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Colour Television Chassis MG5.1E AA Contents 1 2 3 4 5 6 7 8 9 10 11 MG99 Light path Introduction Overall blockdiagram Power supply Scan circuits Small signal panel CRT drive circuit Interface panel SIDE JACK panel Audio signal part Digital convergence circuit Page 2 8 9 11 24 29 69 72 74 75 80 © 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. Printed in the Netherlands Subject to modification 5 3122 785 10053 Published by LM 9972 Service PaCE 2 1. MG99 Light path MG5.1E 1. MG99 Light path MIRROR R+G+B RED GREEN BLUE FRESNAL LENS LENTICULAR SCREEN CL 96532100_078.eps 121199 Figure 1-1 The MG99 Projection TV uses three single color tubes, Red, Green, and Blue. (Figure 1-1) The output of each tube is projected onto a mirror where it is then reflected onto a viewing screen. The Tubes are converged so the light from each tube strikes the same spot on the Fresnel Lens. The Fresnel Lens equalizes and concentrates the light to provide equal light uniformity across the screen. The Mirror is a first surface mirror type which has the reflective coating on the outside of the mirror. To prevent scratching of this surface, always use a soft cotton cloth to clean it. Personal notes MG5.1E 1. MG99 Light path 3 BLACK STRIPING OUTPUT LIGHT CL 96532100_079.eps 111199 Figure 1-2 The Lenticular Lens Screen calumniates the light from the Fresnel Lens. (Figure 1-2) The Lenticular Lens increases contrast by reducing the ambient light by the use of Black Striping. The Prismatic formation of the screen allows for nearly 3X light output as compared to a flat screen. Caution should be used when working with the screen. Damage can easily occur in the form of scratching, or by using certain chemical screen cleaners which can strip the black striping from the screen. To clean the screen, use one drop of dish washing detergent in a small bowl of water. (approximately 2 liters) Wipe the screen with a soft cotton cloth in the direction of the stripes. Personal notes 4 1. MG99 Light path MG5.1E C ELEMENT LENS CRT OUTPUT LENS LIQUID COOLANT CL 96532100_080.eps 111199 Figure 1-3 The Three CRT's are driven by 30KV of high voltage and 15KV of focus voltage. (Figure 1-3) The Tube produces a highly concentrated light output of color. A liquid coolant of Glycol is used to transfer heat from the face of the tube to the surrounding mechanical assembly. The C-element lens seals the Coupling fluid within the coupler. The C-element lens and Coupling fluid are part of the light path and contribute to the properties of the optical system. Personal notes MG5.1E 1. MG99 Light path 1.1 MG99 LIGHT PATH PROBLEMS 5 1.1 MG99 LIGHT PATH PROBLEMS CL 96532100_107.eps 021299 Figure 1-4 Look a