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1
Colour Television
Chassis
MG2.1 AA
mg21frtp.eps
290798
Service Manual
Content
1. Technical specifications
2
7. Electrical Diagrams and PWB lay-outs
2. Connection facilities, chassis overview
3
Diagram PWB
3. Safety instructions, maintenance,
5
Power Supply
(Diagram A1) 35
36,37
warnings and Notes
4. Mechanical instructions
Line Deflection
(Diagram A2) 38
36,37
7
Frame Deflection / Frame Rotation (Diagram A3) 39
36,37
5. Service modes, DST, error messages,
9
Audio Amplifier
(Diagram A4) 40
36,37
protections, faultfinding and repair tips including:
Errorcodes-table
Mains switch Panel
(Diagram E)
41
41
15
CRT / Scavem Panel
(Diagram F)
42
43
Protection-structure (overview and detailed)
17
Tuner, IF, I/O, Video processing (Diagram K1) 46
44,45
Fault find tree
22
Input / Output
(Diagram K2) 47
44,45
6. Block diagrams
29
Sound processing
(Diagram K3) 48
44,45
Block diagram
29
Audio Dolby
(Diagram K4) 49
44,45
(Supply, Deflection, CRT)
Block diagram
Secam Correction
(Diagram U) 49
49
30
Featurebox 6 (Eco)
(Diagram K5) 50
44,45
(Video, Audio, Control)
Survey of testpoints
Video control & Geometry
(Diagram K6) 51
44,45
31
Teletext & Control
(Diagram K7) 52
44,45
Oscillograms
32
Side I/O Panel
(Diagram O) 53
53
Wiring diagram
33
Top Control Panel
(Diagram P)
54
54
Overview I 2 C -ICs
33
DC Shift
(Diagram G) 54
54
Supply lines overview
34
Diversity tables
55
8. Electrical alignments
57
9. Circuit Descriptions: not available (see Training
Manual)
63
10. Directions for use
64
11. List of abbreviations
75
12. Spare parts list
77
Published by CO 9871 TV 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 permision of Philips.
Subject to modification
5
4822 727 21622
© 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, electron-
ic, mechanical, photocopying, or otherwise without the prior permision of Philips.
Published by CO 9871 TV Service Department Printed in The Netherlands
Subject to modification
5
4822 727 21622
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2
MG2.1E
1 Technical specifications
1 Technical specifications
Mains voltage
: 220V - 240V ( ± 10%);
50-60Hz ( ± 5%)
Aerial input impedance
: coaxial 75 W
Minimal aerial voltage
: 30 m V (VHF), 40 m V
(UHF)
Maximum aerial voltage
: 180 mV
Programmes
: 0-99
VCR programmes
: 0, 90-99
16576852.007.png
2 Specification connections
MG2.1E
3
2.1
Front connections
5 - Blue
v
6 - Audio
L (0.5Vrms ³ 10k W )
j
7 - Blue
(0.7Vpp/75 W )
j
TOP CONTROL FL7/FL8
STYLING
8 - CVBS-
status
0-1.3V:INT
4.5-7V:EXT 16:9
3.5
AUDIO R
9.5-12V:EXT 4:3
j
'IR-
RECEIVER'
AUTO TV
SENSOR
(OPTIONAL)
AUDIO L
SK 1
VIDEO
9 - Green
v
10-
11- Green
'IR-SERVICE-LED'
(0.7Vpp/75 W )
j
BICOLOUR
STANDBY LED
12-
13- Red
CL 86532057_top.AI
310798
v
14- RGB-
status
Figure 2-1
v
15- Red
(0.7Vpp/75 W )
j
2.1.1 Audio/Video
16- RGB-
status
0-0.4V:INT
- Video
1Vpp/75 W
jq
1-3V:EXT/75 W
- Audio
L(0.5Vrms ³ 10k W )
jq
17- CVBS
v
- Audio
R(0.5Vrms ³ 10k W )
jq
18- CVBS
v
- Headpho
ne
19- CVBS
(1Vpp/75 W )
k
(32-600 W³ 10mW)
ot
20- CVBS
(1Vpp/75 W )
j
21- Earth
socket
2.1.2 SVHS
1-
v
2.2.2 External 2 (in/out): SVHS+RGB+CVBS (intended for VCR.)
2-
v
3 - Y
(1Vpp; 75 W )
j
4 - C
(0.3 Vpp;75 W )
j
1 - Audio
R (0.5Vrms £ 1k W )
k
2 - Audio
R (0.5Vrms ³ 10k W )
j
2.2
Rear connections
3 - Audio
L (0.5Vrms £ 1k W )
k
4 - Audio
v
See figure 2.2
5 - Blue
v
6 - Audio
L (0.5Vrms ³ 10k W )
j
2.2.1 External 1(in/out): RGB+CVBS
7 - Blue /
Chroma
out
(0.7Vpp/75 W )
j
8 - CVBS-
status
0-1.3V:INT
4.5-7V:EXT 16:9
9.5-12V:EXT 4:3
j
9 - Green
v
10-
Easy link
11- Green
(0.7Vpp/75 W )
j
12-
13- Red
v
EXTERNAL 3 (OPTIONAL)
14- RGB-
status
L
v
R
AUDIO
EXTERNAL 1
EXTERNAL 2
15- Red /
chroma-
in
CL 86532057_rear.AI
310798
(0.7Vpp/75 W )
j
16- RGB-
status
Figure 2-2
(0-0.4V:INT
1-3V:EXT/75 W )
17- CVBS
v
18- CVBS
v
19- Y/CVBS (1Vpp/75 W )
k
1 - Audio
R (0.5Vrms £ 1k W )
k
20- Y/CVBS (1Vpp/75 W )
j
21- Earth
socket
2 - Audio
R (0.5Vrms ³ 10k W )
j
3 - Audio
L (0.5Vrms £ 1k W )
k
4 - Audio
v
2
Specification connections
SVHS
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4
MG2.1E
2 Specification connections
2.2.3 External 3 (in): CVBS+Audio (optional)
4.5-7V:EXT 16:9
9.5-12V:EXT 4:3
j
1-
2 - Audio
R (0.5Vrms >10k W )
j
9-
10-
11-
12-
13-
14-
15-
16-
17- CVBS
3-
4 - Audio
v
5-
6 - Audio
L (0.5Vrms>10k W )
j
v
18- CVBS
v
7-
8 - CVBS-
status
0-1.3V:INT
19-
20- CVBS
(1Vpp/75 W )
j
21- Earth
socket
F
CRT/SCAVEM PANEL
TOP CONTROL PANEL
P
O
SIDE I/O PANEL
SHIELDING
K
SMALL SIGNAL PANEL
MAINSWITCH PANEL
E
LARGE SIGNAL PANEL
A
CL 86532057_002.eps
170798
Figure 2-3
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3 Safety instructions, Maintenance instruction,
MG2.1E
5
3.1
Safety instructions for repairs
– When the set is used under normal circumstances, for
example in a living room, the recommended interval is 3 to
5 years.
– When the set is used in circumstances with higher dust,
grease or moisture levels, for example in a kitchen, the
recommended interval is 1 year.
– The maintenance inspection contains the following actions:
• Execute the above mentioned 'general repair
instruction'.
• Clean the power supply and deflection circuitry on the
chassis.
• Clean the picture tube panel and the neck of the picture
tube.
1. Safety regulations require that during a repair:
– the set should be connected to the mains via an
isolating transformer;
– safety components, indicated by the symbol D , should
be replaced by components identical to the original
ones;
– when replacing the CRT, safety goggles must be worn.
3.3
Warnings
2. Safety regulations require that after a repair the set must
be returned in its original condition. In particular attention
should be paid to the following points. h
– As a strict precaution, we advise you to resolder the
solder joints through which the horizontal deflection
current is flowing, in particular: ('general repair
instruction')
• all pins of the line output transformer (LOT);
• fly-back capacitor(s);
• S-correction capacitor(s);
• line output transistor;
• pins of the connector with wires to the deflection
coil;
• other components through which the deflection
current flows.
1. In order to prevent damage to ICs and transistors, all high-
voltage flashovers must be avoided. In order to prevent
damage to the picture tube, the method shown in Fig. 3.1
should be used to discharge the picture tube. Use a high-
voltage probe and a multimeter (position DC-V). Discharge
until the meter reading is 0V (after approx. 30s).
2. ESD All ICs and many other semiconductors are
susceptible to electrostatic discharges (ESD). Careless
handling during repair can reduce life drastically. When
repairing, make sure that you are connected with the same
potential as the mass of the set by a wristband with
resistance. Keep components and tools also at this same
potential.
– Available ESD protection equipment:
– anti-static table mat (large 1200x650x1.25mm) 4822
466 10953
– anti-static table mat (small 600x650x1.25mm) 4822
466 10958
– anti-static wristband 4822 395 10223
– connection box (3 press stud connections, 1 M ohm)
4822 320 11307
– extension cable (2 m, 2 M ohm; to connect wristband
to connection box) 4822 320 11305
– connecting cable (3 m, 2 M ohm; to connect table mat
to connection box) 4822 320 11306
– earth cable (1 M ohm; to connect any product to mat or
connection box) 4822 320 11308
– complete kit ESD3 (combining all 6 prior products -
small table mat) 4822 310 10671
– wristband tester 4822 344 13999
– Note:
– This resoldering is advised to prevent bad
connections due to metal fatigue in solder joints
and is therefore only necessary for television sets
older than 2 years.
– The wire trees and EHT cable should be routed
correctly and fixed with the mounted cable clamps.
– The insulation of the mains lead should be checked for
external damage.
– The mains lead strain relief should be checked for its
function in order to avoid touching the CRT, hot
components or heat sinks.
– The electrical DC resistance between the mains plug
and the secondary side should be checked (only for
sets which have a mains isolated power supply). This
check can be done as follows:
• unplug the mains cord and connect a wire between
the two pins of the mains plug;
• set the mains switch to the on position (keep the
mains cord unplugged!);
• measure the resistance value between the pins of
the mains plug and the metal shielding of the tuner
or the aerial connection on the set. The reading
should be between 4.5 M W and 12 M W;
• switch off the TV and remove the wire between the
two pins of the mains plug.
3. Together with the deflection unit and any multipole unit, the
flat square picture tubes used from an integrated unit. The
deflection and the multipole units are set optimally at the
factory. Adjustment of this unit during repair is therefore not
recommended.
4. Be careful during measurements in the high-voltage
section and on the picture tube.
5. Never replace modules or other components while the unit
is switched on.
6. When making settings, use plastic rather than metal tools.
This will prevent any short circuits and the danger of a
circuit becoming unstable.
7. Wear safety goggles during replacement of the picture tube
– The cabinet should be checked for defects to avoid
touching of any inner parts by the customer.
3.2
Maintenance instruction
It is recommended to have a maintenance inspection carried
out by a qualified service employee. The interval depends on
the usage conditions:
3
Safety instructions, Maintenance instruction, Warnings and Notes
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