Daewoo DTU-14 D3VG Manual de usuario

S/M No. : CP371P-010

14/20/21 D4

14/16/20/21 D3

Service Manual

Colour Television

CHASSIS : CP-371

JAN. 2000

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr

Model :

DTU-14/16/20/21 D3VG

DTU-14/20/21 D4VG

DTU-14/20/21 D3TM

DTU-14/20/21 D4TM

Specifications

This service manual is a additional edition for CP-371 service guide.

Mains Voltage

PAL/SECAM-B/G, D/K, I, H, NTSC-3.58/4.43, NTSC-5.5

14" : 73W 20" : 78W

16" : 75W 21" : 86W

- . 2 Speaker (at any MOD. 10% THD )

: 5W + 5W (TWITTER 2.5W + 2.5W)

100 channels

VHF - L : CH2 - CH4

VG : R-28B04, TM : R-28B03

100 ~ 250V AC, 50/60Hz

Sound output

Speaker

Memory channel

Reception

Remote control

Function

with Game

without Text

with Text

without Game

TV Standard

Power Voltage

- . 2 Speaker : 7.5W 4 ohm

-. CHILD Lock (CH Lock)

VHF - H : CH5 - CH12

Cable Band : CHS1' - CHS3', CHS1 - CHS20

Hyper Band : CHS21 - CHS40

UHF : CH21 - CH69

-. 16 : 9 MODE

-. ZOOM MODE

-. Blue Back (ON/OFF)

-. Local Key Menu Control

-. Arrow puzzle Game

-. Monitor out

-. Simple SCART

-. Twitter Speaker

-. CHILD Lock (Security code Lock)

-. OSD MESH

-. 16 : 9 MODE

-. Blue Back (ON/OFF)

-. Local Key Control Menu Control

-. Monitor out

-. Simple SCART

-. Twitter Speaker

-. TELETEXT : 8 PAGE TELETEXT

TOP/FLOF MODE

-. ZOOM MODE

channel Unit

✔ Caution:In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the

latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)

TABLE OF CONTENTS

1. Specification ................................................................................................................................ 2

2. Safety Instruction ........................................................................................................................ 3

3. Circuit block Diagram ................................................................................................................. 4

4. IC Description .............................................................................................................................. 5

5. Trouble Shooting Charts ............................................................................................................ 15

6. Service Parts List ........................................................................................................................ 22

7. Mechanical Exploded View ......................................................................................................... 37

1. Specifications

VG : WITHOUT TXT. MODEL, TM : WITH TXT. MODEL

TV Standard PAL/SECAM-BG, D/K, I, H, NTSC-3.58/4.43, NTSC-5.5

Mains Voltage 100 ~ 250V AC, 50/60Hz

Power Consumption 14" : 73W 20" : 78W

16" : 75W 21" : 86W

Sound output -. 2 Speaker ( at any MOD. 10% THD ) 5W + 5W ( TWITTER 2.5W + 2.5W )

Speaker -. 2 Speaker : 7.5W 4 ohm ( 2EA )

Antenna Impedance 75 ohm unbalanced

300 ohm balanced with supplied balun

Tuning system Voltage Synthesize Tuning System

Memory channel 100 channels

Reception

channel Unit VHF - L : CH2 - CH4

VHF - H : CH5 - CH12

Cable Band : CHS1’ - CHS1 - CHS20

Hyper Band : CHS21 - CHS40

UHF : CH21 - CH69

Remote control VG : R-28B04, TM : R-28B03

Screen size 14" : 34 Cm ( A34JLL 90 x 02 )

16" : 38 Cm ( A38JLL 90 x 02 )

20" : 48 Cm ( A48JLL 90 x 02 )

21" : 51 Cm ( A51JLL 90 x 02 )

Weight 14" : 9.7 Kg ( set )

16" : 12 Kg ( set )

20" : 17.2 Kg ( set )

21" : 21.5 Kg ( set )

Aux. Terminal Front : Earphone, Video In, Audio In

Rear : Video In, Audio In, Monitor out ( 2 RCA JACK, 1 SCART JACK )

Function VG TM

-. CHILD LOCK ( CH LOCK )

-. 16 : 9 MODE

-. ZOOM MODE

-. Blue Back ( ON/OFF )

-. Local Key Menu Control

-. Arrow puzzle game

-. Monitor out

-. Simple SCART

-. Twitter speaker

-. CHILD LOCK ( SECURITY CODE

LOCK )

-. OSD MESH

-. 16 : 9 MODE

-. ZOOM MODE

-. Blue Back ( ON/OFF )

-. Local Key Control Menu Control

-. Monitor out

-. Simple SCART

-. Twitter speaker

-. TELETEXT : 8 PAGE TELETEXT

TOP/FLOF MODE

2. Safety Instruction

WARNING

: Before servicing this chassis, read the “ X-RAY RADIATION precaution “, “ safety precaution “ and “

product safety notice “below.

1. Excessive high voltage can prodece potentially haz-

ardous X-RAY RADIATION. To avoid such hazards,

the high voltage must not exceed the specified limit.

Thenominalvalueofthehigh voltageofthisreceiver is

23-24kv(14”), 26-27kv(20”, 21”) at max beam current.

The high voltage must not, under any circumstances,

exceed 27.5kv (14”, 20”), 29.0kv(21”).

Each time a receiver require servicing, the high

voltage should be checked. It is recommended the

reading of high voltage recorded as a part of the ser-

vice records. it is important to use an accurate and reli-

able high voltage meter.

2.Theonly source of X-RAYRadiationinthisTVreceiver

is the picture tube. For continuous RADIATION protec-

tion, the replacement tube as specified in the part list.

X-RAY RADIATION PRECAUTION

1. Potentials of high voltage are present when this

receiverisoperating. Operation of the receiveroutside

the cabinet or with the back cover removed involves a

shock hazard from the receiver.

1)Servicing should notbe attempted by anyone who is

not thoroughly familiar with the precautions neces-

sary when working on high-voltage equipment.

2) Always discharge thepicturetubetoavoidthe shock

hazard before removing the anode cap.

3) Dischange the high potential of the picture tube

before handling the tube. The picture tube is highly

evacuated and if broken, glass fragments will be

violently expelled.

2. If any Fuse in this TV receiver is blown, replace it with

the FUSE specified in the Replacement Parts List.

3. When replacing a high wattage resistor ( oxide meta

film resistor ) in circuit board, keep the resistor 10mm

away from circuit board.

4. Keep wires away from high voltage or high tempera-

ture components.

5. This receiver must operate under AC260 volts, 50Hz /

60Hz. ( AC 100 ~ 250 volts, 50 / 60 Hz ) NEVER con-

nect to DC supply or any other power or frequency.

SAFETY PRECAUTION

Many electrical and mechanical parts in this chassis

have special safety-related characteristics.

These characteristics are often passed unnoticed by

a visual inspection and the X-RAY RADIATION pro-

tection afforded by them cannot necessarily be

obtained by using replacement components reted for

higher voltage, wattage, etc.

PRODUCT SAFETY NOTICE

3. Circuit Block Diagram

4. IC description

4-1. DW 5457 - *** ( SDA 5457 : SIEMENS TYPE )

(1) General Description

The SDA 545x is a single chip teletext decoder for decoding Worled System Telertext data as well as Video Program-

ming System ( VPS ), Program Delivery Control ( PDC ), and Wide Screen Signalling ( WSS ) data used for PALplus

transmissions ( line 23 ). Furthermore, the device provides an integrated C500 based general-purpose, fully 8051-

compatiblemicrocontroller with televisionspecific hardware features.The on-chip display unit for displaying ‘ Level 1.5

’teletext data can be used for customer defined on-screen displays. Up to 10 display pages are available internally.

ROMless versions can be used together with external RAM.

The SDA 545x contains a slicer for VPS, WSS, PDC, and TTX, an accelerating acquisition hardware modul, a display

generator for “Level 1.5 “ TTX data, and an 8 bit microcontroller running at 250 ns cycle time ( min. ). The controller

with dedicated hardware guarantees flexibility, does most of the internal processing of TTX acquisition, transfers data

to/fromtheexternal memory interface and receives/transmits dataviaIC-firmware user-interface. The slicer combined

with dedicated hardware stores TTX data in a VBI buffer of 746 Byte. The microcontroller firmware performs all the

acquisition tasks ( hamming - and parity - checks, page search and evaluation of header control bits ) once per field.

Additionally, the firmware can provide high-end Teletext-features like Packed-26-handling, FLOF, TOP ( in 8/10-page-

versions ) and listpages. The interface to the user software is optimized for minimal overhead ( see firmware data

sheet for details ).

The SDA 545xOTP contains 64KB-Program-ROM plus 6KB-Character-ROM, which both are ‘one-time-programmable

‘( OTP ). It is pin-compatible to all the other ROM-types of SDA 545x. It can as such be used as a test circuit, a ramp-

up solution or even for small series in mass production.

(2) Features

Acquisition ( only SDA 545x )

Feature selection via special function register

Simultaneous reception of TTX, VPS, PDC, and WSS ( line 23 )

Fixed framing code for VPS and TTX

Acquisition during VBI

Direct access to VBI RAM buffer

Acquisition of packets x/0 to x/24, x/26, x/27, 8/30 ( firmware )

Assistance of all relevant checks ( firmware )

1-bit framing code error tolerance ( switchable )

Complete TTX-acquisition firmware with simple user interface

Display

Feature selectable via special function register

50/60/100/120-Hz display

Level 1.5 serial attribute display pages

Blanking and contrast reduction output

10 direct addressable display pages for SDA 5450

8 direct addressable display pages for SDA 5454 to SDA 5457

1 direct addressable display pages for SDA 5451 to SDA 5452

12 X 10-character matrix

96 character ROM (standard G0 character set )

156 national option chara ters for 12 languages ( European version )

288 characters for X/26 display

64 block mosaic graphic characters

32 characters for OSD in expanded character ROM + 32 characters inside OSD box

saturation of basic colors adjustable in 4 steps

8 foreground + 8 background colours out of 64 colours

Conceal/reveal

Transparent foreground/background - inside/outside of a box

Constast reduction inside/outside of a box

Cursor ( Colour changes from foreground to background colour )

Flash ( flash rate 1 s, independent of frame rate )

Programmable horizontal and vertical sync delay

Full screen background colour in outer screen

Double size/double width/double height characters

Character shadowing

Box shadowing

Up to 64 Characters in a display row

Software selectable pixel frequency ( 12, 13.7, 16, 19.2 and 24MHz )

Synchronization

Display synchronization to Sandcastle Pulse or Horizontal Sync ( HS ) and Vertical Sync ( VS )

Microcontroller

8bit C500-CPU ( 8051 compatible )

24-MHz internal clock ( max. )

0.25 us(min.) instruction cycle

Non-multiplexed 8-bit data and 16 ... 19-bit address bus ( ROMless Version )

Eight 16-bit data pionter registers ( DPTR )

Two 16-bit timers

Watchdog timer

Capture compare timer for infrared remote control decoding

256-bytes on-chip RAM

Display RAM and TXT/VPS/PDC/WSS-Acquisition-Buffer directly accessible via MOVX

10Kbyte on-chip diaplay-RAM ( access via MOVX ) for SDA 5450

8Kbyte on-chip display-RAM ( access via MOVX ) SDA 5454 to SDA 5457

1Kbyte on-chip display-RAM ( access via MOVX ) for SDA 5451 to SDA 5452

1Kbyte on-chip ACQ-buffer-RAM ( access via MOVX )

1Kbyte on-chip extended-RAM ( XRAM, access via MOVX ) for SDA 5450 and SDA 5454 to SDA 5457

6 Channel 8-bit pulse width modulation unit

2 Channel 15-bit pulse width modulation unit

ADC with 8-bit resolution ( 4 multiplexed input channels )

Ports

One 8-bit I/O-port with open drain output and optional I C Bus emulation ( Port0 )

Two 8-bit multifunctional I/O-ports ( Port1, Port3 )

IC description

One 4-bit port working as digital or analog inputs for the ADC ( Port2 )

One 1-bit Input-port with secondary functions ( P4.7 / VS / EVEN_ODD )

One 1-bit I/O-port ( P4.0 ) ( ROM Version )

One 2-bit I/O-port with optional RAM/ROM address expansion up to 512Kbyte ( P4.0 and P4.1 ) ( ROMless Version )

One 2-bit I/O-ports ( P4.2, P4.3 )

Additional Features

Single external 6MHz crystal, all necessary clocks are generated internally

CPU clock speed selectable via special function registers ( 7 possible selections between 3 and 24 MHz )

IC description

(3) Block Diagram

Figure 5 Block

Diagram

1) only ROM-versions

2) only ROMless-versions

3) only SDA5450 and SDA5454 to SDA5457

4) 10kByte for SDA5450, 8kByte for SDA5454 to SDA5457, 1kByte for SDA5451 and SDA5452

IC description

(4) Pin Configuration S-DIP-52 ( ROM Version )

( Top view )

Figure 1 S-DIP-52 ( ROM Version of SDA 545x )

IC description

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