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S/M No. : DSC150BEF0
Service Manual
Color Television
CHASSIS : SC-150
Model : DSC-3220E/3220L
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).
DAEWOO ELECTRONICS Corp.
http : //svc.dwe.co.kr DEC . 2002
Service manual SC-150
Contents
1 - Main features ........................................................................................................................................................ 4
1-1 Specifications .................................................................................................................................................. 4
1-2 Channel table .................................................................................................................................................. 8
1-3 ATSS sorting method ....................................................................................................................................... 11
2 - Safety instruction ................................................................................................................................................. 13
3 - Alignment instructions ........................................................................................................................................ 14
3-1 Microcontroller configuration : Service mode ................................................................................................... 14
3-2 Service mode navigation ................................................................................................................................. 14
3-3 Microcontroller configuration : Option .............................................................................................................. 15
3-4 TV set Alignment ............................................................................................................................................. 15
3-4-1 Local oscillator alignment .................................................................................................................... 15
3-4-2 G2 alignment ....................................................................................................................................... 15
3-4-3 White balance ..................................................................................................................................... 15
3-4-4 Focus .................................................................................................................................................. 15
3-4-5 Vertical geometry ................................................................................................................................ 15
3-4-6 Horizontal picture centring ................................................................................................................... 16
3-4-7 East/West correction ........................................................................................................................... 16
3-4-8 AGC .................................................................................................................................................... 17
4 - IC description ....................................................................................................................................................... 18
4-1 VCT383xA TV signal processor - Teletext decoder with embedded 8 bit -
Controller ............................................................................................................................................................ 18
4-1-1 Block diagram off the VCT ................................................................................................................... 18
4-1-2 TV-signal Processor ........................................................................................................................... 18
4-1-2 -Controller ....................................................................................................... ................................... 19
4-1-4 Teletext Features ................................................................................................................................ 19
4-1-5 Displaty OSD Features ...................................................................................................................... 20
4-1-6 Audio Features ................................................................................................................................... 20
4-1-7 General Features ............................................................................................................................... 20
4-1-8 Data Capture ....................................................................................................................................... 20
4-1-9 Data Capture Features ........................................................................................................................ 20
4-1-10 TV processor version and -Controller capacity .............................................................................. 21
4-1-11 IC marking and version ....................................................................................................................... 21
4-1-12 Pinning ................................................................................................................................................ 21
4-2 MSP341x Multistandard Sound Processor ................................................................................................... 24
4-2-1 Basic Features of the MSP 341x ......................................................................................................... 24
4-3 TDA4470 - Multistandard Video-IF and Quasi Parallel Sound Processor ...................................................... 28
4-3-1 Description .......................................................................................................................................... 28
4-3-2 Features .............................................................................................................................................. 28
4-3-3 Pinning ................................................................................................................................................ 28
4-3-4 Block diagram .................................................................................................................................... 29
4-4 TDA894xJ Stereo Audio Amplifier ................................................................................................................. 30
4-4-1 Features ............................................................................................................................................... 30
4-5 TDA835xJ Vertical Amplifier ........................................................................................................................... 32
4-5-1 TDA8357J ........................................................................................................................................... 32
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Service manual SC-150
4-5-2 TDA8358J .............................................................................................................................................. 33
4-6 TDA6107Q .......................................................................................................................................................... 33
4-7 24C16 - 16 Kb EEPROM .................................................................................................................................... 35
4-8 STR - F6653 ....................................................................................................................................................... 36
4-8-1 General description ............................................................................................................................... 36
4-8-2 Features ................................................................................................................................................. 36
4-8-3 Block diagram ....................................................................................................................................... 36
4-8-4 Pin description ...................................................................................................................................... 37
4-8-5 Control part - electrical characteristics ................................................................................................. 37
4-8-6 MOSFET electrical characteristics ....................................................................................................... 38
4-9 CXA1315P ......................................................................................................................................................... 39
4-9-1 General description................................................................................................................................ 39
4-9-2 Features ................................................................................................................................................ 39
4-9-3 Block diagram ........................................................................................................................................ 39
4-9-4 Pin Description........................................................................................................................................ 40
4-10 CXA1315P ..........................................................................................................................................................40
4-10-1 General description ................................................................................................................................ 40
4-10-2 Features ................................................................................................................................................ 40
4-10-3 Block diagram ........................................................................................................................................ 40
4-10-4 Pin Description........................................................................................................................................ 40
4-11 LA6515 ..........................................................................................................................................................40
4-11-1 General description ................................................................................................................................ 40
4-11-2 Features ................................................................................................................................................ 40
4-11-3 Block diagram ........................................................................................................................................ 40
4-11-4 Pin Description........................................................................................................................................ 40
5 - Circuit description .................................................................................................................................................. 43
5-1 Block diagram .................................................................................................................................................... 43
5-2 IF section ............................................................................................................................................................ 44
5-2-1 Block diagram ....................................................................................................................................... 44
5-2-2 Vision IF Amplifier .................................................................................................................................. 44
5-2-3 Tuner-and VIF-ACG ................................................................................................................................ 45
5-2-4 FPLL, VCO and AFC .............................................................................................................................. 45
5-2-5 Video Demodulation and Amplifier ...................................................................................................... 46
5-5-6 Sound IF Amplifier and SIF-AGC ....................................................................................................... 46
5-2-7 Quasi-Parallel-Sound (QPS) Mixer ......................................................................................................... 46
5-2-8 Standard Switch .................................................................................................................................... 46
5-2-9 L Switch .................................................................................................................................................. 46
5-2-10 Internal Voltage Stabiliser ..................................................................................................................... 46
5-3 Video - VCT description ...................................................................................................................................... 47
5-3-1 Introduction ............................................................................................................................................ 47
5-3-2 Video Front-end ..................................................................................................................................... 47
5-3-3 Input Selector ........................................................................................................................................ 47
5-3-4 Clamping ................................................................................................................................................ 47
5-3-5 Automatic Gain Control ........................................................................................................................ 47
5-3-6 Digitally Controlled Clock Oscillator ..................................................................................................... 47
5-3-7 Analogue Video Output ........................................................................................................................ 47
5-3-8 Adaptive Comb Filter (VCT3834A only) ................................................................................................ 48
5-3-9 Color Decoder ....................................................................................................................................... 48
5-3-10 Horizontal Scaler ................................................................................................................................... 48
5-3-11 Video Sync Processing ........................................................................................................................ 49
5-3-12 Display Processing ................................................................................................................................ 49
5-3-13 Chroma Transient Improvement ............................................................................................................ 49
5-3-14 Video Back-end ..................................................................................................................................... 49
5-3-15 CRT Measurement and Control ........................................................................................................... 50
5-3-16 Average Beam Current Limiter ............................................................................................................. 50
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Service manual SC-150
5-3-17 Analogue RGB Insertion .................................................................................................................... 50 .
5-3-18 Fast-Blank Monitor ..................................................................................................... ........................... 50
5-3-19 Vertical and East/West Deflection .................................................................................... ................... 50
5-3-20 EHT Compensation ........................................................................................................ ........................ 51
5-3-21 Reset Function ......................................................................................................... ............................. 51
5-3-22 Standby and Power-On .................................................................................................. ...................... 51
5-4 Micro-controller ...............................................................................................................
.......................................... 51
5-4-1 Introduction........................................................................................................................................... 51
5-4-2 CPU ...................................................................................................................................................... 51
5-4-3 -Controller I/O pin configuration and function ............................................................................... 52
5-4-4 Tuning .................................................................................................................................................. 52
5-4-5 Automatic Format switching and WSS ............................................................................................... 52
5-4-6 EXTERNAL source control logic ........................................................................................................... 54
5-4-7 Over Current Protection ........................................................................................................................ 55
5-5Telete Displa ................................................................................................................................................. 55
xt y
5-6 Sound processing ............................................................................................................................................... 56
5-6-1 Analogue sound IF-input section ............................................................................................................ 56
5-6-2 Quadr ture Mix ................................................................................................................................ 56
a ers
5-6-3 Phase and AM discr imination........................................................................................................... 56
5-6-4 NICAM decoder................................................................................................................................... 57
.
5-6-5 DSP section .......................................................................................................................................... 57
5-6-6 Sound Mode switching .......................................................................................................................... 57
5-7 Sound amplification ........................................................................................................................................... 57
5-7-1 Power amplifier..................................................................................................................................... 57
5-7-2 Mode selection ....................................................................................................................................... 58
5-8 Vertical deflection............................................................................................................................................. 58
5-8-1 Flybac voltage..................................................................................................................................... 58
k
5-8-2 Protection.............................................................................................................................................. 58
5-8-3 Guard circuit.......................................................................................................................................... 58
5-8-4 Damping resistor.................................................................................................................................. 58
.
5-8-5 EAST -WEST Amplifier (TD A8358J only) .............................................................................................. 58
.
5-9 Power supply (STR F6653) .............................................................................................................................. 59
..
5-9-1 STR-F6654 gener descrption......................................................................................................... 59
aral i
5-9-2 Power supply primary par t operations ................................................................................................... 59
5-10TV start-up, TV normal run and stand by mode operations ............................................................................... 63
5-10-1 TV start-up operations......................................................................................................................... 63
.
5-10-2 TV normal run and stand-by mode operations ....................................................................................... 64
6 - Service parts list................................................................................................................................................... 69
6 -1 Service part list ........................................................................................................................................... 69
6 -2 Service part list option ............................................................................................................................... 79
7 - Exploded View ........................................................................................................................................................ 80
8 - PCB Layout ........................................................................................................................................................ 81
8 -1 MAIN PCB ................................................................................................................................................... 81
8 -2 UNION PCB ................................................................................................................................................... 82
9 - Circuit Diagram ........................................................................................................................................................ 83
9 - 1 Circuit Diagram(MAIN) .................................................................................................................................... 83
9 - 2 Circuit Diagram(UNION) .................................................................................................................................. 84
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Service manual SC-150
1- Main Features
1-1 Specifications
TV standard PAL - SECAM B/G D/K, PAL I/I, SECAM L/L'
Sound system NICAM B/G, I, D/K, L,
FM 2Carrier B/G, D/K
Power consumption 32" 16:9 Real Flat : 110W approx.
Sound Output Power 7W x2 (at 1KHz, 60% mod, 10% THD)
Speaker 10W(Normal) 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 32" : 76Cm
Channel indication On Screen Display
program Selection 100 programmes
Aux. terminal EURO-SCART 1 : Audio / Video In and Out, R/G/B In, Slow and
Fast switching.
EURO-SCART 2 : Audio / Video In and Out, SVHS In.
Monitor Out
AV3 : Audio-Video Jack on right side of cabinet.
Headphone jack (3.5 mm) on right side of cabinet
SVHS3 : Jack on right side of cabinet - sound input common with AV3.
Remote Control Unit R-46G22
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Service manual SC-150
Specification matrix
Chassis Name SC-150
Model Name DSC-3220E DSC-3220L
VCT Version 3834
Software Version A
Remote Control R46G22
PCB Serial Number 4859812224(MAIN)/ 4959812324(Union)
Tube 16:9 Real Flat
SVHS 3
"Picture Improvements,
Comb Filter, Horizontal Scaler"
Teletext Split Screen
Formats Available in Video Mode Auto / 4:3 / 14:9 / Zoom 14:9 /Zoom
16:9 / Full Screen
AV2 Monitor Output
MSP Version 3410G 3411G
Sound Dffects Off / Spatial Off / Spatial / Panorama /
Dolby Virtual
Graphic Equalizer
AV3 Audio Input Dedicated
Teletext Page Memory 10 Page
Top Teletext Available : Selectable in factory /
Service mode by option bits
Flof Teletext Available : Selectable in factory /
Service mode by option bits
Text Character Support "Pan-European Latin, Cyrillic, Greek"
OSD Languages "English, French, German, Italian, Spanish,Dutch, Danish,
Finnish, Norwegian, Swedish, Greek,Polish, Czech, Slovakian,
Romanian, Russian, Bulgarian, Hungarian
Tuner Options "Philips, Alps,Partsnic"
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Service manual SC-150
21 Pin EURO-SCART 1 :
Pin Signal Description Matching value
1 Audio Output Right 0.5 Vrms, Impedance < 1 , ( RF 54% Mod )
2 Audio Input Right 0.5 Vrms, Impedance > 10
3 Audio Output Left 0.5 Vrms, Impedance < 1 , ( RF 54% Mod )
4 Audio Earth
5 Blue Earth
6 Audio Input Left 0.5 Vrms, Impedance > 10
7 Blue Input 0.7 Vpp