Sanyo CE28D6-C Schematic

Part No. SKSM0481 C2WEV JUNE 2001

Colour Tele vision
Ser vice Manual

Model CE28D6-C

Service Ref. No. CE28D6-C-00

PRODUCT CODE: 111351304
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. Refe r t o the specifications for the
design specifications

CE28D6-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

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C2WEV

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 par ts 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 primar y 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, D/K
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, Z+1, Z+2, S1-S41

Aerial input impedance 75ohm

AV terminal
21 Pin SCART Ter minal AV1:CENELEC standard with RGB

AV2:CENELEC standard with S-inputs
Front AV AV3:RCATerminal, Video and Audio (L/R)
Sound output(Music) 12W x 2
Dimensions (WxHxD) 736 x 597 x 494mm
Weight 32 Kg

!

!

!

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C2WEV

BLOCK DIAGRAM

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

Outline

FOCUS

SCREEN

V

AV1

AV2

FBT

T451

D.Y

H

Q701

Q711

R

Q721

R

VIDEO-OUT

Q242

20

CRT

B

G

G

Q243

21

VIF

X132

B

6

Q244

22

7

IC201

X131

TV-OUT

Q121~Q133

54

9

SIF

SC-1

8

13

SIF-IN

TV-IN

3

DEF

IF/VIDEO/

CHROMA/

34

35

C BUS

2

I

MONTO

SC-2

15

18

Y-OUT

C-OUT

Y

C

SYNC-IN

43

394041

1516171826

B

R

G

BLK

-OUT

Refer also

EW-OUT

to FIG.-2.

AV SELECTOR

NICAM DECODER

H-OUT

32

Q432

T431

Q431

PCC

CONTROL

CS

CONTROL

3

6

V-OUT IC501

Aerial

A101

TUNER

Q141

POWER

PC-IN

CPU

24

23

SDA

IC803

MEMORY

CVBS-IN

61

60

PROTECT-IN

1 - 15

19

80 - 63

ROM

IC802

B

R

G

BLK

26

25

44

45

46

47

IC801

SCL

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C2WEV

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

SC-1

(VIDEO/AUDIO-L/R)

SC-2

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

K12J

(VIDEO)

C-OUT

Y-OUT
SIF-IN

AUDIO L/R-OUT

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)

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

Q1202

AUDIO-OUT

Q1203

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 26 28

24

23

19

1 - 7, 63 - 80

KEY-IN

IC801

CPU

MUTE

40

44
45

46
47

60
61

Q806

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

CVBS

IC802

ROM

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C2WEV

Deflection Control

IC501

V-Output<LA7846>

IC201

IF/VIDEO/

DEFLECTION

<TB1251>

41

EW-Out

63

Deflection

Yoke

26

32

V-Drive

Q431

H-Drive

Q431

H-Output

T431

Drive T r ans

Vert.

Coil

Horiz.

Coil

T451

FlyBack Trans

L461/L462

CS SW

D441

Screen Width Control

Q462

Q461

Pcc Control

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C2WEV

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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C2WEV

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 win-

dow 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 TUNE/SORT”

or AUTO TUNE

or ATS EURO PLUS
PLUG & PLAY ON or OFF Plug & Play mode, default “ON”
WELCOME TEXT ON or OFF Display message when first set up, default “ON”
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 UK or IRELAND Destination option , default “UK”
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

OPTION

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

ADJUST : EXIT : RECALL

ATS EURO PLUS

ON
ON
OFF

ON
OFF

ALL LANGUAGE

OFF

ON

ON

BG ONLY

?

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C2WEV

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 performed “OPTION SETTING” on previous page and the following adjustments, refer to
further adjustment on page 14.

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 on the above otherwise it may cause
loss of performance and product safety.

Item No. OSD Description

1 P V-P Ver tical Centre Adjustment
2 P H-P Horizontal Centre Adjustment
5 P V-S Ver tical 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-Dr ive Adjustment
4 GRY B-Dr ive Adjustment
7 HBP H-Blanking Phase 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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C2WEV

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 te 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 initialised the memory IC, all of the setting data (option data and service adjustment data) stored in the IC are
reset to the default value. So it is necessar y to set the option settings and readjust the service adjustments listed on
left page.

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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C2WEV

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 nor mal.

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 ser vice mode and select mode “REGU-

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

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

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 ser vice 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 ser vice 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 ser vice 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