LG 50PX4D Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : DF-054B

MODEL : 50PX4D

50PX4D-EB

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................................................................................................8

ADJUSTMENT INSTRUCTIONS .......................................................................10

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

PRINTED CIRCUIT DIAGRAM ..........................................................................24

BLOCK DIAGRAM.............................................................................................28

EXPLODED VIEW..............................................................................................30

EXPLODED VIEW PARTS LIST........................................................................31

REPLACEMENT PARTS LIST...........................................................................32

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

D/A TV

DVD

VCR

GUIDE

MUTE

SIZE UPDATE INDEX

STILL

TIME REVEAL MIX

I/II

PIP

M/C EJECT

SLEEP APM

PIP PR- PIP PR+ SWAP

PIP INPUT

Q.VIEWLIST

FAV

VOL PR

INPUT

POWER

ARC

TEXT

EXIT

INFO i

MARK

INPUT

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

POWER

switches the set on from standby or off to standby.

ARC

Changes the picture format.

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.

accepts your selection or displays the current mode.

DD/ EE

or FF/

Adjusts menu settings. Selects menu item.

Q.VIEW

Returns to the previously viewed programme.

I/II

selects the sound output or the audio mode.

SLEEP

Sets the sleep timer.

APM (Adaptive Picture Mode)

Concurrently, compare with the

Dynamic

Standard, Mild

and

User

on the screen.

FAV

selects a favourite programme.

NUMBER buttons

D/A TV

selects analogue or digital mode.

MODE

Selects another device.

GUIDE

shows a programme schedule.

(In Digital mode only)

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.

TEXT

These buttons are used for teletext.

For further details, see the ‘Teletext’ section.

COLOURED BUTTONS : These buttons are

used for teletext (only TELETEXT models)

or programme edit.

INFO

displays information on top of the screen

whilst watching the TV.

(In Digital mode only)

MUTE

Switches the sound on or off.

LIST

Displays the programme table.

M/C EJECT

Remove the Memory Card.

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.

VOL

DD/ EE

(Volume Up/Down)

Increases/decreases sound level.

DD/ EE

(Programme Up/Down)

Selects a programme.

LIGHT

Illuminates the remote control

buttons of selected

mode.

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DESCRIPTION OF CONTROLS

- 5 -

VOL

MENUINPUT OK

2 3 4 5 6

1. Power Button

Switches the set on from standby or off to standby.

2. Remote Control Sensor

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. 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.

9. Memory Card Slots 1, 2

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S-VIDEO

AAV5V5

AC INPUT

VIDEO

AUDIO

L/MONO

1. PCMCIA (Personal Computer Memory Card International Association) Card Slot

2. ANTENNA INPUT/OUTPUT

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

Connect the monitor output socket of the PERSONAL COMPUTER 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.

4. REMOTE CONTROL

5. VARIABLE AUDIO OUT SOCKETS

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

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

7. 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.

8. COMPONENT INPUT

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

9. 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 (AV2), you must change to the SAV2 mode.

10. POWER CORD SOCKET

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

11. AUDIO/VIDEO IN SOCKETS (AV5) S-VIDEO/AUDIO IN SOCKETS

1 3 4 5 6 7 8 9 10

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AS mark

LG TV

Owner’s Manual

1.5V

Alkaline batteries

Power Cord

MODE

D/A TV

DVD

VCR

GUIDE

MUTE

SIZE UPDATE INDEX

STILL

TIME REVEAL MIX

I/II

PIP

M/C EJECT

SLEEP APM

PIP PR- PIP PR+ SWAP

PIP INPUT

Q.VIEWLIST

FAV

VOL PR

INPUT

POWER

ARC

TEXT

EXIT

INFO i

MARK

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 fixing 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 50” PDP TV used DF-054B 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 : IEC/EN60065 EMI : EN55013 EMS : EN55020

V General Specification

1) Module Specification

Display Screen Device Aspect Ratio PDP Module Screen Filter Operating Environment

Storage Environment

Input Voltage

1 2 3 4 5

No Item Specification Remark

50 inch wide Color Display Module 16:9 PDP50X3####, RGB Closed Type 45% Total light transmittance (E-Mash)

1)Temp. : 0~40deg

2)Humidity : 0~85%

3)Temp. : -20~60deg

4)Humidity : 0~85% 100-240V~, 50/60Hz

PDP

Maker : NBK/ Mitsui/ LG Chemical LGE SPEC.

Maker : Sony/ LG Innotek/ Sanken

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2) Model General Specification

Market Broadcasting system

Receiving system

Scart Jack (3EA) Video (2EA) S-Video Input (2EA) Component Input (1EA) RGB Input

HDMI Input

Audio Input (4EA) Wired Control EPF (2 slot)

1 2

4 5 6 7 8

10 11 12

No Item Specification Remark

The United Kingdom

1) PAL-BG/DK/I

2) SECAM L/L’

4)DVB-T(ID TV) Analog : Upper Heterodyne Digital : COFDM PAL, SECAM PAL, SECAM, NTSC PAL, SECAM, NTSC Y/Cb/Cr, Y/Pb/Pr RGB-PC, RGB-DTV HDMI-PC HDMI-DTV & SOUND PC Audio, Component, AV (2EA) Discrete IR SM, MM, SD, MS, MS Pro, CF, Microdrive, Masicstor, XD

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

L/R Input

9 in 2

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ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions is applied all of the 42”, 50” PDP TV, DF054B 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 PATTERN MODE.

[ 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].

File name : H2_CH_Memory_RZ.nvm

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.

(Fig. 1)

(Fig. 2)

(Fig. 3)

4. Sub Program Down Load

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 RS232 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 items show ‘OK’ and Status is changed by ‘PASS’ at the lower right corner of the window.

5. PCMCIA CARD Checking Method

1) You must adjust DTV 29 Channel and insert PCMCIA CARD to socket.

2) If PCMCIA CARD works normally, normal signal display on screen. But it works abnormally, “No CA module” words display on screen.

6. POWER PCB Assy Voltage Adjustments

(Va, Vs Voltage adjustments)

6-1. Test Equipment :D.M.M. 1EA 6-2.Connection Diagram for Measuring

: refer to fig.5

6-3. 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 P807.

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)

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

7-1. 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

7-2. Setting of device

7-3. 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

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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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7-4. Sequence of Adjustment

- 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] (VGa only) [Digital(HDMI) : H2_VGA_HDMI(0F0F).DVI] (XGA only)

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.

8. Auto AV(CVBS) Color Balance

8-1. Requirement

V This AV color balance adjustment should be performed

before white Balance Adjustment.

V It is very import to use adjustment pattern like Fig.7

1) Within the pattern, color sequence should be aligned : W-Y-C-G-M-R-BLUE-BLACK (If color sequence is reversed (Black -> ... -> White), reverse the pattern with REV key, when using Master pattern generator like MSPG-925)

2) If minimum Black level and/or maximum White level is not correct, select 100% color bar pattern.

8-2. 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 Fig7)

8-3. Method of Auto AV(CVBS) Color Balance

1) Input the PAL Composite Video into video input. (Input 50Hz, 42PX5D/ 50PX4:AV4/AV5 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.

9. Adjustment of White Balance

9-1. 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

9-2. Connecting diagram of equipment for

measuring (For Auto Adjustment)

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

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

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W Auto adjustment Map(RS-232C)

9-3. Adjustment of White Balance

(For Manual adjustment)

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. (Input 50Hz, 42PX5D/50PX4D : AV4/AV5 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.

7) Adjust Only High Light with R Gain/ B Gain using

F / G

(VOL+/-) key on R/C.

8) Adjust it until color coordination becomes as below. (Initially, R/G/B gain and R/G/B offset values are fixed as below

Red Gain : 82, Green Gain : 80, Blue Gain : 86 Red Offset : 7D, Green Offset : 7E, Blue Offset : 80)

[DF-054B]-XGA 42”,50” Brightness : High Light : 80 ± 20cd/m2 Color-Coordinate : High Light : X : 0.285 ±0.003

Y : 0.290 ± 0.003

Color Temperature : 9,300°K ± 500°K

9) When adjustment is completed, Exit adjustment mode using EXIT key on R/C

10. Auto Component Color Balance

10-1. Requirement

- It is very import to use correct adjustment pattern like fig.10

V Within the pattern, color sequence should be aligned

: W-Y-C-G-M-R-BLUE-BLACK (If color sequence is reversed(Black -> ... > White), reverse the pattern with REV key, when using Master pattern generator like MSPG-925)

V If Minimum Black Level and/or Maximum White Level is not

correct, select 100% Color Bar Pattern.

9-2. Required Test Equipment

1) Remote controller for adjustment

2) 802F Pattern Generator

(Which has 720p Ypbpr output with Standard(0.7Vpp) Vertical 100% Color Bar Pattern as Fig.10)

9-3. Method of auto component color balance

1) Input the Component 720p 100% Color Bar signal into Component1 or Component2.

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

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

4) Press the

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

automatically.

5) Auto-RGB OK means complete adjustment

11. Auto RGB Color Balance

11-1. Requirement

- It is very import to use correct adjustment pattern like fig.11

V Within the pattern, color sequence should be aligned

: W-Y-C-G-M-R-BLUE-BLACK (If color sequence is reversed(Black -> ... > White), reverse the pattern with REV key, when using Master pattern generator like MSPG-925)

V If Minimum Black Level and/or Maximum White Level is not

correct, Do select 100% Color Bar Pattern.

11-2. Required Test Equipment

1) Remote controller for adjustment

2) 802F Pattern Generator, Master(MSPG-925FA), etc.

(Which has XGA 60Hz PC Format output with standard (0.7Vpp) 100% Color Bar Pattern as Fig.11)

(Fig. 10) Auto Component Color Balance Test Pattern

(Fig. 9) Pattern for Adjustment of White Balance

Win

CVBS signal inpu

COLOR ANA LYZER

TYPE; CA-

100

PDP MONITOR

High Light adjust

Low L ight adjust

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

DF-054B : 42PX4D/ 50PX4D

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)

- 14 -

11-3. Method of Auto RGB Color Balance

1) Input the PC 1024x768 60Hz 100%Color bar into RGB.

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

3) Press ADJ 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.

12. Default value in adjustment mode

12-1. Auto Color Balance (Component/RGB)

12-2. White Balance

(Fig. 13) Default Value on OSD

(Fig. 12) Default Value on OSD

Auto Color Balance(HEX)

Auto-RGB G To Set

Source Cortez Red Offset1 22 Green Offset1 24 Blue Offset1 23 Red Offset2 45 Green Offset2 43 Blue Offset2 37 Red Gain 014 Green Gain 031 Blue Gain 011 Reset G To Set

White Balance(Hex)

Red Gain 82

Red Offset 80 Green Gain 86 Green Offset 7D Blue Gain 7E Blue Offset 80 Reset G To Set

(Fig. 11) Auto RGB Color Balance Test Pattern

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