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Daewoo Colour television Service Manual

Summary of Colour television

  • Page 1

    Service manual s/m no. : twp895bef0 daewoo electronics co., ltd http : //svc.Dwe.Co.Kr aug. 2001 colour television chassis wp-895 wp-895f cp-885 cp-885f.

  • Page 2

    - 1 - contents 1 - main features ........................................................................................................................................................ 4 1-1 specifications ................................................................................................

  • Page 3

    - 2 - 4-5-2 tda8358j .............................................................................................................................................. 33 4-6 tda6107q ...........................................................................................................................

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    Fo - 3 - 5-4-1 introduction........................................................................................................................................... 49 5-4-2 cpu ...........................................................................................................................

  • Page 5

    - 4 - 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. Sound output power 21” : 4.5w x 2 (...

  • Page 6

    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...

  • Page 7

    - 6 - 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 2 audio input right 0.5 vrms, impedance > 10 3 audio output left 0.5 vrms, impedance 4 audio earth 5 blue earth 6 audio input left 0.5 vrms, impedance > 1...

  • Page 8

    - 7 - service manual wp 895/895f, cp885/885f 19 video output 1 vpp 3db, impedance 75 ( monitor output ) - not available for cp885 20 video input, y in. 1 vpp 3db, impedance 75 21 common earth.

  • Page 9

    - 8 - service manual wp 895/895f, cp885/885f ch europe ccir france gb(ireland) east oirt c01 46.25 - 47.75 49.75 c02 48.25 55.75 (l’) 53.75 59.25 c03 55.25 60.5 (l’) 61.75 77.25 c04 62.25 63.75 (l’) 175.25 85.25 c05 175.25 176.00 183.25 93.25 c06 182.25 184.00 191.25 175.25 c07 189.25 192.00 199.25 ...

  • Page 10

    - 9 - service manual wp 895/895f, cp885/885f ch europe ccir france gb(ireland) east oirt c42 639.25 639.25 639.25 639.25 c43 647.25 647.25 647.25 647.25 c44 655.25 655.25 655.25 655.25 c45 663.25 663.25 663.25 663.25 c46 671.25 671.25 671.25 671.25 c47 679.25 679.25 679.25 679.25 c48 687.25 687.25 6...

  • Page 11

    - 10 - service manual wp 895/895f, cp885/885f ch europe ccir france gb(ireland) east oirt s10 168.25 212.75 - 168.25 s11 231.25 224.75 - 231.25 s12 238.25 236.75 - 238.25 s13 245.25 248.75 255.25 245.25 s14 252.25 260.75 263.25 252.25 s15 259.25 272.75 271.25 259.25 s16 266.25 284.75 279.25 266.25 s...

  • Page 12

    - 11 - service manual wp 895/895f, cp885/885f 1-3 atss sorting method the tv set sweeps all the tv bands from beginning of vhf to end of uhf. The tv controlling software for each program checks if a vps cni code is transmitted ( this system exists for ger man, swiss and austrian transmissions). If n...

  • Page 13

    - 12 - service manual wp 895/895f, cp885/885f the sor ting order within group ii, iii, and iv is based on the channel frequency. The pro gram with the lo west frequency is allocated the first rank in its group, and so f orth until the last program of the group which has the highest fr equency. If fr...

  • Page 14

    - 13 - service manual wp 895/895f, cp885/885f 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 h...

  • Page 15

    - 14 - service manual wp 895/895f, cp885/885f 3 - alignment instructions 3-1 microcontroller con figuration : service mode to switch the tv set into service mode please see instruction below. 1 - select pr. Number 91 2 - adjust sharpness to minimum and exit all menu. 3 - quickly press the key sequen...

  • Page 16

    - 15 - service manual wp 895/895f, cp885/885f 3-3 microcontroller con figuration : option bits these option bits are availa ble from ser vice mode. First find the option control, and then use keys 0...7 on the remote keypad to control bits 0 to 7 respect ively. The table below shows the options avai...

  • Page 17

    Hor paral h bow hor width pararola 3-4-6- horizontal picture centring adjust hor cen(horizontal center) to have the picture in the center of the screen. 3-4-7- eau/west comection adjust the parabola, hor width, corner, hor paral, ew trapez, h bow, to compensate for geometrical distorrin, service man...

  • Page 18

    - 17 - service manual wp 895/895f, cp885/885f corner ew trapez 3-4-8- agc - adjust the antenna signal level at 70 db v 2 - tune a colour bar pattern. - find the “agc” item in service mode. - adjust agc volume ( rb10 ) to bring the cursor to central position : 32..

  • Page 19

    - 18 - service manual wp 895/895f, cp885/885f 4 - ic description 4-1 vct383xa tv signal processor - teletext decoder with embedded 8 bit - controller. 4-1-1- block diagram of the vct 4-1-2- tv-signal processor • four composite video inputs, two s-vhs inputs • analogue yc r c b input • composite vide...

  • Page 20

    - 19 - service manual wp 895/895f, cp885/885f • horizontal scaling ( 0.25 to 4 ) • panoramavision • black-level expander • dynamic peaking • soft limiter (gamma correction) • colour transient improvement • programmable rgb matrix • analogue rgb/fastblank input • half-contrast switch • picture frame ...

  • Page 21

    - 20 - service manual wp 895/895f, cp885/885f • high-level command language • flof (fastext), and top support • 10 pages memory on chip (10kb) 4-1-5- display osd features • 3kb osd ram on chip • wst level 1.5 compliant • wst level 2 parallel attributes • 32 foreground/background colours • programmab...

  • Page 22

    - 21 - service manual wp 895/895f, cp885/885f ic marking english, french, german, italian, spanish, dutch, danish, finnish, norwegian, swedish, greek, polish, hungarian, czech, slovakian, romanian, russian. • inventory of transmitted teletext pages stored in the page table • signal quality detector ...

  • Page 23

    - 22 - service manual wp 895/895f, cp885/885f 14 gndaf supply ground, analog front-end 15 vsupaf supply supply voltage, analog front-end 16 cbin in analog component cb input 17 cin1 in analog chroma 1 input 18 cin2/crin in analog chroma 2 input / analog component cr input 19 vin1 in analog video 1 i...

  • Page 24

    - 23 - service manual wp 895/895f, cp885/885f ocp 64 63 62 61 60 58 57 56 55 48 46 45 44 43 42 41 40 39 38 37 36 34 35 33 47 54 53 52 51 50 49 59 kb led mute sda scl reset xtal in osc gnd gnd s/b 3.3v gnd gnd gnd xref vrd gnd 5v b out g out r out svm out rsw2 rsw1 gnd sense ew vertq vert hflb power ...

  • Page 25

    - 24 - service manual wp 895/895f, cp885/885f 4-2 msp341x multistandard sound processor the msp 341x is designed as a single-chip multistandard sound processor for applications in analogue and digital tv sets, video recorders, and pc cards. The msp3411 has all functions of msp3410 with the addition ...

  • Page 26

    - 25 - service manual wp 895/895f, cp885/885f - high deviation fm-mono mode (max. Deviation: approx. ±360 khz) 4-2-1-2 dsp-section (audio baseband processing) - flexible selection of audio sources to be processed - performance of terrestrial de-emphasise systems (fm, nicam) - digitally performed fm-...

  • Page 27

    - 26 - service manual wp 895/895f, cp885/885f tv standards tv position of sound sound modulation color system country system carrier (mhz) b/g 5.5 / 5.7421875 fm stereo pal germany b/g 5.5 / 5.85 fm-mono / nicam pal scandinavia, spain l 6.5 / 5.85 am-mono / nicam secam-l france i 6.0 / 6.552 fm-mono...

  • Page 28

    - 27 - service manual wp 895/895f, cp885/885f 12 tp in / out test pin 13 tp out test pin 14 nc not connected 15 tp out test pin 16 tp out test pin 17 tp out test pin 18 dvsup digital power supply +5v 19 dvss digital ground 20 nc not connected 21 nc not connected 22 nc not connected 23 nc not connect...

  • Page 29

    - 28 - service manual wp 895/895f, cp885/885f pin no. Pin name type short description 59 ana_in1- in if common 60 nc not connected 61 testen in test pin 62 xtal_in in crystal oscillator 63 xtal_out out crystal oscillator 64 nc test pin 4-3 tda 4470-multistandard video-if and quasi parallel sound pro...

  • Page 30

    - 29 - service manual wp 895/895f, cp885/885f pin symbol function 19 v sw afc switch 20, 21 v vco vco circuit 22 v afc afc output 23 v s supply voltage 24 v o, fm intercarrier output 25 v o, am af output-am sound 26 r comp offset compensation 27, 28 v i,sif2 sif2 input (symmetrical) 4-3-4 block diag...

  • Page 31

    - 30 - service manual wp 895/895f, cp885/885f pin symbol description 1 out1- negative loudspeaker terminal 1 2 gnd1 ground channel 1 3 vcc1 supply voltage channel 1 4 out1+ positive loudspeaker terminal 1 5 n.C. Not connected 6 in1+ poitive input1 7 n.C. Not connected 8 in1- negative input1 9 in2- n...

  • Page 32

    - 31 - service manual wp 895/895f, cp885/885f block diagram tda8944j.

  • Page 33

    - 32 - service manual wp 895/895f, cp885/885f 4-5 tda835xj vertical amplifier the tda835xj are power circuit for use in 90 o and 110 o colour deflection systems for field frequencies of 25 to 200hz and 16/9 picture tubes. The circuit provides a dc driven vertical deflection output circuit, operating...

  • Page 34

    - 33 - service manual wp 895/895f, cp885/885f 4-5-2 tda8358j an east-west output stage is provided that is able to sink current from the diode modulator circuit. Features : - few external components - highly efficient fully dc-coupled vertical output bridge circuit - short rise and fall time of the ...

  • Page 35

    - 34 - service manual wp 895/895f, cp885/885f.

  • Page 36

    - 35 - service manual wp 895/895f, cp885/885f 4-6 tda6107q the tda6107q includes three video output amplifiers in one plastic dil-bent-sil 9-pin medium power package, using high voltage dmos technology, and is intended to drive the three cathodes of a colour crt directly. To obtain maximum performan...

  • Page 37

    - 36 - service manual wp 895/895f, cp885/885f block diagram tda6107q.

  • Page 38

    - 37 - service manual wp 895/895f, cp885/885f 4-6 24c16 - 16 kb eeprom features : - 16 kbit serial i2c bus eeprom - single supply voltage : 4.5 v to 5.5 v - 1 million erase/write cycles (minimum) - 40 year data retention (minimum) pin description pin no. Name description 1, 2, 3 e0, e1, e2 device ad...

  • Page 39

    - 38 - service manual wp 895/895f, cp885/885f 4-8 str - f6653 4-8-1 general description the str-f6653 is an hybrid ic with a build-in mosfet and control ic, designed for flyback converter type switch mode power supply applications. 4-8-2 features - small sip fully isolated molded 5 pins package - ma...

  • Page 40

    - 39 - service manual wp 895/895f, cp885/885f 4-8-4 pins description pin name symbol description 1 overcurrent / feedback o.C.P./ f.B. Input of over current detection signal and feedback signal 2 source s mosfet source 3 drain d mosfet drain 4 supply v in input of power supply for control circuit 5 ...

  • Page 41

    - 40 - service manual wp 895/895f, cp885/885f description 4-7-6 mosfet electrical characteristics ic pins rating number min. Type max drain-to-source break 3-2 v dss 650 - - v voltage drain leakage current 3-2 i dss - - 300 a on-resistance 3-2 r ds (on) - - 1.95 switching time 3-2 tf - - 2 50 noec t...

  • Page 42

    - 41 - service manual wp 895/895f, cp885/885f 5 - circuit description 5-1 block diagram.

  • Page 43

    - 42 - service manual wp 895/895f, cp885/885f 5-2 if section 5-2-1 block diagram the video if signal (vif) is fed through a saw filter to the differential input (pin 6-7) of the vif amplifier. 5-2-2 vision if amplifier this amplifier consists of three ac-coupled amplifier stages. Each differential a...

  • Page 44

    - 43 - service manual wp 895/895f, cp885/885f saw filters ref. Standard features k3953m b/g - d/k - i - l/l’ - if filter for video application - tv if filter with nyquist slopes at 33.9 mhz and 38.9 mhz - constant group delay k9650m b/g - d/k - i - l/l’ - if filter for audio application - tv if audi...

  • Page 45

    - 44 - service manual wp 895/895f, cp885/885f 5-2-5 video demodulation and amplifier the video if signal, which is applied from the gain controlled if amplifier, is multiplied with the in-phase component of the vco signal. The video demodulator is designed for low distortion and large bandwidth. The...

  • Page 46

    - 45 - service manual wp 895/895f, cp885/885f 5-3 video - vct description 5-3-1 introduction the vct 38xxa includes complete video, display, and deflection processing. All processing is done digitally, the video front-end and video back-end are interfacing to the analogue world. Most functions can b...

  • Page 47

    - 46 - service manual wp 895/895f, cp885/885f 5-3-8 adaptive comb filter (vct3834a only) the adaptive comb filter is used for high-quality luminance/chrominance separation for pal or ntsc signals. The comb filter improves the luminance resolution (bandwidth) and reduces interferences like cross-lumi...

  • Page 48

    - 47 - service manual wp 895/895f, cp885/885f 5-3-11 video sync processing to extract the sync information from the video signal, a linear phase low-pass filter eliminates all noise and video contents above 1 mhz. The sync is separated by a slicer; the sync phase is measured. A variable window can b...

  • Page 49

    - 48 - service manual wp 895/895f, cp885/885f 5-3-15 crt measurement and control the display processor is equipped with an 8-bit adc for all measuring purposes. The adc is connected to the sense input pin. Cutoff and white-drive current measurement are carried out during the vertical blanking interv...

  • Page 50

    - 49 - service manual wp 895/895f, cp885/885f 5-3-20 eht compensation the vertical waveform can be scaled according to the average beam current. This is used to compensate the effects of electric high-tension changes due to beam current variations. Eht compensation for east/west deflection is done w...

  • Page 51

    - 50 - service manual wp 895/895f, cp885/885f configuration stand by tv on 1 power push pull low push pull high switch off / on smps 2 agc high impedance high impedance tuner agc level input – for factory use only 5 mod sw high impedance push pull high = negative modulation, low = positive modulatio...

  • Page 52

    - 51 - service manual wp 895/895f, cp885/885f format zoom factor – tv with description application name(osd) 16:9 crt vertical horizontal 4:3 100% 75% picture is centred with standard 4/3 picture with black bars at the left 576 active lines and right hand side of the display 14:9 114% 87% picture is...

  • Page 53

    - 52 - service manual wp 895/895f, cp885/885f the following schematic, illustrates the logic of control for the two scart connectors. The terms used in the schematic are described below ; 1. Auto represents a situation where the television has self-selected its picture source. This could be when the...

  • Page 54

    - 53 - service manual wp 895/895f, cp885/885f can always be overridden by the user after the event. Each line on the diagram, with its associated text, represents the exact conditions under which the change of state will occur. Sometimes this will be accompanied by another action which will be autom...

  • Page 55

    - 54 - service manual wp 895/895f, cp885/885f osd language c c c teletext language esc mapping 12 13 14 teletext language 0 0 0 english english latin 0 0 1 german german latin 0 1 0 swedish/finnish swedish/finnish latin 0 1 1 italian italian latin 1 0 0 french french latin 1 0 1 spanish spanish lati...

  • Page 56

    - 55 - service manual wp 895/895f, cp885/885f 5-6-4 nicam decoder in case of nicam - mode, the phase samples are decoded according the dqpsk - coding scheme. The output of this block contains the original nicam bitstream. 5-6-5 dsp section all audio baseband functions are performed by digital signal...

  • Page 57

    - 56 - service manual wp 895/895f, cp885/885f 5-7-2 mode selection the tda894xj has several functional modes, which can be selected by applying the proper dc voltage to pin mode. Mute : in this mode the amplifier is dc biased but not operational (no audio output). This allows the input coupling capa...

  • Page 58

    - 57 - service manual wp 895/895f, cp885/885f 5-9 power supply (str f6654) 5-9-1 str-f6654 general description the str-f6654 is an hybrid ic with a build-in mosfet and control ic, designed for flyback converter type switch mode power supply applications. 5-9-2 power supply primary part operations an...

  • Page 59

    - 58 - service manual wp 895/895f, cp885/885f when the power switch is pushed on, v in increases slowly. During this time, c806 is charged through r802. As soon as v in reaches 16v, the str-f6654 control circuit starts operating. Then, v in is obtained by smoothing the winding voltage which appears ...

  • Page 60

    - 59 - service manual wp 895/895f, cp885/885f 5-9-2-2 str-f6654 oscillating operation.

  • Page 61

    - 60 - service manual wp 895/895f, cp885/885f when the mosfet is on, the str-f6654 internal capacitor c1 is charged at the constant voltage 6.5v. At the same time, the voltage at pin 1 (ocp / fb) increases with the same waveform as the mosfet drain current. When the pin 1 voltage reaches the thresho...

  • Page 62

    - 61 - service manual wp 895/895f, cp885/885f 5-10 tv start-up, tv normal run and stand by mode operations 5-10-1 tv start-up operations * schematic diagram for start-up operations * tv start-up and microcontroller initialisation - when sw801 power switch is pushed, main ac voltage is applied to t80...

  • Page 63

    - 62 - service manual wp 895 /895f, cp885/885f . If the tv set was on normal run mode before switching off, the microcontroller delivers horizontal drive voltage at pin 24 and picture appears on screen. . If the tv set was on stand-by mode before switching off, the microcontroller switches tv set to...

  • Page 64

    - 63 - service manual wp 895/895f, cp885/885f on normal run mode, i501 microcontroller pin 1 (power) is set to high • so, i810 controlled rectifier is not conducting - q809 is conducting. So, q808 is not conducting and q807 is conducting - so, q807 collector is connected to the ground and i810 contr...

  • Page 65

    - 64 - service manual wp 895/895f, cp885/885f * power supply functioning during tv set normal run mode - i801 transmits controlled pulses to t801 which generates dc voltages after rectifications by secondary part diodes and electro capacitors (by example by d820 and c813 on 143v supply voltage line)...

  • Page 66

    - 65 - service manual wp 895/895f, cp885/885f 2 4 3 d r a i n i801 mofse t a n d control ic 1 main ac voltage i804 opto coupler i823 3.3v r e g u l a t o r i703 ir r e c e i v e r f r o n t m a sk b u t t o n s i810 c o n t r o l l e d r e c t i f i e r sw i t c h i n g c i r c u i t t801 sm ps tra ...

  • Page 67

    - 66 - service manual wp 895/895f, cp885/885f i810 c o n t r o l l e d rectifier r820 r830 c830 r829 q808 6 v d c q809 q807 h i g h h i g h h i g h l o w p o w e r l o w fig : i810 controlled rectifier switching circuit * tv set stand-by mode operations - on stand-by mode, i501 microcontroller pin 1...

  • Page 68

    Service manual wp-895/895f, cp885/885f - 67 - 6. Service parts list (dwx - 28w5 ) caution “ ” parts recommended for stock. “ ® ” safety critical componen, replace only with genuine deawoo safety parts. Loc part code part name decscription remark loc part code part name description remark m211 485215...

  • Page 69

    - 68 - service manual wp-895/895f, cp885/885f loc part code part name decscription remark loc part code part name description remark g900 4sg0d00103 spark gap s-23 900v-1.5kv i101 1tda4470m- ic if tda4470-m i301 1tda8358j- ic vertical tda8358j ® i301a 4857028227 heat sink al ex anodizing i301b 71743...

  • Page 70

    Service manual wp-895/895f, cp885/885f - 69 - loc part code part name decscription remark loc part code part name description remark c156 cbxf1h104z c cera semi 50v f 0.1mf z (tapping) c157 cexf1h100v c electro 50v rss 10mf (5x11) tp c158 cbxf1h104z c cera semi 50v f 0.1mf z (tapping) c164 cexf1e470...

  • Page 71

    - 70 - service manual wp-895/895f, cp885/885f loc part code part name decscription remark loc part code part name description remark q334 t2sc5343y- tr 2sc5343y q402 t2sd1207t- tr 2sd1207-t (tapping) q510 t2sc5343y- tr 2sc5343y q511 t2sc5343y- tr 2sc5343y q542 t2sa1980y- tr 2sa1980y q543 t2sa1980y- ...

  • Page 72

    Service manual wp-895/895f, cp885/885f - 71 - loc part code part name decscription remark loc part code part name description remark ca20 cczb1h222k c cera 50v b 2200pf k (axial) ca3 cczb1h101k c cera 50v b 100pf k (axial) ca4 cczb1h102k c cera 50v b 1000pf k (axial) ca7 cczb1h471k c cera 50v b 470p...

  • Page 73

    - 72 - service manual wp-895/895f, cp885/885f loc part code part name decscription remark loc part code part name description remark j072 85801065gy wire copper awg22 1/0.65 tin coating j073 85801065gy wire copper awg22 1/0.65 tin coating j075 85801065gy wire copper awg22 1/0.65 tin coating j076 858...

  • Page 74

    Service manual wp-895/895f, cp885/885f - 73 - loc part code part name decscription remark loc part code part name description remark r162 rd-az153j- r carbon film 1/6 15k ohm j r163 rd-az752j- r carbon film 1/6 7.5k ohm j r164 rd-az752j- r carbon film 1/6 7.5k ohm j r177 rd-az562j- r carbon film 1/6...

  • Page 75

    - 74 - service manual wp-895/895f, cp885/885f loc part code part name decscription remark loc part code part name description remark r621 rd-az102j- r carbon film 1/6 1k ohm j r622 rd-az102j- r carbon film 1/6 1k ohm j r641 rd-az102j- r carbon film 1/6 1k ohm j r642 rd-az102j- r carbon film 1/6 1k o...

  • Page 76

    Service manual wp-895/895f, cp885/885f - 75 - 7. Exploded view 7-1 dwx-28w5.

  • Page 77

    Service manual wp-895/895f, cp885/885f - 76 - 7. Exploded view 7-2 d wf-28w8.

  • Page 78

    Service manual wp-895/895f, cp885/885f - 77 - 7. Exploded view 7-3 dtf-29u8.

  • Page 79

    Service manual wp-895/895f, cp885/885f - 78 - 7. Exploded view 7-4 dtp-28a7.

  • Page 80

    Service man ual wp-895/895f, cp885/885f - 7 9 - 7. Exploded view 7-5 dtp-28b1.

  • Page 81

    Service man ual wp-895/895f, cp885/885f - 80 - 7. Exploded view 7-6 dtp-28g7.

  • Page 82

    Service manual wp-895/895f, cp885/885f - 81 - 7. Exploded view 7-7 dtp-28g8.

  • Page 83: Printed Circuit Board

    Printed circuit board pcb main.

  • Page 86

    686, ahyeon-dong mapo-gu seoul, korea c.P.O. Box 8003 seoul, korea telex : dwelec k28177-8 cable : “daewooelec” e-mail :djkoo@web.Dwe.Co.Kr.