Philips L9.2A User Manual

1
Published by JvR 9965 Service PaCE Printed in the Netherlands Subject to modification 5 4822 727 21705

Copyright reserved 1999 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
L9.2A
AA
CL 96532047_013.eps
270599
Contents Page
1. Technical Specifications 2
2. Safety- and maintenance instructions, 3
warnings and notes. 4
3. Directions for use 5
4. Mechanical instructions 14
5. Service modes, faultfinding and repair tips 15
6. Faultfinding trees 21
Supply voltage diagram 25
Blockdiagram 26
Testpointsoverview and oscillograms 27
7.
Electrical diagram’s en PWB’s Diagram PWB
Power supply (Diagram A1) 28 34/37
Diversity table A1 29
Horizontal deflection (Diagram A2) 30 34/37
Vertical deflection (Diagram A3) 31 34/37
Synchronisation (Diagram A4) 31 34/37
Tuner en video IF (TDA 8844) (Diagram A5) 32 34/37
Diversity table A5 33
Video processing (Diagram A6) 38 34/37
Control (Diagram A7) 39 34/37
Front control (Diagram A8) 40 34/37
Smart sound & mono amplifier (Diagram A10) 41 34/37
Front cinch and headphone (Diagram A11) 42 34/37
Rear IO Cinches (Diagram A12) 43 34/37
CRT Panel (Diagram B) 44 45
BTSC decoder (Diagram C1) 46 48
BTSC Audio amplifier (Diagram C2) 47 48
ITT Audio decodering (Diagram D1) 49 45
ITT Audio amplifier (Diagram D2) 50 45
Side AV panel (Diagram E) 51 51
8. Alignments 53
9. Circuit description new circuits and 56
list of abbreviations 61
10. Spareparts list 64

Philips L9.2A Specifications

General

Brand	Philips
Model	L9.2A
Category	TV
Language	English

Summary

Service Manual Overview

Technical Specifications

General Specifications

Details mains voltage, power consumption, and standby power.

Terminal Socket Specifications

Details AV, Headphone, and SVHS socket specifications.

Safety, Maintenance, and Warnings

Safety Instructions for Repairs

Outlines essential safety precautions during television repair procedures.

Maintenance Instructions

General Warnings

Covers ESD precautions, handling sensitive components, and general repair safety advice.

Directions for Use

Connecting Peripheral Equipment

TV Controls and Remote Operation

Explains the function of TV buttons and remote control operations for various features.

Menu Navigation and TV Setup

Details accessing TV menus for adjustments and initial installation procedures.

Channel Tuning and Picture Settings

Teletext and Troubleshooting

Pre-Service Checks

Lists common symptoms and basic troubleshooting steps before contacting service.

Service and Mechanical Information

Service Modes, Fault Finding, and Repair Tips

Covers service modes, diagnostic tools, and troubleshooting advice.

Service Default Mode (SDM)

Explains the purpose and entry/exit procedures for the Service Default Mode.

Service Alignment Mode (SAM)

Details the Service Alignment Mode for tuning, geometry, and sound adjustments.

Service Menus and Error Handling

Service Menu Structure

Error Code Buffer and Codes

Explains the error buffer function and lists specific error codes and their meanings.

Troubleshooting Procedures

Blinking LED Procedure for Diagnostics

Troubleshooting Tips for Circuits

Provides specific tips for diagnosing deflection and power supply circuits.

Customer Service Mode (CSM)

Advanced Diagnostics and Tools

ComPair Service Tool Overview

Introduces ComPair for fault finding, diagnostics, and managing presets.

SearchMan Electronic Manual Integration

ComPair Interface Connection Guide

ComPair Tool Setup and Ordering

Alignment Procedures

General Alignment Conditions

SDM and SAM Menu Selection

Details how to enter the Service Default Mode and Service Alignment Mode menus.

VG2 Electrical Alignment

Guides on adjusting the VG2 for picture centering and vertical scan.

Electrical and Software Alignments

Focusing and Power Supply Adjustment

Geometry Software Adjustments

Details geometric picture adjustments using software controls.

Tuner, White Tone, Audio, and Option Alignments

AGC Alignment Procedure

IF-PLL and IF-PLL POS Alignment

White Tone and Audio Alignments

Circuit Descriptions - Power Supply

Power Supply System Overview

Describes the switch mode power supply (SMPS) characteristics and output voltages.

Primary Side Operations

Circuit Descriptions - Control and Audio

Control Circuitry Functions

Explains the control mechanisms of IC7520 for power supply regulation.

Audio Processing Systems Overview

Circuit Descriptions - Audio Systems and Tuner/IF

Mono/AV Stereo and 2CS Audio Paths

BTSC Audio Processing Details

Tuner and Video IF Stage Functions

Circuit Descriptions - Tuner, IF, and Video Processing

Tuner Pin Descriptions and Functionality

IF Filter and Video IF Stages

IF Amplifier, PLL, Video Buffer, AGC, AFC

Details the functions of IF amplifier, PLL demodulator, video buffer, AGC, and AFC circuits.

Video Signal Processing Overview

Circuit Descriptions - Video Signal Paths

CVBS, Y/C Input Selection Logic

Luminance and Chroma Signal Processing

PAL/NTSC/SECAM Demodulation

YUV/RGB Processing and Black Stretching

Circuit Descriptions - RGB and CRT

Second RGB Signal Insertion Method

RGB Signal Processing and Adjustment

Black Current Calibration and Limiting

Covers calibration of black current and beam current limiting for CRT protection.

CRT Panel Output Amplifiers