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Philips 21PT9457 - Service Manual

Philips 21PT9457
56 pages
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Published by JY 0769 BG CD Customer Service Printed in the Netherlands Subject to modification EN 3122 785 17450
©
Copyright 2007 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
SK4.0L
CA
H_17210_000.eps
070607
Contents Page
1. Technical Specifications, Connections, and Chassis
Overview 2
2. Safety Instructions, Warnings, and Notes 4
3. Directions for Use 6
4. Mechanical Instructions 7
5. Service Modes, Error Codes, and Fault Finding 9
6. Block Diagrams, Test Point Overviews, and
Waveforms
Block Diagram Chassis 11
Schematic Overview Chassis 12
7. Circuit Diagrams and PWB Layouts
Mono Carrier: Power Supply (A1) 13 21-22
Mono Carrier: Line Deflection (A2) 14 21-22
Mono Carrier: Frame Deflection (A3) 15 21-22
Mono Carrier: Tuner IF (A4) 16 21-22
Mono Carrier: AV Switch (A5) 17 21-22
Mono Carrier: Audio Amplifier (A6) 19 21-22
Mono Carrier: Tone Control (Optional) (A7) 18 21-22
Mono Carrier: CPU & Decoder (A8) 20 21-22
Keyboard Control Panel (D) 23 24
Main Switch Panel (E) 25 25
Side A/V Panel (G) 26 26
BTSC Panel (G) 27 27
Slim EW Panel (M) 28 28
Sub Woofer Panel (Optional) (Z) 29 30
8. Alignments 31
9. Circuit Descriptions, Abbreviation List, and IC Data
Sheets 36
Abbreviation List 37
IC Data Sheets 38
10. Spare Parts List 53
11. Revision List 56

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Philips 21PT9457 Specifications

Picture and Display IconPicture and Display
aspect ratio4:3
diagonal screen size21 inch / 53 cm
visible diagonal screen size51 cm
Sound IconSound
output power (RMS)2 x 3W
sound systemStereo, SAP
sound enhancementBalance, Incredible Surround, Treble and Bass Control
Tuner and Reception IconTuner and Reception
aerial input75 ohm F-type
number of preset channels181
tv systemNTSC, PAL M, PAL N
Power IconPower
mains powerAC 100-240V, 50/60Hz
power consumption72 W
standby power consumption<3W
Weight and Dimensions IconWeight and Dimensions
set dimensions (W x H x D)594 x 461 x 327 mm
box dimensions (W x H x D)660 x 532 x 396 mm
product weight20 kg

Summary

Technical Specifications, Connections, and Chassis Overview

Technical Specifications

Details about display, sound, and miscellaneous technical aspects of the television.

Connection Overview

Explains connector color codes and lists rear/side connections with specifications.

Chassis Overview (Mechanical chassis)

Provides a visual overview of the chassis components and their physical layout.

Safety Instructions, Warnings, and Notes

Safety Instructions

Guidelines for safe repair procedures, component replacement, and post-repair checks.

Maintenance Instructions

Recommendations for periodic maintenance and inspection intervals based on usage.

Warnings

Important cautions regarding high voltage, ESD, and safe tool usage during service.

Notes

General notes on measurement conditions, Dolby trademarks, and component interchangeability.

Schematic Notes

Explains conventions for resistor and capacitor values in schematics.

Lead-free Soldering

Guidelines and precautions for performing lead-free soldering.

Alternative BOM identification

Explains how to identify different Bill of Materials (BOM) versions using serial numbers.

Practical Service Precautions

General safety precautions for service technicians regarding electrical shock.

Directions for Use

Mechanical Instructions

Set Disassembly

Step-by-step guide for disassembling the television set, including rear cover removal.

Assembly; Board Removal

Instructions for removing and replacing internal boards like the side I/O panel.

Set Re-assembly

Guidance on reassembling the television after repairs, ensuring correct component placement.

Service Modes, Error Codes, and Fault Finding

Test Points

Reference to test points described in chapter 6 for measurements.

Service Modes

Information on accessing factory and service modes for adjustments.

Error Codes

States that error codes are not applicable for this specific model.

Fault Finding

Troubleshooting guide for common TV issues like power failure and picture problems.

Block Diagrams, Test Point Overviews, and Waveforms

Block Diagram Chassis

High-level block diagram illustrating the main sections of the TV chassis.

Schematic Overview Chassis

Overall schematic diagram providing a consolidated view of the chassis circuitry.

Circuit Diagrams and PWB Layouts

A1 POWER SUPPLY

Circuit diagram for the power supply unit.

A2 LINE DEFLECTION

Circuit diagram for the line deflection system.

A3 FRAME DEFLECTION

Circuit diagram for the frame deflection system.

A4 TUNER IF

Circuit diagram for the tuner and IF section.

A5 AV SWITCH

Circuit diagram for the AV switching circuitry.

A6 TONE CONTROL (Optional)

Circuit diagram for the optional tone control module.

A7 AUDIO AMPLIFIER

Circuit diagram for the audio amplifier stage.

A8 CPU & DECODER

Circuit diagram for the CPU and decoder section.

Layout Mono Carrier (Top Side)

PWB layout for the mono carrier, top view.

Layout Mono Carrier (Bottom Side)

PWB layout for the mono carrier, bottom view.

D KEYBOARD CONTROL

Circuit diagram for the keyboard control panel.

Layout Keyboard Control Panel (Top Side)

PWB layout for the keyboard control panel, top side.

Layout Keyboard Control Panel (Bottom Side)

PWB layout for the keyboard control panel, bottom side.

E MAIN SWITCH

Circuit diagram for the main switch panel.

Layout Main Switch (Top Side)

PWB layout for the main switch panel, top side.

G SIDE AV Panel

Circuit diagram for the side AV panel.

Layout Side A;V Panel

PWB layout for the side AV panel.

K BTSC Panel

Circuit diagram for the BTSC panel.

Layout BTSC Panel (Top Side)

PWB layout for the BTSC panel, top side.

Layout BTSC Panel (Bottom Side)

PWB layout for the BTSC panel, bottom side.

M SLIM EW Panel

Circuit diagram for the Slim EW panel.

Layout Slim EW Panel

PWB layout for the Slim EW panel.

Z SUB WOOFER Panel (Optional)

Circuit diagram for the optional subwoofer panel.

Layout Sub Woofer Panel

PWB layout for the subwoofer panel.

Alignments

General Alignment Conditions

Conditions required for performing electrical adjustments, including power supply and warm-up.

Hardware Alignments

Details on hardware adjustments, specifically the main voltage (B+) adjustment.

Software Alignments

Steps for accessing and performing software-based alignments via the factory menu.

Rf AGC Voltage Adjust

Procedure to adjust RF AGC voltage for optimal reception.

Focus Fine Adjust

Procedure to adjust focus using the flyback transformer knob for picture clarity.

Screen Voltage Adjust (Key 0)

Procedure to adjust screen voltage for picture brightness and level line.

Horizontal Adjustment (key 1)

Procedure to adjust horizontal picture centering using HPH parameter.

Vertical & YUV;RGB Horizontal Adjust (key2)

Adjustments for vertical and horizontal picture geometry and display ratio.

OSD Position (Key 4)

Procedure to adjust the position of the On-Screen Display (OSD) and LOGO.

Circuit Descriptions, Abbreviation List, and IC Data Sheets

Introduction

Overview of the SK4.0A CA chassis and the manual's chapter structure.

The various circuits

General descriptions of the TV's functional circuits like tuner, IF, and sound channels.

IC Data Sheets

Shows internal block diagrams and pin layouts of key ICs used in the TV.

Abbreviation List

Glossary of technical abbreviations used throughout the service manual.

Diagram A1, W6554 A, (IC601)

Block diagram and pin configuration for IC601 (W6554A).

Diagram A1, P412, (IC602)

Pin configuration diagram for IC602 (P412).

Diagram A3, TDA486 x, (IC301)

Block diagram and pin configuration for IC301 (TDA486x).

Diagram A5, 4052, (IC102)

Block diagram and pin configuration for IC102 (4052).

Diagram A7, TDA9842, (IC402)

Block diagram and pin configuration for IC402 (TDA9842).

Diagram A7, TDA9850, (IC801)

Block diagram and pin configuration for IC801 (TDA9850).

Diagram A8, OM837 x (IC201)

Block diagram for IC201 (OM837x).

Diagram A8, TDA937 x (IC201)

Block diagram and pin configuration for TDA937x (IC201).

Diagram A8, 24 C08 (IC202)

Block diagram for IC202 (24C08).

Spare Parts List

Set Level

List of spare parts categorized by set level.

Various

General list of various spare parts not specific to a board.

Main Board [B]

Spare parts list specifically for the main board.

Keyboard & Control Panel [D]

Spare parts list for the keyboard and control panel components.

BTSC Panel [K]

Spare parts list for the BTSC panel.

Revision List

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