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Philips 20PT6245/37 User Manual

Philips 20PT6245/37
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Philips Consumer Electronics
Technical Service Data
Service and Quality
Service Publications Dept.
One Philips Drive
P.O. Box 14810
Knoxville, TN 37914
REFER TO SAFETY GUIDELINES
SAFETY NOTICE: ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE
HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS
TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING
© Philips Electronics North America Corporation Visit our World Wide Web Site at http://www.forceonline.com
Manual 7646
Model no.: 20PT6245/37
First Publish: 04-21-2005
Rev. Date: 05-18-2005
Print Date: 1/20/2006
Pg. SCHEMATIC DIAGRAMS AND PC BOARDS
1. Chassis Overview
2. A1 - Power Supply Schematic
3. A2 - Deflection Schematic
4. A3 - Tuner IF Schematic
5. A4 - Video Processing Schematic
6. A5 - Audio Processing (Stereo + SAP) Schematic
7. A6 - Audio Amplifier + Mono Sound Processing Schematic
8. A7 - Font I/O + Front Control + Headphone
9. A8 - Rear I/O Schematic
10. A9 - DVD Power Supply Schematic (Optional)
11. B1 - CRT Panel Schematic
12. Layout Mono Carrier: (Top Side)
13. Layout Mono Carrier (Overview Bottom Side)
14. Layout CRT Panel (Top Side)
15. Layout CRT Panel (Bottom Side)
16. Side Jack Panel Schematic
17. Layout Side Jack Panel
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Philips 20PT6245/37 Specifications

General IconGeneral
Screen Size20 inches
Display TechnologyCRT
Aspect Ratio4:3
TunerAnalog
Audio OutputMono
ConnectivityRF input
Input PortsRF input, Composite video input

Summary

Schematic Diagrams and PC Boards

Chassis Overview

Provides a general overview of the television chassis layout and major sections.

A1 - Power Supply Schematic

Detailed schematic diagram for the power supply section of the TV.

A2 Deflection Schematic

Detailed schematic diagram for the deflection circuitry of the TV.

A3 - Tuner IF Schematic

Detailed schematic diagram for the tuner and intermediate frequency (IF) stages.

A4 - Video Processing Schematic

Detailed schematic diagram for the video signal processing circuits.

A5 - Audio Processing (Stereo + SAP) Schematic

Detailed schematic diagram for stereo and SAP audio processing.

A6 - Audio Amplifier + Mono Sound Processing Schematic

Detailed schematic diagram for the mono audio amplifier and sound processing.

A7 - Font I/O + Front Control + Headphone

Schematic for front input/output, control panel, and headphone jack.

A8 - Rear I/O Schematic

Schematic diagram detailing the rear input/output connections.

A9 - DVD Power Supply Schematic (Optional)

Schematic for the optional DVD power supply module.

B1 CRT Panel Schematic

Detailed schematic diagram for the Cathode Ray Tube (CRT) panel.

Layout Mono Carrier: (Top Side)

Top side component layout diagram for the mono carrier board.

Layout Mono Carrier (Overview Bottom Side)

Bottom side overview layout diagram for the mono carrier board.

Layout CRT Panel (Top Side)

Top side component layout diagram for the CRT panel.

Layout CRT Panel (Bottom Side)

Bottom side component layout diagram for the CRT panel.

Side Jack Panel Schematic

Schematic diagram for the side jack panel connections.

Layout Side Jack Panel

Component layout diagram for the side jack panel.

GENERAL SAFETY NOTES

IMPORTANT SAFETY NOTICE

Critical information regarding safe service operations and potential hazards.

WARNING

Highlights critical components with special safety characteristics and potential hazards.

SAFETY CHECKS

Mandatory safety checks to be performed after service to ensure safe operation.

PARTS REPLACEMENT

FIRE AND SHOCK HAZARD

Safety considerations related to fire and electrical shock during servicing.

IMPLOSION

Safety precautions regarding the picture tube implosion protection system.

X-RADIATION

Safety measures to prevent exposure to X-radiation from the picture tube.

LEAKAGE CURRENT CHECKS

LEAKAGE CURRENT COLD CHECK

Procedure for performing a cold leakage current test on the chassis.

LEAKAGE CURRENT HOT CHECK

Procedure for performing a hot leakage current test on the chassis.

PRECAUTIONS DURING SERVICE

Crimp Type Wire Connector

Procedure and safety notes for using crimp type wire connectors.

SAFETY CHECK AFTER SERVICING

Clearance Distance

Ensuring correct clearance distances for safety after component replacement.

LEAKAGE CURRENT CHECKS

Performing final leakage current tests to verify safety standards.

PREVENTION OF ELECTROSTATIC DISCHARGE (ESD)

MECHANICAL INSTRUCTIONS

Rear Cover Removal

Step-by-step guide for removing the rear cover of the unit.

Service Position Main Panel

Instructions for placing the main panel in a service position.

Rear Cover Mounting

Procedure for correctly mounting the rear cover after service.

TROUBLESHOOTING

TEST POINTS

SERVICE MODES

Service Default Alignment Mode (SDAM)

Detailed explanation of the SDAM mode and its functions.

How to Enter SDAM

Instructions on how to access the Service Default Alignment Mode.

PROBLEM SOLVING TIPS

Picture Problems

Guidance on resolving common picture quality issues through settings.

Sound Problems

Guidance on resolving common sound issues through settings.

REPAIR TIPS

ELECTRICAL ADJUSTMENTS

ALIGNMENTS

General Alignment Conditions

Prerequisites and conditions for performing alignments.

Hardware Alignments

Procedures for hardware-specific alignment adjustments.

Software Alignments and Settings

Detailed software-based alignments and settings for optimal performance.

9.3 AUDIO

9.3.1 Processing

Description of the audio signal processing stages.

9.3.2 Amplifier

Details on the audio amplifier circuit and its operation.

9.3.3 AVL (Automatic Volume Limiting)

Explanation of the Automatic Volume Limiting function.

9.3.4 Mute

Information on the mute function and its conditions.

9.4 VIDEO

9.5 SYNCHRONIZATION

9.6 DEFLECTION

9.7 POWER SUPPLY

9.7.1 Introduction

Overview of the switching mode power supply (SMPS) design.

9.7.2 Derived Voltages

Details on the various voltages supplied by the power supply unit.

9.8 CONTROL

9.8.1 I2C-Bus

Explanation of the Inter-Integrated Circuit (I2C) bus communication.

9.8.2 User Interface

Description of the user interface functions and controls.

9.8.3 I/O Selection

Control mechanisms for input and output signal selection.

9.8.4 Power Supply Control

How the microprocessor controls the power supply unit.

9.8.5 Protection Events

Overview of protection mechanisms managed by the microprocessor.

9.9 ABBREVIATION LIST

PARTS LIST

CHASSIS OVERVIEW

B1 CRT PANEL

Physical location and identification of the CRT panel.

SIDE JACK PANEL

Physical location and identification of the side jack panel.

TOP CONTROL PANEL

Physical location and identification of the top control panel.

FRONT INTERFACE PANEL

Physical location and identification of the front interface panel.

POWER SUPPLY A1

Physical location and identification of the power supply module (A1).

LINE DEFLECTION A2

Physical location and identification of the line deflection module (A2).

TUNER IF A3

Physical location and identification of the tuner and IF module (A3).

VIDEO PROCESSING A4

Physical location and identification of the video processing module (A4).

MAIN CHASSIS PANEL

Physical location and identification of the main chassis panel.

AUDIO PROCESSING (STEREO+SAP) A5

Physical location and identification of the audio processing module (A5).

AUDIO AMP + MONO SOUND PROC. A6

Physical location and identification of the audio amplifier (A6).

FRONT I/O + FRONT CONTROL + HEADPHONE A7

Location of front I/O, control, and headphone connections (A7).

REAR I/O CINCH A8

Physical location and identification of the rear I/O cinch connections (A8).

DVD POWER SUPPLY A9

Physical location and identification of the optional DVD power supply (A9).

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