Sanyo CE28DFN3-B Manuel utilisateur

Part No. SKSM0794 C7VDS MARCH 2005

Colour Television

Service Manual

Model CE28DFN3-B

Service Ref. No. CE28DFN3-B-00

PRODUCT CODE: 111361003

ORIGINAL VERSION: Chassis No. EB8-D

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

CE28DFN3-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 SKP20528

with this Service Manual.

-2-

C7VDS

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) 12 x 2

Dimensions (WxHxD) 786 x 519 x 500mm

Weight 34.8 Kg

-3- C7VDS

BLOCK DIAGRAM

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

AV3 H/P

ON/OFF

FRONT UNIT A FRONT UNIT B

1AA0B10E689AA 1AA0B10E689AB

K16E K16F SPK - L

K19H SPK - R

K16FF K1103

K2 PL8004

KA KH

KF MAIN UNIT DIGITAL MODULE

1AA0B10H068PA K5 PL8003 1AV4U20B64200

240VAC

K4 PL8002A PL8006

K9 PL8002B

K4A KP PL8005

K4B

K4B (VERTICAL) RF IN K2 - 6V SUPPLY -PL8004

K7P K3 - AUDIO- PL8003

K4 - COMM - PL8002A

KQ K7Q K9 - VIDEO- PL8002B

KP K7P K5 - GND -PL8005

K16E - DEGAUSSING

K7Q

K4A (HORIZONTAL)

DIGITAL

TUNER

A101 CI SLOT

PWB SOCKET

1AA0B10H068PB

Outline

-4-

C7VDS

(A) (A)

CABINET DISASSEMBLY

CABINET BACK DISASSEMBLY

1. Remove 9 screws(A) for 28”

2. Pull out the cabinet back.

(A)

-5- C7VDS

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

PLUG & PLAY ON or OFF Plug & Play mode, default “ON”

WELCOME 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”

WIDE ON or OFF Wide mode, default “ON”

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

SORT MODE SORTING

PLUG & PLAY ON

WELCOMETEXT ON

AUTOVOLUME OFF

SURROUND ON

VIRT SUBWOOFER ON

WIDE ON

AV3 ON

OPTION

ADJUST : EXIT : RECALL

OPTION MODE FOR CE28DFN3-B-00

i

/

-6-

C7VDS

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

6 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- C7VDS

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 EB8D 3_52

i

-8-

C7VDS

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. Enter the service mode and select item no. 6.

COLLAPSED LINE

2. Turn screen VR until collapsed line is just visible then

stop turning. Press menu key on remote control to exit

the service mode.

DRIVE ADJUSTMENT

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

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

4. 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- C7VDS

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

-10-

C7VDS

CPU PORT FUNCTIONS

Pin No Function Name Function In/Out

1 VSS Gnd --

2 VSS Gnd

3 1v8_1 1.8v Supply --

4 3v3 3.3v Supply --

5 Vref 3.3v Reference --

6 Vref V Ref Gnd --

7 Vref 3.3v Reference --

8 Vref V Ref Gnd --

9 Vref 3.3v Reference --

10 XTAL IN Clock Oscillator In

11 XTAL OUT Clock Oscillator Out

12 Vss Gnd --

13 Vguard sw --

14 Dec Dig 1.8v source supply Out

15 5v 5v Supply --

16 Phi 2 Phi 2 --

17 Phi 1 Phi 1 --

18 Gnd Gnd --

19 Sec pii --

20 Dec BG --

21 EW Drive parabola out Out

22 VdrB Vertical drive B Out

23 VdrA Vertical drive A Out

24 Vif 1 Vision IF 1 In

25 Vif 2 Vision IF 2 In

26 Vsc --

27 I Ref Reference current --

28 Gnd Gnd --

29 Sif 1 Sound IF 1 In

30 Sif 2 Sound IF 2 In

31 Agc Auto matic gain control In

32 Eht Eht In

33 SSif/Ref Iin/Avl/Ref Out --

34 Audio in Scart L In

35 Audio in Scart R In

36 Audio Out Scart L Out

37 Audio Out Scart R Out

38 --

39 Qsso/Amo/AudioEm --

40 Gnd --

41 PLL IF Phase Lock Loop If --

42 SifAgc SifAgc --

43 IFVo Scart 1 Video Out

44 FmRo --

45 V8Audio Switches --

46 AgcsSif --

47 V5P2 5v Supply --

48 Svo/IfVo/Cbvs1 Scart 2 Video Out

49 Audio4 L In Scart 2 Audio L In

50 Audio4 R In Scart 2 Audio R In

51 Y4/Cvbs4 Av3 Video In

52 C4 --

53 Audio2InL Av3 Audio L In

54 Audio2InR Av3 Audio R In

55 Cvbs2/y Scart 1 Video In

56 Audio3InL --

57 Audio3InR --

58 Y3/Cvbs Scart 2 Video In

59 C3 Scart 2 Chroma In In

60 Audio Out L SL Audio out Left Speaker Out

61 Audio Out L SR Audio Out Right Speaker Out

62 Audio Out HPL Scart Audio L Out 2 / monitor Out Out

63 Audio Out HPR Scart Audio R Out 2 / monitor Out Out

64 Pip --

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