Philips

Color Television

Chassis

Service Service Service

B8 Series Chasssis Manual 7562

Contents
5. Service Modes, Error Codes and Faultfinding 6. Block Diagrams and Testpoints 7. Electrical Diagrams and PWB's B8 CHASSIS TABLE OF SCHEMATIC DIAGRAMS MAIN CHASSIS (SECTION 1 OF 5) MAIN CHASSIS (SECTION 2 OF 5) MAIN CHASSIS (SECTION 3 OF 5) MAIN CHASSIS (SECTION 4 OF 5) MAIN CHASSIS (SECTION 5OF 5 ) CRT PANEL (13", 19", & 20") CRT PANEL (25" & 27") KEYBOARD/SOUND SHAPER PANEL STEREO PANEL SCHEMATIC OCV TV PANEL SCHEMATIC CARD INTERCONNECT PANEL HEALTH CARE JACK PANEL LODGING/SMART PORT PANEL MAIN CHASSIS PCB (TOP) MAIN CHASSIS PCB (BOTTOM) 13", 19", & 20" CRT PANEL PCB 25", & 27" CRT PANEL PCB KEYBOARD/SOUND SHAPER PCB STEREO PANEL PCB OCV TV PANEL PCB (TOP) OCV TV PANEL PCB (BOTTOM)CARD INTERCONNECT PANEL PCB HEALTH CARE JACK PANEL PCB LODGING/SMART PORT PANEL PCB 8. Adjustments 10. Spare Parts List

©Copyright 2001 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 means, electronic, mechanical, photographic, or otherwise without theprior permission of Philips. Published by Philips Consumer Electronics Subject to modification 2005 Aug 24

20B8(7562)

1 3 Vp-p 50 uSec

2 3.2 Vp-p 20 uSec

3 1 Vp-p 20 uSec

4 5.6 Vp-p 5 mSec

5 4.9 Vp-p 20 uSec

6 50 Vp-p 5 mSec

7 800 mVp-p 5 mSec

8 2.7 Vp-p 5 mSec

9 400 mVp-p 5 mSec

10 29 Vp-p 5 mSec

11 1.5 Vp-p 5 mSec

12 2.2 Vp-p 20 uSec

13 2.2Vp-p 20 uSec

14 2.2 Vp-p 20 uSec

15 3.5 Vp-p 20 uSec

16 3.6 Vp-p 5 mSec

17 450 mVp-p 5 mSec

18 750 mVp-p 5 mSec

19 5 Vp-p 20 uSec

20 4.2 Vp-p 20 uSec

20B8(7562)

21 1.2 Vp-p 20 uSec

22 220 mVp-p 0.5 uSec

23 1.2 Vp-p 20 uSec

24 1.2 Vp-p 20 uSec

25 1.2 Vp-p 20 uSec

26 1.4 Vp-p 20 uSec

27 2.5 Vp-p 20 uSec

28 1 Vp-p 20 uSec

29 1.4 Vp-p 20 uSec

30 2.5Vp-p 20 uSec

31 2.5 Vp-p 20 uSec

32 1.6 Vp-p 20 uSec

33 120 Vp-p 20 uSec

34 1040 Vp-p(a) 20 uSec

35 1 Vp-p 20 uSec

36 1.8 Vp-p 20 uSec

37 2 Vp-p 20 uSec

38 110 Vp-p 20 uSec

39 110 Vp-p 20 uSec

40 850 mVp-p 5 mSec

20B8(7562)

41 110 Vp-p 20 uSec

B8 COLOR TV CHASSIS OVERVIEW
The B8 Series Chassis is the Statement (standard line) TV Set produced by PhilipsConsumer Electronics Company for the 1997 model year. The B8 Chassis is used in TV Sets with 25, and 27 inch CRT's. The B8 Chassis is also used in Commercial TV Sets with 13, 19, 20, 25, and 27 inch CRT's. The chassis orientation is front to rear in the B8 design (sometimes called "NorthSouth"), because the chassis is longer in this direction than across. The B8 Tuning System features 181 Channelswith On-Screen Display. The main Tuning System includes the tuner along with the Microcomputer IC and the Memory IC. The Microcomputer communicates with the Memory IC, the Customer Keyboard, the Remote Receiver, the U/V Tuner, the TV Signal Processor, the Stereo Decoder (optional), and the Power On/Off circuitry. The Memory IC retains the settings for Favorite Stations, Customer Control Settings,Mode Switches, and Service/Factory Setup Data. The chassis features a Very Large Scale Integration (VLSI) IC for TV signal processing. This IC performs Video IF, Sound IF, AGC control, Horizontal Signal processing, Vertical Signal processing, Horizontal/Vertical synchronization, and Chrominance/Luminance processing. The On-Screen Graphics information is placed on the main signal within the TVSignal Processor. OnScreen Graphics generation and Closed Caption decoding are processed within the Microcomputer and the signals are sent to the TV Signal Processor. Automatic Volume Level (AVL - called "SMART SOUND" by marketing) control from the Microcomputer is sent to the AVL IC. The "Smart Sound" function is performed within IC720. The B8 Chassis features a Switching Mode Power Supply for the...