LG 42PM1M-MA Schematic

PLASMA MONITOR

SERVICE MANUAL

CAUTION

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

CHASSIS : RF-052A

MODEL : 42PM1M/MA

42PM1M/MA-ZA

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 BOARD ..............................................................................24

BLOCK DIAGRAM.............................................................................................26

EXPLODED VIEW..............................................................................................28

EXPLODED VIEW PARTS LIST........................................................................29

REPLACEMENT PARTS LIST...........................................................................30

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

POWERMUTE

INPUT

MULTIMEDIA

ARC

VOL

1 2 3

4 5 6

PSM

SSM

8 9

VOL

SPLIT ZOOM

SLEEP

REVEAL

MODE

MIXSIZE

UPDATE

TIME

Q.VIEW

HOLD

INDEX

I/II

TEXT/

LIST/

MULTIMEDIA

selects the Component, RGB or DVI

modes.

POWER

switches the set on from standby or off to standby.

ARC

changes the picture format.

displays on screen menus one by one. exits the current menu. memorizes menu changes.

SSM

to select the sound appropriate to your viewing programme character.

NUMBER buttons

SLEEP

sets the sleep timer.

I/II (option) selects the language during dual language broadcast. selects the sound output.

TEXT/*(option)

These buttons are used for teletext. For further details, see the ‘Teletext’ section.

COLOURED BUTTONS :

These buttons are used for teletext.

LIST (option)

displays the programme table.

INPUT

MUTE

switches the sound on or off.

DD/ EE

Selects a menu option.

FF/ GG

(Volume Up/Down)

Increases/decreases sound level.

Adjusts menu settings.

accepts your selection or displays the

current mode.

PSM

adjusts the factory preset picture

according to the room.

SPLIT ZOOM

enlarge the screen with regular

ration.

Q.VIEW (option)

Returns to the previously viewed

programme.

Note : This function works only when

Favourite prog.

is set to

Off

Otherwise each press of this button

will select a stored favorite

programme.

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DESCRIPTION OF CONTROLS

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ON/OFF

VOL

INPUT SELECT

ON/OFF

1. Main Power Button

2. Remote Control Sensor

3. Power Standby Indicator

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

4. INPUT SELECT Button

5. MENU

Displays on screen menus one by one. Exits the current menu. Memorizes menu changes.

DD/ EE

Selects a menu option.

FF/ GG

(Volume Up/Down)

Increases/decreases sound level. Adjusts menu settings.

2 3 4 5 6

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AC INPUT

AUDIO INPUT RGB INPUT

RGB OUTPUT

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE

CONTROL

S-VIDEO

YPBP

VIDEO

VARIABLE AUDIO OUT

AUDIO

EXTERNAL SPEAKER

HDMI/ DVI(VIDEO)

AUDIO

AUDIO VIDEO

COMPONENT INPUT 2 COMPONENT INPUT 1

MONITOR OUPUT

A/V INPUT

(MONO) (MONO)

Connection to PC

Connection to AV equipment

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AS mark

LG TV

Owner’s Manual

1.5V

Alkaline batteries

Power Cord

POWERMUTE

INPUT

MULTIMEDIA

ARC

VOL

1 2 3

4 5 6

PSM

SSM

8 9

VOL

SPLIT ZOOM

SLEEP

REVEAL

MODE

MIXSIZE

UPDATE

TIME

Q.VIEW

HOLD

INDEX

I/II

TEXT/

LIST/

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 buying these items.

Optional Extras

Tilt wall mounting bracket

404250 40 42 50

Video cables

Audio cables

Ceiling mounting bracket

Desktop stand

Speakers

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 PDP TV used RF-052A 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.

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: IEC60065 EMI : CISPR13

V General Specification

1. Module Specification

Remark

PDP

LGE SPEC

Maker : SONY/ LGIT/ Sanken

Specification 42 inch wide Color Display Module 16:9 PDP42X3xxxx, RGB Closed Type

1) Temp : 0~40 deg

2) Humidity : 0~85%

1) Temp : -20~60 deg

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

1 2 3

Item Display Screen Device Aspect Ratio PDP Module

Operating Environment

Storage Environment

Input Voltage

2. Model Specification

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Item Market Broadcasting system Available Channel

Receiving system Video Input (1EA) SCART (2EA) S-Video Input (1EA) Component Input (1EA) RGB Input RGB Output HDMI Input Audio Input (3EA) Audio Input (1EA) Audio Output (2EA)

Wired Control

1 2 3

4 5 6 7 8

9 10 11 12

Specification EU PAL B/G/I/D/K, SECAM L/L’

BAND PAL NTSC

VHF E2~E12 2~13 UHF E21~E69 14~69

CATV S1~S20 1~125

HYPER S1~S41 Upper Heterodyne PAL, SECAM, NTSC PAL, SECAM PAL, SECAM, NTSC Y/Cb/Cr, Y/Pb/Pr RGB-PC, RGB-DTV RGB-PC, RGB-DTV HDMI-PC, HDMI-DTV PC Audio, Component (1EA), AV(1EA) PC Audio Variable Audio out (1EA) External audio out (1EA) Discrete IR

Remark

Except 42PM1MB, 50PM1MB, 42PM3MVB Except 42PM1MB, 50PM1MB, 42PM3MVB Except 42PM1MB, 50PM1MB, 42PM3MVB

42PM1M/MA, 50PM1M/MA, 42PM3MV/MVA 42PM1MB, 50PM1MB, 42PM3MVB

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ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions is applied all of the PDP TV, RF-052A 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) 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].

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. 2-1)

(Fig. 2-2)

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4. POWER PCB Assy Voltage Adjustments

(Va, Vs Voltage Adjustments)

4-1. Test Equipment :D.M.M. 1EA 4-2.Connection Diagram for Measuring

: refer to fig.3

4-3. Adjustment Method

[P/No 3501V00221A 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 label 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)

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

5-1. 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

5-2. Setting of device

5-3. Preparation for Adjustment

1) As above Fig. 5, 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

5-4. Sequence of Adjustment

(1) DDC data of Analog-RGB

1) Init the data

2) Load the EDID data.(Open File)

[Analog-RGB : MF056A_RGB.ANA] [digital(HDMI) : MF056A_DMI.DVI]

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.

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

Va ADJ

RV601

P806

P805

P807

GND

NC VS

DMM + -

P804

P801

P802

Vs ADJ RV401

P803

(Fig. 3) Connection diagram of power adjustment for measuring

(Fig. 4) Connection Diagram of DDC download

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6. Auto AV(CVBS) Color Balance

6-1. Requirement

- This AV color balance adjustment should be performed before white Balance Adjustment

6-2. 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 Fig6)

6-3. Method of Auto AV(CVBS) Color Balance

1) Input the PAL Composite Video (Fig6. 100% Color Bar

Pattern) into video input.

(RCA : AV1, SCART : AV3 Input, PAL : 50Hz, NTSC : 60Hz)

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.

7. Adjustment of White Balance

7-1. 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

7-2. Connecting diagram of equipment for

measuring (For Auto Adjustment)

W Auto adjustment Map(RS-232C)

7-3. 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.8, Supply 216Level (85 IRE) full screen pattern to Video input. (RCA : AV1, SCART, AV3 Input, PAL : 50Hz, NTSC: 60Hz)

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.

(Fig. 6) Auto AV(CVBS) Color Balance Test Pattern

216 Level (85 IRE)

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-052A/B/C

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)

(Fig. 7) Connection Diagram of Auto W/B Adjustment

MSPG-2100 / MSTG-5200

216 Level (85 IRE)

COLOR ANALYZER TYPE ; CA-100

CVBS signal input

RS-232C Serial Communication

(Fig.5) EDID DATA

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