Daewoo DTA-20 T1, Service Manual

Page 1: ...Cm STEREO ColorTelevision MODEL CHASSIS DTA 20 T1 T2 T3 T8 DTA 21 T1 T2 T5 T9 Y1 DTE 25 G6 G7 DTE 28 G2 G6 G7 96 98 A6 A7 G8 B1 CP 385 CP 385 CP 785 CP 785 S M No CP385P 010 http svc dwe co kr DEC 199...

Page 2: ...ocessor 21 4 3 TDA894xJ Stereo Audio Amplifier 25 4 4 TDA835xJ Vertical Amplifier 26 4 4 1 TDA8357J 26 4 4 1 TDA8358J 28 4 5 TDA6107Q 29 4 6 24C08 8 Kbit EEPROM 30 4 7 STR F6653 31 5 Circuit descripti...

Page 3: ...28 66cm 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 SVHS In Audi...

Page 4: ...th 19 Video Output 1 Vpp 3dB Impedance 75W 20 Video Input 1 Vpp 3dB Impedance 75W 21 Common Earth 21 Pin EURO SCART 2 Pin Signal Description Matching value 1 N C 2 Audio Input Right 0 5 Vrms Impedance...

Page 5: ...5 90 25 57 75 C16 97 25 65 75 C17 183 75 77 75 C18 192 25 85 75 C19 201 25 C20 C21 471 25 471 25 471 25 471 25 C22 479 25 479 25 479 25 479 25 C23 487 25 487 25 487 25 487 25 C24 495 25 495 25 495 25...

Page 6: ...59 25 C58 767 25 767 25 767 25 767 25 C59 775 25 775 25 775 25 775 25 C60 783 25 783 25 783 25 783 25 C61 791 25 791 25 791 25 791 25 C62 799 25 799 25 799 25 799 25 C63 807 25 807 25 807 25 807 25 C6...

Page 7: ...11 25 311 25 311 25 S23 319 25 319 25 319 25 319 25 S24 327 25 327 25 327 25 327 25 S25 335 25 335 25 335 25 335 25 S26 343 25 343 25 343 25 343 25 S27 351 25 351 25 351 25 351 25 S28 359 25 359 25 35...

Page 8: ...oup I Group III It contains all the programs with a weak signal strength which are not listed in group I Group IV If two or more programs with the same code are found only the strongest or if they hav...

Page 9: ...GB Note for satellite receiver users Before starting ATSS turn On your satellite receiver and tune SKY NEWS If GB is selected the TV controlling software seeks for programs only in UHF C21 to C70 The...

Page 10: ...orking on high voltage equipment 2 Discharge the high potential of the picture tube before handling the tube The picture tube is highly evacuated and if broken glass fragments will be violently expell...

Page 11: ...n Option Tuner maker Remark 0 DAEWOO SAMSUNG 1 DAEWOO SAMSUNG 2 SIEL 3 PHILIPS Option 3 is available from software version 3 only 3 3 TV set Alignment 3 3 1 G2 alignement TV in AV mode without video s...

Page 12: ...vertical distortion 3 3 5 Horizontal picture centering Adjust H Shift to have the picture in the center of the screen 3 3 6 East West correction Chassis CP785 only Adjust the H Parall H Bow H Width EW...

Page 13: ...vice manual CP 385 CP785 12 EW Trapez 3 3 7 AGC Adjust the antenna signal level at 68 dB V 2 UHF CH25 Set RF AGC to 0 Increase RF AGC level and stop when the level on pin 6 of TDA936x goes below 2 5 V...

Page 14: ...an be chosen independently l Linear RGB or YUV input with fast blanking for external RGB YUV sources The Text OSD signals are internally supplied from the Controller Teletext decoder l Contrast reduct...

Page 15: ...sing CLUT with 4096 colour palette l Globally selectable scan lines per row 9 10 13 16 and character matrix 12x10 12xl3 12x16 VxH l Fringing Shadow selectable from N S E W direction l Fringe colour se...

Page 16: ...al time capture and decoding for WST Teletext in Hardware to enable optimised microprocessor throughput 10 pages stored On Chip lnventory of transmitted Teletext pages stored in the Transmitted Page T...

Page 17: ...Service manual CP 385 CP785 16...

Page 18: ...re version English French German Italian Spanish Dutch Danish Finnish Norwegian Swedish GB France Germany Belgium Spain Italy Switzerland Austria Denmark Finland Netherlands Norway Sweden Ireland Othe...

Page 19: ...core and peripheral LED 1 10 port 0 5 8mA current sinking capability LED 2 11 port 0 6 8mA current sinking capability VSSA 12 analog ground of teletext decoder and digital ground of TV processor SEC P...

Page 20: ...put G2IN 47 2nd G input B2IN 48 2nd B input BCLIN 49 beam current limiter input BLKIN 50 black current input R0 51 RED Output G0 52 GREEN Output B0 53 BLUE Output VDDA 54 analog supply of Teletext dec...

Page 21: ...Service manual CP 385 CP785 20...

Page 22: ...ed to simultaneously perform digital demodulation and decoding of NICAM coded TV stereo sound as well as demodulation of FM or AM mono TV sound Alternatively two carrier FM systems according to the Ge...

Page 23: ...tally The systems allow two high quality digital sound channels to be added to the already existing FM AM channel The sound coding follows the format of the so called Near Instantaneous Companding Sys...

Page 24: ...FM Mono NICAM PAL UK D K 6 5 6 2578125 D K1 6 5 6 7421875 D K2 6 5 5 85 D K NICAM FM Stereo FM Mono NICAM SECAM East USSR Hungary Architecture of MSP3415D Pin connections and short description Pin No...

Page 25: ...ed 31 TP Out Test pin 32 NC Not Connected 33 NC Not Connected 34 NC Not Connected 35 VREF1 Reference ground 1 high voltage part 36 SC1_OUT_R Out Scart output 1 right 37 SC1_OUT_L Out Scart output 1 le...

Page 26: ...with an all NPN output stage and standby mute logic The TDA8944J comes in a 17 pin DIL power package Features Few external components Fixed gain Standby and mute mode No on off switching plops low st...

Page 27: ...ass G system Due to the full bridge output circuit the deflection coils can be DC coupled The IC is constructed in a Low Voltage DMOS process that combines Bipolar CMOS and DMOS devices MOS transistor...

Page 28: ...l Description 1 Vi pos input voltage positive 2 Vi neg input voltage negative 3 Vp supply voltage 4 VOB output voltage B 5 GND ground 6 Vflb flyback supply voltage 7 VOA output voltage A 8 VO guard gu...

Page 29: ...k 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 vertical flyback switch Gua...

Page 30: ...Typical bandwidth of 5 5 MHz for an output signal of 60 Vpp High slew rate of 900V ms No external components required Very simple application Single supply voltage of 200V Internal reference voltage o...

Page 31: ...ut 6 SCL Serial clock 7 WC Write control 8 Vcc Supply voltage 4 Vss Ground The memory device is compatible with the I2C memory standard This is a two wire serial interface that uses a bi directionnal...

Page 32: ...T and control IC designed for flyback converter type switch mode power supply applications 4 7 2 Features Small SIP fully isolated molded 5 pins package Many protection functions Pulse by pulse overcu...

Page 33: ...TOFF max 45 55 sec Minimum time for input of quaxi resonant signals 1 5 TTH 2 1 0 sec Minimum off time TOFF min 1 5 sec O C P F B terminal threshold voltage 1 1 5 VTH 1 0 68 0 73 0 78 V O C P F B ter...

Page 34: ...Service manual CP 385 CP785 33 5 Circuit description 5 1 Block diagram...

Page 35: ...performance hi fi stereo sound processing can be achieved Video switches The video switch has one input for an external CVBS or Y C signal The selected CVBS signal can be supplied to pin 38 the IF vi...

Page 36: ...rence crystals but has an internal clock generator which is stabilised to the required frequency by using the 12 MHz clock signal from the reference oscillator of the Controller Teletext decoder The A...

Page 37: ...nals and nominal settings of the various controls To obtain an accurate biasing of the picture tube the Continuous Cathode Calibration system has been included in these ICs A black level off set can b...

Page 38: ...ion TV IF audio filter with two channels Channel 1 L with one pass band for sound carrier at 40 40 MHz Channel 2 L D K I B G with one pass band for sound carriers between 32 40 MHz and 33 40 MHz For S...

Page 39: ...Service manual CP 385 CP785 38 Chassis block diagram IF...

Page 40: ...g is done in the MSP3415D I601 by the Controller via I2C bus Fast R G B insertion The external R G B insertion needs a fast switching and cannot be controlled by the software instruction cycle of 1 se...

Page 41: ...Open Drain 11 Green LED Open Drain High impedance 62 Audio mute Push Pull Push Pull High in stand by mode 5 5 Sound processing Analogue sound IF input section The input pins ANA_IN1 and ANA_IN offer...

Page 42: ...nding on the transmitted mode In case of 2 Carrier FM transmission the controlling software read the transmission mode and the signal quality level from the Stereo Detection Register When the set is i...

Page 43: ...Service manual CP 385 CP785 42 Sound signal flow diagram...

Page 44: ...ted at VMODE 0 5 V 5 7 Vertical deflection The vertical driver circuit is a bridge configuration The deflection coil is connected between the output amplifiers which are driven in phase opposition The...

Page 45: ...on coil EAST WEST Amplifier TDA8358J only The East West amplifier is current driven It can only sink currents of the diode modulator circuit A feedback resistor R397 is connected between the input and...

Page 46: ...Power supply primary part operations An oscillator generates pulses signals which turn on and off a MOSFET transistor Start up circuit VIN The start up circuit is used to start and stop the operation...

Page 47: ...tely after the control circuit starts operating VIN starts dropping However as this winding voltage reaches the set value before VIN voltage drops to the shutdown voltage at 11V the control circuit co...

Page 48: ...Comp 1 C1 R1 STR F6653 1 35mA V th 1 V th 2 Oscillating operation O N O N O N O F F O F F O F F M O S F E T s w i t c h i n g O N O F F V D S M O S F E T d r a i n s o u r c e v o l t a g e I D M O S...

Page 49: ...etermined by C1 and R1 is the OFF time of the MOSFET When C1 voltage falls to around 3 7V the STR F6653 internal oscillator is reversed again and the MOSFET turns ON C1 is quickly charged to around 6...

Page 50: ...voltage is applied to T801 transformer after rectification by D801 D804 diodes Then T801 SMPS transformer starts operating and supplies DC voltage to I823 3 3V regulator This regulator provides 3 3V D...

Page 51: ...de before switching off the microcontroller switches TV set to stand by mode decreasing power pin voltage pin 63 This matter will be explained on paragraph 5 9 2 b Reset pulse circuit 3 3V 3 0V 3 0V 1...

Page 52: ...he DC supply voltage decreases below 3 V Q510 switches off immediately Q511 starts conducting pulling I501 pin 60 high At the same time it discharges the reset capacitor C501 Discharging this capacito...

Page 53: ...re the power supply circuit diagram is the one shown on the next paragraph power supply circuit diagram during TV set normal run I 8 2 0 5 V R E G U L A T O R I 8 2 3 3 3 V R E G U L A T O R 1 4 5 V C...

Page 54: ...supply voltage line includes an IC error amplifier I806 which corrects unexpected DC voltage variations on this line power supply IC delivery during TV set normal run power supply line IC power suppl...

Page 55: ...G CIRCUIT T801 SM PS TRANS I501 MAIN IC OCP FB D801 D804 GRAETZ BRIDGE 16 D821 I810 controlled rectifier HIGH C841 C840 R713 1 3 1 2 61 64 56 54 7 63 CONDUCTING IR IN com supply voltage KEY IN POWER R...

Page 56: ...tifier gate pin is set to high and I810 is conducting So current flows from pin 16 SMPS transformer to the ground via I804 optocoupler and Q810 and Q811 transistors which are conducting In these condi...

Page 57: ...220MF 10X16 TP C108 CCZB1H101K C CERA 50V B 100PF K AXIAL C110 CCZB1H102K C CERA 50V B 1000PF K AXIAL C120 CCXB1H102K C CERA 50V B 1000PF K TAPPING C121 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP C305...

Page 58: ...9V C ELECTRO 50V RSS 4 7MF 5 11 TP LOC PART CODE PART NAME DESCRIPTION REMARK C626 CEXF1H479V C ELECTRO 50V RSS 4 7MF 5 11 TP C629 CBXF1H104Z C CERA SEMI 50V F 0 1MF Z TAPPING C630 CEXF1E470V C ELECTR...

Page 59: ...A10 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA11 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA13 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA14 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA15 DTZX5V6B DIODE ZENER TZX5V6B...

Page 60: ...R STC1740 Y R101 RD AZ473J R CARBON FILM 1 6 47K OHM J R102 RD AZ472J R CARBON FILM 1 6 4 7K OHM J R103 RD AZ123J R CARBON FILM 1 6 12K OHM J R104 RD AZ104J R CARBON FILM 1 6 100K OHM J R105 RD AZ392J...

Page 61: ...101J R CARBON FILM 1 6 100 OHM J LOC PART CODE PART NAME DESCRIPTION REMARK R620 RD AZ102J R CARBON FILM 1 6 1K OHM J R621 RD AZ101J R CARBON FILM 1 6 100 OHM J R622 RD AZ101J R CARBON FILM 1 6 100 OH...

Page 62: ...TACT SKHV17910A LOC PART CODE PART NAME DESCRIPTION REMARK SW702 5S50101090 SW TACT SKHV17910A SW703 5S50101090 SW TACT SKHV17910A SW704 5S50101090 SW TACT SKHV17910A SW801 5S40101143 SW PUSH PS3 22S...

Page 63: ...TL 28G2F P601A 4850704S30 CONNECTOR YH025 04 35098 ULW 700 SP01 4858311110 SPEAKER 12W 8 OHM SP 58126F SP02 4858311110 SPEAKER 12W 8 OHM SP 58126F ZZ290 PTMPMS0001 PCB MAIN MANUAL AS DTE 28G2F C101 CE...

Page 64: ...C ELECTRO 50V RSS 1MF 5X11 TP LOC PART CODE PART NAME PART DESCRIPTION REMARK C615 CEXF1H109V C ELECTRO 50V RSS 1MF 5X11 TP C616 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP C617 CBXF1H104Z C CERA SEMI...

Page 65: ...E PART NAME PART DESCRIPTION REMARK D830 DBYW36 DIODE BYW36 TAPPING D831 DBYW36 DIODE BYW36 TAPPING D840 D1N4148 DIODE 1N4148 TAPPING D841 D1N4148 DIODE 1N4148 TAPPING D860 DBYW76 DIODE BYW76 D904 DBA...

Page 66: ...TR STC1740 Y LOC PART CODE PART NAME PART DESCRIPTION REMARK Q507 TSTA933Y TR STA933 Y Q508 TSTC1740Y TR STC1740 Y Q509 TSTA933Y TR STA933 Y Q510 TSTA933Y TR STA933 Y Q511 TSTA933Y TR STA933 Y Q807 T...

Page 67: ...J R CARBON FILM 1 6 100 OHM J LOC PART CODE PART NAME PART DESCRIPTION REMARK R591 RD AZ221J R CARBON FILM 1 6 220 OHM J R592 RD AZ103J R CARBON FILM 1 6 10K OHM J R593 RD AZ103J R CARBON FILM 1 6 10K...

Page 68: ...ILM 1 6 68 OHM J RA16 RD AZ680J R CARBON FILM 1 6 68 OHM J RA19 RD AZ750J R CARBON FILM 1 6 75 OHM J LOC PART CODE PART NAME PART DESCRIPTION REMARK RA20 RD AZ473J R CARBON FILM 1 6 47K OHM J RA21 RD...

Page 69: ...274J CMYH3C822J CMYT2D304J CMYT2D304J CMYH3C822J 4 C408 C MALAR 250V 0 27MF MKP 250V 0 36MF MKP 250V 0 27MF MKP 250V 0 36MF MKP 250V 0 36MF MKP CMYT2D274J CMYT2D364J CMYT2D274J CMYT2D364J CMYT2D364J 5...

Page 70: ...69 Service Manual cp 385 cp 785 7 Exploded View 7 1 DTA 20T1...

Page 71: ...16000 4852061001 4854848501 PART CORD 7128301211 10 4 No 1 3 2 7 5 6 9 8 14 15 16 11 12 13 20 18 17 19 L 70MM 2 SCREW CRT FIXING AS WASHER RUBBER DECO SENSOR MARK BRAND PART NAME MASK FRONT BUTTON POW...

Page 72: ...BK PMMA CL ABS BK T2S W AS 3X10 MFZN T2S W AS 3X10 MFZN MAIN PCB A SSY NO PART CODE PART NAME Q ty MATERIAL REMARKS 11 12 13 14 15 16 17 18 19 20 4852147100 4857821 101 712240141 1 4855415800 4856013...

Page 73: ...72 7 4 DTA 20T8 Service Manual cp 385 cp 785...

Page 74: ...73 7 5 DTA 21T1 Service Manual cp 385 cp 785...

Page 75: ...X12 MFZN CR T1 0 L 70mm 11 12 13 14 15 16 17 18 19 20 4856013300 4856013302 4853530901 4857025401 717430081 1 4857024617 717430101 1 CRT SCREW CR T FIXING AS HOLDER LED HEA T SINK SEREW TAPPING SCREW...

Page 76: ...75 7 7 DTA 21T5 Service Manual cp 385 cp 785...

Page 77: ...76 7 8 DTA 21T9 Service Manual cp 385 cp 785...

Page 78: ...BUTTON BUTTON CTRL AS MARK BRAND SPRING BUTTON POWER MASK FRONT 4852156101 4855415800 4856013303 4856214902 15 14 13 12 11 10 9 COVER BACK SPEC PLATE MAIN PCB WASHER RUBBER CRT L 70MM 2 485009FC DEVE...

Page 79: ...78 Service Manual cp 385 cp 785 7 10 DTE 25G6...

Page 80: ...79 Service Manual cp 385 cp 785 7 11 DTE 25G7...

Page 81: ...ELT T0 7 200X20 BUTTON POWER SPRING DOOR DECO CTRL MARK BRAND DOOR LOCK SPK SCREW TAPPING MASK FRONT RETAINER BLACK CLOTH BLACK BUTTON NAIN PCB AS WASHER RUBBER SCREW CRT FIXING CRT CLOTH BLACK COVER...

Page 82: ...81 7 13 DTE 28G6 Service Manual cp 385 cp 785...

Page 83: ...S PART CODE 1 BUTTON CTRL 1 1 1 1 1 1 DOOR MARK BRAND DECO_CRTL SPRING MASK FRONT QTY Inspected by PART NAME K C OH S H KIM Approved by MODEL N M JONG Checked by BUTTON_POWER Center REFERENCE 48578176...

Page 84: ...83 7 15 DTE 2896 Service Manual cp 385 cp 785 1 3 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29...

Page 85: ...84 7 16 DTE 2898 Service Manual cp 385 cp 785 1 3 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29...

Page 86: ...4853535600 CLAMP CORD 1 PE 7 4854856801 BUTTON POWER 1 HIPS BK 8 4855059501 DECO CTRL 1 PVC 9 4856015820 SCREW_CRT_FIX 4 SWRM SK 5 YL 10 4856215402 WASHER RUBBER 4 CR 11 4856716000 SPRING 1 SWPA 12 48...

Page 87: ...A1050P H24 8 4856015820 SCREW_CRT_FIX SWRM SK 5 L 35 9 4856215402 WASHER RUBBER CR T2 0 10 4856716000 SPRING SWPA 11 4857923300 DOOR LOCK POM N6 N66 G30 12 7122401212 SCREW TAPPING SWRM BK 13 7122401...

Page 88: ...7 8 9 10 11 13 14 15 16 19 20 21 CLOTH BLACK 4857818702 FELT T0 7 L 250 W 15 2 7122401212 8 PCB A ssy cp 776 1 A66EAK071X11 CRT A ssy 1 GLASS 4857817610 CLOTH BLACK 3 FELT 300X20X0 7 HIPS BK 48556161...

Page 89: ...10 SPEC PLATE 4855415800 1 CLAMP CORD 97P4602700 1 3 4 5 6 7 8 9 10 11 T2S WAS 3X10 MFZN ABS GY CR T2 0 SWRM SK5 L 35 PHILIPS 28 PS ABS GY SWPA PIE 0 5 AL SILVER P P BK CP 785 PFC5000 0702 AL EX TT2...

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Page 92: ...ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC E mail G7F00E web dwe co kr FAX 032 510 7630 TEL 032 510 7624 PRINTED DATE DEC...