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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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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BLOCK DIAGRAM

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

Outline

FOCUS

SCREEN

AV1

AV2

FBT

T451

D.Y

Q701

Q711

Q721

VIDEO-OUT

Q242

CRT

Q243

VIF

X132

Q244

IC201

X131

TV-OUT

Q121~Q133

SIF

SC-1

SIF-IN

TV-IN

DEF

IF/VIDEO/

CHROMA/

C BUS

MONTO

SC-2

Y-OUT

C-OUT

SYNC-IN

394041

1516171826

BLK

-OUT

Refer also

EW-OUT

to FIG.-2.

AV SELECTOR

NICAM DECODER

H-OUT

Q432

T431

Q431

PCC

CONTROL

V-OUT IC501

Aerial

A101

TUNER

Q141

POWER

PC-IN

CPU

SDA

IC803

MEMORY

CVBS-IN

PROTECT-IN

1 - 15

80 - 63

ROM

IC802

BLK

IC801

SCL

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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

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

33 32

Y-OUT

C-OUT

Y-IN

C-IN

L-OUT

R-OUT

Q1204/1207

Q1205

Q1202

AUDIO-OUT

Q1203

IC3451 NICAM

37 36

STEREO

60 61

4 5

I2C BUS

CONTROL

IC803

MEMORY

RC-IN

SDA

POWER-FAIL

DETECT

SCL

POWER

25 26 28

1 - 7, 63 - 80

KEY-IN

IC801

CPU

MUTE

44 45

46 47

60 61

Q806

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

CVBS

IC802

ROM

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Deflection Control

IC501

V-Output<LA7846>

IC201

IF/VIDEO/

DEFLECTION

EW-Out

Deflection

Yoke

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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CABINET DISASSEMBLY

CABINET BACK DISASSEMBLY

1. Remove 7 screws(A).

2. Pull out the cabinet back.

(A)

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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

BG ONLY

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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

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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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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

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CORNER 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.10 “WIDE 10.P CNR”.

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

distortion of the vertical line around the cor ners.

HORIZONTAL CENTRING ADJUSTMENT