DAEWOO DTE-21U6TH, PF51T30 Service Manual

Service Manual

51

Cm STEREO Color Television

MODEL

CHASSIS

DTE-21U6TH

PF51T30

CP-785AF

CP-785AF

S/M No. : TCP785AFF0

http : //svc.dwe.co.kr Apr. 2002

DAEWOO ELECTRONICS CO., LTD.

✔

Caution

: In this 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).

Service manual CP-785AF

Contents

1 - Main features ................................................................................................................................. 2

1-1 Specifications .................................................................................................................... 2

1-2 Channel table .................................................................................................................... 4

2 - Safety instruction.......................................................................................................................... 7

3 - Alignment instructions ................................................................................................................. 8

3-1 Microcontroller configuration : Service mode .................................................................... 8

3-2 Microcontroller configuration : Option................................................................................ 8

3-3 TV set Alignment............................................................................................................... 9

4 - IC description ................................................................................................................................ 10

4-1 TDA936x TV signal processor - TXT with embedded m-Controller. ..................................10

4-2 MSP3415D Multistandard Sound Processor..................................................................... 18

4-3 TDA894xJ Stereo Audio Amplifier..................................................................................... 22

4-4 TDA835xJ Vertical Amplifier.............................................................................................. 23

4-4-1 TDA8358J............................................................................................................... 24

4-5 TDA6107Q ........................................................................................................................ 25

4-6 24C08 8 Kbit EEPROM ..................................................................................................... 26

4-7 STR-F665X ....................................................................................................................... 27

5 - Circuit description......................................................................................................................... 29

5-1 Block diagram.................................................................................................................... 29

5-2 IF ....................................................................................................................................... 33

5-3 Source switching ............................................................................................................... 34

5-4 u-Controller I/O pin configuration and function.................................................................. 34

5-5 Sound processing.............................................................................................................. 35

5-6 Sound amplification........................................................................................................... 37

5-7 Vertical deflection .............................................................................................................. 37

5-8 Power supply (STR-F6654)............................................................................................... 39

5-9 TV start-up, TV normal run and stand by mode operations ..............................................43

6 -Service parts list............................................................................................................................. 50

PF15T30 .............................. ................................................................................................. 50

(DTE-21U6TH)

7 - Exploded view ............................................................................................................................... 59

8 - PCB Layout....................................................................................................................................

9 - Circuit Diagram..............................................................................................................................

60

61

Service manual CP-785AF

- 2 -

1-1 Specifications

TV standard

PAL, SECAM - B/G, H

Sound system

NICAM B/G
FM 2Carrier B/G

Power consumption

21" : 95W approx.

Sound Output Power

21" : 3W x 3W (at 60% mod, 10%THD)

Speaker

21" : 5W 8 ohm x 2

Teletext system

10 pages memory FASTEXT (FLOF or TOP)

Aerial input

75 ohm unbalanced

Channel coverage

Off-air channels, S-cable channels and hyperband

Tuning system

frequency synthesiser tuning system

Visual screen size

21" : 51 cm

Channel indication

On Screen Display

Program Selection

100 programmes

Aux. terminal

21" : INPUT1(RCA) : Audio / Video

INPUT2(RCA) : Audio / Video In

OUTPUT(RCA) : TV OUT
Headphone jack (3.5 mm) on front of cabinet

Remote Control Unit

R-44N08(RD-D90)

Front RCA Jack - Input 2

Pin Signal Description Matching value
1 Video Input 1.0 Vpp+/- 3dB , Impedance 75 ohm
2 Audio Input Left

0.5 Vrms, Impedance > 10k ohm

3 Audio Input Right 0.5 Vrms, Impedence > 10k ohm

Service manual CP-785AF

- 3 -

Rear RCA Jack - output

Pin Signal Description Matching value
1 TV Video 1.0Vpp +/- 3dB , Impedence 75 ohm
2
3 TV Audio Right 0.5Vrms at RF sound FM 54% Mod.(27kHz dev.)

TV Audio Left 0.5Vrms at RF sound FM 54% Mod.(27kHz dev.)

Rear SCART [or RCA Jack - Input1 and S-VHS (optional)]

- SCART : 21 pin Euro SCART -> Input1 & S-VHS

- RCA Jack : Input1 (S-VHS not available)

Pin Signal Description Matching value
1 N.C.
2 Audio Input Right

0.5 Vrms, Impedance > 10 kΩ
3 N.C.
4 Audio Earth
5 Earth
6 Audio Input Left

0.5 Vrms, Impedance > 10 kΩ
7 N.C.
8 N.C.
9 N.C.
10 N.C.
11 N.C.
12 N.C.
13 N.C
14 Earth
15 Chroma Input

+/- 3dB for a luminance signal of 1 Vpp
16 N.C.
17 Earth
18 Video In Earth
19 N.C.
20 Video Input / Y Input

1 Vpp +/- 3dB, Impedance 75 ohm
21 Common Earth

Service manual CP-785AF

- 4 -

1-2 Channel table

FREQUENCY TABLE CP-785AF

CH AUSTRALIA N/Z'land

C00

46.25

C01

57.25

C02

64.25

C03

86.25

C04

95.25

C05

102.25

C5A

138.25

C06

175.25

C07

182.25

C08

189.25

C09

196.25

C10

209.25

C11

216.75

N01

- 45.25

N02

- 55.25

N03

- 62.25

N08

- 203.25

N09

- 210.25

N10

- 217.25

-

- - - -

C21

471.25

C22

479.25

C23

487.25

C24

495.25

C25

503.25

C26

511.25

C27

519.25

C28

527.25

C29

534.25

C30

541.25

C31

548.25

C32

555.25

C33

562.25

C34

569.25

C35

576.25

C36

583.25

C37

590.25

C38

597.25

C39

603.25

C40

610.25

C41

617.25

Service manual CP-785AF

- 5 -

CH AUSTRALIA N/Z'land

C42

624.25

C43

631.25

C44

638.25

C45

645.25

C46

652.25

C47

659.25

C48

666.25

C49

673.25

C50

680.25

C51

687.25

C52

694.25

C53

701.25

C54

708.25

C55

715.25

C56

722.25

C57

729.25

C58

736.25

C59

743.25

C60

750.25

C61

757.25

C62

764.25

C63

771.25

C64

779.25

C65

786.25

C66

793.25

C67

800.25

C68

807.25

C69

814.25

C70 -
C71 -
C72 -
C73 ­C74 ­C75 -
C76 -
C77 -

S01

105.25

S02

112.25

S03

119.25

S04

126.25

S05

133.25

S06

140.25

S07

147.25

S08

154.25

S09

161.25

Service manual CP-785AF

- 6 -

CH AUSTRALIA N/Z'land
S10

168.25

S11

231.25

S12

238.25

S13

245.25

S14

252.25

S15

259.25

S16

266.25

S17

273.25

S18

280.25

S19

287.25

S20

294.25

S21

303.25

S22

311.25

S23

319.25

S24

327.25

S25

335.25

S26

343.25

S27

351.25

S28

359.25

S29

367.25

S30

375.25

S31

383.25

S32

391.25

S33

399.25

S34

407.25

S35

415.25

S36

423.25

S37

431.25

S38

439.25

S39

447.25

S40

455.25

S41

463.25

Service manual CP-785AF

- 7 -

2 - Safety instruction

WARNING: Only competent service personnel may carry out work involving the testing or repair of

this equipment.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid
such hazards, the high voltage must not exceed the specified limit. The nominal value of the high
voltage of this receiver is 26~28 KV (25” - 29”) at max beam current. The high voltage must not
under any circumstances, exceed 29.5 KV (25") or 31 KV (29").
Each time a receiver requires servicing, the high voltage should be checked. It is important to
use an accurate and reliable high voltage meter.

2. The only source of X-ray Radiation in this TV receiver is the picture tube. For continued X-ray

RADIATION protection, the replacement tube must be exactly the same type tube as specified
in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. Operation of the receiver

outside the cabinet or with the back board removed involves a shock hazard from the receiver.

1) Servicing should not be attempted by anyone who is not thoroughly familiar with the
precautions necessary when working on high voltage equipment.

2) Discharge 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 metal film resistor) in circuit board, keep the resistor
10 mm away from circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC 240 volts, 5O Hz. NEVER connect to DC supply or any
other power or frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this equipment have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the X-ray Radiation
protection afforded by them cannot necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are
identified in this manual and its supplements, electrical components having such features are identified
by designated symbol on the parts list. Before replacing any of these components, read the parts list in
this manual carefully. The use of substitutes replacement parts which do not have the same safety
characteristics as specified in the parts list may create X-ray Radiation.

Service manual CP-785AF

- 8 -

3 - Alignment instructions

3-1 Microcontroller configuration : Service mode
To switch the TV set into service mode please see instruction below.

1 - Select pr. number 91
2 - Adjust sharpness to minimum value and exit all menu.
3 - Quickly press the key sequence : RED - GREEN - menu

To exit SERVICE menu press menu key or Operate(Std By) key.

In Service Mode press “OK” to stop the microcontroller i.e. the I2C bus is free and the set can be
controlled by external equipment. Press “OK” again to allow the microcontroller to control the set
again

3-2 Microcontroller configuration : Option

Section

For

Adjustments

(Variable)

Items

AGC

R/G BIAS

R/G/B DRIVE

H-PARALLEL

H-BOW

H-SHIFT

V-SLOPE

V-Amplitude

V. S-Correction

V SHIFT
H-WIDTH

EW Parabola

Up-Conner
Dn-Conner

EW Trapezium

Bare

DATA

32

31/31

32/32/32

31
42
25
32
39
13
32
32
32
32
32
32

29"

38

31/31

32/32/28

36
34
30
35
19
27
34
37
20
32
32
29

25"

38

31/31

32/32/32

32
35
30
35
30
25
34
57
17
42
42
31

21"

38

31/31

32/32/32

32
35
30
38
35
25
45
35
00
32
32
29

OptionFor

Function

Change

(OTION)

For screen

Adjustment

04 04 04 04

HOTEL LOCK OFF OFF OFF OFF

HOTEL Max Vol 15 43 43 43

Clock Pr. 01 07 07 07

SVHS ON ON ON OFF

SCREEN 24 31 33 35

ON :

- impossible to change the

- Max. volume is limited.
It is available when HOTEL LOCK is on
Change the reference chanel for
Automatic clock setting
ON : disable S-VHS input
Because each CRT has
different screen Adjusting points

presetted channel

REMARK

old micom : 8/8

Option

0
1
2
3
4
5
6
7

Tuner

Daewoo & Samsung
Daewoo & Samsung

-

­Daewoo & Samsung
Daewoo & Samsung

-

-

Remote

Controller

For
Daewoo
Remote

controller

For

NEC

Remote

controller

Service manual CP-785AF

- 9 -

3-3 TV set Alignment
3-3-1. Service Remote controller for Alignment : R-30SVC7 (S/N:48B380SV7)

3-3-2. G2 alignement

- There are 2 kinds of screen voltage adjustment

- Method 1 (Use the SVC Remote Controller)
; TV in RF mode without any signal (noise signal)
; Press "SVC" button of Service Remote Controller
; Press "NORMAL" button of SVC Remote controller to change normal-1 mode
; Preset with WP Red/Green/Blue equal to 28-34, Black Red/Green/Blue equal to 28~34
; Press "SCREEN" button of Service Remote controller => Then you can hear the "BEEP" sound
; Adjust screen volume(FBT) when the "BEEP" sound disappeared

- Method 2 (Use the User Remote Controller)

; TV in AV mode without video signal => Black screen.
; TV preset with WP Red, WP Green and WP Blue equal to 32.
; TV preset with Black R, Black G equal to 8.
; Set TV in NORMAL I mode
; Adjust screen volume ( on FBT ) such that the highest cathod cut-off voltage measured on CRT
board, is Vcut off ± 5V.

Screen size Vcut-off

21”
25” 140V
29” 140V

125V~130V

3-3-3. White balance

- Select a dark picture and adjust Black G and Black R to the desired colour temperature.

- Select a bright picture and adjust WP Red, WP Green, WP Blue to the desired colour temperature.

3-3-4. Focus

- Adjust the Focus volume ( on FBT ) to have the best resolution on screen.

3-3-5. Vertical geometry

- Adjust the Vertical Amplitude, Shift, S-

Correction and Slope to compensate for vertical

distortion.

3-3-6. Horizontal picture centering

- Adjust H Shift to have the picture in the center of the screen.

Service manual CP-785AF

- 10 -

3-3-7. East / West correction

- Adjust the H Parall, H Bow, H Width, EW Parabo, Up Corner, Dw Corner, EW trapez to compensate
for geometrical distortion.

H. Parall

H. Bow

H.Width

EW.Parabola

Up Corner

Dw Corner

EW Trapez

3-3-8. AGC

- Adjust the antenna signal level at 68 dBmV± 2 (UHF - CH25)

- Set RF AGC to 0.

- Increase RF AGC level and stop when the level on pin 6 of TDA936x goes below 2.5 Vdc

Service manual CP-785AF

- 11 -

4 - IC description

4-1 TDA936x TV signal processor - Teletext decoder with embedded µ-Controller.

TV-signal Processor

l Multi-standard vision IF circuit with alignment-free PLL demodulator
l Internal (switchable) time-constant for the IF-AGC circuit
l Source selection between 'Internal' CVBS and external CVBS or Y/C signals
l Integrated chrominance trap circuit
l Integrated luminance delay line with adjustable delay time
l Asymmetrical ‘ delay line type’ peaking in the luminance channel
l Black stretching for non-standard luminance signals
l lntegrated chroma band-pass filter with switchable centre frequency
l Only one reference (12 MHz) crystal required for the µ-Controller, Teletext and the colour decoder
l PAL / NTSC or multistandard colour decoder with automatic search system
l Internal base-band delay line
l RGB control circuit with 'Continuous Cathode Calibration', white point and black level off set

adjustment so that the colour temperature of the dark and the bright parts of the screen can be chosen
independently.

l The Text/OSD signals are internally supplied from the -Controller/Teletext decoder

l Contrast reduction possibility during mixed-mode of OSD and Text signals
l Horizontal synchronisation with two control loops and alignment-free horizontal oscillator
l Vertical count-down circuit
l Vertical driver optimised for DC-coupled vertical output stages
l Horizontal and vertical geometry processing
l Horizontal and vertical zoom function for 16 : 9 applications
l Horizontal parallelogram and bow correction for large screen picture tubes

µ

-Controller

l 80C51 µ-controller core standard instruction set and timing
l 1µs machine cycle
l 32 - 128Kx8-bit late programmed ROM
l 3 - 12Kx8-bit Auxiliary RAM (shared with Display and Acquisition)
l Interrupt controller for individual enable/disable with two level priority
l Two 16-bit Timer/Counter registers
l WatchDog timer
l Auxiliary RAM page pointer
l 16-bit Data pointer
l IDLE and Power Down (PD) mode
l 14 bits PWM for Voltage Synthesis Tuning
l 8-bit A/D converter
l 4 pins which can be programmed as general I/0 pin, ADC input or PWM (6-bit) output

Data Capture

l Text memory 10 pages

Service manual CP-785AF

- 12 -

l Inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle
Page Table (SPT)

l Data Capture for US Closed Caption
l Data Capture for 525/625 line WST, VPS (PDC system A) and Wide Screen Signalling (WSS) bit

decoding Automatic selection between 525 WST/625 WST

l Automatic selection between 625 WST/VPS on line 16 of VBI
l Real-time capture and decoding for WST Teletext in Hardware, to enable optimised µ-processor

throughput

l Automatic detection of FASTEXT transmission
l Real-time packet 26 engine in Hardware for processing accented, G2 and G3 characters
l Signal quality detector for video and WST/VPS data types
l Comprehensive teletext language coverage
l Full Field and Vertical Blanking lnterval (VBI) data capture of WST data

Display

l Teletext and Enhanced OSD modes
l Features of lever 1.5 WST and US Close Caption
l Serial and Parallel Display Attributes
l Single/Double/Quadruple Width and Height for characters
l Scrolling of display region
l Variable flash rate controlled by software
l Enhanced display features including overlining, underlining and italics
l Soft colours using CLUT with 4096 colour palette
l Globally selectable scan lines per row (9/10/13/16) and character matrix [12x10, 12xl3, 12x16

(VxH)]

l Fringing (Shadow) selectable from N-S-E-W direction
l Fringe colour selectable
l Meshing of defined area
l Contrast reduction of defined area
l Cursor
l Special Graphics Characters with two planes, allowing four colours per character
l 32 software redefinable On-Screen display characters
l 4 WST Character sets (GO/G2) in single device (e.g. Latin, Cyrillic, Greek, Arabic)
l G1 Mosaic graphics, Limited G3 Line drawing characters
l WST Character sets and Closed Caption Character set in single device

Data Capture

The Data Capture section takes in the analogue Composite Vidéo and Blanking Signal (CVBS), and
from this extracts the required data, which is then decoded and stored in memory.

The extraction of the data is performed in the digital domain. The first stage is to convert the analogue
CVBS signal into a digital form. This is done using an ADC sampling at 12MHz. The data and clock
recovery is then performed by a Multi-Rate Video Input Processor (MuIVIP). From the recovered data
and clock the following data types are extracted WST Teletext (625/525), Closed Caption, VPS, WSS.
The extracted data is stored in either memory (DRAM) via the Memory Interface or in SFR locations.

Data Capture Features

- Video Signal Quality detector

Service manual CP-785AF

- 13 -

- Data Capture for 625 line WST

- Data Capture for 525 line WST

- Data Capture for US Closed Caption

- Data Capture for VPS data (PDC system A)

- Data Capture for Wide Screen Signalling (WSS) bit decoding

- Automatic selection between 525 WST/625WST

- Automatic selection between 625WST/VPS on line 16 of VBI

- Real-time capture and decoding for WST Teletext in Hardware, to enable optimised microprocessor
throughput

- 10 pages stored On-Chip

- lnventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page
Table (SPT)

- Automatic detection of FASTEXT transmission

- Real-time packet 26 engine in Hardware for processing accented, G2 and G3 characters

- Signal quality detector for WST/VPS data types

- Comprehensive Teletext language coverage

- Full Field and Vertical Blanking Interval (VBI) data capture of WST data

Service manual CP-785AF A

- 14 -

Service manual CP-785AF

- 15 -

Chassis IC marking

OSD languages Capacity Text

CP-785A DW9365/N1/3-BDx

(OTP: TDA9365PS/
N1/5S

English

10 pages Teletext

64K Pan-European,

PINNING

SYMBOL PIN DESCRIPTION

n.u. 1 Port 1.3 Not used.
SCL 2 I2C bus clock line
SDA 3 I2C Data line
SECAM L’ out 4 Port 2.0 : High when L’ selected (PushPull )
OCP 5 Port 3.0 : Over Current Protection
RF AGC in 6 ADC 1 : For factory use only ( High impedance )
Key-in 7 ADC 2 : local key input ( High impedance )
S/SW 8 ADC 3 : Scart Slow switching input
VssC/P 9

digital ground for µ-controller core and peripheral
LED 1 10 port 0.5 ( 8mA current sinking capability )
LED 2 11 port 0.6 ( 8mA current sinking capability )
VSSA 12 analog ground of teletext decoder and digital ground of TV processor
SEC PLL 13 SECAM PLL decoupling
VP2 14 2nd supply voltage TV-processor
DECDIG 15 decoupling digital supply of TV-processor
PH2LF 16 phase-2 filter
PH1LF 17 phase-1 filter
GND3 18 ground 3 for TV-processor
DECBG 19 bandgap decoupling
AVL/EWD 20 East / West drive output
VDRB 21 vertical drive B output
VDRA 22 vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 reference current input
VSC 26 vertical sawtooth capacitor
TUNERAGC 27 tuner AGC output
SIFIN1 28 SIF input 1
SIFIN2 29 SIF input 2
GND2 30 ground 2 for TV processor
SIF AGC 31 AGC sound IF
REF0 32 n.u.
HOUT 33 horizontal output
FBISO 34 flyback input / sandcastle output

Service manual CP-785AF

- 16 -

SYMBOL PIN DESCRIPTION

QSS out 35 QSS intercarrier output
EHT0 36 EHT/Overvoltage protection
PLLIF 37 IF PLL loop filter
IFVO 38 IF video output
VP1 39 main supply voltage TV-processor
CVBSINT 40 internal CVBS input
GND1 41 ground 1 for TV-processor
CVBS/Y 42 external CVBS/Y input
CHROMA 43 chrominance input (SVHS)
AMOUT 44 n.u.
INSSW2 45 2nd RGB insertion input
R2IN 46 2nd R input
G2IN 47 2nd G input
B2IN 48 2nd B input
BCLIN 49 beam current limiter input
BLKIN 50 black current input
R0 51 RED Output
G0 52 GREEN Output
B0 53 BLUE Output
VDDA 54 analog supply of Teletext decoder and digital supply of TV-Processor

(3.3V)
VPE 55 OTP programming supply
VDDC 56 digital supply to core (3.3V)
OSCGND 57 oscillator ground supply
XTALIN 58 crystal oscillator input
XTALOUT 59 crystal oscillator output
RESET 60 reset
VDDP 61 digital supply to periphery (3.3V)
Audio Mute 62 Port 1.0 : Audio mute output (PushPull )
Power 63 Port 1.1 : Power output (PushPull )
IR in 64 Interrupt input 0 : R/C Infrared input

Service manual CP-785AF

- 17 -

Service manual CP-785AF

- 18 -

4-2 MSP3415D Multistandard Sound Processor
The MSP 3415D is designed as a single-chip Multistandard Sound Processor for applications in
analogue and digital TV sets, video recorders, and PC cards.

MSP 3415D features

- sound IF input

- No external filters required

- Stereo baseband input via integrated AD converters

- Two pairs of DA converters

- Two carrier FM or NICAM processing

- AVC : Automatic Volume Correction

- Bass, treble, volume processing

- Full SCART in/out matrix without restrictions

- Improved FM-identification

- Demodulator short programming

- Autodetection for terrestrial TV - sound standards

- Precise bit-error rate indication

- Automatic switching from NICAM to FM/AM or vice versa

- Improved NICAM synchronisation algorithm

- Improved carrier mute algorithm

- Improved AM-demodulation

- Reduction of necessary controlling

- Less external components

Basic Features of the MSP 3415D

Demodulator and NICAM Decoder Section

The MSP 3415D is designed to simultaneously perform digital demodulation and decoding of NICAM­coded TV stereo sound, as well as demodulation of FM or AM mono TV sound. Alternatively, two
carrier FM systems according to the German terrestrial specs can be processed with the MSP 3415D.

The MSP 3415D facilitates profitable multistandard capability, offering the following advantages:

- Automatic Gain Control (AGC) for analogue input: input range: 0.10 - 3 Vpp

- integrated A/D converter for sound-IF input

- all demodulation and filtering is performed on chip and is individually programmable

- easy realisation of all digital NICAM standards (B/G, I, L and D/K)

- FM-demodulation of all terrestrial standards (include identification decoding)

- no external filter hardware is required

- only one crystal clock (18.432 MHz) is necessary

- high deviation FM-mono mode (max. deviation: approx. ±360 kHz)

DSP-Section (Audio Baseband Processing)

- flexible selection of audio sources to be processed

- performance of terrestrial de-emphasise systems (FM, NICAM)

- digitally performed FM-identification decoding and de-matrixing

- digital baseband processing: volume, bass, treble

- simple controlling of volume, bass, treble

Analogue Section