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Philips 28PT4458/01 User Manual

Philips 28PT4458/01
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Published by BB 0466 Service PaCE Printed in the Netherlands Subject to modification EN 3122 785 14480
©
Copyright 2004 Philips Consumer Electronics B.V. Eindhoven, The Netherlands.
All rights reserved. No part of this publication may be reproduced, stored in a
retrieval system or transmitted, in any form or by any means, electronic,
mechanical, photocopying, or otherwise without the prior permission of Philips.
Colour Television Chassis
L04E
AA
E_14480_142.eps
260504
Contents Page Contents Page
1. Technical Specifications, Connections,
and Chassis Overview 2
2. Safety and Maintenance Instructions,
Warnings, and Notes 4
3. Directions for Use 6
4. Mechanical Instructions 7
5. Service Modes, Error Codes, and Faultfinding 9
6. Block Diagrams, Testpoint Overviews,
and Waveforms
Wiring Diagram 19
Block Diagram Supply and Deflection 20
Testpoint Overview Mono Carrier 21
Block Diagram Video 22
Testpoint Overview CRT, LTI & PIP Panel 23
Block Diagram Audio/Control 24
I2C and Supply Voltage Overview 25
7. Circuit Diagrams and PWB Layouts Diagram PWB
Power Supply (Diagram A1) 26 38-43
Diversity Table for A1 (Power Supply) 27 38-43
Deflection (Diagram A2) 28 38-43
Diversity Table for A2 (Deflection) 29 38-43
Tuner IF (Diagram A3) 30 38-43
Hercules (Diagram A4) 31 38-43
Features & Connectivities (Diagram A5) 32 38-43
Class D - Audio Amplifier (Diagram A6) 33 38-43
Audio Amplifier (Diagram A7) 34 38-43
Rear I/O Scart (Diagram A8) 35 38-43
Front Control (Diagram A9) 36 38-43
DVD Power Supply (Diagram A10)37 38-43
CRT Panel (Diagram B1) 44 46-47
ECO Scavem Panel (Diagram B2) 45 46-47
Side AV + HP Panel (PV2) (Diagram D) 48 49
Side AV + HP Panel (FL-13) (Diagram D) 50 51
Top Control Panel (PV2) (Diagram E) 52 52
Top Control Panel (FL-13) (Diagram E) 53 53
Power Supply PIP Panel (Diagram F1) 54 56-57
Tuner IF and Demodulator PIP (Diagram F2) 55 56-57
Linearity & Panorama Panel (Diagram G) 58 58
LTI/CTI Interface Panel (Diagram H) 59 60
Front Interface Panel (FL-13) (Diagram J) 61 61
Front Interface Panel (PV2) (Diagram J) 62 62
Front Interface and Keyb. Panel (Diagram J) 63 64
8. Alignments 65
9. Circuit Descriptions 73
Abbreviation List 82
IC Data Sheets 84
10 Spare Parts List 86
11 Revision List 90

Table of Contents

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Philips 28PT4458/01 Specifications

General IconGeneral
BrandPhilips
Model28PT4458/01
CategoryTV
LanguageEnglish

Summary

Technical Specifications, Connections, and Chassis Overview

Technical Specifications

Core technical details like display type, screen size, tuning system, and color systems.

Connections

Details side and rear connections for audio, video, and interface ports.

Chassis Overview

Overview of main printed circuit boards (PWBs) and their locations within the chassis.

Directions for Use

Directions for Use

Instructions on how to download user information from the Philips website.

Mechanical Instructions

Set Disassembly

Detailed steps for safely disassembling the television set, starting with rear cover removal.

Service Position

Instructions on how to place the mono carrier into its service position for maintenance.

Assies/Panels Removal

Procedures for removing front interface, side AV, and other assemblies from the chassis.

Set Re-assembly

Instructions for re-assembling the television set, emphasizing reverse order and final checks.

Service Modes, Error Codes, and Fault Finding

Test Points

Overview of test points on circuit board assemblies, referring to functional blocks and diagrams.

Service Modes

Explains Service Default Mode (SDM), Service Alignment Mode (SAM), and Customer Service Mode (CSM).

Service Default Mode (SDM)

Purpose, specifications, and entry method for Service Default Mode (SDM).

Service Alignment Mode (SAM)

Purpose, specifications, and entry method for Service Alignment Mode (SAM).

Customer Service Mode (CSM)

Purpose and entry method for Customer Service Mode (CSM) for call center interaction.

Problems and Solving Tips Related to CSM

Troubleshooting tips for common picture problems like brightness, sharpness, and color issues.

Picture Problems

Detailed steps to adjust brightness, sharpness, and color for picture quality issues.

ComPair

Introduction and specifications for ComPair, a hardware interface for PC-based faultfinding.

Error Codes

Explains how to read and clear the error code buffer, and lists error codes.

How To Read The Error Buffer

Methods to read the error buffer via SDAM, blinking LED, or ComPair.

How To Clear The Error Buffer

Procedures for clearing the error code buffer using SDAM or automatic reset.

The Blinking LED Procedure

Procedure to make error buffer contents visible via the front LED when no picture is present.

Protections

Explains error generation and protection modes, including blinking LED indication.

Fault Finding and Repair Tips

General tips and assumptions for fault finding and repair actions.

NVM Editor

How to directly change NVM contents using the NVM Editor in SAM mode.

Power Supply

Fault finding trees for 'Set not working' and 'Set does not start up' related to the power supply.

Deflection

Fault finding trees for 'One thin vertical line' and 'Blank screen' related to deflection issues.

Source Selection

Troubleshooting steps for issues with AV input or missing AV signals.

Tuner and IF

Troubleshooting guide for 'No Picture' issues related to the tuner and IF stages.

Controller

Guidelines for troubleshooting the Micro Controller function, especially during startup issues.

Video Processing

Troubleshooting guide for 'No Picture' in RF or AV modes related to video processing.

Audio Processing

Troubleshooting guide for 'No Sound' issues with RF or AV inputs.

Audio Amplifier

Troubleshooting for no audio at the loudspeaker, checking amplifier IC.

Block Diagrams, Testpoint Overviews, and Waveforms

Wiring Diagram

Shows the overall wiring connections between different panels and components in the TV.

Block Diagram Supply and Deflection

Block diagram illustrating the power supply and deflection circuits and their interconnections.

Block Diagram Video

Block diagram showing the video processing path, including tuner, Hercules, and CRT connections.

Block Diagram Audio/Control

Block diagram detailing audio processing, control signals, and connections to various panels.

I2C and Supply Voltage Overview

Overview of I2C bus interconnections and supply voltage distribution throughout the chassis.

Circuit Diagrams and PWB Layouts

Mono Carrier: Power Supply

Circuit diagram and PWB layout for the main power supply (A1).

Mono Carrier: Diversity Table for A1 (Power Supply)

Table showing default values for power supply components across different regions and ranges.

Mono Carrier: Deflection

Circuit diagram and PWB layout for the line and frame deflection system (A2).

Mono Carrier: Diversity Table for A2 (Deflection)

Table detailing deflection component values based on region, screen size, and tube type.

Mono Carrier: Tuner IF

Circuit diagram and PWB layout for the tuner IF section (A3).

Mono Carrier: Hercules

Circuit diagram for the Hercules UOC processor (A4), showing its internal architecture.

Mono Carrier: Features & Connectivities

Circuit diagram and PWB layout for features and connectivity interfaces (A5).

Mono Carrier: Class D - Audio AMP

Circuit diagram and PWB layout for the Class D audio amplifier (A6).

Mono Carrier: Audio Amplifier

Circuit diagram and PWB layout for the audio amplifier (A7), likely the TDA2616Q.

Mono Carrier: Rear I/O Scart

Circuit diagram and PWB layout for the rear I/O SCART connectors (A8).

Mono Carrier: Front Control

Circuit diagram and PWB layout for the front control panel (A9), including IR receiver and buttons.

Mono Carrier: DVD Power Supply

Circuit diagram for the DVD power supply module (A10).

Mono Carrier: CRT Panel

Circuit diagram and PWB layout for the CRT panel (B1), including high voltage and signal connections.

Mono Carrier: Eco Scavem

Circuit diagram and PWB layout for the Eco Scavem circuit (B2) used for picture sharpness.

Side AV + Headphone Panel (PV-2)

Circuit diagram and PWB layout for the side AV input and headphone panel (D).

Side AV + Headphone Panel (FL-13)

Circuit diagram and PWB layout for the side AV input and headphone panel (D) for FL-13 styling.

Top Control Panel (PV2)

Circuit diagram and PWB layout for the top control panel (E) for PV2 styling.

Top Control Panel (FL-13)

Circuit diagram and PWB layout for the top control panel (E) for FL-13 styling.

Power Supply PIP Panel

Circuit diagram and PWB layout for the power supply PIP panel (F1).

Tuner IF and Demodulator PIP Panel

Circuit diagram and PWB layout for the tuner IF and demodulator PIP panel (F2).

Linearity & Panorama Panel

Circuit diagram and PWB layout for the linearity and panorama panel (G).

LTI/CTI Interface Panel

Circuit diagram and PWB layout for the LTI/CTI interface panel (H).

Front Interface Panel (FL-13)

Circuit diagram and PWB layout for the front interface panel (J) for FL-13 styling.

Front Interface Panel (PV-2)

Circuit diagram and PWB layout for the front interface panel (J) for PV-2 styling.

Front Interface and Keyboard Panel

Circuit diagram and PWB layout for the front interface and keyboard panel (J).

Alignments

General Alignment Conditions

Conditions and setup required before performing any electrical alignments on the television set.

Hardware Alignments

Procedures for hardware adjustments like Vg2, focusing, and geometry corrections.

Software Alignments and Settings

Overview of software alignments and settings accessible via Service Modes (SAM).

Option Byte explanation

Detailed explanation of how to change option bytes and their impact on TV functions.

Option Byte explanation

Continues the explanation of option byte settings for various TV features and regional configurations.

Option Byte explanation

Further details on Option Bytes, explaining the function of each bit for specific features.

Tuner

Alignment procedure for the tuner, focusing on AGC adjustment.

White Tone

Procedure for adjusting white tone settings, including black cut-off levels for different color temperatures.

Geometry

Detailed alignment procedures for picture geometry, including horizontal and vertical adjustments.

Audio

Notes on audio alignments, default values for QSS, FMI, and NICAM settings.

Circuit Descriptions, List of Abbreviations, and IC Data Sheets

Introduction

Introduction to the L04 chassis, its features, CRT types, and standard architecture.

Power Supply

Description of the power supply system, including block diagram and standby/power down signals.

Block Diagram

Block diagram of the power supply, showing its main components and voltage outputs.

Timing Diagrams

Timing diagrams illustrating power on, standby, and power off sequences.

Startup Sequence

Explanation of the power-on startup sequence for the television set.

Standby Mode

Description of the standby mode operation and voltage supply to Hercules.

Deflection

Explanation of deflection synchronization, horizontal, and vertical deflection principles.

Synchronization

Details on how the Hercules generates horizontal drive pulses and the role of supply voltages.

Horizontal Deflection

Principles of horizontal deflection, including scan periods, flyback, and linearity correction.

Auxiliary Voltages

Lists and describes auxiliary voltages derived from the LOT for various circuits.

Beam Current

Explanation of beam current adjustment, BCL, and EHT-info characteristics.

X-ray Protection

Explanation of the X-ray protection circuit and its trigger mechanism for EHT.

Vertical Deflection

Description of the vertical deflection stage, including differential drive and component functions.

Tilt and Rotation

Explanation of the rotation control signal and its amplification for picture rotation.

CRT panel

Description of the CRT panel's RGB amplifier stage and Scavem feature.

Control

Description of the Micro Controller (Hercules), NVM IC, and Teletext/CC decoder.

Block Diagram

Block diagram of the Micro Controller application, showing its interfaces and functions.

Basic Specification

Supply voltages and basic specifications for the Micro Controller.

Pin Configuration and Functionality

Overview of Micro Controller port configurations and functions.

Tuner and IF

Description of the tuner and IF system, including features and diversity.

Diversity

Explanation of tuner diversity concepts and their impact on sound/video standards.

Pin Assignments and Functionality

Pin assignments and functions for the tuner and SAW filters.

Option Settings

Details on tuner option settings accessible via SAM mode.

Source Select

Description of audio/video source selection controlled by the Hercules.

Options

Explanation of option settings for source selection accessible in SAM mode.

Diversity

Details on AV source select diversity based on region and set specifications.

Video Processing

Description of video processing features, including brightness, contrast, sharpness, and LTI/CTI.

Features

Features of the Hercules and TDA9178 chips for video processing.

Block Diagram

Block diagram of the video processing part, showing signal flow.

LTI/CTI

Explanation of the TDA9178 IC's Luminance and Color Transient Improvement functions.

Audio Processing

Description of audio decoding via Hercules, including analog and digital decoders, and diversity concepts.

Diversity

Explanation of audio decoding diversity concepts (QSS, Inter Carrier) and region-specific standards.

Functionality

Features of the Hercules for audio processing, including tone controls and surround effects.

Audio Amplifier

Description of the audio amplifier part, its specifications, and output power.

Picture in Picture (PIP)

Explanation of the PIP application, tuners, and the components involved.

Abbreviation list

List of abbreviations used throughout the service manual, with their definitions.

Abbreviation list

Continuation of the abbreviation list, defining technical terms used in the manual.

Abbreviation list

Further continuation of the abbreviation list, defining more technical terms.

Spare Parts List

Set Level

List of spare parts for the main television set, including various components and accessories.

Mono Carrier

List of spare parts for the main mono carrier board, detailing component part numbers and values.

Mono Carrier

Continuation of the mono carrier spare parts list, covering a wide range of electronic components.

Mono Carrier

Further continuation of the mono carrier spare parts list, including components for specific panels.

LTI/CTI Interface [H]

Spare parts list for the LTI/CTI interface panel.

Side A/V Panel + Headphone [D]

Spare parts list for the side AV and headphone panel.

Top Control [E]

Spare parts list for the top control panel.

Front Interface [J]

Spare parts list for the front interface panel.

IC Data Sheets

Diagram F, TDA9887 (IC7201)

Internal block diagram and pin configuration for the TDA9887 IC.

Diagram H, TDA9178 (IC7610)

Internal block diagram and pin configuration for the TDA9178 IC.

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