Sanyo CE28DN7-C Schematic

Part No. SKSM0533 C2WYV JANUARY 2001

Colour Television
Service Manual

Model CE28DN7-C

Service Ref. No. CE28DN7-C-00

PRODUCT CODE: 111351318
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

CE28DN7-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

Please use Schematic Diagram for CE28DN7-C-00.
Part no SKP20350.

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C2WYV

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 BG, DK
Colour system PAL/NTSC4.43 (PAL/NTSC4.43/MTSC3.58 IN AV MODE)
Receiving channel UHF: 21~69

VHF: E2-E12, R1-R12
CATV: X, Y, Z, S1-S41

Aerial input impedance 75ohm

AV terminal

21 Pin SCART Terminal AV1:CENELEC standard with RGB

AV2:CENELEC standard with S-inputs

Front AV AV3:RCATerminal, Video and Audio (L/R)
Sound output(Music) 8W x 2
Dimensions (WxHxD) 854 x 701 x 601mm
Weight 32 Kg

!

!

!

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C2WYV

BLOCK DIAGRAM

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

Outline

IC803

MEMORY

PROTECT-IN

Aerial

PC-IN

SCL
SDA

Q701
Q711
Q721

Q242
Q243
Q244

VIDEO-OUT

R

G

B

R
G
B

CRT

A101

TUNER

Q141

X132

VIF

20

6
7

21
22

IC201

X131

SIF

POWER

26

25

I2C BUS

BLK

44

B

45

G

IC801

24
23

19

CPU

1 - 15

80 - 63

46
47

60
61

R

CVBS-IN

BLK

R
G
B

9

IF/VIDEO/

CHROMA/

34
35

15
16
17
18

26

DEF

54

3

43
39

40
41

32

C
Y

SYNC-IN

EW-OUT

H-OUT

Q431

Q121~Q133

T431

TV-IN

SIF-IN

C-OUT

Y-OUT

Refer also
to FIG.-2.
AV SELECTOR
NICAM DECODER

Q432

TV-OUT

AV1

13
8

15
18

SC-1

SC-2

AV2

MONTO

-OUT

T451

FBT

FOCUS
SCREEN

IC802

ROM

V-OUT IC501

6

PCC

CONTROL

CS

D.Y

H

CONTROL

3

V

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AV Selector
NICAM DECODER

System Control

Fig.-2

Fig.-3

FRONT-AV

SC-1

SC-2

IC201
IF/VIDEO/
CHROMA

IC001

AUDIO-OUT

I2C BUS

K12H

FRONT AV3

MONITOR-OUT

8

(VIDEO/AUDIO-L/R)

(VIDEO/Y/C/AUDIO-L/R)

K12J

(VIDEO)

13

15

C-OUT

18

Y-OUT

8

SIF-IN

5,6

AUDIO L/R-OUT

10,11

K12M

SC-1

SC-2

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)

19

20

SDA/SCL

(V)34

MONITOR-OUT

31

29

33
32

Y-OUT

37

C-OUT

38

Y-IN

C-IN

L-OUT

R-OUT

Q1204/1207

Q1205

Q1203

Q1202

AUDIO-OUT

IC3451
NICAM

37

&

36

STEREO

<TDA9875>

12

60
61

4
5

I2C BUS

CONTROL

IC803

MEMORY

RC-IN

SDA

POWER-FAIL

DETECT

SCL

POWER

25 31 28

24
23

43

1 - 7, 63 - 80

KEY-IN

IC801

CPU

IC802

ROM

Relay SW

39

44
45

46

BLK-OUT
B-OUT
G-OUT
R-OUT

36

37

60
61

SC1(AV1) 8-pin
SC2(AV2) 8-pin

Q806

CVBS

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C2WYV

Deflection Control

IC501

V-Output<LA7833>

IC201

IF/VIDEO/

DEFLECTION

<TB1251>

41

EW-Out

63

Deflection

Yoke

26

32

V-Drive

Q431

H-Drive

Q431

H-Output

T431

Drive Trans

Vert.

Coil

Horiz.

Coil

T451

FlyBack Trans

L461/L462

Pcc Control

Q462

Q461

-6-

C2WYV

CABINET DISASSEMBLY

CABINET BACK DISASSEMBLY

1. Remove 7 screws(A).

2. Pull out the cabinet back.

(A)

(A)

(A)

(A)

(A)

(A)

(A)

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C2WYV

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. Set the options as shown below.

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 AUTO TUNE/SORT Tuning mode, default “AUTO TUNING”

or AUTO TUNING

or A TS EURO PLUS
PLUG & PLAY ON or OFF Plug & Play mode, default “ON”
WELCOME TEXT ON or OFF Display message when first set up, default “OFF”
CODE TEST OFF or ON For factory use, default “OFF”
WSS ON or OFF Wide Screen Signaling available, default “ON”
WIDE ON or OFF Wide mode, default “ON”
OPTION 4 or 7 LANGUAGE Language option , default “4 LANGUAGE”
312/313 Mode ON or OFF Teletext mode, default OFF
AV3 OPTION ON or OFF Front AV disable, default ON
3D SURROUND ON or OFF 3D Surround available, default ON
SIF OPTION BG, I, L/L’ or BG or BG/DK Television default system, Default “BG, I, L/L’”

OPTION SETTINGS FOR CE28DN7-C-00

OPTION

ON-TIMER ON
SORT MODE
PLUG & PLAY
WELCOME TEXT
CODE TEST
WSS
WIDE
OPTION
312/313 Mode
AV3 OPTION
3D SURROUND
SIF OPTION
AUTO VOLUME

ADJUST : EXIT : RECALL

AUTO TUNING

ON
ON

OFF

ON

OFF

4 LANGUAGE

ON
ON
ON

BG + DK

OFF

?

-8-

C2WYV

SERVICE ADJUSTMENTS

[After replacing the Memory IC (IC803)]

The memory IC, IC803, stores the service adjustments data for each circuit, therefore, when the memory IC is
replaced, it should be programmed by using “OPTION SETTING” on previous page.

ADJUSTABLE SERVICE ADJUSTMENT

REGULAR

WIDE

To enter to the Service Mode

+ Press and hold the GREEN button on the remote control and then press the P▼ button inside of the door. The

adjustment window will appear on the screen.

IMPORTANT NOTICE

Do not attempt to adjust service adjustments not listed above otherwise it may cause loss of
performance and product safety.

Item No. OSD Description

1 P V-P Vertical Centre Adjustment
2 P H-P Horizontal Centre Adjustment
5 P V-S Vertical Size Adjustment
6 P H-S Horizontal Size Adjustment
7 P PCC Pcc Adjustment
8 P TRP Trapezoid Distortion Adjustment
10 P CNR Corner Adjustment

Item No. OSD Description

1 AGC AGC Adjustment
2 CUT Cut-Off Drive Adjustment
3 GRY G-Drive Adjustment
4 GRY B-Drive Adjustment
8 OSD OSD Positioning Adjustment

Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the
adjustments are carried out by using the RC handset.

ADJUST

REGULAR
WIDE
OTHERS
TB1251

SELECT:
EXIT : RECALL

OK

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C2WYV

To select the mode and service item and change data value

+ Highlight the desired adjustment mode by using the P▲ or P▼ button and then press the F/OK button.
+ To select the adjustment item, use the P▲ or P▼ button.

+ To change the service data, use the Volume -(LEFT) or Volume + (RIGHT) button.
+ The data which is set in the service mode is stored into the memory IC automatically.

Exit from the Service Mode

+ Press the RECALL button or turn off the TV set by using the Mains switch.

INITIALISATION OF MEMORY IC

To initialise the memory IC (IC803), press and hold the NORMAL button on the remote control and then press
the P▲ button on the front panel of the TV set, and then turn the Mains switch Off and On. Now the initialisation is
completed.
When the memory IC is initialised, all of the service data (option data and service adjustment data) stored in the IC
are reset to the default value. It is necessary to readjust the service adjustments listed on pages 7 & 8.

REGULAR mode

WIDE mode

REGULAR
1, AGC 38

Adjustment No.
and Item name

Adjustment Data

Adjustment No.
and Item name

WIDE

1. P V-P 1F

Adjustment Data

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C2WYV

ADJUSTMENTS

IMPORTANT NOTICE

Do not attempt to adjust the following service adjustments except when adjustments are required in servicing
otherwise it may cause loss of performance and product safety.

1. Receive white raster pattern.

2. Set controls to normal.

3. Connect digital voltmetre to test point TP-B and GND.

4. Adjust voltage to 150 ±0.5V by using VR641.

1. Input and tune an RF signal which is UHF to the clear­est station.

2. Connect digital voltmetre to test point TP-A and GND.

4. Enter to the service mode and select mode “REGU-

LAR”, and select item no.1 “REGULAR 1, AGC”.

5. Press the LEVEL+ or LEVEL - button to adjust volt-

age to be 3.2Vdc.

By using FOCUS VR, adjust focus control for well
defined scanning lines.

SCREEN ADJUSTMENT

1. Receive black & white pattern.

2. Enter to the service mode and select mode “REGU-

LAR”, and select item no. 2 “REGULAR 2, CUT”. The
horizontal line will appear on the screen.

3. Set the SCREEN VR for one colour to be just visible.

4. Using the numeric buttons shown set each colour to

minimum by decreasing to the point where any further
decrease resets the adjustment to maximum value.

BIAS ADJUSTMENT

5. By using the buttons 1, 2, 4, 5, 7, 8 on the remote

control, adjust the line to be white.

The key allocation is as follows;

Button No. Operation

1 Increase Red
2 Decrease Red
4 Increase Green
5 Decrease Green
7 Increase Blue
8 Decrease Blue

DRIVE ADJUSTMENT

6. Select item no.3 “REGULAR 3, GRY” (G-Drive) or 4
“REGULAR 4, GRY” (B-Drive) and adjust both initially
to 3F.

7. Change data value of each item by using

LEVEL + or

LEVEL - button to obtain the proper white balance.

PCC ADJUSTMENT

1. Receive cross hatch pattern and set screen mode to

“FULL”.

2. Enter to the service mode and select mode “WIDE”,

and select item no. 7 “WIDE 7.P PCC”.

3. Press the LEVEL+ or LEVEL - button to adjust the
vertical line to be straight.

TRAPEZOID ADJUSTMENT

1. Receive cross hatch pattern and set screen mode to

“FULL”.

2. Enter to the service mode and select mode “WIDE”,

and select item no. 8 “WIDE 8.P TRP”.

3. Press the LEVEL+ or LEVEL - button to correct the
trapezum distortion of the vertical line.

PCC ADJUSTMENT

GREY SCALE ADJUSTMENT

FOCUS ADJUSTMENT

AGC ADJUSTMENT

+ B VOLTAGE ADJUSTMENT