LG 42PX5D, 42PX5D-UB Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : AF-05FB

MODEL : 42PX5D 42PX5D-UB

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 same specified type.

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.

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

ADJUSTMENT INSTRUCTIONS ..........................................9

PRINTED CIRCUIT BOARDS.............................................18

BLOCK DIAGRAM...............................................................23

EXPLODED VIEW...............................................................24

EXPLODED VIEW PARTS LIST.........................................25

REPLACEMENT PARTS LIST............................................26

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

TABLE OF CONTENTS

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TV GUIDE

TV GUIDE

- This is a simplified representation of a front panel.

- Here shown may be somewhat different from your TV.

- Here shown may be somewhat different from index window position of 42PX5D model.

MENU Button

TV/VIDEO Button

VOLUME (FF,GG) Buttons

CHANNEL (EE, DD) Buttons

INDEX

Switches
LED
Display on
or off.

TV GUIDE Button

Remote Control

Sensor

Power Standby Indicator

Illuminates orange in
standby mode.
When the TV is turned on,
the indicator will blink
green for 3-4 seconds
before the picture is seen.

POWER Button

Controls

Controls

Front Panel Controls

Front Panel Controls

DESCRIPTION OF CONTROLS

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S-VIDEO

FRONT
A/V INPUT

VIDEO

L / MONO

AUDIO

R

RS-232C INPUT

(CONTROL/SERVICE)

AUDIO

R

L

DIGITAL AUDIO

(OPTICAL)

DVI

INPUT

COMPONENT2
INPUT

OUTPUT

AUDIO
INPUT

RGB INPUT

VIDEO

HDMI 2

HDMI1 /DVI

COMPONENT INPUT 1

R

L

(MONO)

CABLE

ANTENNA

AC INPUT

DVD
/DTV
INPUT

IEEE-1394

COMPONENT INPUT 2

MONITOR OUTPUT

A/V INPUT

VIDEO

AUDIO

S-VIDEO

REMOTE
CONTROL

Cable

S-VIDEO Input

A connection is available to provide
better picture quality than the video
input.

Memory Card Slots

G-LINK

TM

Connect an IR
controller to this
jack.

CableCARD™

Used for
CableCARD™
received from Cable
Service Provider.

VIDEO Input

Connects the video signal from a
video device.

AUDIO Input

Connections are available for listening
stereo sound from an external device.

Antenna Input

Connect over-the­air signals to this
jack.

RGB/AUDIO INPUT

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

Digital Audio (DVI: Digital
Visual
Interface/Component2)
Input/
Digital Audio Output

Connect digital audio from
various types of equipment.

Note: In standby mode,
these ports will not work.

DVD/DTV Input
(Component 1-2)

Connect a component

video/audio device to

these jacks.

Monitor Output

Connect a second
TV or Monitor.

Remote Control Port

Connect your wired
remote control here.

S-Video Input

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

CABLE Input

Connect cable signals to this

jack, either directly or through

a cable box.

RS-232C INPUT (CON-

TROL/SERVICE) PORT

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

HDMI1/DVI, HDMI 2

Connect a HDMI sig­nal to HDMI1/DVI or
HDMI2. Or connect a
DVI(Video) signal to
HDMI1/DVI.

Audio/Video Input

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

Power Cord Socket

This TV operates on an AC power. The voltage

is indicated on the Specifications page. Never

attempt to operate the TV on DC power.

IEEE1394

Connect a DVHS, a
MicroMV Camcorder, or
a set-top box to
IEEE1394 Connector.

Connection Options

Connection Options

Back Connection Panel

Back Connection Panel

Note: After removing the cover, you can insert the CableCARD™ or connect to the G-LINK jack.

DESCRIPTION OF CONTROLS

- 6 -

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

MODE

DAY -

DAY +

FLASHBK

APM

CC

1394

FREEZE

TV INPUT

TV/VIDEO

M/C EJECT

AUTO DEMO

EXIT

MUTE

Switches the sound on or off.

MODE

Selects the remote operating mode: TV,

DVD, VCR, AUDIO, CABLE or STB. Select

a mode other than TV, for the remote to

operate an external device.

FLASHBK

Tunes to the recent channels.

EXIT

Clears all on-screen displays and returns to

TV viewing from any menu.

TIMER

Lets you select the amount of time before

your TV turns itself off automatically.

MENU

Brings up the main menu to the screen.

Enters or exits a Panel Menu in the TV Guide

On Screen system.

PIP

Switches to PIP, POP (Picture-out-of­Picture) and Twin picture modes in regu­lar sequence.
Switches the video window locking or
unlocking in the Listings Grid.

PIPCH-/PIPCH+

Changes to the next higher/lower PIP
channel.

PIP INPUT

Selects the input source for the sub pic­ture in PIP/Twin picture mode.

SWAP

Exchanges the main/sub images in
PIP/Twin picture mode.

EZ PIC

Selects a factory preset picture mode

depending on the viewing environment.

ADJUST

Adjusts screen position, size, and phase in

PC mode.

FREEZE

Freezes the currently-viewed picture. Main

picture is frozen in PIP/Twin picture mode.

TV/VIDEO

External input modes rotate in regular
sequence: Antenna, Cable, Video, Front
Video, Component 1-2, RGB-DTV (or
RGB-PC), HDMI1/DVI and HDMI2 input
sources.
(Video, Front Video, Component 1-2 input
sources are linked automatically, only if
these are connected )

POWER

Turns your TV or any other programmed

equipment on or off, depending on mode.

TV GUIDE

Brings up the TV Guide On Screen sys­tem to the screen.

Mark

Selects a photo or music you want to
view or play in Xstudio mode.

LIGHT

Illuminates the remote control

buttons of selected mode.

INFO

Channel information is displayed on top of
the screen. But not available in
Component 1-2, RGB, HDMI1/DVI and
HDMI2 mode.

FAV

Scrolls the Favorite channels.

AUTO DEMO

Starts the demonstration to explain the main

features of this TV.

Remote Control Key Functions

Remote Control Key Functions

DESCRIPTION OF CONTROLS

- 7 -

DAY+/DAY-

Moves the Listings Grid forward or back­ward in 24 hour increments.

MODE

DAY -

DAY +

FLASHBK

APM

CC

1394

FREEZE

TV INPUT

TV/VIDEO

M/C EJECT

AUTO DEMO

EXIT

NUMBER buttons

VCR/DVD BUTTONS

• Controls some video cassette recorders
or DVD players. ("RECORD" button is not
available for DVD players.)
< Only TV mode >

•In Photo mode of Xstudio, the view state
changes to the slide show state with the
“PLAY” button and the slide show state
changes to the view state with the
“PAUSE” button.

• In Music mode of Xstudio, these controls
are functional “PAUSE”, “STOP”, ”PLAY”,

”(Left/Right) SKIP” buttons. Note that FF
and REW do not work in this mode.

•Controls the DVHS or Camcorder in IEEE
1394 mode.

RATIO

Changes the aspect ratio.

CC

Select a closed caption:

Off, CC1~4, Text1~4.

THUMBSTICK (Up/Down/Left/Right/ENTER)

Allows you to navigate the on-screen menus

and adjust the system settings to your pref-

erence.

CHANNEL UP/DOWN

Selects available channels found during
Manual scan.

PAGE UP/PAGE DOWN

Moves from one full set of screen infor­mation to the next one.

SAP

Selects MTS sound: Mono, Stereo, and

SAP in Analog mode. Change the audio lan-

guage in DTV mode.

EZ SOUND

Selects the sound appropriate for the
program's character.

APM (Adaptive Picture Mode)

Concurrently, compare with the
Daylight, Normal, Night Time and
Custom on the screen.

VOLUME UP/DOWN

Increases/decreases the sound level.

1394

Brings up the menu to select the Photo or

Music mode of Xstudio for memory cards.

M/C EJECT

Remove the Memory

Card.

TV INPUT

• Rotates the input mode between Antenna
and Cable.

• Video, Front Video, Component 1-2,
RGB-DTV (or RGB-PC), HDMI1/DVI,

HDMI2

and IEEE1394 input sources, screen

returns to the last TV.

DESCRIPTION OF CONTROLS

- 8 -

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

MODELS

AC100-240V ~ 50/60Hz

NTSC-M, ATSC

VHF 2 ~ 13, UHF 14 ~ 69, DTV 2 ~ 69, CATV 1 ~ 135, CADTV 1 ~ 135.

75 Ω

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

32 ~ 104°F (0 ~ 40°C)

Less than 80%

6561 feet (2000m)

49.3 / 1252

27.8 / 705.5

11.3 / 286.7

85.3 / 38.7

1024x768 (Dot)

Width (inches / mm)

Height (inches / mm)

Depth (inches / mm)

Weight (pounds / kg)

Resolution

Power requirement

Television System

Program Coverage

External Antenna Impedance

Color

Operating Temperature Range

Operating Humidity Range

Maximum Elevation

42PX4D-UB / 42PX5D-UB

SPECIFICATIONS

1. Application Object

These instructions are applied to all of the PDP TV, AF-05FB.

2. Notes

(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) Adjustments must be done in the correct order.
(3) The adjustments 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 be must kept 110V, 60Hz

when adjusting.
(5) The receiver must be operational for about 15 minutes

prior to the adjustments.

1) After receiving 100% white pattern, the receiver must be
operated prior to adjustment. (Or 7. White Pattern
condition in EZ - Adjust)

2) Enter into White Pattern

- Press POWER ON Key on the Service Remote

Control (S R/C)

- Enter the Ez - Adjust by pressing ADJ Key on the

Service Remote Control (S R/C).

- Select the 7. White Pattern using CH +/- Key and

press the Enter(

Y) Key.

Display the 100% Full White Pattern.

[ Set is activated HEAT-RUN without signal generator in

this mode.

If you turn on a still screen more than 20 minutes (Especially
Digital pattern(13 CH), Cross Hatch Pattern), an afterimage
may occur in the black level part of the screen.

3. EPLD Download

(1) Test Equipment: PC, Jig for download
(2) Connect the power of VSC B/D.
(3) Execute download program(iMPACK) of PC.
(4) After executing the hot key on the Programmer, click icon
(5) End after confirming

4. Gemstar VBI Micom Download

4-1. Preparation for Adjustment

(1) As shown below, connect the MPLAB ICD2 equipment, PC

and Digital Connector.
(2) Turn on the MPLAB ICD2 POWER Supply.
(3) After turn on the PC and MONITOR, select the ‘MPLAB

IDE’ from the screen.

4-2. Adjustment Sequence

(1) When the program is executed, select the MPLAB ICD2

from Programmer -> Select Programmer .

(2) Select "Configure -> Select Device".

(3) When the "Select Device" window appears, select the

PIC18F1220 from "Device" and press OK.

- 9 -

ADJUSTMENT INSTRUCTIONS

PC

VSC

B/D

<Fig 1> Connection Diagram of EPLD Download

+13V

<Digital Board>

Connect the MPLAB ICD2 and connector of Digital Board

Connect the RS-232 or USB Cable

GND
Data

- 10 -

ADJUSTMENT INSTRUCTIONS

(4) Select "Programmer -> Connect".

When connected with the Micom, the display message on
the Output window appears as below.

(5) Select "File -> Import", select the Work HEX file and open.

(6) Select "Programmer -> Program".

(7) Download is executed and about 5 seconds later, the

"Programming succeeded" message is displayed on the
Output window and the Download process is ended.

(8) The execution of process (6) is convenient when using the

short-cut icon.

5. Gemstar IR Micom Download

5-1. Preparation for Adjustment

(1) As shown below, connect the MPLAB ICD2 equipment, PC

and Digital Connector.
(2) Turn on the MPLAB ICD2 POWER Supply.
(3) After turn on the PC and MONITOR, select the ‘MPLAB

IDE’ from the screen.

5-2. Adjustment Sequence

(1) When the program is executed, select the MPLAB ICD2

from "Programmer -> Select Programmer" .

(2) Select "Configure -> Select Device".

+13V
+5V
GND
Data
Clock

<Digital Board>

Connect the MPLAB ICD2 and connector of Digital Board

Connect the RS-232 or USB Cable

Connecting to MPLAB ICD 2
...Connected
Setting Vdd source to MPLAB ICD 2
Target Device PIC18F1220 found, revision = 0x4
...Reading ICD Product ID
Running ICD Self Test
...Passed
MPLAB ICD 2 Ready

- 11 -

ADJUSTMENT INSTRUCTIONS

(3) When the "Select Device" window appears, select the

PIC18F242 from "Device" and press OK.

(4) Select "Programmer -> Connect".

When connect with the Micom, the display message on the
Output window appears as below.

(5) Select "File -> Import", select the Work HEX file and open.

(6) Select "Programmer -> Program".

(7) Download is executed and about 3 seconds later, the

"Programming succeeded" message is displayed on the

Output window and the Download process is ended.

(8) The execution of process (6) is convenient when using the

short-cut icon.

6. POD Certificate Download &
IEEE1394(DTCP) Download

6-1. Preparation for Adjustment

(1) Connect the MEMORY JIG and PC.
(2) Turn on the JIG MAIN POWER SWITCH.
(3) After turn on the PC and MONITOR, execute the

‘Certificate Downloader v1.4’ from the screen.

6-2. Adjustment Sequence

(1) After open the ‘Certificate Downloader v1.4’, enter

Connection set and set the as same below.
The port settings are determined by each PC's setup.

Connecting to MPLAB ICD 2
...Connected
Setting Vdd source to MPLAB ICD 2
Target Device PIC18F242 found, revision = 0x7
...Reading ICD Product ID
Running ICD Self Test
...Passed
MPLAB ICD 2 Ready

- 12 -

ADJUSTMENT INSTRUCTIONS

(2) Select ‘Connection’ and SET connected to RS-232C.
(3) After clicking "Enter", confirm that "Enter Password:"

appears.

(4) Click the "OpenFile - Download" button from CP Data

Download, ‘select the Private Key’ appears and click
ENTER.

(5) After clicking ENTER, the ‘opens Private key' window

appears and select the Private key applied to the SET.
The Private Key file name is on the Label of the Digital
Board.

(6) When the Dialog window appears, click OK and the write

work will begin.

(7) When completed, click ‘CP Data Download: OK’

[ When ‘CP Data Download: OK’ does not appear, certificate

has not Download correctly.
SET is rebooted and certificate Download work must be
repeated.

(8) Now, you may begin IEEE1394 (DTCP) Download work.

Select the “DTCP.dat” file by pressing the ‘DTCP File
Open’ button.

- 13 -

ADJUSTMENT INSTRUCTIONS

(9) After opening the ‘DTCP.dat’ file, confirm the key list in the

DTCP Key List window.

(10) Select the desired item of DTCP key List.

When pressing ‘DTCP key writing’ button, the Progress
window will appear.

(11) When completed, “DTCP key Download: OK" will display

in the Terminal window and the SET will reboot
automatically.

[ When process (11) malfunctions, it is not Download.

DTCP Download process start again from (8).

7. Gemstar Operation Confirmation

7-1. Required Test Equipment

(1) PC with Factory Test Program
(2) G-LINK-To-PC Card (Serial GLINK(CN1202))
(3) VBI Inserter (Norpak TES3) - Guide Data Discharge

Equipment

[ In case of without the VBI Inserter(TES3), a VCR may be

used.

7-2. Preparation for Adjustments

(1) In case of with VBI Inserter(TES3): Signal uses Cable

input and set as below.

(2) In case of without VBI Inserter(TES3): VCR uses Cable

input and set as below.

[ Factory Test S/W must be set to "GlinkTo PC Card" ON.

7-3. Adjustment Confirmation Work

(1) Turn on the TV and run Factory Test Program of PC.

[ Program only needs to run once, regardless of set quantity.

(2) Enter the EZ adjust menu by pressing Adjust on the

Service Remote Control (S R/C).
(3) Go to number 1 Gemstar and press Enter.
(4) TV set screen will appear as shown.

Input Signal