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LG 21SA1RG User Manual

LG 21SA1RG
18 pages
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COLOR TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : CW81B
MODEL : 21SA1RL/RG/RLX
MODEL :
21SA1RL/RG/RLX-L4
North/ Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Aug., 2009
Printed in ChinaP/NO : MFL42466416
Internal Use Only
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LG 21SA1RG Specifications

General IconGeneral
BrandLG
Model21SA1RG
CategoryTV
LanguageEnglish

Summary

Safety Precautions

General Safety Checks and Warnings

Covers initial safety checks, lead dress, component inspection, and general warnings before servicing.

High Voltage and X-Radiation Safety

Focuses on picture tube related safety, X-radiation limits, and proper installation.

Specific Component Safety Warnings

Addresses warnings for design alterations, picture tube implosion, and hot chassis.

Product Safety Notice

Highlights special safety characteristics of replacement parts to prevent hazards.

Adjustment Instructions

AGC Voltage Adjustment

Adjusts the Automatic Gain Control voltage for proper signal reception.

Screen Voltage Adjustment

Adjusts the screen voltage on the FBT for optimal picture display.

Purity and Convergence Adjustment

Corrects color purity and alignment of Red, Green, Blue lines on the picture tube.

White Balance Adjustment

Automatic White Balance Adjustment

Uses an auto meter to set color temperature and color balance.

Manual White Balance Adjustment

Adjusts color temperature and balance using manual controls.

Focus Voltage Adjustment

Focus Adjustment Procedure

Adjusts the focus control on the FBT for sharp picture lines.

Sub-Brightness Adjustment

Sub-Brightness Adjustment Procedure

Adjusts sub-brightness to make gray scale elements visible.

Deflection Setting Data Adjustment

Deflection Adjustment Preparation

Prepares for deflection adjustment using the remote control.

Deflection Adjustment Procedure

Adjusts horizontal and vertical position, and size of the picture.

Deflection Adjustment (21" Models)

Specific deflection adjustments for 21" Superslim and Ultra S/S models.

Troubleshooting

TV Functional Troubleshooting

Identifies troubleshooting areas within major TV functional blocks.

Tuner and IF Section Troubleshooting

Details troubleshooting for tuner input, control, and video/sound buffer sections.

Video Processing Troubleshooting

Covers troubleshooting for video/MICOM, tuner, receiver, IC, sound, RGB, and power supply.

SMPS Primary Section

SMPS Primary Power Components

Identifies components and potential issues in the SMPS primary power stage.

SMPS Secondary Section

SMPS Secondary Voltage Outputs

Details secondary voltage outputs and related components in the SMPS.

Vertical Section

Vertical IC and Related Circuits

Details the vertical IC (LA78141) and associated components for vertical output.

Horizontal Section

Horizontal Drive and Compensation

Covers horizontal drive, output, and compensation circuits.

Sound Processing Section

Audio Signal Path

Explains the signal flow from tuner to speaker via ICs.

CPT Drive Section

RGB Amplifier Circuitry

Describes the RGB amplifier circuit on the CPT board.

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