Lg 50pa4500 User manual

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Internal Use OnlyInternal Use Only

CHASSIS : PB23ACHASSIS : PB23A

MODEL : MODEL :

50P50P

A4500A4500

50PA4500-DM50PA4500-DM

MODEL :MODEL :

50PA451050PA4510

50PA4510-DJ50PA4510-DJ

CAUTIONCAUTION

BEFORE SERVICING THE CHASSIS,BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

PLASMA TVPLASMA TV

SERVICE MANUALSERVICE MANUAL

CONTENTSCONTENTS

CONTENTS CONTENTS

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SAFETY PRECSAFETY PREC

AUTIONS AUTIONS

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SPECIFICASPECIFICA

TION TION

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........... ...........

ADJUSTMENADJUSTMEN

T T

INSTRUCINSTRUC

TION ..............................TION ..............................

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BLOCK DIAGRAMBLOCK DIAGRAM

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...... ......

1212

EXPLODED VIEW EXPLODED VIEW

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...... ......

1313

SCHEMASCHEMA

TIC TIC

CIRCUIT CIRCUIT

DIAGRAM DIAGRAM

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Many elMany el

ectrical ectrical

and mechanicand mechanic

al parts al parts

in this in this

chassis chassis

have spechave spec

ial safetyial safety

-related -related

characteristics. characteristics.

These These

parts arparts ar

e identified e identified

by by

in thein the

Schematic Diagram and Schematic Diagram and

Exploded View.Exploded View.

It is essential that these special safety parts should be replaced with the same components as recommended in this manual to preventIt is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent

Shock, Fire, or other Hazards.Shock, Fire, or other Hazards.

Do not modify the original design Do not modify the original design

without permission of manufacturer.without permission of manufacturer.

General GuidanceGeneral Guidance

AnAn

isolation Transformer should always be usedisolation Transformer should always be used

during theduring the

servicing of a receiver whose chassis is not isolated from the ACservicing of a receiver whose chassis is not isolated from the AC

power line. Use a transformer of adequate power rating as thispower line. Use a transformer of adequate power rating as this

protects the technician from accidents resulting in personal injuryprotects the technician from accidents resulting in personal injury

from electrical shocks.from electrical shocks.

It will also protect the receiver and it's components from beingIt will also protect the receiver and it's components from being

damaged by accidental shorts of the circuitry that may bedamaged by accidental shorts of the circuitry that may be

inadvertently introduced during the inadvertently introduced during the

service operation.service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown,If any fuse (or Fusible Resistor) in this TV receiver is blown,

replace it with the specified.replace it with the specified.

When replacing a high When replacing a high

wattage resistor (Oxide Metal Film Resistor,wattage resistor (Oxide Metal Film Resistor,

over 1 W), keep the over 1 W), keep the

resistor 10 mm away from PCB.resistor 10 mm away from PCB.

Keep wires away from high voltage or Keep wires away from high voltage or

high temperature parts.high temperature parts.

Before returning the receiver to the Before returning the receiver to the

customer,customer,

Leakage Current Hot CheckLeakage Current Hot Check

(See below Figure)(See below Figure)

Plug the AC cord directly into the AC outlet.Plug the AC cord directly into the AC outlet.

Do not use a Do not use a

line Isolation Transformline Isolation Transform

er during this check.er during this check.

Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitorConnect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor

between a known good earth ground (Water Pipe, Conduit, etc.)between a known good earth ground (Water Pipe, Conduit, etc.)

and the exposed metallic parts.and the exposed metallic parts.

Measure the AC voltage across the resistor using AC voltmeterMeasure the AC voltage across the resistor using AC voltmeter

with 1000 ohms/volt with 1000 ohms/volt

or more sensitivity.or more sensitivity.

Reverse plug the AC cord into Reverse plug the AC cord into

the AC outlet and repeat AC voltagethe AC outlet and repeat AC voltage

measurements for each exposed metallic part. Any voltagemeasurements for each exposed metallic part. Any voltage

measured must not exceed 0.75 volt RMS which is corresponds tomeasured must not exceed 0.75 volt RMS which is corresponds to

0.5 mA.0.5 mA.

In case any measurement is out of the limits specified, there isIn case any measurement is out of the limits specified, there is

possibility of shock hazard and the set must be checked andpossibility of shock hazard and the set must be checked and

repaired before it is returned to repaired before it is returned to

the customer.the customer.

Leakage Current Hot Check circuitLeakage Current Hot Check circuit

IMPORTANT SAFETY NOTICEIMPORTANT SAFETY NOTICE

AC Volt-meterAC Volt-meter

SAFETY PRECAUTIONSSAFETY PRECAUTIONS

SPECIFICATIONSPECIFICATION

NOTE : Specifications and others are subject to NOTE : Specifications and others are subject to

change without notice for improvementchange without notice for improvement

1. Application range1. Application range

This spec sheet is applied all of the PDP TV with PB23A chassis.This spec sheet is applied all of the PDP TV with PB23A chassis.

2. Requirement for Test2. Requirement for Test

Each part is tested as below without special appointment.Each part is tested as below without special appointment.

(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C

(2) Relative Humidity: 65 % ± 10 %(2) Relative Humidity: 65 % ± 10 %

(3) Power Voltage(3) Power Voltage

: Standard input voltage (AC 100-240 V~, 50/60 Hz): Standard input voltage (AC 100-240 V~, 50/60 Hz)

* Standard Voltage of each products is marked by models.* Standard Voltage of each products is marked by models.

(4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with(4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with

BOM.BOM.

(5) The receiver must be operated for about 5 minutes prior to the adjustment.(5) The receiver must be operated for about 5 minutes prior to the adjustment.

3. Test method3. Test method