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LG CT-21Q41KE - User Manual

LG CT-21Q41KE
28 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 :
CT-21Q41KE/KEX/42KEX
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
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Summary

Safety Precautions

General Safety & X-RAY Radiation

Covers isolation transformers, HV handling, X-RAY sources, and HV meter usage.

AC Leakage Current Checks

Details procedures for performing cold and hot AC leakage current checks to ensure safety.

Servicing Precautions

General Servicing Practices

Lists essential safety practices for servicing, such as disconnecting power and handling components.

ESD & Soldering Guidelines

Covers handling sensitive devices and best practices for soldering techniques and materials.

Component Handling Procedures

Details methods for removing, replacing, and repairing components and circuit board foils.

Specifications

Remote Control Operation

Key Functions Overview

Details the operation of primary remote control buttons like Power, Menu, Volume, and Channel.

Special Feature Buttons

Explains buttons for Mute, TV/AV, Sleep, SSM, Surround, and Teletext.

Battery Installation

Instructions for correctly installing batteries in the remote control handset.

Front Panel and Side Panel Controls

Key Front Panel Buttons

Describes the main power, menu, OK, navigation, and mode selection buttons on the front panel.

Input;Output Ports

Details the AV input sockets, headphone jack, and Eye function sensor.

Disassembly Instructions

Chassis and Cabinet Removal

Procedures for removing the chassis assembly and the back cabinet from the TV.

Picture Tube (CPT) Removal

Steps for safely removing the CPT board and the picture tube itself.

Picture Tube Handling Caution

Emphasizes extreme care when handling the picture tube due to vacuum and fragility.

Adjustment Procedures

Safety and Equipment Requirements

Covers safety measures and necessary tools for performing adjustments.

CDL Data Adjustment

Procedure for adjusting CDL data using SVC-0 mode and specific tables.

Option Data Adjustment

Steps for adjusting option data (OPTION-1, OPTION-2) using SVC mode.

Video Adjustment Procedures

Focus and Screen Voltage Adjustment

Procedures for adjusting focus and screen voltage for optimal picture.

White Balance and AGC Adjustment

Steps for adjusting white balance and automatic gain control for picture stability.

Deflection Adjustment

Setup and Data Procedures

Covers preparation, initial setup data, and the overall adjustment process.

Vertical Adjustments (VL, VA, VS)

Adjusts vertical linearity, amplitude, and shift for optimal picture geometry.

Horizontal and S-Correction Adjustments (HS, SC)

Adjusts horizontal shift and vertical S-correction for picture geometry.

Purity and Convergence Adjustment

Purity Adjustment Steps

Procedures for adjusting screen purity using magnets and degaussing coil.

Convergence Adjustment Steps

Detailed steps for aligning red, green, and blue beams for accurate picture convergence.

Block Diagram

Exploded View

Exploded View Parts List

Replacement Parts List - ICs, Transistors, Diodes

Replacement Parts List - Capacitors, Fuses, Coils

Replacement Parts List - Transformers, Resistors

Replacement Parts List - Additional Resistors

Replacement Parts List - Switches, Filters, Crystals, Accessories

LG CT-21Q41KE Specifications

General IconGeneral
Display TechnologyCRT
Screen Size21 inches
Aspect Ratio4:3
Power SourceAC 110-240V, 50/60Hz
Input PortsAV, RF
Audio OutputMono/Stereo

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