Philips L9.1A Service Manual
Colour Television Chassis
L9.1A
AA 00.02
5555
In the 21PT3942 and the two new 21” sets, 21PT3956 & 21PT3962,
the mono-carrier PCB-layout L9.1A is introduced to increase the
audio power.
Entering the SDM has changed. By connecting pin 20 to ground at
cold start.
Entering the SAM has changed. Shorting pin M28 and M29 is no
longer valid.
For the 21PT3942 one new panel is added:
• Side AV panel & Headphone (E1)
For the 21PT3956 & 21PT3962 two new panels are added:
• Side AV panel & Headphone (E1)
• Top Control RF (T)
For reference see Service Manual L9.2A - 4822 727 21704.
In the new 34” sets, 34PT4873 & 34PT4822, two new panels are
introduced:
• Side AV panel & Headphone (E1)
• Top Control FSQ (T1)
For reference see Service Manual L9.1A - 4822 727 21705.
©
Copyright 2000 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.
Published by RB 0069 Service PaCE Printed in the Netherlands Subject to modification 5 3122 785 40240
GB 2 L9.1A
Electrical diagrams and PWB’s
Side AV panel & headphone
123456
SIDE AV PANEL & HEADPHONE
A
B
C
To 0227
0252
of
or
D
VIDEO IN
0250-C
1
2
0250-A
3
4
0250-B
Electrical diagrams and PWB’s
2
RIGHT
LEFT
3
1
8
9
7
5
6
4
9152
RES
SG02
SG04
SG03
6161
2173
2174
RES
RES
3155
BZX79-C6V8
9153
RES
3153
8K2
3152
3151
8K2
3150
75R
10K
10K
2172
2171
330p
330p
9155
(FOR ESD)
0232 E4
0250-A C3
0250-B D3
0250-C B3
0251 C5
0252 D2
0253 B5
0254 E2
0255 E5
A
0261 D5
2171 D4
2172 C4
2173 C4
2174 D4
2176 F3
2177 F3
2178 F3
2179 E3
B
C
D
3150 D4
3151 D4
3152 C4
3153 C4
3155 B4
3156 E3
3157 F3
6161 B3
9152 D3
9153 C4
9155 C5
SG02 B3
SG03 D3
SG04 C3
SG06 F4
SG07 F4
0253
To 0229
0251
0261
of
or
To 0260
of
To 0262
of
3
2
1
1
2
3
1
2
3
4
5
6
E
HEADPHONE
0254
L-
5
L+
GND
4
3
R+
2
R-
1
To
speaker
F
G
2179
2177
100u
100u
*
3156
3157
3156
*
330R
3157
*
330R
EUROPE
330R
330R
330p
2178
330p
2176
AP/INDIA/LATAM
SG07
SG06
120R
120R
1
0232
6
5
4
2
3
7
8
9
0255
4
3
2
1
To
Speakers
L+
L-
R-
R+
To 0217
of
H
CL 06532025_020.eps
310300
E
F
G
H
123456
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