DAEWOO DSC-3270E Service Manual

REAL FLAT 100Hz WIDE TV

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DAEWOO

3270E

DAEWOO ELECTRONICS CO., LTD

D I I

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DIGITAL TV DEVISION

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2002. 4

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*SPECIFICATION

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D I G I T A L

1.Outstanding Picture Quality

-32” pure Flat Picture Tube

- 4H COMB Filter

- Color Transient Improvement

- 100 HZ Scanning

- Velocity Modulation Scanning

- Dynamic Double Focus System

2. High Quality Sound

- Dolby Pro-Logic

- 8W + 8W + 5W Speaker

3.Various picture control

- Available for 3 kinds of input

- OSD : various language support

- Still picture

- 4:3 , 16:9 , panorama , Zoom , Zoom+

- Tilt control Circuit

4. Reliability

- Safety Standard : CE , CB

- TSD , OCP

DAEWOO ELECTRONICS CO., LTD

DIGITAL TV DEVISION

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* POWER BLOCK * DEFLECTION BLOCK

- Stand-by power Part -Horizontal part

- Main power Part -Vertical part

- Audio power part -Dynamic double Focus part

*Video Block * Audio Block

-Tuner part - Audio signal processing part

-AV switching part - Amplify part

3270E

S Y N O P S I S

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-video processing part

-video amplify part

INPUT VOLTAGE : AC 230V, 50Hz

POWER CONSUMPTION : 180W (VOLUME MAX, STANDARD PICTURE)

DIGITAL TV DEVISION

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Block Diagram

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DIGITAL TV DEVISION

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COMPOSITION

DAEWOO

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OF POWER SUPPLY

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POWER SUPPLY is composed of Fly-back form to supply various power.

Pin No USAGE VOLTAGE CURRENT

8 STAND-BY 5V 5 ± 0.5 V 100mAT801

T802

T804

18

17

15

14

13

11 General Purpose 5 ± 0.5 V 500mA

8

FBT B+ 140V line

SVM AMP Transistor B+

H-DRIVE Trans B+

General Purpose

Audio Amp B+

140± 2 V

130 ± 0.5 V

24 ± 0.5 V

12 ± 0.5 V

9 ± 0.5 V

26 ± 2 V

850mA

200mA

500mA

400mA

1200mA

DAEWOO ELECTRONICS CO., LTD

DIGITAL TV DEVISION

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3270E

Stand By CIRCUIT

THE AC INPUT POWER IS RECTIFIED AND FLATED BY THE NOISE FILTER, BRIDGE DIODE AND CONDENSER (C806)

THE RECTIFIED AND FLATED VOLTAGE IS

SUPPIED TO TRANS AND SMPS IC (I801)

SECONDARY CIRCUIT OF THE TRANS (T801) SUPPLIES THE STAND-BY POWER FOR MICROPROCESSOR

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S/B 5V

NOISE

FILTER

DAEWOO ELECTRONICS CO., LTD

DIGITAL TV DEVISION

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Degaussing CIRCUIT

PIN3 AT MICOM SUPPIES D/G SW SIGNAL (L->H) TO BASE OF Q802

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D/G SW

Q802 ON -> CURRENT FLOWS THROUGH RELAY COIL -> SW ON

AC INPUT CURRENT FLOWS AT D/G COIL THROUGH RV801

R838’S RESISTANCE INCREASES BY THE CURRENT THEN THE RELAY IS OFF

DAEWOO ELECTRONICS CO., LTD

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MAIN POWER CIRCUIT

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D/G Relay

PWR Relay

28V

D/G SW

PWR SW

PIN53 AT MICOM SUPPIES POWER SIGNAL (L->H) TO BASE OF Q803

AFTER Q803 ON, CURRENT FLOWS THROUGH RELAY COIL. THEN, THE SWITCH ON

DAEWOO ELECTRONICS CO., LTD

WHEN VOLTAGE AT THE PIN 9 OF STR-S6709 IS APPROXIMATELY 8V I803 (STR-S6709) IS STARTED.

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OPERATION OF STR--

OPERATION OF STR

R807 START RESISTOR

Q801

DARLINGTON TR

D804

S6709

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CHARGED VOLTAGE AT C818 THROUGH START RESISTOR IS APPROXIMATELY 8V THEN, STR-S6709 START

AFTER START, THE STABLE VOLTAGE IS SUPPLIED TO #9 THROUGH THE D WINDING OF T802

T802

DURING d1 VOLTAGE IS RISING TO 8V. RECTIFIED d2 VOLTAGE IS USED

Vin

DAEWOO

D I G I T A L

STARTING POINT

RECTIFIED

d2 VOLTAGE

I803

STR-S6709

DAEWOO ELECTRONICS CO., LTD

C818

D806

D805

7.5V ZENER DIODE

DIGITAL TV DEVISION

d1 VOLTAGE

9