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SERVICE MANUAL
COLOUR TELEVISION
Power source
AC 220~240V 50Hz
Power consumption(watts) Maximum : 155
Average
: 120
Standby
: 1.5
Television system
CCIR B/G
Colour system
PAL on Air
PAL/NTSC3.58/NTSC4.43 in AV
mode
Channel coverage
E2-E12, E21-E69, S1-S41,
X, Y, Z, Z+1, Z+2,
A-H, H+1, H+2
Sound-multiplex systems
A2 (B/G) system
Teletext systems
FLOF (Fastext), TOP, WST (World
Standard System)
AV terminal
21-pin terminals
AV1: CENELEC Standard with
RGB
AV2: CENELEC Standard with S-
inputs
Front AV terminals
AV3: RCA Terminal, Video and
Audio(L/R) Input
Sound output (watts)
Rated Power output :5.0 x 2
Picture tubes (cm)
66 (measured diagonally)
Headphone jack
Stereo mini-jack (3.5 mm in
diameter)
Speakers (cm)
(5 x 9)oval x 2
Dimensions (WxHxD mm)
736 x 595.5 x 500
Weight (kg)
32.5
Accessories
Remote control handset x 1
AAA/R03 dry cell battery x 2
Specifications subject to change without notice.
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
AV-28BK5ECB
AV-28BK5ECS
1
2
3
4
5
6
7
8
9
0
P
AV
AV
MENU
MENU
P
RM-C80
TV
CS
CS
BASS
BASS
P. MODE
. MODE
/ OK
OK
No. 51758
Oct. 2000
AV-28BK5ECB
AV-28BK5ECS
SPECIFICATIONS:


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AV-28BK5ECB
AV-28BK5ECS
1: An isolation transformer should be connected in the
power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.
2: Comply with all caution and safety-related notes
provided on the cabinet back, inside the cabinet, on
the chassis or the picture tube.
3: When replacing a chassis in the cabinet, always be
certain that all the protective devices are installed
properly, such as, control knobs, adjustment covers
or shields, barriers, isolation resistor-capacitor
networks etc.Before returning any television to the
customer, the service technician must be sure that it
is completely safe to operate without danger of
electrical shock.
2
No. 51758
SAFETY PRECAUTION
X-RADIATION PRECAUTION
The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is specially
constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must
be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous
X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this
service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits,
take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and high
voltage adjustment to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement is made in any area of a receiver.
Components indicated by mark
in the parts list and the schematic diagram designate components in which
safety can be of special significance. It is particularly recommended that only parts designated on the parts list in
this manual be used for component replacement designated by mark
. No deviations from resistance wattage
or voltage ratings may be made for replacement items designated by mark
.
!
!
!
CONTENTS
Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chassis description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ~ 9
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Option Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Service adjustments [Feature Setting] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Service adjustments [Adjustment Mode]-[Adjustment] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 ~ 16
Component locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 ~ 19
CPU port functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 ~ 20
IC block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 ~ 26
Parts description and reading in schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Service parts lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ~ 40
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 ~ 2-17


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No. 51758
3
AV-28BK5ECB
AV-28BK5ECS
This is a basic diagram for all models and therefore differs slightly from the actual block diagram.
RO
M
47
19
20
21
46
45
44
23
24
SCAR
T1
AV
1
SCAR
T2
AV
2
FR
ONT
AV
MONIT
OR-
OUT
SC1
V
-IN
FR
ONT
V
-IN
23
41
1
9
11
27
34
37
39
19
20
SC2
Y
-IN
SC1-IN
PO
WER-ON
KEY
-IN
MUTE
PO
WER
F
A
IL
DETECT
IN
RC
IN
SC2-IN
SC3-IN
SC2
C-IN
IC1201
MM1313BD
TV
-OUT
R/G/B/BLK
SCL/SD
A
IC101
<TD
A9321H>
IF/VIDEO/
CHR
OMA/
MAR
TIX
2
3
36
37
38
39
34
18
20
21
47
61
60
51
50
49
46
CVBS-OUT
Y
-OUT
C-OUT
CVBS-2-IN
R
G
B
BLK
IF
4
5
Aer
ial
T
uner
X132
SAF
Q131
85
90
92
63
68
1
71
70
100
98
6
IC7201
<TC90A36FM>
SCAN
CONVER
TER
Y
U
V
HD
VD
FIELD
MEMOR
Y
IC7202
<MSM518221>
FIELD
MEMOR
Y
IC7203
<MSM518221>
6
8
9
11
14
16
17
19
2Y
-OUT
2U-OUT
2V
-OUT
IC241
<TD
A9178>
IC351
<TD
A9330H>
MA
TRIX
DEFLECTION
28
27
26
23
24
8
44
40
41
42
38
37
36
35
3
10
11
SD
A/SCL
SCL/SD
A
IC801
<ST92R195>
CPU
RG
B
BLK
OSD
BG
R
BLK
IC711
TD
A6101
IC721
TD
A6101
IC731
TD
A6101
B
VIDEO-OUT
G
VIDEO-OUT
R
VIDEO-OUT
35
8
3
5
8
3
5
8
G
B
R
CR
T
IC501
<LA7876>
1
2
H-DRIVE
E-W
Q402
T401A
H-DRIVE
IK
Q271
Q272
Q273
G
R
B
V
DRIVE
-
V
DIR
VE+
PCC
CONTR
OL
CS
CONTR
OL
H-OUTPUT
Q411
FOCUS
SCREEM
T402
FL
YBA
CK
V
H
D.
Y
VER
T
OUTPUT
6
5
3
Y
U
V
VD
HD
AV
SELECT
OR
IC802
I
2
C
B
U
S
2VD-OUT
2HD-OUT
MEMOR
Y
SCL/SD
A
Q381
TV
-OUT
H.V
IC871
2
+
­
Q471-Q461
F
rom
Scar
t
Outline
[Chassis Block Diagrams]
Fig.-1
CHASSIS DESCRIPTION


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4
No. 51758
AV-28BK5ECB
AV-28BK5ECS
IC101
IF/VIDEO/
CHROMA
<TDA9321H>
IC351
MATRIX
<TDA9330H>
IC241
SHARPNESS
<TDA9178>
IC801
CPU
DIGITAL
SCAN
CONVERTER
CIRCUIT
AV
SELECTOR
CIRCUIT
SIF
Filtering
circuit
Buffer
2
3
10
12
13
14
18
20
21
34
36
|
38
61
60
23
40
41
42
38
30-38
24
49
50
51
6
8
9
19
17
16
26
27
28
Y, U, V
2(Y, U, V)
H-Sync
V-Sync
CVBS (TeleText)
2HD
2VD
External RGB in
(AV1 In)
SAW Filter
IF Stage
Video-in
C-in
Y
-in
AV1
AV2
AV3
AV4
3
5
8
IC731
R-VIDEO OUT
<TDA6101Q>
3
5
8
IC721
G-VIDEO OUT
<TDA6101Q>
3
5
8
IC711
B-VIDEO OUT
<TDA6101Q>
R
G
B
IK
RGB OSD
DISPLAY from CPU
Picture Tube
Video signal rooting
SCART1
AV1
SCART2
AV2
SCART2
AV3
FRONT
AV4
L/R
SC3-IN
IC1201
MM1313
42
41
2
4
8
10
14
16
33
32
IC3501
MM1369
3D
SURROUND
PROCESSOR
3D SUPPER
L
SPEAKER
R
SPEAKER
HEADPHONE
JACK
Q001
IC3451
TDA9875
Q3472
Q3471
L
R
23
1
10
9
13
11
6
40
39
12
1
25
26
IC001
TDA7263M
AUDIO
AMP
8
3
10
15
MUTE
4
21
43
44
60
61
23
24
52
53
IC101
TDA9321
SCL/SDA
DIGITAL TV
SOUND
PROCESSOR
L/R
TV-OUT
MONITOR
OUT
SC1-IN
SC2-IN
L/R
Q1241
Q1242
Q1251
Q1252
FROM
CPU
L/R
TV-IN
SIF
MONO
Tuner
Q131
X131
SAF
Aerial
L
R
L
R
L/R
FRONT 4-IN
25
26
L/R
5
63
44
IF/VIDEO/
CHROMA
63
44
5
IF/VIDEO/
CHROMA
+
AV
SELECTOR
19
20
ACTIVE 3D SURROUND PROCESSING
46
47
Audio signal rooting
Fig.-2
Fig.-3
CHASSIS DESCRIPTION


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No. 51758
5
AV-28BK5ECB
AV-28BK5ECS
IC801
CPU
IC871
ROM
CVBS input
Q649
RL649
Power
Supply
Circuit
OSD
RGB
Dr
iv
e
H-Sync
V
-Sync
1
|
5
63
|
80
61
60
48 49 44-47 43
37
25
RC Pre-amp.
I2C BUS
AV1 SW in
AV2 SW in
AV3 SW in
19
20
21
23
24
Key SW
Input
38
Power
Failuer
Detect
Power ON/OFF
DIGITAL
SCAN
CONVERTER
H-Drive
Q401-Q402
T401
Drive Trans
Q411
H-Output
IC501
V-Output <LA78476N>
56
3
V-Drive +
V-Drive -
3
8
2
1
23
24
EW-Out
Q471
Q461
Vert.
Coil
Horiz.
Coil
Deflection
Yoke
T402
FlyBack Trans.
L461/L462
Pcc Control
IC351
MATRIX
DEFLECTION
<TDA9330H>
2H-Sync
2V-Sync
L421
C421/C422
System control
Deflection circuit
Fig.-4
Fig.-5
CHASSIS DESCRIPTION