LG RT-50PZ70, RT-50PZ60, RF-03OB Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : RF-03OB

MODEL : RT-50PZ60/70

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 ........................................................................9

PRINTED CIRCUIT BOARD ..............................................................................12

BLOCK DIAGRAM.............................................................................................18

EXPLODED VIEW..............................................................................................20

EXPLODED VIEW PARTS LIST........................................................................21

REPLACEMENT PARTS LIST...........................................................................22

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

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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

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DESCRIPTION OF CONTROLS

123 456

789

DVD

STB

AUDIO

MODE

POWER

MUTE

TV/AV

MULTIMEDIA

ARC

SSM

Q.VIEW

PSM

FAVOURITE

PIP PR-

PIP ARC

LIST

PLAY

REW FF SKIP

PAUSE STOP

RECORD

ZOOM- ZOOM+

SPLIT ZOOM

SLEEP

I/II

WIN.SIZE

WIN.POSITION

PIP INPUT

PIP PR+ SWAP

PIP/DW TEXT

EXIT

VOL

CABLE

VCR

Displays the selected device.

TV/AV

Selects the TV, AV, Component, RGB

or DVI modes.

MODE

Selects another device.

NUMBER buttons

PIP/DW

Switches the sub picture on or off.

Selects PIP or DW modes.

PIP PR + /-

Selects a program 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.

WIN.POSITION

Moves the sub picture to

DD/ EE

or FF/

direction.

PIP ARC

Changes the picture format for the

sub picture.

accepts your selection or displays the current mode.

DD/ EE

or FF/

Adjusts menu settings. Selects menu item.

POWER

switches the set on from standby or off to standby.

ARC

Changes the picture format.

MUTE

Switches the sound on or off.

Q.VIEW

Returns to the previously viewed programme.

SSM

To select the sound appropriate to your viewing programme character.

VOL +/- (Volume Up/Down)

Increases/decreases sound level.

PR +/- (Programme Up/Down)

selects a programme.

EXIT

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

DVD BUTTONS

Controls a LG DVD player.

SLEEP

Sets the sleep timer. I/II

Selects the language during dual language broadcast. Selects the sound output.

ZOOM+ / ZOOM-

Enlarges or reduces the main picture size.

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.

MULTIMEDIA

Selects the Component, RGB or DVI

modes.

FAVOURITE

selects a favorite programme.

PSM

Adjusts the factory preset picture

according to the room.

Displays on screen menus one by one.

Exits the current menu.

Memorizes menu changes.

VCR BUTTONS

Controls a LG video cassette

recorder.

LIST

Displays the program table.

SPLIT ZOOM

Enlarge the screen with regular

ration.

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AUDIO/VIDEO IN SOCKETS S-VIDEO/AUDIO IN SOCKETS

Remote Control Sensor

3. Main Power Button

4. TV/AV Button

Selects the TV, AV, Component, RGB or DVI modes.If OSD is displayed, selects menu item.

5. MENU Button

FF/ GG

(Volume Up/Down) Buttons

7.DD/EE(Programme Up/Down) Buttons

8. Power Standby Indicator

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

ON/OFFS-VIDEO VIDEO AUDIO

L/MONO

AV4

TV/AV

VOL

S-VIDEO VIDEO AUDIO

L/MONO

AV4

TV/AV

VOL

ON/OFF

- Shown is a simplified representation of the set.

- Here shown may be somewhat different from your set.

1 2 3 4

5 6 7 8

1 23 4 5 6 7 8

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Location and Function of Controls

Antenna

RGB INPUT DVI INPUT

AV1

AUDIO INPUT

AV2

COMPONENT

AV3

Y P

(MONO)

AUDIO S-VIDEOVIDEO

RS-232C INPUT

EXTERNAL SPEAKER

R L

CONTROL

REMOTE

(CONTROL/SERVICE)

AC INPUT

1. ANTENNA INPUT

2. RGB INPUT / AUDIO INPUT / DVI INPUT

Connect the monitor output socket of the PERSONAL COMPUTER to this socket.

3. EURO SCART SOCKET

Connect the euro scart socket of the VCR to these sockets.

4. COMPONENT INPUT

AUDIO/VIDEO IN SOCKETS (AV3)

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 AV3.

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

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

6. CONTROL LOCK / REMOTE CONTROL

7. EXTERNAL SPEAKER OUTPUT (8 ohms)

Connect to optional external speaker(s). * For further information, refer to ‘Speaker & Speaker Stand’ manual.

1 2 3 4 5 6 7

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D-sub 15 pin cable

AS mark

LG TV

Owner’s Manual

1.5V

Alkaline batteries

Power Cord

1 2 3 4 5 6 7 8 9

DVD

STB AUDIO

MODE

POWER

MUTE

TV/AV

MULTIMEDIA

ARC

SSM

Q.VIEW

PSM

FAVOURITE

PIP PR-

PIP ARC

LIST

PLAY

REW FF SKIP

PAUSE STOP

RECORD

ZOOM- ZOOM+

SPLIT ZOOM

SLEEP

I/II

WIN.SIZE

WIN.POSITION

PIP INPUT

PIP PR+ SWAP

PIP/DW TEXT

EXIT

VOL

CABLE

VCR

Remote Control handset

DVI-D Cable

Accessories

- 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

Phone scart cable (Optional)

Tilt wall mounting bracket

Video cables Audio cables

Desktop stand

Wall mounting bracket Ceiling mounting bracket

Speakers

Desktop Speaker stand

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SPECIFICATIONS

NOTE : Specifications and others are subject to change without notice for improvement

V Scope

This specification can be applied to all model of 50”PDP TV related to RF-03OB Chassis.

V Test Condition

1) Temperature : 25±5°C (77±9°F)

2) Relative Humidity: 65±10%

3) Power Voltage:Standard Input Voltage (AC 110V-240V~, 50/60Hz) But Standard input voltage mark value is marked by model.

4) Follow each drawing or spec for spec and performance of parts,based upon P/N of RPL

Warm up set for more than 20min before the

measurement.

V Test and Inspection Method

1) Performance : Follow the Standard of LG TV test

2) Extra standards

Safety: Follow the standard of CE, IEC EMC : Follow the standard of CE, IEC

Remark Safety : IEC60065, IEC60095 EMI : EN55013 EMS : EN55020 Safety : IEC60065, IEC60095 EMI : EN55013

Model Name

RZ-42PZ70

RT-42PZ70

Market

N-EU

Chassis

RF-03OA

Model Name RZ-50PZ60/70 RT-50PZ60/70

Market Place

N-EU

Brand

LG LG

1. Application Object

These instructions are applied to all of the PDP monitor/ Tuner , RF-03OB chassis.

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 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 220V, 60Hz in

adjusting. (5) The receiver must be operated for about 15 minutes prior

to the adjustment.

¤ After receiving 100% white pattern, the receiver must be

operate prior to adjustment.(Or white condition in HEATRUN mode)

¤ŁEnter into HEAT-RUN mode

- Select the HEAT-RUN OFF by pressing ADJ Key on Remote Control for adjustment.

- Press the VOL + Key in HEAT-RUN OFF.

(OSD display HEAT-RUN WHITE and screen display 100% FULL WHITE PATTERN)

[ Set is activated HEAT-RUN without signal generator in

this mode.

[ Single color pattern of HEAT-RUN mode uses to check

PANEL.(RED/BLUE/GREEN)

If you turn on a still screen more than 20 minutes, a afterimage may be occur in the black level part of the screen.

3. Board Adjustment Method

(1) Input the power to VSC board. (2) Connect the PC for channel memory work to VSC board

whit RS-232C.

(3) Execute the program for channel memory that fit each

BOM

- Method to execute program for channel memory

¤ Click the “CHANNEL(RF03OA_B).EXE” to execution. ¤ŁSelect the setting PORT of PC in”SELECT PORT” and

then click the “SELECT PORT”.

¤ØClick the “DOWN LOAD TO E2PROM” ¤ŒClick the “OPEN“ in FILE NAME ¤ºClick a suitable data on BOM. ¤ºClick the “ENTER” ¤ Show the channel memory. ¤ When the channel memory is finished, divide the RS-

232C CABLE in VSC BOARD.

¤ In case VSC BOARD of same BOM, connect the RS-

232C CABLE and then repeat ¤º~¤ by same method.

4. RGB Auto Cut-Off & MIN Bia Adjustment

(1) Input Full White (255 Gray) signal which generated from

Pattern Generator into RGB1 Input part.

(2) Press POWER ON KEY on R/C for adjustment and select

AUTO-CUT(Cut-off Auto Adjustment) (3) Press Vol. + key and operate TO SET (4) Screen adjustment starts with Full Black screen.

Original Full White screen will be presented about 3-5

seconds later. And if there is a mark of OK OSD, then the

Auto Cut-off and Min-Bias adjustment will be completed. (5) Pass to the next MAX Bias Adjustment after Adjustment.

O You can check whether circuit adjustment is operated well or

not, as below.

(1) Display RGB to the Main picture, AV to the Sub picture in

the TWIN PICTURE. (2) To check the MIN-Bias, input Full Black (0 gray) signal into

AV and RGB input part at the same time in the Pattern

Generator. (3) To check the MAX-Bias, input Full White (255 gray) signal

into AV and RGB input part at the same time in the Pattern

Generator. (4) Compare Black Level with White Level by eyes. And if

there is no Level difference, the adjustment is completed

well.

O Data value, which adjusted in the board, is valid until the VSC

Board is disuse and must be protected. For the protection of data, Micom does not permit any more adjustment after completion.

O In case of re-adjustment, operate First Value Setting.

5. POWER PCB Assy Voltage Adjustment (Va, Vs, Voltage Adjustment)

5-1. Test Equipment

: D.M.M 1EA

5-2. Connection Diagram for Measuring

: refer to<fig 1>

5-3. Adjustment Method

(1) Va Adjustment

¤ After receiving 100% white pattern, HEAT RUN. ¤Ł Connect + terminal of D.M.M to Va pin of P805 and

connect – terminal to GND pin of P805.

¤Ø After turning the VR351, voltage of D.M.M adjustment

as same as Va voltage which on label of panel Right/Top. (Deviation : ±0.5V)

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ADJUSTMENT INSTRUCTIONS

Each PCB Assy must be checked by the Check JIG Set before whole assembly. (Be careful the POWER PCB Assy not to damage to PDP Module)

(2) Vs Adjustment

¤ Connect + terminal of D.M.M to Vs pin of P805 and

connect – terminal to GND pin of P805.

¤Ł After turning the VR551, voltage of D.M.M adjustment

as same as Vs voltage which on label of panel Right/Top. (Deviation : ±0.5V)

(3) 5.2V Adjustment

¤ Connect + terminal of D.M.M to 5V pin of P804 and

connect – terminal to GND pin of P804.

¤Ł Turning VR251, adjust the volt value to 5.2v value.

6. Adjustment of White Balance

6-1. Required Equipment

Color analyzer (CA-100 or same product)

6-2. Connection Diagram of Equipment for

Measuring (Manual Adjustment)

: refer to <fig 2>,<fig 3>

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 minute.

(2) Supply 70Gray, 216Gray Level, 100% size length and

breadth signal to AV input. (Refer to <fig 2>,<fig 3>) RZ-50PZ60/70 : AV3, RT-50PZ60/70 : AV1

(3) White balance is adjusted from Low Light to High Light,

And pushing the V key, save the adjustment value.

(4) LOW Light, stick sensor to 70Gray Pattern and then press

ADJ Key on R/C for adjustment and press

D, E on R/C in

adjustment mode to select R-L or G-L, press VOL +, - Key and adjust it until color coordination becomes as below.

[RZ-50PZ60/70, RT-50PZ60/70] X: 0.285±0.003, Y: 0.285±0.003 Color temperature: 9,700°K±500°K

(5) High Light, stick sensor to 216Gray Pattern and then press

ADJ Key on R/C for adjustment and press

D, E on R/C in

adjustment mode to select R-H or G-H, press VOL +, - Key and adjust it until color coordination becomes as below.

[RZ-42PZ70, RT-42PZ70] X: 0.285±0.003, Y: 0.285±0.003 Color temperature: 9,700°K±500°K

(6) Exit adjustment mode using V Key.

Map for Auto adjustment (RS-232C)

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Va ADJ

VR351

Vs ADJ

VR551

CN 804

P805

P804

P803

P802

P801

Va GND GND

GND

Va ADJ

VR251

<Fig 1> Connection Diagram for Measuring of Power Adjustment

Typ

Baud Rate

1150200

Index

R-L G-L

R-H G-H

Data bit

Cmd1 Cmd2

j j j k

j a j b

Stop bit1Parity

NONE

RF-03OB_PDP50

Protocol

Setting

Data Min Value

54(36) 54(36)

180(B4) 170(A4)

Max Value

90(5A) 85(FA)

254(FE) 250(FA)

RS232

R-L 70 R-L 70 G-L 70 G-L 70 R-M 128 R-M 128 G-M 128 G-M 128 R-H 216 R-H 216 G-H 216 G-H 216

Window

MSPG-2100 or MSTG-5200

RGB Signal Input

High Light adjustment

70 Gray Level

<Fig 2> Low Light(Connection Diagram of Manual Adjustment)

R-L 70 R-L 70 G-L 70 G-L 70 R-M 128 R-M 128 G-M 128 G-M 128 R-H 216 R-H 216 G-H 216 G-H 216

Window

MSPG-2100 or MSTG-5200

RGB Signal Input

High Light adjustment

216 Gray Level

<Fig 3> High Light (Connection Diagram of Manual Adjustment)

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8. Adjustment of Component Off-Set

8-1. Required Test Equipment

: HD-STB(SK-010T) or same product

8-2. Manual Adjustment of Component Off-

Set

(1) Input Video signal and Component 720P,1080i signal of

HD-STB. (2) Press ADJ key of R/C twice for entering twin picture mode. (3) Adjust the same color senses between main and sub,

using Volume +; -key of R/C in R, G, B Off-Set menu.

9. DDC Data input

9-1. 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)

9-2. Setting of Device

9-3. 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.)

9-4. Sequence of Adjustment

(1) DDC Data Input for Analog-RGB

¤ Put the set on the table and turn the power on.

¤ŁConnect PC Serial to D-sub 15P Cable of JIG for DDC

Adjustment to RGB terminal (D-Sub 15Pin).

¤Ø Operate S/W for DDC record and select DDC Data for

Analog RGB in Model Menu.

¤Œ Operate EDID Write command.

¤º Operate EDID Read command and check whether

Check Sum is OK.

¤ If Check Sum is NG, repeat ¤Ø~ ¤Œ.

¤ If Check Sum is OK, DDC Data for Analog-RGB input is

completed.

(2) DDC Data input for Digital-RGB

¤ Connect PC Serial to DVI Cable of JIG for DDC

Adjustment to RGB2 terminal (DVI Jack).

¤Ł Operate S/W for DDC record and select DDC Data for

Digital RGB in Model Menu.

¤ØOperate EDID Write command.

¤Œ Operate EDID Read command and check whether

Check Sum is OK.

¤ºIf Check Sum is NG, repeat ¤Ø~ ¤Œ. ¤ If Check Sum is OK, DDC Data for Digital-RGB input is

completed.

* If you change the Booster 0 to 1 in a fringe area, a

user ca set to Booster “On”.

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MAIN (TOP)

PRINTED CIRCUIT BOARD

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