LG MU-50PZ41V/B Schematic

PLASMA MONITOR

SERVICE MANUAL

CAUTION

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

CHASSIS : RF-02KE

MODEL : MU-50PZ41V MU-50PZ41VB

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

CONTENTS

SAFETY PRECAUTIONS ...................................................................................3

DISCRIPTION OF CONTROLS ......................................................................... 4

ADJUSTMENT INSTRUCTIONS ........................................................................6

BLOCK DIAGRAM...............................................................................................9

EXPLODED VIEW..............................................................................................10

EXPLODED VIEW PARTS LIST ........................................................................11

REPLACEMENT PARTS LIST...........................................................................12

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

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

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

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

CONTROLS DESCRIPTION

Monitor Controls

Connection Options

VOL. MENU INPUT SELECT

ON/OFF

Main Power Button

INPUT SELECT Button

VOLUME (FF,GG) Buttons

Power Standby Indicator

Illuminates red in standby mode,

Illuminates green when the

Monitor is turned on

Remote Control Sensor

MENU Button

DD,EE

Buttons

Y PBP

( )( )

(MONO)

AUDIO

ON/ OFF

AUDIO

( )( )

AC INPUT

(8Ω)

EXTERNAL SPEAKER

COMPONENT

(DVD/DTV INPUT)

RGB1 OUTPUT

(PC/DTV OUTPUT)

LOCK

REMOTE

CONTROL

RGB1 INPUT

(PC/DTV INPUT)

INPUT

AUDIO

INPUT

AUDIO

INPUT

AUDIO

INPUT

VIDEO

RGB2 INPUT

(DIGITAL RGB INPUT)

RS-232C INPUT

(CONTROL/SERVICE)

S-VIDEO

EXTERNAL SPEAKER

1 2 3 4 7 85 6 1

1. EXTERNAL SPEAKER (8 ohm output)

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

manual.

2. POWER CORD SOCKET

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

3. AUDIO/VIDEO INPUT JACKS

Connect audio/video out from external equipment to these jacks.

S-VIDEO INPUTS (S-VIDEO)

Connect video out from an S-VIDEO VCR to the S-VIDEO input.

4. COMPONENT(DVD/DTV INPUT)/AUDIO INPUT JACKS

5. CONTROL LOCK Switch REMOTE CONTROL

When “CONTROLLOCK” is set “ON”, Monitor is operated by the external control device.

6. RGB1 OUTPUT(PC/DTV OUTPUT) JACKS

You can watch the RGB1 signal on another monitor, connect RGB1 OUTPUT (PC/DTV OUTPUT) to another monitor’s PC input port.

7. AUDIO INPUT/RGB1 INPUT(PC/DTV INPUT)/ RGB2 INPUT(DIGITAL RGB INPUT) JACKS

Connect the monitor output socket of the PC to this socket.

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

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

Front Panel Controls

Back Connection Panel

Remote Control Key Functions

- When using the remote control aim it at the remote control sensor of the Monitor.

- There's maybe a defect in consecutive operation of remote control in specified brightness according to this monitor feature.

1 2 3

4 5 6

7 8

POWER

SLEEP INPUT SELECT

APC DASP

ARC PIP ARC

PIP

TWIN PICTURE

SWAP

MENU MUTE

VOL

POWER STOP

PLAY FF

REC

REW

P/STILL

WIN.SIZE

WIN.POSITION

ZOOM +

ZOOM -

SPLIT ZOOM

VOL

SUB INPUT

POWER

Switches the Monitor on from

standby or off to standby.

SLEEP

Sets the sleep timer.

APC

Adjusts the factory preset picture

according to the room.

ARC

Changes the picture format.

PIP

Switches the sub picture on or off.

SWAP

Exchanges main and sub picture

images.

Displays on screen menus one by one.

Exits the current menu.

Memorizes menu changes.

NUMBER buttons

WIN. SIZE

Adjusts the sub picture size.

WIN.POSITION

Moves the sub picture.

SPLIT ZOOM

Enlarge the screen with regular

ration.

ZOOM-/ZOOM+

Enlarges or reduces

the main picture size.

VCR BUTTONS

Controls a LG video cassette recorder.

DD / EE

Selects a menu option.

FF / GG

(Volume button)

Increases/decreases sound level. Adjusts menu settings.

INPUT SELECT

Selects:

VIDEO, S-VIDEO, RGB1/2 or

COMPONENT mode.

DASP

To select the sound appropriate to your viewing program character:

FLAT,SPORTS, CINEMA,MUSIC, or USER

PIP ARC

Changes the PIP picture format.

SUB INPUT

Selects the input mode for the sub picture.

MUTE

Switches the sound on or off.

TWIN PICTURE

1. Application Object

These instructions are applied to all of the PDP monitor, RF02CA.

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 110~240V,

50/60Hz in adjusting. (5) The receiver must be operated for about 15 minutes prior

to the adjustment.

1) After receiving 100% white pattern(06CH), the receiver must be operate prior to adjustment. (Or white condition in HEAT-RUN mode)

2) Enter into HEAT-RUN mode

- Press the POWER ON KEY on R/C for adjustment.

- 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)

[Caution]

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

3. RGB Auto Cut-Off & MIN Bias Adjustment

(1) Input Full Back (0 Gray) signal which generated from

Pattern Generator into CVBS and 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 Window screen will be presented about 5-6

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.

[ Replace PDP Module or Power Board, adjust certainly Power

PCB Assy Voltage.

4. MAX Bias Adjustment

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

Pattern Generator into CVBS and RGB1 Input part.

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

MAX-BIAS (3) Press Vol. + key and operate TO SET (4) Original Full White screen will be presented about 1~2

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

Min-Bias adjustment will be completed. (5) After adjustment, press

key to save adjustment and

come out of the adjustment mode.

You can check whether circuit adjustment is operated well or not, as below.

(1) Display RGB1 to the Main picture, CVBS to the Sub

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

CVBS and RGB1 input part at the same time in the Pattern

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

into CVBS and RGB1 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.

Data value, which adjusted in the board, is valid until the VSC Board is dissued and must be protected. For the protection of data, Micom does not permit any more adjustment after completion.

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

Each PCB Assy must be checked by Check JIG Set before assembly. (Especially, be careful Power PCB Assy which can cause fatal Damage to PDP Module.)

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

1) After receiving 100% white pattern, HEAT RUN.

2) Connect + terminal of D.M.M to Va pin of P805 and connect – terminal to GND pin of P805.

3) After turning the VR4, voltage of D.M.M adjustment as same as Va voltage which on label of panel Right/Top. (Deviation : ±0.5V)

ADJUSTMENT INSTRUCTIONS

(2) Vs adjustment

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

2) After turning the VR1, voltage of D.M.M adjustment as same as Vs 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

(Manual Adjustment)

6-3. Adjustment of White Balance

Operate the Zero-calibration of the CA-100, then stick sensor

to PDP module surface when you adjust.

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 216Gray, 128Gray, 70Gray Level, 50% size length

and breadth signal to RGB1 input. (Refer to Fig 2,3,4)

(3) W/B adjustment must be adjusted once and follow the

sequence of Low Light --> Middle Light --> High Light and then save the adjustment value with

o Key.

(4) To adjust Low Light , stick sensor to Gray Level(or 20~25

Cd/m2) Pattern, press ADJ Key on R/C for adjustment and press v, x 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. X: 0.290±0.003, Y: 0.300±0.003, Color temperature: 8, 500°K±500°K

(5) To adjust Middle Light , stick sensor to Gray Level(or 70~75

Cd/m2) Pattern, press ADJ Key on R/C for adjustment and press v, x on R/C in adjustment mode to select R-M or G-M, press VOL +, - Key and adjust it until color coordination becomes as below. X: 0.290±0.003, Y: 0.300±0.003 Color temperature: 8, 500°K±500°K

DMM

VR1

VR4

Va voltage adjustment

variable resistor

P806

GND GND Va NC Vs Vs

P805

Vs voltage adjustment

variable resistor

<Fig 1> Connection Diagram of Power Adjustment for Measuring

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

Window

MSPG-2100 or MSTG-5200

COLOR

ANALYZER

TYPE;CA-100

High Light

216 Gray Level

135~140Cd/

RGB Signal Input

PDP MONITOR

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

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

Window

MSPG-2100 or MSTG-5200

COLOR

ANALYZER

TYPE;CA-100

Middle Light

128 Gray Level

70~75Cd/

RGB Signal Input

PDP MONITOR

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

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

Window

MSPG-2100 or MSTG-5200

COLOR

ANALYZER

TYPE;CA-100

Low Light

70 Gray Level

20~25Cd/

RGB Signal Input

PDP MONITOR

<Fig 4> Connection Diagram of Manual Adjustment(Low Light)

(6) To adjust High Light, stick sensor to Gray Level(or 135-140

(7) Exit adjustment mode using o Key.

7. DDC Data Input

7-1. 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)

7-2. Setting of Device

7-3. 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.)

7-4. 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 RGB1 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 OK.

6) If Check Sum is NG, repeat 3) ~ 4).

7) If Check Sum is OK, DDC Data for Analog-RGB input is completed.

(2) DDC Data input for Digital-RGB

1) Connect PC Serial to DVI Cable of JIG for DDC Adjustment to RGB2 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 OK.

5) If Check Sum is NG, repeat 3) ~ 4).

6) If Check Sum is OK, DDC Data for Digital-RGB input is completed.

8. Component Off-Set adjustment

Input the signal to HD-STB(SK-010T) and receive 14Ch.

8-1. Required Equipment

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

8-2. Manual Adjustment of Off-Set

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

HD-STB into AV1 and Component input part.

(2) Select Twin Picture by pressing ADJ twice on R/C, check

component in the main picture and AV1 in the sub picture.

(3) Adjust the R-OFFSET, B-OFFSET color impression of

component(Main picture) and external Input(Sub picture) same by pressing Volume +,- key.

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