925

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