Philips MG5.1E Manuel utilisateur
Published by LM 9972 Service PaCE Printed in the Netherlands Subject to modification 53122 785 10053
©
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.
Colour Television Chassis
MG5.1E
AA
Contents Page
1 MG99 Light path 2
2 Introduction 8
3 Overall blockdiagram 9
4 Power supply 11
5 Scan circuits 24
6 Small signal panel 29
7 CRT drive circuit 69
8 Interface panel 72
9 SIDE JACK panel 74
10 Audio signal part 75
11 Digital convergence circuit 80
2 1. MG99 Light path MG5.1E
Personal notes
1. MG99 Light path
Figure 1-1
BLUE
GREEN
RED
MIRROR
FRESNAL
LENS LENTICULAR
SCREEN
R+G+B
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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.
MG5.1E 1. MG99 Light path 3
Personal notes
Figure 1-2
LIGHT
OUTPUT
BLACK STRIPING
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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.
4 1. MG99 Light path MG5.1E
Personal notes
Figure 1-3
CRT
C ELEMENT LENS
LIQUID COOLANTOUTPUT LENS
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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.
MG5.1E 1. MG99 Light path 5
1.1 MG99 LIGHT PATH PROBLEMS
Personal notes
1.1 MG99 LIGHT PATH PROBLEMS
Figure 1-4
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021299
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.
6 1. MG99 Light path MG5.1E
1.1 MG99 LIGHT PATH PROBLEMS
Personal notes
Figure 1-5
CL 96532100_109.eps
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Fresnel may be reversed. Carefully remove the fresnel and
point the grooves toward the viewer.
PROBLEM - BRIGTH AND DARK LINES ON A WHITE FIELD
MG5.1E 1. MG99 Light path 7
1.1 MG99 LIGHT PATH PROBLEMS
Personal notes
Figure 1-6
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The Fresnel offset is pointing down. The center of the Fresnel
should be toward the top of the screen.
PROBLEM- UPPER CORNERS OF THE SCREEN DARK
8 2. Introduction MG5.1E
Personal notes
2. Introduction
The 1999 MG99 PTV chassis is designed for the European
market. It is available in a 46 inch (117 cm) and a 55 inch (140
cm) 16 by 9 aspect ratio screen sizes. Selected Video can be
displayed in either a 4 by 3, 14 by 9, or 16 by 9 aspect ratios.
The set has a viewing angle of 160 degrees.
The MG99 PTV is capable of receiving signal from PAL B/G,
PAL B/G 6OHz, PAL B/H, PAL D/K, PAL 1, PAL M, PAL N, PAL
plus, SECAM B/G, SECAM D/K, SECAM L, AND SECAM Li TV
systems. There are four composite video inputs which include
three SCART connectors, and a Side Jack panel. The systems
that can be applied to these inputs are NTSC 3.58, NTSC 4.43,
NTSC Play Back, PAL 4.43, PAL, B/G Play Back, SECAM, and
SECAM Play Back.
The set is equipped with a Frame and Line doubler to produce
a horizontal resolution greater than 800 lines. The picture
display is driven by three seven inch Red, Green, and Blue
tubes.
The Sound system is driven by a 2 times 20 watt power
amplifier. A switch in the rear of the set allows the sets internal
speakers to be driven by an external amplifier.
The following sets will be sold in Europe:
46PP9501/05U.K. and Ireland
55PP9501/05U.K. and Ireland
46PP9501/12Western Europe
55PP9501/12Western Europe
46PP9501/58Eastern Europe
55PP9501/58Eastern Europe
These units will be distributed from Philips Bundling Center in
Bruges, Belgium.
9 3. Overall blockdiagram MG5.1E
3. Overall blockdiagram
Figure 3-1
Y_CVBS
C
L
R
DELAY SVM
MODULE
CRT
DRIVE
CIRCUIT
GREEN
CRT RED
CRT
BLUE
CRT
Y
R
G
B
G
B
R
AUDIO
AMPLIFIER
LEFT AUDIO
RIGHT AUDIO
LINE
DRIVE
FRAME
DRIVE
HV
CIRCUIT FOCUS/G2
BLOCK
LINE SYNC
FRAME SYNC
CONVERGENCE
PANEL
INTENSITY
CONTROL
CONV R, G, B, FB
CONV R, G, B, FB
INTERFACE PANEL
HV/SCAN
PANEL
CONV
YOKES
SIDE JACK
PANEL
MG99 SMALL
SIGNAL PANEL
LINE SYNC
FRAME SYNC
+5V STBY
+15V STBY
+130V
+38V
-38V
+33V
+15V
-15V
-7V7
+8V6
+5V2
POWER
SUPPLY
AC
SWITCH
PANEL
SWITCH
SPEAKER
FOCUS
G2
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10 3. Overall blockdiagram MG5.1E
Personal notes
There are eleven PC boards in the MG99 chassis. (Figure 3-1)
They are the Small Signal panel, Side Jack panel, Power
Supply panel, Interface panel, SVM module, Blue CRT panel,
Green CRT panel, Red CRT panel, High Voltage Scan panel,
and Convergence panel.
Whenever AC power is applied to the set and the Mains switch
is turned On, the Power Supply panel produces a 5 and a 15
volt standby supplies. When the set is turned On by the channel
up button on the Front Keyboard or the Remote Control, the
130 volt, 38 volt, -38 volt, 33 volt, 15 volt, -15 volt, -7.7 volt, 8.6
volt, and 5.2 volt supplies are switched On.
Frame and Line drive from the Small Signal panel is routed
through the Interface Panel to the Frame Drive and Line Drive
circuits on the High voltage Scan panel. The High Voltage scan
panel produces the High Voltage and Sync to the Convergence
panel. Focus voltage from the High Voltage circuit is fed to a
Focus/G2 block which provides Focus and G2 voltage to the
three CRT'S. During the Convergence adjustment mode, Red,
Green, Blue, and Fast Blanking from the Convergence Panel is
fed to the Small Signal panel to generate the adjustment grid.
The Small Signal panel selects video from the Antenna input,
one of the three Scart connectors, or the Side Jack panel. The
Small Signal panel outputs Red, Green, and Blue drive to the
CRT drive circuit located on the Interface Panel. The CRT drive
circuit then provides drive for the three CRT panels.
Left and Right channel audio from the Small Signal panel is
routed through the Interface Panel to the Audio Amplifier panel.
The Audio Amplifier panel has its own separate Switch Mode
power supply. The output of the Audio Amplifier is then fed to
the Speaker Switch panel which selects between the Audio
Amplifier or External Audio from a separate amplifier.
Luminance or Y from the Small Signal panel is fed to a Delay
circuit on the Interface panel before being applied to the SVM
panel. The Scan Velocity Module speeds up the beam during
light to dark transitions in the picture to provide a sharper
image.
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