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LG CF-20 User Manual

LG CF-20
37 pages
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COLOR TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : MC-019A
MODEL :
CF-14/20/21D70K CF-14D10K
MODEL :
CF-20F60K CF-21F30K
MODEL :
CF-20/21S31KE/KEX
MODEL :
CF/CT-14/20/21K50KE/53KE
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
Jan.,2002
Printed in KoreaP/NO : 3828VD0104T
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LG CF-20 Specifications

General IconGeneral
BrandLG
ModelCF-20
CategoryTV
LanguageEnglish

Summary

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Key safety warnings and component identification for preventing hazards.

General Guidance

Essential servicing practices like using isolation transformers and handling components safely.

X-RAY Radiation Warning

Specific precautions and testing procedures related to X-ray radiation hazards.

Leakage Current Checks

Procedures for performing AC leakage current checks (cold and hot) to ensure safety.

SERVICING PRECAUTIONS

General Servicing Precautions

General rules for safe and correct servicing procedures, including power handling and connections.

Electrostatically Sensitive (ES) Devices

Guidelines for handling sensitive electronic components to prevent static damage.

General Soldering Guidelines

Techniques and best practices for soldering electronic components, including iron temperature and solder type.

SPECIFICATIONS

Video & Audio Specifications

Details on video input systems, intermediate frequencies, sound output, and external connections.

Tuning and Power Specifications

Information on tuning ranges, power requirements, and power consumption.

REMOTE CONTROL OPERATIONS

Remote Control Handset Functions

Detailed explanation of buttons on the remote control and their functions.

Battery Installation

Instructions for installing batteries in the remote control handset.

FRONT PANEL CONTROLS

Front Panel Button Functions

Explanation of the buttons and indicators on the TV's front panel.

DISASSEMBLY AND HANDLING

General Disassembly Notes

Important precautions and initial steps before disassembling the TV.

Chassis and Cabinet Removal

Procedures for removing the chassis assembly and back cabinet.

Picture Tube (CPT) Removal and Handling

Step-by-step guide for removing the picture tube and crucial handling safety.

ADJUSTMENT PROCEDURES

General Adjustment Safety & Equipment

Safety precautions and required test equipment for performing adjustments.

CDL Data Adjustment

Steps to adjust CDL data for optimal performance, referencing specific tables.

Option Data Adjustment

Process for adjusting option data (Option-1, Option-2) using specific tables.

Focus and Screen Voltage Adjustment

Procedures for adjusting focus and screen voltage using the FBT and oscilloscope.

White Balance Adjustment

Steps to perform white balance adjustment using a color analyzer and specific patterns.

Deflection Data Adjustment

Procedure for adjusting deflection data (VL, VA, SC, VS, HS) for screen geometry.

PURITY & CONVERGENCE ADJUSTMENT

Purity Adjustment Procedure

Detailed steps for adjusting picture purity using magnets and specific settings.

Convergence Adjustment Procedure

Steps to adjust color convergence using magnets and signals for optimal alignment.

BLOCK DIAGRAM

System Block Diagram

A comprehensive schematic showing the interconnections of major TV system components.

EXPLODED VIEWS AND PARTS

Exploded View & Parts List (14/20/21D70K)

Visual breakdown and component list for the 14/20/21D70K model.

Exploded View & Parts List (14D10K)

Visual breakdown and component list for the 14D10K model.

Exploded View & Parts List (20F60K)

Visual breakdown and component list for the 20F60K model.

Exploded View & Parts List (14/20/21K50KE/53KE)

Visual breakdown and component list for the 14/20/21K50KE/53KE models.

Exploded View & Parts List (21F30K)

Visual breakdown and component list for the 21F30K model.

Exploded View & Parts List (14/20/21S31KEX)

Visual breakdown and component list for the 14/20/21S31KEX model.

REPLACEMENT PARTS LIST

IC Components

List of integrated circuits (ICs) with part numbers and descriptions for replacement.

Diode & Transistor Components

Replacement parts list for diodes and transistors, including part numbers.

Capacitor Components

Comprehensive list of capacitors with part numbers and specifications.

Fuse, Coil, Transformer & Connector Parts

Replacement parts list for fuses, coils, transformers, and connectors.

Resistor Components

List of resistors with part numbers and values for replacement.

Resistors, Switches & Filters

Replacement parts list for resistors, switches, and filters.

Accessories & Miscellaneous Parts

List of accessories, miscellaneous items, and their part numbers.

SCHEMATIC DIAGRAM

System Schematic

Detailed circuit diagram of the MC-019A chassis.

PRINTED CIRCUIT BOARD & DIAGRAMS

Printed Circuit Board & Component Layout

Visual representation of the PCB layout and component placement.

Wiring Diagram

Diagram illustrating the internal wiring connections of the TV.

TROUBLESHOOTING GUIDE

Troubleshooting Flowcharts

Step-by-step diagnostic flowcharts for common TV issues.

SERVICE SHEETS

SVC Sheet 3854VA0083A-S

Specific service sheet for model 3854VA0083A-S, likely containing key service information.