Philips MG5.1E Bedienungsanleitung

Published by LM 9972 Service PaCE Printed in the Netherlands Subject to modification 53122 785 10053

stored in a retrieval system or transmitted, in any form or by any means, electronic,

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Colour Television Chassis

MG5.1E

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

CL 96532100_078.eps

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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

CL 96532100_079.eps

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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

CL 96532100_080.eps

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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

CL 96532100_107.eps

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

CL 96532100_110.eps

151199

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

DELAY SVM

MODULE

CRT

DRIVE

CIRCUIT

GREEN

CRT RED

CRT

BLUE

CRT

AUDIO

AMPLIFIER

LEFT AUDIO

RIGHT AUDIO

LINE

DRIVE

FRAME

DRIVE

CIRCUIT FOCUS/G2

BLOCK

LINE SYNC

FRAME SYNC

CONVERGENCE

PANEL

INTENSITY

CONTROL

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

SWITCH

PANEL

SWITCH

SPEAKER

FOCUS

CL 96532100_081.eps

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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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