Sanyo CE28C7A Schematic

Part No. SKSM0681 C5WGL/S OCTOBER 2003

Colour Television Service Manual

Model CE28C7A-C

Service Ref. No. CE28C7A-C-00

CE28C7A-C-01

PRODUCT CODE: 111361006 ORIGINAL VERSION: Chassis No. EB7-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

CE28C7A-C

Contents

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

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

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

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

CPU Functions ..............................................................................................................................................................................10~1 1

Component Locations ............................................................................................................................12~13

IC Block Diagrams..................................................................................................................................14~18

Pin description of semiconductors................................................................................................................19

Part Description and reading of schematic diagram ....................................................................................20

Cabinet Parts List ........................................................................................................................................21

Electric Parts List....................................................................................................................................22~26

Please use Schematic Diagram SKP20415 with this Service Manual.

-3-

C5WGL/S

BLOCK DIAGRAM

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

Outline

AERIAL

IC3451

NICAM/

60 61

A101

TUNER

X132

STEREO

5 4

IF-IN

SIF-OUT

SCL

SDA

SCL

K1001

SCART SC1

SDA SCL

X131

SIF-IN

IC1201

Video-IN

R/G/B-IN

Video/Y-Out

9816

AV-VIDEO-SW <LA7954>

Video-Out

IC201

IF/VIDEO/CHROMA/DEF

SDA

11/7/15

C-IN

EW-OUT

SCART SC2

Y-IN

Video/

Y-IN

C-IN

V-OUT

K1002

C-OUT

H-OUT

M-OUT R

51/53

Q462

C-IN

R/G/B-IN

2/5/12

1/3/13

575655

121314

Q461

7/11/15

IC1401

RGB-SW

L461

L462

R/G/B-OUT

TUBE

PICTURE

Q701

Q721

Q711

T451 FLYBACK

CRT

HEATER

Q432

H-OUTPUT

Q431

H.V

FOCUS/SCREEN

200V

D.Y

A1901

1 5

8/10

MUTE

CPU

IC801

RC RECEIVER

RC-IN

KEY SW

IC001

AUDIO-OUT

BLK

181716

KEY-IN

SDA

C BUS

SCL

CONTROL

H-BLANK

SDA

IC803

MEMORY

SCL

D441

IC501

V-OUTPUT

Q682

Q685

Q686

27V

145V

Reg.

Q651

25V

Q641

Q642

Q645

Q643

-27V

D646

D641

IC642

WIDTH

SCREEN

CONTROL

POWER

D647

5V-1

IC643

Q661

D637

PROTECT

Q666

IC641

T611

Q611

D615

CONVERTER

C607

Q613

SP902

SP901

SPEAKER

D603-D606

SW901

C5WGL/S

-5-

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.

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 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” COMB FILTER OFF or ON For factory use, default “OFF” BBE ON or OFF BBE sound mode, default “OFF” AUTO VOLUME ON or OFF Default “OFF” HEADPHONE ON or OFF Headphone control , default “OFF” COUNTRY UK, IRE TV system, default “UK”

BG/DK / I / LL’ WIDE ON or OFF Wide mode, default ON AV3 ON or OFF Front AV3 mode, default OFF CS or A,B CS or A.B

OPTION MODE FOR CE28C7A-C-00/01

OPTION

ON-TIMER ON SORT MODE SORTING P&P ON WEL. TEXT ON COMB FIL TER OFF BBE OFF AUT O VOLUME OFF HEADPHONE OFF COUNTRY BG/DK/I/LL' WIDE OFF AV3 OFF CS / A,B CS

ADJUST : EXIT : RECALL

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C5WGL/S

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 programmed by using “OPTION SETTING” on previous page and the following adjustments.

ADJUSTABLE SERVICE ADJUSTMENT

REGULAR

IMAGE

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. Press

the P▼ button to highlight the mode required (Regular, Image, others and TB12**). Then press the F/OK button to select the mode.

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-C P Vertical Position Adjustment 2 P H-P P Horizontal Position Adjustment 3 P V-L P Vertical Linearity Adjustment 4 P VSC P Vertical S-Correction Adjustment 5 P V-A P Vertical Size Adjustment 6 P H-S P Horizontal Size Adjustment 7 P E-P P Pin Cushion Adjustment 8 P E-T P Trapezoid Distortion Adjustment 11 P ECT P Top Corner Correction Adjustment 12 P ECB P Bottom Corner Correction Adjustment 13 P HPA P Parallelogram Distortion Adjustment

Item No. OSD Description

1 AGC AGC Adjustment 2 -- Cut-Off Drive Adjustment 3 GRY G-Drive Adjustment (white balance) 4 GRY B-Drive Adjustment (white balance) 5 CTR Contrast Adjustment (use factory setting)(for factory use) 6 -- Screen Adjustment mode 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.

The available adjustment items are as follows;

Image : This can be adjusted for picture images/shapes. Regular : This can be adjusted for the service adjustment. other : This is for factory setting. DO NOT ADJUST. TB1251 : This is for the factory setting. DO NOT ADJUST.

+ 8 hidden pages