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Part No. SKSM0711 C5VRL JUNE 2004

Colour Television

Service Manual

Model CE25DN9-B

Service Ref. No. CE25DN9-B-01

PRODUCT CODE: 111360913

ORIGINAL VERSION: Chassis No. EB8-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

CE25DN9-B

Contents

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

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

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

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

CPU Functions ..............................................................................................................................................................................10~11

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....................................................................................................................................19~24

Please use Schematic Diagram SKP20435

inserted with this Service Manual.

Part No. SKSM0720 C7WAS JULY 2004

Colour Television

Service Manual

Model CE28DN9-B

Service Ref. No. CE28DN9-B-01

PRODUCT CODE: 111373100

ORIGINAL VERSION: Chassis No. EB8-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

CE28DN9-B

Contents

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

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

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

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

CPU Functions ..............................................................................................................................................................................10~11

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

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

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

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

Cabinet Parts List ........................................................................................................................................18

Electric Parts List....................................................................................................................................19~24

Please use Schematic Diagram SKP20443

inserted with this Service Manual.

-2-

C7WAS

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 I

Colour system PAL/NTSC4.43 (PAL/NTSC4.43/NTSC3.58 IN AV MODE)

Receiving channel UHF: #21~69

Aerial input impedance 75ohm

Rear AV terminal

AV1: CENELEC standard

INPUT: Composite video, RGB and Audio L/R

OUTPUT: TV-output with composite video and audio L/R

AV2: CENELEC standard

INPUT: Composite video, RGB, S-VHS and Audio L/R

OUTPUT: Monitor output with composite video and Audio L/R

Front AV terminal

AV3: RCA jacks

INPUT: Composite video and Audio L/R

Sound output(Music) 5 x 2

Dimensions (WxHxD) 736 x 597 x 494mm

Weight 30.7Kg

-3- C7WAS

BLOCK DIAGRAM

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

IC601

TN6Q04

C609

D610

14v IC645

5v

P.F

2

4

1

25v

D671

7v

3v3

ON/OFF

UOC PIN 107

Q651

Q642

+14v

-14v

Q625

Q682

145v

Q641

Q675 St-BY UOC

PIN 106

AC

A101

TUNER

X122

X121

5v30v

5

A1901

RC RECEIVER

PF

Q866

IC001

AUDIO AMPLIFIER

SPEAKER

SP901

SP902

KEY SW

IC801

MEMORY

1V8_1 Q202 Q201

1V8_2 Q203

Q204

TO UOC PINS

93 & 96

TO UOC PINS

3,100,117,118,124

UOC

Q1001

Q1002

SC_1 B-IN

SC_1 G-IN

SC_1 R-IN

SC1 FB IN

K1001

SCART 1

SC_1 VIDEO OUT

SCART 1 AUDIO L/R IN

SCART 1 AUDIO L/R OUT

SC_1 VIDEO IN

Q1003

Q1004

SCART 2 AUDIO L/R IN

SCART 2 AUDIO L/R OUT

K1101

AV3 AUDIO L/R & VIDEO IN

145V

Q439

Q431 Q432

L461

L462

Q462

Q461

HORIZONTAL

SCAN COIL

D441

Q402

Q403

ON/OFF CONTROL

CPU PIN 106

200v

To CRT

Q401

T451 FLYBACK

CRT

Heater

IC7 01

SCREEN & FOCUS

H.V

R OUT

GOUT

BOUT

IK

PICTURE TUBE

VERTICAL

SCAN COIL

V-OUTPUT

LA78045

IC501

X201

I2C BUS CONTROL

14

10

9

106

107

11

9

22 23 2

128

48

75

72

71

70

51

53

54

84 85 86

6

58

62

63

SC_2 FB -IN

SC_2 G -IN

SC_2 B- IN

SC_2 R-IN

K1002

SCART 2

SC_2 VIDEO OUT

SC_2 VIDEO IN

49

50

43

55

34

35

36

37

108 109

120

31

127 60 61 97

29

30

80

79

78

77

24

25 IF IN

SIF IN

SW601

T611

CONVERTER

IC666

3v3 St-By

Outline

-4-

C7WASÍ

(A) (A)

CABINET DISASSEMBLY

CABINET BACK DISASSEMBLY

1. Remove 9 screws(A) for 28”

2. Pull out the cabinet back.

(A)

(A)

(A)

(A)

(A)

(A)

(A)

-5- C7WAS

OPTION SETTING

[After replacing the Memory IC (IC801)]

The memory IC, IC801, stores the option data of TV set and service adjustments data for each circuit, therefore,

when the memory IC is replaced, it should be programmed to the following settings and “SERVICE ADJUSTMENT”

on pages 6 to 9.

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.

The following table shows the available option items and default setting mode.

Exit from the Service Mode

+ Press the MENU button.

Option Mode Mode Description & Note

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”

AUTO VOLUME ON or OFF Auto volume default “OFF”

SURROUND ON or OFF Surround sound default “ON”

VIRT SUB WOOFER ON or OFF Virtual Sub Woofer default “ON”

COUNTRY UK or IRE or TV system, default “UK”

BG/DK / I / LL’

WIDE ON or OFF Wide mode, default ON

AV3 ON or OFF Front AV disable, default “ON”

TEXT NO SIGNAL ON or OFF Disables Text when no signal, default “ON”

AFC ON or OFF Auto Frequency Control default “OFF”

SORT MODE SORTING

P&P ON

WEL.TEXT ON

AUTOVOLUME OFF

SURROUND ON

VIRT SUBWOOFER ON

COUNTRY UK

WIDE ON

AV3 ON

TEXT NO SIGNAL ON

AFC OFF

OPTION

ADJUST : EXIT : RECALL

OPTION MODE FOR CE28DN9-B-01

i

/

-6-

C7WAS

SERVICE ADJUSTMENTS

After replacing the Memory IC (IC801)]

The memory IC, IC801, 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 and the following adjustments.

ADJUSTABLE SERVICE ADJUSTMENT

Service Item Number. Symbol 1 Symbol 2 Frequency Wide Mode

13 A01 Track. mode 50Hz Full Track. Mode(HCO)

14 A02 Vert. Zoom 50Hz Full Vertical zoom

15 A03 Vert. Slope 50Hz Full Vertical slope

16 A04 Vert. Shift 50Hz Full Vertical shift

17 A05 Vert. Ampl. 50Hz Full Vertical amplitude

18 A06 S-Corr. 50Hz Full S-correction

19 A07 V.Lin.Ctrl. 50Hz Full V.Lin.Ctrl.

20 A08 V.Linearity 50Hz Full V.Linearity

21 A09 EW Width 50Hz Full EW width

22 A10 Hor. Shift 50Hz Full Horizontal shift

23 A11 EW Parabola 50Hz Full EW parabola/width

24 A12 Trapezium 50Hz Full EW trapezium

25 A13 UC Parabola 50Hz Full EW upper corner parabola

26 A14 LC Parabola 50Hz Full EW lower corner parabola

27 A15 Hor. Bow 50Hz Full Horizontal bow

28 A16 Parallel 50Hz Full Horizontal parallelogram

29 A17 Vert. Scroll 50Hz Full Vertical Scroll

30 A18 H BLK SW 50Hz Full RGB blanking mode

31 A19 H BLK L 50Hz Full Timing of wide blanking front(WBF)

32 A20 H BLK R 50Hz Full Timing of wide blanking rear(WBR)

33 A21 OSVE 50Hz Full Black current measuring lines in overscan

34 A22 EVB 50Hz Full Extended vertical blanking

35 B02 Vert.Zoom 50Hz Natural / or 4:3 squeeze mode Vertical zoom

36 B09 EW Width 50Hz Natural / or 4:3 squeeze mode EW width

37 B10 Hor. Shift 50Hz Natural / or 4:3 squeeze mode Horizontal shift

38 B11 EW Parabola 50Hz Natural / or 4:3 squeeze mode EW parabola/width

39 B12 Trapezium 50Hz Natural / or 4:3 squeeze mode EW trapezium

40 B13 UC Parabola 50Hz Natural / or 4:3 squeeze mode EW upper corner parabola

41 B14 LC Parabola 50Hz Natural / or 4:3 squeeze mode EW lower corner parabola

42 B15 Hor. Bow 50Hz Natural / or 4:3 squeeze mode Horizontal bow

43 B16 Parallel 50Hz Natural / or 4:3 squeeze mode Horizontal parallelogram

44 B17 Vert.Scroll 50Hz Natural / or 4:3 squeeze mode Vertical Scroll

Explanation

Item No. OSD Description

7 VG2 Screen adjustment

151 WPR - N R - Drive adjustment

152 WPG - N G - Drive adjustment

304 AGC Take Over AGC adjustment

314 TXT - H - POS OSD Positioning adustment

IMPORTANT NOTICE

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

GEOMETRY SERVICE DATA

-7- C7WAS

To enter to the Service Mode

+ Press and hold the GREEN button on the remote control and then press the P▼button on the cabinet.

To select the service item and change data value

+ 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.

SERVICE MODE

SERVICE SERVICE SOFTWARE

ITEM ITEM VERSION

NUMBER DESCRIPTION

Exit from the Service Mode

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

INITIALISATION OF MEMORY IC

To initialise the memory IC (IC801), press and hold the NORMAL button on the remote control, then press

the P▼button on the front panel of the TV set. The tv set will switch into standby mode. Turn the Mains switch Off

and On, then switch on from standby. The initialisation is now completed.

When initialised the memory IC and all of the setting data (option data and service adjustment data) stored in the IC

are reset to the default value. It is necessary to set the option settings and readjust the service adjustments listed in

this manual and to re-tune all the channels.

SERVICE

000 EB8A 3_52

-8-

C7WAS

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 clear-

est station.

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

4. Enter the service mode and select item no. 304. AGC

TAKE OVER

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 and white pattern.

2. Enter the service mode and select item no. 7. VG 2

3. Turn screen VR from min to max. OSD will change

from below to above. Turn back until below appears

and then stop turning.

DRIVE ADJUSTMENT

6. Select item no.151. WPR - N (R-Drive) or 152. WPG -

N (G-Drive) and adjust both initially to 20.

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 the service mode and select item no. 23. EW

PARABOLA

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 the service mode and select item no. 24.

TRAPEZIUM

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

-9- C7WAS

CORNER ADJUSTMENT

1. Receive cross hatch pattern and set screen mode to

“FULL”.

2. Enter the service mode and select item no. 25. UC

PARABOLA for top corner adjustment OR item no.

26. LC PARABOLA for bottom corner adjustment.

3. Press the LEVEL+ or LEVEL - button to correct the

distortion of the vertical line around the corners.

HORIZONTAL CENTRING ADJUSTMENT

1. Receive circular pattern and set screen mode to

“FULL”.

2. Enter the service mode and select item no. 22. HOR.

SHIFT.

3. Press the LEVEL+ or LEVEL - button to adjust the

horizontal centre.

HORIZONTAL WIDTH ADJUSTMENT

1. Receive circular pattern and set screen mode to

“FULL”.

2. Enter to the service mode and select item 21. EW

WIDTH.

3. Press the LEVEL+ or LEVEL - button to adjust the

horizontal width.

1. Receive circular pattern and set screen mode to

“FULL”.

2. Set controls for brightness and contrast to maximum.

3. Connect high-voltage meter to the anode of CRT and

GND.

4. Confirm that voltage is 26 kV ±1.0kV at maximum

beam current 1.2mA ± 0.05

VERTICAL CENTRING ADJUSTMENT

1. Receive circular pattern and set screen mode to

“FULL”.

2. Enter the service mode and select item no.16.VERT

SHIFT.

.3 Press the LEVEL+ or LEVEL - button to adjust the

vertical centre.

VERTICAL HEIGHT ADJUSTMENT

1. Receive circular pattern and set screen mode to

“FULL”.

2. Enter the service mode and select item no. 17. VERT

AMPL.

3. Press the LEVEL+ or LEVEL - button to adjust the

vertical height.

1. Receive circular pattern and set screen mode to

“FULL”.

2. Enter the service mode and select item no. 314. TXT -

H - POS.

3. Press the LEVEL+ or LEVEL - button to adjust

proper OSD positioning.

OSD POSITIONING ADJUSTMENT

VERTICAL ADJUSTMENT

HIGH-VOLTAGE CONFIRMATION

HORIZONTAL ADJUSTMENT

314 TXT - H - POS 7