Part No.
SKSM0484
C3SEV
JULY 2001
Colour Television
Service Manual
Model CE28B5-C
Service Ref. No. CE28B5-C-00
PRODUCT CODE: 111354504
ORIGINAL VERSION: Chassis No. EB6-B
Give complete "SERVICE REF. NO." for parts
order or servicing, it is shown on the rating sheet
on the cabinet back of the TV set.
Note
This TV receiver will not work properly in foreign
countries where the television transmission
system and power source differ from the design
specifications. Refer to the specifications for the
design specifications
CE
28B5-C
Contents
Safety precautions/Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Block diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3~5
Cabinet Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Adjustment and Repair Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7~11
CPU Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12~13
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14~15
IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16~20
Pin description of semiconductors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Part Description and reading of schematic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electric Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24~31
-2-
C3SEV
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
SPECIFICATIONS
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
.
!
!
!
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.
Power source
AC 220~240V, 50Hz
Television system
System B/G
Colour system
PAL/NTSC4.43 (PAL/NTSC4.43/MTSC3.58 IN AV MODE)
Receiving channel
UHF: #21~69
VHF: E2-E12
Aerial input impedance
75ohm
AV terminal
21 Pin SCART Terminal
AV1:CENELEC standard with RGB
AV2:CENELEC standard with S-inputs
Front AV
AV3:RCA Terminal, Video and Audio (L/R)
Sound output(Music)
12W x 2
Dimensions (WxHxD)
736 x 597 x 494mm
Weight
32 Kg
-3-
C3SEV
BLOCK DIAGRAM
This is a diagram for all models and therefore differs slightly from the actual block diagram.
IC801
CPU
IC803
MEMOR
Y
SCL
SD
A
IC802
RO
M
IC201
IF/VIDEO/
CHR
OMA/
DEF
Q242
Q243
Q244
Q701
Q711
Q721
VIDEO-OUT
CR
T
R
G
B
R
G
B
Q121~Q133
TV
-OUT
SIF-IN
C-OUT
Y
-OUT
13
8
15
18
AV
1
AV
2
TV
-IN
SC-1
SC-2
MONT
O
-OUT
X132
X131
VIF
SIF
6
7
9
34
35
15
16
17
18
26
T451
FBT
V
H
D.
Y
PCC
CONTR
OL
CS
CONTR
OL
Q432
Q431
H-OUT
EW
-OUT
43
39
40
41
32
3
54
22
21
20
V
-OUT
IC501
3
6
C
Y
SYNC-IN
BLK
R
G
B
I
2 C
B
U
S
BLK
B
G
R
CVBS-IN
61
60
47
46
45
44
25
26
24
23
19
1
-
15
80
-
63
T431
PR
O
TECT
-IN
PC-IN
PO
WER
Q141
A101
TUNER
Aer
ial
FOCUS
SCREEN
Ref
er
also
to
FIG.-2.
A
V
SELECT
OR
NICAM
DECODER
Outline
-4-
C3SEV
IC1201
AV-SELECTOR
<MM1313>
1(V)
2(L)
4(R)
13(V)
14(L)
16(R)
7(V)
8(L)
9(Y)
10(R)
11(C)
41(V)
(V)34
31
29
33
32
37
38
MONITOR-OUT
Q1202
Q1203
Y-IN
C-IN
FRONT AV3
MONITOR-OUT
SC-1
(VIDEO/AUDIO-L/R)
SC-2
(VIDEO/Y/C/AUDIO-L/R)
SC-1
SC-2
K12J
FRONT-AV
K12H
L-OUT
R-OUT
IC3451
NICAM
&
STEREO
<TDA9875>
37
36
12
60
61
4
5
C-OUT
Y-OUT
SIF-IN
AUDIO L/R-OUT
AUDIO-OUT
IC201
IF/VIDEO/
CHROMA
IC001
AUDIO-OUT
SDA/SCL
(VIDEO)
Y-OUT
C-OUT
Q1205
Q1204/1207
I
2C BUS
AV Selector
NICAM DECODER
IC801
CPU
25
26
28
40
24
23
19
61
60
47
46
45
44
1 - 7, 63 - 80
PO
WER
KEY
-IN
RC-IN
MUTE
BLK-OUT
B-OUT
G-OUT
R-OUT
Q806
CVBS
POWER-FAIL
DETECT
SCL
SDA
IC803
MEMORY
I
2C BUS
CONTROL
IC802
ROM
System Control
Fig.-2
Fig.-3
-5-
C3SEV
IC201
IF/VIDEO/
DEFLECTION
<TB1251>
26
41
32
V-Drive
H-Drive
Q431
IC501
V-Output<LA7846>
63
Q462
Deflection
Yoke
Horiz.
Coil
Vert.
Coil
T451
FlyBack Trans
CS SW
Screen Width Control
Pcc Control
Q461
D441
T431
Q431
H-Output
Drive Trans
L461/L462
EW-Out
Deflection Control