Sanyo CE28DFN3-B-00 Schematic

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 ..............................................................................................................................................................................10~1 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 ........................................................................................................................................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 AVterminal

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

Outline

CI SLOT

1AV4U20B64200

DIGITAL

SPK - L

PL8004

PL8003

PL8002A PL8006

PL8002B

PL8005

TUNER

K2 - 6V SUPPLY - PL8004

K4 - COMM - PL8002A

K16F

1AA0B10E689AA 1AA0B10E689AB

1AA0B10H068PA K5

MAIN UNIT DIGITAL MODULE

A101

K4A KP

K4B

K16E - DEGAUSSING

K4B (VERTICAL) RF IN

PWB SOCKET

1AA0B10H068PB

K4A (HORIZONTAL)

K16E

FRONT UNIT A FRONT UNIT B

ON/OFF

K19H SPK - R

K16FF K1103

240VAC

K7P K3 - AUDIO - PL8003

KQ K7Q K9 - VIDEO - PL8002B

KP K7P K5 - GND - PL8005

K7Q

-4-

C7VDS

(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”

OPTION MODE FOR CE28DFN3-B-00

i

OPTION

SORT MODE SORTING PLUG & PLAY ON WELCOME TEXT ON AUT O VOLUME OFF SURROUND ON VIRT SUB WOOFER ON WIDE ON AV3 ON

ADJUST : EXIT : RECALL

-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

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

Service Item Number. Symbol 1 Symbol 2

13 14 A02

15 A03 16 A04 17 A05 18 A06 19 A07 20 A08 21 A09 22 A10 23 A11 24 A12 25 A13 26 A14 27 A15 28 A16 29 A17 30 A18 H BLK SW 31 A19 H BLK L 32 A20 H BLK R 33 A21 OSVE 34 A22 EVB 35 B02 36 B09 37 B10 38 B11 39 B12 40 B13 41 B14 42 B15 43 B16 44 B17

A01

Track. mode 50Hz Full

Vert. Zoom 50Hz Full Vert. Slope 50Hz Full

Vert. Shift 50Hz Full

Vert. Ampl. 50Hz Full

S-Corr. 50Hz Full

V.Lin.Ctrl. 50Hz Full

V.Linearity 50Hz Full

EW Width 50Hz Full Hor. Shift 50Hz Full

EW Parabola 50Hz Full

Trapezium 50Hz Full

UC Parabola 50Hz Full

LC Parabola 50Hz Full

Hor. Bow 50Hz Full

Parallel 50Hz Full

Vert. Scroll 50Hz Full

Vert. Zoom 50Hz Natural / or 4:3 squeeze mode

EW Width 50Hz Natural / or 4:3 squeeze mode Hor. Shift 50Hz Natural / or 4:3 squeeze mode

EW Parabola 50Hz Natural / or 4:3 squeeze mode

Trapezium 50Hz Natural / or 4:3 squeeze mode

UC Parabola 50Hz Natural / or 4:3 squeeze mode

LC Parabola 50Hz Natural / or 4:3 squeeze mode

Hor. Bow 50Hz Natural / or 4:3 squeeze mode

Parallel 50Hz Natural / or 4:3 squeeze mode

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

Frequency Wide Mode

50Hz Full 50Hz Full 50Hz Full 50Hz Full 50Hz Full

Explanation

Track. Mode(HCO)

Vertical zoom

Vertical slope

Vertical shift

Vertical amplitude

S-correction

V.Lin.Ctrl.

V.Linearity

EW width

Horizontal shift

EW parabola/width

EW trapezium EW upper corner parabola EW lower corner parabola

Horizontal bow

Horizontal parallelogram

Vertical Scroll

RGB blanking mode Timing of wide blanking front(WBF) Timing of wide blanking rear(WBR)

Black current measuring lines in overscan

Extended vertical blanking

Vertical zoom

EW width

Horizontal shift

EW parabola/width

EW trapezium EW upper corner parabola EW lower corner parabola

Horizontal bow

Horizontal parallelogram

Vertical Scroll

-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 clearest 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