LG RU-42PX11-H, RU-42PX10-C User Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : RF-043A

MODEL : RU-42PX10/C RU-42PX11/H

CANADA : http//biz.lgservice.com USA : http//www.lgservice.com

: http//lgservice.com/techsup.html

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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 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 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 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 1-800-243-0000

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

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

SPECIFICATIONS.................................................................7

ADJUSTMENT INSTRUCTIONS ..........................................8

TROUBLE SHOOTING GUIDE...........................................12

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

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

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

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

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

PRINTED CIRCUIT BOARD ...................................................

TABLE OF CONTENTS

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Controls

ON/OFF

TV/VIDEO

VOL CH

ON/OFF Button

- This is a simplified representation of front panel. Here shown may be somewhat different from your TV.

- This manual explains the features available on the RU-42PX10 TVs.

Front Panel Controls

Remote Control Sensor

VOLUME (

FF,GG

) Buttons

Power Standby Indicator

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

CHANNEL (EE, DD) Buttons

MENU Button

TV/VIDEO Button

DESCRIPTION OF CONTROLS

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Connection Options

RGB INPUT

Antenna

AUDIO INPUT

DVI INPUT

S-VIDEO

REMOTE CONTROL

AC INPUT

AUDIOVIDEO

COMPONENT

INPUT 2

COMPONENT

INPUT 1

MONITOR

OUTPUT

A/V

INPUT 1

R L

AUDIO VIDEO

RS-232C INPUT

(CONTROL/SERVICE)

L/MONO

S-VIDEO VIDEO

L / MONO

AUDIO

A/V INPUT2

Antenna Input

Connect cable or antenna signals to the TV, either directly or through your cable box.

RGB Input/Audio Input/DVI Input

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

Audio/Video Input 1

Connect audio/video output from an external

device to these jacks.

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 S-Video out from an S-VIDEO device to the S-VIDEO input.

Power Cord Socket

This TV operates on AC power. The voltage is indicated

on the Specifications page. Never attempt to operate

the TV on DC power.

RS-232C INPUT (CONTROL/SERVICE) PORT

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

S-VIDEO Input

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

VIDEO Input

Connects the video signal from a video device.

AUDIO Input

Use to connect to hear stereo sound from an external device.

DESCRIPTION OF CONTROLS

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

POWERMUTE

TV/VIDEO

MULTIMEDIA

MTS

CAPTION

VOL

ENTER

1 2 3

4 5 6

7 8 9

VOL

ARC

FCR

PIP/DW

APC DASP

REVIEW

SPLIT ZOOM

PIP CH +

SLEEP

PIP CH -

PIP INPUTWIN.SIZE

SWAP

MEMORY/ERASE

A.PROGPOSITION

MUTE

Switches the sound on or off.

TVVIDEO

Selects: TV, Video 1-2, Component

1-2, RGB, and DVI input sources.

MULTIMEDIA

Selects: Component 1-2, RGB, and

DVI input sources.

CAPTION

Selects CAPTION mode.

VOLUME UP/DOWN

Increases/decreases the sound level.

CHANNEL UP/DOWN

Selects available channels found with

Auto program.

ENTER

Accepts your selection or displays the

current mode.

POWER

Turns your TV on or off.

MTS

Selects the MTS sound:

Mono, Stereo, or

SAP.

Brings up the main menu to the screen.

REVIEW

Tunes to the last channel viewed.

NUMBER buttons

ARC

Changes the picture format.

PIP INPUT

Selects the input source for the sub picture.

SWAP

Exchanges the main/sub images.

PIP/DW

Switches between PIP and Twin

picture modes.

PIPCH-/PIPCH+

Changes to next lower/higher PIP channel.

POSITION

Moves the sub picture in pip mode.

SLEEP

Sets the sleep timer.

FCR

Use to scroll the favorite channel list.

MEMORY/ERASE

Memorizes or erases selected channel.

A.PROG (AUTO PROGRAM)

Searches for available channels.

SPLIT ZOOM

Enlarges the picture with regular ration.

Remote Control Key Functions

WIN. SIZE

Adjusts the sub picture size.

APC

Adjusts the factory preset picture according

to the room.

DASP

Selects the sound appropriate for the program's character.

DESCRIPTION OF CONTROLS

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

MODELS

RU-42PX10/20

48.4 / 1210

27.6 / 701

11.4 / 290 66 / 22.9

852 x 480 (Dot)

AC100-240V, 50/60Hz

NTSC

VHF 2 ~ 13, UHF 14 ~ 69, CATV 1 ~ 125

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)

RU-50PX10/20

56 / 1400

30.4 / 761.5

11.4 / 290 66 / 29.9

1366 x 768 (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

SPECIFICATIONS

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ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions apply to the RF-043A 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), a after image may be occur in the black level part of the screen

3. Channel memory

3-1. Setting up the G-prove

(1) Install the GProve. (GProve4.4.0.2.exe)

(2) After installing the Gprobe, [Option -> Connection Setup]

or click the icon indicated in the picture and then setup as below the picture. (In case of the port (second one), set to the serial port of the connected PC. The other only have to be set as below the picture.)

(3) After finishing inputs, click the button [OK] to complete the

connection setup.

3-2. Confirming the G-prove

(1) Connect Rs232 cable and then turn on the power.

If communication is correct, the message is showed like in the left output terminal.

(2) If the message is not showed, push the [INSTART] button

of the adjust remocon twice, and change the right selection of the [System Control -> RS-232 Host] from GProbe to PC. ** If it is impossible to check the OSD, push the [TILT]

button of the adjust remocon. Then, the message which is “Starting Gprove...” comes up. From this time, communication is operated correctly. However, you have to push the [TILT] button again in case of turning on Main Power.

** If you want to check again whether commnunication is

on or not, input “test” and push the Enter key on the right input terminal. If communication is on, the message of “Test passed.” will come up

3-3. Channel memory method

(1) Click [Command -> Batch]. (2) When the window of [Batch] is showed, enter the text file

(Ch_Memory-RZ_PX10.txt) in the right blank of the File.

(3) Click the button [OK] to write CH information in the

EEPROM.

(4) It means the completion of the CH memory download that

the message of right output terminal is showed as below.

(Fig 2)

(Fig 1)

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ADJUSTMENT INSTRUCTIONS

4. HDCP download

4-1. Setting up & Confirming the G-prove

: Refer to 3-1 and 3-2.

4-2. HDCP download method

(1) Click [Command -> NVRAM Write] (2) When the window of [NVRAM Write] is showed, select

“LGEKEY1.bin” to insert fill up in the File. (3) LGEKEY1 : first KEY value (4) Address : insert ‘0’ (5) After finishing inputs, click the button [OK] to write HDCP

key in the EEPROM. (6) It means the end of the HDCP key download that the

message of Output terminal is showed as below.

5. POWER PCB Assy Voltage Adjustments

(Va, Vs Voltage Adjustments)

5-1. Test Equipment :D.M.M. 1EA

5-2. Connection Diagram for Measuring

Refer to Fig 5.

5-3. Adjustment Method for

P/No. 3501V00180A 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 P805, connect

- terminal to GND pin of P805.

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

(2) Vs Adjustment

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

< 3501V00180A >

< 3501V00182A >

(Fig 5) Connection Diagram of power adjustment for measuring

(Fig 4)

(Fig 3)

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

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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)

5-4. Adjustment Method for

P/No. 3501V00182A 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 P805, connect

- terminal to GND pin of P805.

3) After turning RV601, voltage of D.M.M adjustment as same as Va voltage which on lable of panel right/top (Deviation; ±0.5V)

(2) Vs Adjustment

1) Connect + terminal of D.M.M to Vs pin of P805, 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)

6. Adjustment of White Balance

6-1. Required Equipment

Color Analyzer (CA-100 or same product)

6-2. Connection Diagram of Equipment for

Measuring

6-3. 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) Supply Gray Pattern (216 Level Full Size Pattern) signal

to VIDEO input. (AV2 Input 60Hz) (Refer to Fig. 6)

(3) To adjust, stick sensor to 216 Gray Level Pattern, press

ADJ key twice(White Balance) on remote control. For adjustment and

D, E on reomte control for adjustment

mode to select Red Gain and Blue Gain, press VOL +, Key and adjust it until color coordination becomes as below.

X; 0.283±0.003, Y; 0.297±0.003 Color Temperature; 9,300°K±500°K

(4) Exit adjustment mode using

A Key.

7. Auto RGB Color Balance

7-1. Pattern Equipment

PC Pattern Generator (VG828, VG854, 801GF, MSP3240A) (16 Gray Scale Pattrtn output(RGB output Level: 0.7Vp-p)

7-2. Method of Auto RGB Color Balance

(1) Input RGB Source : 16 Gray Scale Pattern output (RGB

output Level : 0.7Vp-p) (2) Press ADJ KEY on R/C for adjustment. (3) Press Vol. + KEY and operate To SET. (4) Auto-RGB OK means completed adjustment.

8. Auto Component Color Balance

8-1. Pattern Equipment

MSP3240A or same product (16 Gray Scale Pattern output(Component output Level:

0.7Vp-p)

8-2. Method of Auto RGB Color Balance

(1) Input RGB Source : Component 480p/576p 16 Gray Scale

Pattern

At this time, except Pb and Pr signal, only Y signal insert. (2) Press ADJ KEY on R/C for adjustment. (3) Press Vol. + KEY and operate To set. (4) Auto-RGB OK means completed adjustment.

Window

MSPG-2100 or MSTG-5200

AV Signal Input

Full Size Pattern

216 Gray Level

RS-232C Serial Communication

60Hz

(Fig 6) White Balance Adjustment

ADJUSTMENT INSTRUCTIONS

(Fig 7) Auto RGB/ Component Color Balance Test Pattern

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ADJUSTMENT INSTRUCTIONS

9. Auto Adjustment Map(RS-232C)

10. DDC Data Input

10-1. Required Test Equipment

(1) A jig for adjusting PC, DDC (PC serial to D-sub

Connection equipment) (2) S/W for writing DDC (EDID Data Write & Read) (3) D-sub 15P Cable, D-Sub to DVI Connector (Connect to

DVI Jack)

10-2. Setting of Device

10-3. Preparation for Adjustment

(1) Set devices as above and turn the PC, jig on. (2) Put S/W for writing DDC (EDID data Write & Read) into

operation. (operated in DOS mode.)

10-4. Sequence of Adjustment

(1) DDC Data Input for Analog-RGB

1) Put the set on the table and turn the power on.

2) Connect PC Serial to D-sub 15P Cable of jig for DDC adjustment to RGB terminal (D-Sub 15Pin).

3) Operate S/W for DDC record and select DDC data for Analog RGB in Model Menu.

4) Operate EDID Write command.

5) Operate EDID Read command and check whether Check Sum is 53.

6) If Check Sum is not 53, repeat 3) ~ 4).

7) If Check Sum is 53, DDC data for Analog-RGB input is completed.

(2) DDC Data input for Digital-RGB(DVI)

1) Connect PC Serial to DVI Cable of jig for DDC adjustment to DVI terminal (DVI Jack).

2) Operate S/W for DDC record and select DDC data for digital RGB in model menu.

3) Operate EDID Write command.

4) Operate EDID Read command and check whether Check sum is D2(1page), BF(2page).

5) If Check sum is not D2(1page), BF(2page), repeat 3) ~

4).

6) If Check sum is D2(1page), BF(2page), DDC data for Analog-RGB input is completed.

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

RF-043A

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)

RS232

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TROUBLE SHOOTING GUIDE

1. Power Board

1-1. The whole flowchart which it follows in voltage output state

Start check

Manufacture enterprise

meaning of a passage

1. Check the Power Off condition.

Doesn't the

screen whole come

out?

It is identical

with Power Off

condition?

Yes

2. Check the Interface signal condition.

Is the Interface

signal operated?

Yes

3. Check the St-by 5V signal circuit.

Doesn't the

low pressure output

come out?

Doesn't the

St-by 5V signal

come out?

Yes

4. Check the 5V Monitor signal circuit.

Doesn't the

5V Monitor signal

come out?

Yes

7. Check the VSC Vs-ON signal

Doesn't the

high tension output

come out?

Doesn't the

VSC signal Vs-ON

come out?

Yes

High tension

output voltage Drop

it occurs?

When

remove the

Y B/D Module

Input Connector, output

voltage Drop

it occurs?

When remove

the Y, Z B/D Module

Input Connector, Power

Board high tension output

voltage Drop

it occurs?

Yes No No

9. Check the Power Board Output high

tension circuit

Yes

10. Check the Z B/D

Module Coutput circuit

Yes

When

remove the

Z B/D Module

Input Connector, output

voltage Drop

it occurs?

11. Check the Y B/D

Module Coutput circuit

Yes

8. Check the Vs, Va

voltage output circuit.

Doesn't the

Vs, Va voltage output

come out?

Yes

5. Check the VSC RL-ON signal.

Doesn't the

VSC signal RL-ON

come out?

Yes

6. Check the VSC low pressure output

Doesn't the

VSC low pressure

output come out?

Yes

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TROUBLE SHOOTING GUIDE

1-2. Sony Power Board Structure

T502: Vs Trans T702: Va Trans T101: St-by Trans T103: Low Voltage Trans

1 2 3

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