Sanyo CE28FWN4F-C Schematic

Part No. SKSM0647 C6AFL MARCH 2003

Colour Television
Service Manual

Model CE28FWN4F-C

Service Ref. No. CE28FWN4F-C-00

CE28FWN4F-C-01

PRODUCT CODE: 111366005
ORIGINAL VERSION: Chassis No. EB7-A

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

CE28FWN4F-C

Contents

Safety precautions/Specifications ..................................................................................................................2

Block diagrams ..............................................................................................................................................3

Cabinet Disassembly......................................................................................................................................4

Adjustment and Repair Procedures............................................................................................................5~9

CPU Functions ..............................................................................................................................................................................10~1 1

Component Locations ..................................................................................................................................12

IC Block Diagrams..................................................................................................................................13~15

Pin description of semiconductors................................................................................................................16

Part Description and reading of schematic diagram ....................................................................................17

Cabinet Parts List/TV Stand parts list ..........................................................................................................18

Electric Parts List....................................................................................................................................19~26

Please use Schematic Diagram SKP20430 with
this Service Manual.

-3-

C5AJL

BLOCK DIAGRAM

This is a diagram for all models and therefore differs slightly from the actual block diagram.

Outline

AERIAL

IC3451

NICAM/

60 61

IF

A101

TUNER

X132

STEREO

12

5
4

IF-IN

80

26

71

SIF-OUT

SCL

SDA

SCL

K1001

SCART SC1

79

SDA
SCL

X131

SIF-IN

19

IC1201

76

75

20

Video-IN

R/G/B-IN

Video/Y-Out

9816

AV-VIDEO-SW <LA7954>

Video-Out

48

54

IC201

IF/VIDEO/CHROMA/DEF

<TB1251>

22

27

SDA

20

23

21

11/7/15

15

C-IN

46

33

EW-OUT

SCART SC2

20

Y-IN

Video/

Y-IN

C-IN

58

47

V-OUT

K1002

C-OUT

61

39

H-OUT

19

M-OUT
R

51/53

R

Q462

15

C-IN

R/G/B-IN

2/5/12

1/3/13

12

13

4

14

G

B

575655

121314

B

G

Q461

7/11/15

15

IC1401

RGB-SW

<TC4053BF>

L461

L462

6

R/G/B-OUT

3

TUBE

PICTURE

B

R

G

Q701

Q721

Q711

T451 FLYBACK

CRT

HEATER

Q432

H-OUTPUT

Q431

H.V

FOCUS/SCREEN

200V

D.Y

A1901

1 5

8/10

MUTE

CPU

IC801

RC RECEIVER

1

RC-IN

KEY SW

IC001

AUDIO-OUT

<TDA7263M>

BLK

45

181716

8

KEY-IN

SDA

C BUS

2

I

R

G

SCL

CONTROL

B

H-BLANK

4

15

19

SDA

IC803

MEMORY

20

SCL

D441

IC501

<LA7846>

V-OUTPUT

Q682

Q685

Q686

27V

145V

Reg.

Q651

25V

14

11

18

Q641

Q642

12

13

10

Q645

Q643

-27V

D646

D641

9V

IC642

WIDTH

SCREEN

CONTROL

POWER

D647

5V-1

IC643

Q661

15

D637

34

33

53

54

11

21

PROTECT

5V

5V

Q666

IC641

T611

3

Q611

D615

CONVERTER

5

8

C607

2

Q613

SP902

SP901

SPEAKER

D603-D606

SW901

AC

C6AFL

-5-

OPTION SETTING

[After replacing the Memory IC (IC803)]

The memory IC, IC803, stores the option data of TV set and service adjustments data for each circuit, therefore,
when the memory IC is replaced, it should be performed following setting and “SERVICE ADJUSTMENT” on next
page.

To enter to the Option Mode

+ Press and hold the F/OK button on the remote control and P▼ button on the front panel of the TV. The option

window will appear on the screen.

To set the option mode

+ Highlight the desired option item by using the P▲ or P▼ button .
+ To switch the option mode, use the Volume - (LEFT) or Volume + (RIGHT) button.

+ The data which is set in the option mode is stored into the memory IC automatically.

Following table shows the available option items and default setting mode.

Exit from the Service Mode

+ Press the RECALL button.

Option Mode Mode Description & Note

ON-TIMER ON or OFF On-timer available, default “ON”
SORT MODE SORTING or Tuning mode, default “SORTING”

TUNING
P & P ON or OFF Plug & Play mode, default “ON”
WEL. TEXT ON or OFF Display message when first set up, default “ON”
COMB FILTER OFF or ON For factory use, default “OFF”
BBE ON or OFF BBE sound mode, default “OFF”
AUTO VOLUME ON or OFF Default “OFF”
HEADPHONE ON or OFF Headphone control , default “OFF”
COUNTRY UK, IRE TV system, default “BG/DK / I / L/L’”

BG/DK / I / LL’
WIDE ON or OFF Wide mode, default ON
AV3 ON or OFF Front AV disable, default “ON”

OPTION MODE FOR CE28FWN4F-C-00

?

OPTION

ON-TIMER ON
SORT MODE SORTING
P&P ON
WEL. TEXT ON
COMB FIL TER OFF
BBE OFF
AUT O VOLUME OFF
HEADPHONE OFF
COUNTRY BG/DK / I / L/L'
WIDE ON
AV3 ON

ADJUST : EXIT : RECALL