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daewoo_-_cp885


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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




                                                                                        -1-
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




                                                                                        -2-
                                                                                                                              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




                                                                                      -3-
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




                                              -4-
                                                                                                                     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"




                                                                                    -5-
 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 



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