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1 Colour television Chassis A8.0E Training Manual Contents Introduction Mechanical Control Power supply Video processing Synchronization Audio processing Horizontal deflection Vertical deflection Teletext + On-Screen Display Widescreen view modes Published by TG9872 Television Service Department Printed in The Netherlands Copyright reserved 1998 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 2 3 9 24 34 48 50 56 75 78 84 5 4822 727 21648 ©Copyright reserved 1998 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 Published by TG9872 Television Service DepartmentPrinted in The Netherlands 5 4822 727 21648 2 INTRODUCTION Block diagram A8.0E INTRODUCTION Block diagram 1125 TUNER 7150-A IF YC PIP PANEL Y Y/CVBS IO PANEL C C Y COMB FILTER PANEL C Y C 7150-0 VIDEO PROCESSING Y U V DW PANEL YU V YU V YUV PANEL 7150-C RGB PROCESSING RGB AMP SCAVEM R G B RGB SWITCH SIF QSS PANEL AM SOUND PROCESSING AUDIO AMPLIFIER TOP CONTROL PANEL OSD/TXT CONTROLS I2C 7150-D SYNC LINE DRIVE LOT 220V SUPPLY SMPS EW+ PANORAMA PANEL +140 +33 +14 +8 +15 +5 +5 - STBY FRAME AMPLIFIER CL 86532033_009.AI 160698 · · · · · · · · A Switched Mode Power Supply (SMPS) is used to supply the line deflection stage (+140), the sound output stage (+15) and a number of other low voltages (+14V, +8V, +5V and +5V Standby) The controls located on the mono carrier are activated by the keyboard and RC5 signals from the remote control receiver. The internal control is via I2C. The 38.9 MHz IF video signal coming from the tuner is fed to the TDA884x (IC7150). This IC incorporates the video processing circuitry (PAL, NTSC and SECAM), synchronisation and geometry control. The sound processing section of the set is multi standard and uses a MSP3410 (mono, 2CS stereo and NICAM). In some stereo sets (mainly NICAM and FM DK) the QSS panel (Quasi Split Sound) will be applied to improve the SIF signal The CRT-panel contains integrated RGB amplifiers and SCAVEM circuitry. The RGB signals are then transmitted to the picture tube via the RGB amplifiers. The horizontal and vertical deflection signals (line and frame) are amplified in the driver stages, which drive the deflection coils. In all sets except 21" E/W correction is needed which is accommodated on a separate panel. For 16:9 sets the panorama circuitry is also accommodated on this panel Personal notes A8.0E Mechanical Chassis Set-up 3 Mechanical Chassis Set-up POWER SUPPLY HOR. DEFLECTION + LINE OUTPUT VERTICAL DEFLECT