Sanyo CE28B5-C Manuel utilisateur

Part No. SKSM0484 C3SEV JULY 2001

Colour Television

Service Manual

Model CE28B5-C

Service Ref. No. CE28B5-C-00

PRODUCT CODE: 111354504

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

CE28B5-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

-2-

C3SEV

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 B/G

Colour system PAL/NTSC4.43 (PAL/NTSC4.43/MTSC3.58 IN AV MODE)

Receiving channel UHF: #21~69

VHF: E2-E12

Aerial input impedance 75ohm

AV terminal

21 Pin SCART Terminal AV1:CENELEC standard with RGB

AV2:CENELEC standard with S-inputs

Front AV AV3:RCA Terminal, Video and Audio (L/R)

Sound output(Music) 12W x 2

Dimensions (WxHxD) 736 x 597 x 494mm

Weight 32 Kg

-3- C3SEV

BLOCK DIAGRAM

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

IC801

CPU

IC803

MEMORY

SCL

SDA

IC802

ROM

IC201

IF/VIDEO/

CHROMA/

DEF

Q242

Q243

Q244

Q701

Q711

Q721

VIDEO-OUT

CRT

Q121~Q133

TV-OUT

SIF-IN

C-OUT

Y-OUT

AV1

AV2

TV-IN SC-1

SC-2

MONTO

-OUT

X132

X131

VIF

SIF

T451

FBT

D.Y

PCC

CONTROL

Q432

Q431

H-OUT

EW-OUT

V-OUT IC501

SYNC-IN

BLK

I2C BUS

BLK

CVBS-IN

25 26

19 1 - 15

80 - 63

T431

PROTECT-IN

PC-IN POWER

Q141

A101

TUNER

Aerial

FOCUS

SCREEN

Refer also

to FIG.-2.

AV SELECTOR

NICAM DECODER

Outline

-4-

C3SEV

IC1201

AV-SELECTOR

1(V)

2(L)

4(R)

13(V)

14(L)

16(R)

7(V)

8(L)

9(Y)

10(R)

11(C)

41(V)

(V)34

MONITOR-OUT

Q1202

Q1203

Y-IN

C-IN

FRONT AV3

MONITOR-OUT

SC-1

(VIDEO/AUDIO-L/R)

SC-2

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

SC-1

SC-2

K12J

FRONT-AV

K12H

L-OUT

R-OUT

IC3451

NICAM

STEREO

C-OUT

Y-OUT

SIF-IN

AUDIO L/R-OUT AUDIO-OUT

IC201

IF/VIDEO/

CHROMA

IC001

AUDIO-OUT

SDA/SCL

(VIDEO)

Y-OUT

C-OUT Q1205

Q1204/1207

I2C BUS

AV Selector

NICAM DECODER

IC801

CPU

25 26 28 40

1 - 7, 63 - 80

POWER

KEY-IN

RC-IN

MUTE

BLK-OUT

B-OUT

G-OUT

R-OUT

Q806 CVBS

POWER-FAIL

DETECT

SCL

SDA

IC803

MEMORY

I2C BUS

CONTROL

IC802

ROM

System Control

Fig.-2

Fig.-3

-5- C3SEV

IC201

IF/VIDEO/

DEFLECTION

V-Drive

H-Drive

Q431

IC501

V-Output<LA7846>

Q462

Deflection

Yoke

Horiz.

Coil

Vert.

Coil

T451

FlyBack Trans

CS SW

Screen Width Control

Pcc Control

Q461

D441

T431

Q431

H-Output

Drive Trans

L461/L462

EW-Out

Deflection Control

-6-

C3VES

CABINET DISASSEMBLY

CABINET BACK DISASSEMBLY

1. Remove 10 screws(A).

2. Pull out the cabinet back.

(A)

(A) (A)

(A)

(A) (A)

(A)

-7- C3SEV

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 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

ON-TIMER ON

SORT MODE AUTOTUNE/SORT

PLUG & PLAY ON

WELCOMETEXT ON

CODETEST OFF

WSS ON

WIDE OFF

OPTION UK

312/313 Mode OFF

AV3 OPTION ON

3D SURROUND ON

OPTION

ADJUST : EXIT : RECALL

-8-

C3SEV

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.

REGULAR

WIDE

OTHERS

TB1251

ADJUST

SELECT:

EXIT : RECALL

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 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

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.

-9- C3SEV

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 necessary to set the option settings and readjust the service adjustments listed on

left page.

REGULAR

1, AGC 38

Adjustment No.

and Item name Adjustment Data

WIDE

1. PV-P 1F

Adjustment No.

and Item name Adjustment Data

REGULAR mode WIDE mode

-10-

C3SEV

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 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

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