Philips M123A Service Manual
  1. Manuals
  2. Brands
  3. Philips Manuals
  4. TV
  5. M123A
  6. Service manual
Philips M123A Service Manual

Philips M123A Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Colour Television
Service
Service
3. Directions for Use
6. Block Diagram, I2C
7. Electrical Diagrams and Test Point with waveform diagram
8. PCB diagram
Main PCB
CRT PCB
MPX PCB
SIDE AV PCB
9. Alignment Procedures
10. Circuit Description
11. List of Abbreviations
12. Spare Parts List
6
Copyright 2001 Philips Consumer Electronics B.V. Eindhoven, The Netherlands.All
©
rights reserved. No part of this publication may be reproduced, stored in aretrieval system or
transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise
without the prior permission of Philips.
Contents
Overview Block Diagram
I C
2
BTSC (Stereo/SAP) Decoder(Diagram A6)
CRT Panel (Diagram B)
Transistor Test Voltage
Test point with Waveform Diagram
1
Chassis: M123A
Page
2 - 3
4 - 5
6 - 32
33
34 -40
41
42-43
44
44
45
45
46
47
47
48
48
49
49
50 - 51
52
53
54
55
56 - 64
65
66 - 68
69 - 89

Advertisement

Table of Contents
loading

Related Manuals for Philips M123A

Summary of Contents for Philips M123A

  • Page 1: Table Of Contents

    66 - 68 12. Spare Parts List 69 - 89 Copyright 2001 Philips Consumer Electronics B.V. Eindhoven, The Netherlands.All © rights reserved. No part of this publication may be reproduced, stored in aretrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise...

  • Page 2: Technical Specifications, Connections And Chassis Overview

    Colour Television Chassis: M123A 1. Technical Specifications, Connections and Chassis Overview Index: Sound systems : FM-mono: FM-stereo 1. Technical Specifications. A/V connections : NTSC 3.58 2. Connections. Channel selections :TV:2-69,CATV:2-13,A-W, 3. Chassis Overview. W+1~W+84,A-5~A-1,5A Note: Aerial input : 75OHM, 1VP-P...
  • Page 3 Colour Television Chassis: M123A 1.3 Chassis Review 7.1 Power Supplier CRT PANEL 7.2 Line Deflection Side 7.3 Frame Deflection Panel Main 7.4 Tuner IF Chassis Panel 7.5 MCU, Video IF and Sound IF 7.6 BTSC (Stereo/SAP) MSP PANEL Decode 7.7 Video Source...

  • Page 4: Safety & Maintenance Instructions, Warnings And Notes

    Colour Television Chassis: M123A 2. Safety & Maintenance Instructions, Warnings and Notes 2.1 Safety Instructions For Repairs Safety regulations require that during a repair: --Due to the 'hot' parts of this chassis, the set must be connected to the AC power via an isolation transformer.
  • Page 5 Colour Television Chassis: M123A 2.3 Warnings --- In order to prevent damage to ICs and transistors, avoid all high voltage flashovers. In order to prevent damage to the picture tube, use the method shown in Fig. 2-1, to discharge the picture tube.

  • Page 6: Mechanical Instructions

    Colour Television Chassis: M123A 4. Mechanical Instruction Index: 1. Rear Cover Removal 2. Service Position Main Panel 3. Side I/O Panel Removal 4. Rear Cover Mounting Note: Figures can deviate slightly from the actual situation, due to different set executions.

  • Page 7: Faultfinding

    Colour Television Chassis: M123A 5. Faultfinding and Test Point with Waveform Diagram 5.1 Faultfinding Fuse Blown Figure 1 Fuse Blown Is the drain of D815~D818 Replace Q801 shorted D815~D818 to earth? Check IC801 and Cheek peripheral Replace components. Q801 Figure2...
  • Page 8 Colour Television Chassis: M123A 5. Faultfinding and Test Point with Waveform Diagram 5.1 Faultfinding No raster Replace IC201 Replace Q401 B Voltage OK Yes Check the waveform H-out Is the voltage Check Q402 waveform at PIN static working of in 25 of...
  • Page 9 Colour Television Chassis: M123A 5. Faultfinding and Test Point with Waveform Diagram Symptom: raster ok, no picture, no sound, sparse 5.1 Faultfinding noise dots Figure 5 Sparse noise dots Apply the pointer of multimeter at R X 1 KΩ, connect one probe to GND,...
  • Page 10 Colour Television Chassis: M123A 5. Faultfinding and Test Point with Waveform Diagram No sound 5.1 Faultfinding Is the speaker Replace the speaker Figure 6 No Sound Replac e IC601 Apply the pointer of multimeter at RX1K Ω connect one probe to...
  • Page 11 Colour Television Chassis: M123A 5. Faultfinding and Test Point with Waveform Diagram 5.1 Faultfinding Figure 8 No Picture Check Check R516 ~ Check +9V, TV&AV Q501~Q503 R521 etc. +200V haven’t Picture Check P25, P49 of IC201 Replace IC201 Check RGB signal and the relative circuit TV has Picture.

  • Page 12: Power Supply (Diagram A1)

    Colour Television Chassis: M123A 5. Faultfinding and Test Point with Waveform Diagram 5.1 Faultfinding Figure 9 Tuning Control doesn’t work Check the power Symptom: supply of IC201. Check Tuning Control Are there H & V R408,R406,D404,C422 doesn’t work flyback pulses at...
  • Page 13 Colour Television Chassis: M123A ① Check the remote control Is there any change on the voltage level at receiver and transmitter. P64 of IC201? Is the VDD(+5V) at Check Q002 and P9 and P55 of IC201 peripheral circuit Is there the 8MHz/5Vp-p...
  • Page 14 Colour Television Chassis: M123A 6. Block Diagram and I2C 6.1 Block Diagram...
  • Page 15 Colour Television Chassis: M123A 6. Block Diagram and I2C 6.2 I2C 0.8V 0.4V 5.1V 5.0V 2.4V 5.1V 4.5V 14 V 4.7V 2.4V 5.2V 0.8V 2.2V 2.0V 6.3V 4.2V 2.0V 6.5V 4.5V 6.5V 5.1V 5.1V 6.5V 5.1V 3.0V 1.5V 2.5V 13.2V 6.0V...
  • Page 16 Colour Television Chassis: M123A 6. Block Diagram and I2C 6.2 I2C 4. 5 V 4. 5 V 4. 5 V 0~9 V 0~9 V 0~9 V 61.5 V 13.2 V 4. 5 V...

  • Page 17: Line Deflection (Diagram A2)

    Colour Television Chassis: M123A 7. Electrical Diagrams 7.1 Power Supplier 7. Electrical Diagrams a Line Deflection WF 1 WF 3 WF 2...

  • Page 18: Frame Deflection (Diagram A3)

    Colour Television Chassis: M123A 7. Electrical Diagrams 7.3 Frame Deflection WF 4 WF 6 WF 5 7. Electrical Diagrams Tuner IF .

  • Page 19: Mcu,Video If And Sound If (Diagram A5)

    Colour Television Chassis: M123A 7. Electrical Diagrams MCU,Video IF and Sound IF WF 7 WF 8 WF 10 WF 9 WF 11...

  • Page 20: Video Source Switching (Diagram A7)

    Colour Television Chassis: M123A 7. Electrical Diagrams VBTSC (Stereo/SAP) Decode 7. Electrical Diagrams Video Source Switching...

  • Page 21: Side Av (Diagram A8)

    Colour Television Chassis: M123A 7. Electrical Diagrams 7.8 Side AV 7. Electrical Diagrams Audio Amplifier...

Table of Contents