Philips MG5.1E AA Chassis, Training Manual.pdf

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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 at the edges of the screen. They may be bowed inward.
PROBLEM - BOTTOM CORNERS DARK
PROBLEM - BOTTOM CORNERS COLORED
There is no problem with the set. The viewing angle is too high.
Personal notes

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