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S/M No. : TWP895BEF0
Service Manual
Colour Television
CHASSIS
WP-895
WP-895F
CP-885
CP-885F
DAEWOO ELECTRONICS CO., LTD
http : //svc.dwe.co.kr AUG. 2001
Service manual WP-895/895F. CP885/885F
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 ma n WP-895/895F. CP885/885F
ual
4-5-2 TDA8358J .............................................................................................................................................. 33
4-6 TDA6107Q .......................................................................................................................................................... 34
4-7 24C16 - 16 Kb EEPROM .................................................................................................................................... 37
4-8 STR - F6653 ....................................................................................................................................................... 38
4-8-1 General description ............................................................................................................................... 38
4-8-2 Features ................................................................................................................................................. 38
4-8-3 Block diagram ....................................................................................................................................... 38
4-8-4 Pin description ...................................................................................................................................... 39
4-8-5 Control part - electrical characteristics ................................................................................................. 39
4-8-6 MOSFET electrical characteristics ....................................................................................................... 40
5 - Circuit description .................................................................................................................................................. 41
5-1 Block diagram .................................................................................................................................................... 41
5-2 IF section ............................................................................................................................................................ 42
5-2-1 Block diagram ....................................................................................................................................... 42
5-2-2 Vision IF Amplifier .................................................................................................................................. 42
5-2-3 Tuner-and VIF-ACG ................................................................................................................................ 43
5-2-4 FPLL, VCO and AFC .............................................................................................................................. 43
5-2-5 Video Demodulation and Amplifier ...................................................................................................... 44
5-5-6 Sound IF Amplifier and SIF-AGC ....................................................................................................... 44
5-2-7 Quasi-Parallel-Sound (QPS) Mixer ......................................................................................................... 44
5-2-8 Standard Switch .................................................................................................................................... 44
5-2-9 L' Switch .................................................................................................................................................. 44
5-2-10 Internal Voltage Stabiliser ..................................................................................................................... 44
5-3 Video - VCT description ...................................................................................................................................... 45
5-3-1 Introduction ............................................................................................................................................ 45
5-3-2 Video Front-end ..................................................................................................................................... 45
5-3-3 Input Selector ........................................................................................................................................ 45
5-3-4 Clamping ................................................................................................................................................ 45
5-3-5 Automatic Gain Control ........................................................................................................................ 45
5-3-6 Digitally Controlled Clock Oscillator ..................................................................................................... 45
5-3-7 Analogue Video Output ........................................................................................................................ 45
5-3-8 Adaptive Comb Filter (VCT3834A only) ................................................................................................ 46
5-3-9 Color Decoder ....................................................................................................................................... 46
5-3-10 Horizontal Scaler ................................................................................................................................... 46
5-3-11 Video Sync Processing ........................................................................................................................ 47
5-3-12 Display Processing ................................................................................................................................ 47
5-3-13 Chroma Transient Improvement ............................................................................................................ 47
5-3-14 Video Back-end ..................................................................................................................................... 47
5-3-15 CRT Measurement and Control ........................................................................................................... 48
5-3-16 Average Beam Current Limiter ............................................................................................................. 48
5-3-17 Analogue RGB Insertion ...................................................................................................................... 48
5-3-18 Fast-Blank Monitor ................................................................................................................................ 48
5-3-19 Vertical and East/West Deflection ....................................................................................................... 49
5-3-20 EHT Compensation ................................................................................................................................ 49
5-3-21 Reset Function ...................................................................................................................................... 49
5-3-22 Standby and Power-On ........................................................................................................................ 49
5-4 Micro-controller ...............................................................................................................
.......................................... 49
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Service manual WP-895/895F. CP885/885F
5-4-1 Introduction........................................................................................................................................... 49
5-4-2 CPU ...................................................................................................................................................... 49
5-4-3 -Controller I/O pin configuration and function ............................................................................... 50
5-4-4 Tuning .................................................................................................................................................. 50
5-4-5 Automatic Format switching and WSS ............................................................................................... 50
5-4-6 EXTERNAL source control logic ........................................................................................................... 51
5-4-7 Over Current Protection ........................................................................................................................ 53
5-5Telete Displa ................................................................................................................................................. 53
xt y
5-6 Sound processing ............................................................................................................................................... 54
5-6-1 Analogue sound IF-input section ............................................................................................................ 54
5-6-2 Quadr ture Mix ................................................................................................................................ 54
a ers
5-6-3 Phase and AM discr imination........................................................................................................... 54
5-6-4 NICAM decoder................................................................................................................................... 55
.
5-6-5 DSP section .......................................................................................................................................... 55
5-6-6 Sound Mode switching .......................................................................................................................... 55
5-7 Sound amplification ........................................................................................................................................... 55
5-7-1 Power amplifier..................................................................................................................................... 55
5-7-2 Mode selection ....................................................................................................................................... 56
5-8 Vertical deflection............................................................................................................................................. 56
5-8-1 Flybac voltage..................................................................................................................................... 56
k
5-8-2 Protection.............................................................................................................................................. 56
5-8-3 Guard circuit.......................................................................................................................................... 56
5-8-4 Damping resistor.................................................................................................................................. 56
.
5-8-5 EAST -WEST Amplifier (TD A8358J only) .............................................................................................. 56
.
5-9 Power supply (STR F6653) .............................................................................................................................. 57
..
5-9-1 STR-F6654 gener descrption......................................................................................................... 57
aral i
5-9-2 Power supply primary par t operations ................................................................................................... 57
5-10TV start-up, TV normal run and stand by mode operations ............................................................................... 61
5-10-1 TV start-up operations......................................................................................................................... 61
.
5-10-2 TV normal run and stand-by mode operations ....................................................................................... 62
6 - Service parts list................................................................................................................................................... 67
7 - Exploded View ........................................................................................................................................................ 75
7-1 DWX-28W5 ....................................................................................................................................................... 75
7-2 DWF-28W8 ....................................................................................................................................................... 76
7-3 D T F-29U8 ....................................................................................................................................................... 77
7-4 D T P-28A7 ....................................................................................................................................................... 78
7-5 D T P-28B1 ....................................................................................................................................................... 79
7-6 D T P-28G7 ....................................................................................................................................................... 80
7-7 D T P-28G8 ....................................................................................................................................................... 81
8 - PCB Layout
9 - Circuit Diagram
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Service manual WP 895/895F, CP885/885F
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 21" Real Falt : 59 W approx.
28" 4:3, FST : 69 W approx.
29" 4:3, REAL FALT : 74 W approx.
28" 16:9, WIDE : 69 W approx.
Sound Output Power 21" : 4.5W x 2 (at 1kHz, 60% mod, 10%THD)
28", 29" : 7W x 2 (at 1kHz, 60% mod, 10%THD)
Speaker 21" : 7W 8 ohm x2
28", 29" : 12W 8 ohm x2
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 21" : 51 cm
28" : 66 cm
29" : 68 cm
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(option)
AV3 : Audio-Video Jack on front of cabinet.
Headphone jack (3.5 mm) on front of cabinet
SVHS3 (option) : Jack on front of cabinet - sound input common with AV3.
Remote Control Unit R-46G22
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Service manual WP 895/895F, CP885/885F
Specification matrix
CHASSIS NAME WP895 WP895F CP885 CP885F
VCT VERSION 3834 3834 3832 3834
SOFTWARE VERSION A A B A
REMOTE CONTROL R46G22 R46G22 R46G22 R46G22
PCB SERIAL NUMBER 4859805093 4859805193 4859805093 4859805193
TUBE 16:09 16:9 REAL FLAT 4:03 4:3 REAL FLAT
SVHS3
"PICTURE IMPROVE-
MENTS, COMB FILTER,
HORIZONTAL SCALER"
TELETEXT SPLIT SCREEN
FORMATS AVAILABLE IN AUTO / 4:3 / 14:9 / ZOOM 14:9 / AUTO / 4:3 / 14:9 / ZOOM 14:9 / AUTO / FULL SCREEN / 14:9 / AUTO / FULL SCREEN / 14:9 /
VIDEO MODE ZOOM 16:9 / FULL SCREEN ZOOM 16:9 / FULL SCREEN 16:9 16:9 / WATERGLASS
AV2 MONITOR OUTPUT
MSP VERSION (OPTION) 3410 3411 3410 3411 3410 3415 3410 3411
SOUND EFFECTS OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL
/ PANORAMA / / PANORAMA / / PANORAMA /
VIRTUAL VIRTUAL VIRTUAL
DOLBY DOLBY DOLBY
GRAPHIC EQUALIZER
AV3 AUDIO INPUT DEDICATED DEDICATED DEDICATED DEDICATED DEDICATED AV2 COMMON DEDICATED DEDICATED
TELETEXT PAGE MEMORY 10 PAGE 10 PAGE 10 PAGE 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 "Pan-European Latin, Cyrillic, Greek"
SUPPORT
OSD LANGUAGES "English, French, German, Italian, Spanish, Dutch, Danish, Finnish, Norwegian, Swedish, Greek, Polish, Hungarian, Czech, Slovakian, Roma-
nian, Russian."
TUNER OPTIONS "Philips, ALPS"
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Service manual WP 895/895F, CP885/885F
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