Table of Contents
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SERVICE MANUAL
This service manual is for the 6620LCT and
Rating Label (Example: 6620LCT)
6620LG version A models, which are different
from the 6620LCT and 6620LG non-A version
models.
For 6620LCT and 6620LG version A models, a
suffix "A" is printed on the rating label on the
back of the unit. Refer to the rating label
Suffix "A"
illustration at right.
20" COLOR LCD TELEVISION
6620LCT/6620LG
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Table of Contents
Related Manuals for Sylvania 6620LG A
Summarization of Contents
IMPORTANT SAFETY NOTICE
LCD TV Circuit Safety Precautions
General safety guidelines for servicing LCD TVs, covering protective devices and openings.
Design Alteration Warning
Warns against altering the TV's mechanical or electrical design, which could create hazards.
Hot Chassis Servicing Precautions
Details precautions for chassis connected to the AC power line, requiring isolation transformers.
Product Safety Component Notice
Highlights parts with special safety characteristics and the risks of using substitutes.
General Servicing Precautions
Lists specific safety measures during servicing, including part replacements and wiring.
SPECIFICATIONS
Tuner Specifications
Technical specifications for the TV's tuner section, including input levels and frequencies.
LCD Panel Specifications
Technical specifications for the LCD panel, such as pixel count, brightness, and viewing angle.
Video Specifications
Technical specifications related to the video processing and display, like overscan and color temperature.
Audio Specifications
Technical specifications for the audio output, including power, distortion, and frequency response.
Safety Check after Servicing
Clearance Distance Verification
Verifies specified clearance distances between components and metallic parts for safety compliance.
Leakage Current Testing
Measures leakage current to exposed parts to ensure it's below the specified limit for user safety.
STANDARD NOTES FOR SERVICING
Circuit Board Component Identification
Explains common symbols and markings used on circuit boards for identification.
Flat Pack-IC Removal and Installation
Provides detailed procedures for safely removing and installing flat-pack integrated circuits.
Instructions for Handling Semi-conductors
Human Body Grounding
Emphasizes using a grounding band to prevent electrostatic discharge from the body.
Workbench Grounding
Details grounding procedures for the workbench to protect semiconductors from static electricity.
CABINET DISASSEMBLY INSTRUCTIONS
Cabinet Disassembly Flowchart
Provides a visual flowchart outlining the steps for disassembling cabinet parts.
Disassembly Method Details
Details the methods for removing or unhooking specific parts during cabinet disassembly.
ELECTRICAL ADJUSTMENT INSTRUCTIONS
Service Mode Entry and Operation
Explains how to enter and operate the TV's service mode for adjustments.
Initial Data Setting
Details the procedure for setting initial data values in the service mode.
Flicker Adjustment Procedure
Guides on adjusting the screen flicker by modifying VCOM settings via the service remote.
White Balance Adjustment
Describes how to adjust white balance for accurate red, green, and blue beam mixing.
BLOCK DIAGRAMS
System Control Block Diagram
Illustrates the main control flow and interconnections of the TV's system.
IF/Video Signal Block Diagram
Shows the signal path and components involved in the IF and Video processing.
Audio Signal Block Diagram
Depicts the audio signal processing path and related components.
LCD Signal Block Diagram
Illustrates the signal processing for the LCD display unit.
Power Supply Block Diagram
Shows the architecture and components of the TV's power supply unit.
LCD Backlight Block Diagram
Details the operation and control of the LCD backlight system.
SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS
Standard Schematic Notes
Provides general notes on interpreting schematic diagrams and component identification.
Component Symbol Definitions
Explains the schematic symbols used for capacitors and transistors.
LIST OF CAUTIONS AND SYMBOLS IN SCHEMATICS
Fuse Replacement Caution
Highlights cautions regarding fuse replacement for fire risk prevention.
Power Supply Circuit Caution
Warns about potential component failure if checks are not performed before AC connection.
Schematic Voltage Indications
Explains how voltage values are indicated on schematic diagrams.
Reading Converged Lines
Describes the method for reading and interpreting converged lines in schematics.
Test Point Symbol Explanations
Explains the symbols used to denote test points on PCBs in schematic diagrams.
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