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LG CF-20F30K User Manual

LG CF-20F30K
27 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 : RE-21FB50RX
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
Feb.,2003
Printed in KoreaP/NO : 3828VD0126Q
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LG CF-20F30K Specifications

General IconGeneral
BrandLG
ModelCF-20F30K
CategoryTV
LanguageEnglish

Summary

Safety Precautions

General Safety Guidance

Covers isolation transformer, X-ray protection, and AC leakage current checks for safe operation.

Servicing Precautions and Procedures

General Servicing Guidelines

Covers unplugging, voltage testing, cleaning, and general rules before servicing.

Handling Electrostatically Sensitive Devices

Procedures for safely handling components sensitive to static electricity.

Component Removal and Replacement

Guides for removing and replacing ICs, transistors, diodes, fuses, and resistors.

Circuit Board Foil Repair

Techniques for repairing damaged copper patterns on circuit boards.

Product Specifications

Video and Intermediate Frequency Specs

Details video input systems and intermediate frequencies for the TV.

Tuning Range and System Specifications

Covers tuning bands for TV and CATV, and tuning system details.

Antenna, OSD, and Audio Specifications

Details antenna input impedance, OSD, and audio output specifications.

External Connections and Features

Lists external connection types and product features like Auto Programme.

Control Descriptions

Remote Control Handset Functions

Explains the functions of buttons on the remote control handset.

Remote Control Setup

Remote Control Battery Installation

Instructions for installing batteries in the remote handset.

Front Panel Controls and Indicators

Front Panel Button Functions

Describes the functions of the buttons on the TV's front panel.

Front Panel Indicator and Sockets

Describes the power indicator and various input/output sockets.

Disassembly Instructions

Important Notes for Disassembly

Covers isolation transformer requirement and chassis removal.

Back Cabinet and CPT Removal

Step-by-step guide to removing the back cabinet and picture tube.

Adjustment Procedures

CDL Data Adjustment

Adjusting CDL data using service mode for specific models.

Option Data Adjustment

Adjusting various option settings via service mode (Option-1, Option-2).

Picture Adjustment

Focus and Screen Voltage Adjustment

Adjusting picture focus and screen voltage using FBT controls.

White Balance and AGC Adjustment

Adjusting white balance and automatic gain control (AGC).

Deflection Adjustment

Deflection Data Setup

Initial setup and data for deflection adjustments in SVC mode.

Vertical and Horizontal Deflection Adjustments

Procedures for VL, VA, SC, VS, and HS deflection adjustments.

Purity and Convergence Adjustment

Purity Adjustment Procedure

Steps for adjusting purity using magnets and yoke.

Convergence Adjustment Procedure

Steps for adjusting convergence using magnets and yoke.

Block Diagram

System Block Diagram

Visual representation of the TV's internal circuitry and signal flow.

Exploded View

Component Exploded Diagram

Diagram showing the physical layout of major components.

Exploded View Parts List

Part Number and Description List

List of components with location numbers, part numbers, and descriptions.

Replacement Parts List

Component Part Numbers

Detailed list of replacement parts including ICs, diodes, transistors, and capacitors.

SVC Sheet

Service Sheet Information

Contains the service sheet number and related reference information.

Troubleshooting Guide

Raster and Picture Issues

Diagnosing and resolving problems related to no raster or picture.

Audio and Sound Issues

Diagnosing and resolving mono, stereo, and other sound-related problems.

Diagrams and Schematics

Printed Circuit Board and Wiring Diagram

Visual layout of the PCB and internal wiring for reference.

Schematic Diagram of MC-019A

Detailed schematic of the TV's electronic circuits.

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