Daewoo DTE-25G5THS, Service Manual

Page 1: ...S M No TCP785AEF0 http svc dwe co kr NOV 2000 DAEWOO ELECTRONICS CO LTD Caution In this Manual some parts can be changed for improving their performance without notice in the parts list So if you nee...

Page 2: ...18 4 3 TDA894xJ Stereo Audio Amplifier 22 4 4 TDA835xJ Vertical Amplifier 23 4 4 1 TDA8358J 24 4 5 TDA6107Q 25 4 6 24C08 8 Kbit EEPROM 26 4 7 STR F6654 27 5 Circuit description 29 5 1 Block diagram 2...

Page 3: ...ir channels S cable channels and hyperband Tuning system frequency synthesiser tuning system Visual screen size 25 59 cm 29 68 cm Channel indication On Screen Display Program Selection 100 programmes...

Page 4: ...Hz dev W W W W 21 pin Euro SCART Input 1 S Video Pin Signal Description Matching value 1 N C 2 Audio Input Right 0 5 Vrms Impedance 10 kW 3 N C 4 Audio Earth 5 Earth 6 Audio Input Left 0 5 Vrms Impeda...

Page 5: ...C06 175 25 C07 182 25 C08 189 25 C09 196 25 C10 209 25 C11 216 75 N01 45 25 N02 55 25 N03 62 25 N08 203 25 N09 210 25 N10 217 25 C21 471 25 C22 479 25 C23 487 25 C24 495 25 C25 503 25 C26 511 25 C27...

Page 6: ...25 C51 687 25 C52 694 25 C53 701 25 C54 708 25 C55 715 25 C56 722 25 C57 729 25 C58 736 25 C59 743 25 C60 750 25 C61 757 25 C62 764 25 C63 771 25 C64 779 25 C65 786 25 C66 793 25 C67 800 25 C68 807 25...

Page 7: ...25 S15 259 25 S16 266 25 S17 273 25 S18 280 25 S19 287 25 S20 294 25 S21 303 25 S22 311 25 S23 319 25 S24 327 25 S25 335 25 S26 343 25 S27 351 25 S28 359 25 S29 367 25 S30 375 25 S31 383 25 S32 391 25...

Page 8: ...age 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 expelled 2 If any Fuse in...

Page 9: ...ark 0 DAEWOO SAMSUNG for Daewoo Remote control 1 DAEWOO SAMSUNG for Daewoo Remote control 4 DAEWOO SAMSUNG for NEC Remote control 5 DAEWOO SAMSUNG for NEC Remote control 3 3 TV set Alignment 3 3 1 G2...

Page 10: ...e for 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 Adjust the H Parall H Bow H Width EW Parabo Up Co...

Page 11: ...Service manual CP 785A 10 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 Vdc...

Page 12: ...the bright parts of the screen can be chosen independently l The Text OSD signals are internally supplied from the Controller Teletext decoder l Contrast reduction possibility during mixed mode of OS...

Page 13: ...g 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 selec...

Page 14: ...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 Tab...

Page 15: ...Service manual CP 785A 14...

Page 16: ...g 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 PLL 13 SECAM PLL decoupling VP2 14 2nd supply voltage TV...

Page 17: ...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 decode...

Page 18: ...Service manual CP 785A 17...

Page 19: ...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 Germ...

Page 20: ...lly 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 Syste...

Page 21: ...o NICAM PAL N A 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 N A Architecture of MSP3415D Pin connections and short description Pin No Pin Name Type...

Page 22: ...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 left...

Page 23: ...all NPN output stage and standby mute logic The TDA8946J comes in a 17 pin DIL power package Features Few external components Fixed gain Standby and mute mode No on off switching plops low standby cu...

Page 24: ...nd 16 9 picture tubes The circuit provides a DC driven vertical deflection output circuit operating as a highly efficient class G system Due to the full bridge output circuit the deflection coils can...

Page 25: ...urrent 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 Guard...

Page 26: ...pical 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 of...

Page 27: ...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 da...

Page 28: ...nd 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 overcurre...

Page 29: ...OFF 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 termi...

Page 30: ...Service manual CP 785A 29 5 Circuit description 5 1 Block diagram...

Page 31: ...tereo 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 video output The selec...

Page 32: ...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 Automat...

Page 33: ...s 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 be m...

Page 34: ...s tuned using the direct frequency entry or after fine tuning adjustment Therefore it is recommended to tune channel with the TV search function manual or Auto setup or using the direct channel entry...

Page 35: ...g and cannot be controlled by the software instruction cycle of 1 sec The fast switching pin 16 of SCART 1 is directly connected to the TV processor pin 45 Fast blanking input The display is synchroni...

Page 36: ...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 the possibility to connect so...

Page 37: ...ing 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 in...

Page 38: ...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 differentia...

Page 39: ...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 ou...

Page 40: ...wer 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 of...

Page 41: ...ly 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 cont...

Page 42: ...omp 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 F...

Page 43: ...rmined by C1 and R1 is the OFF time of the MOSFET When C1 voltage falls to around 3 7V the STR F6654 internal oscillator is reversed again and the MOSFET turns ON C1 is quickly charged to around 6 5V...

Page 44: ...tage 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 DC v...

Page 45: ...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 2V...

Page 46: ...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 capacitor i...

Page 47: ...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 P...

Page 48: ...tage 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 supply delivery...

Page 49: ...IRCUIT 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 R888...

Page 50: ...fier 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 conditi...

Page 51: ...YLAR 400V PU 0 62MF J 29 CMYE2G434J C MYLAR 400V PU 0 43MF J 25 C412 CEXF2C339C C ELECTRO 160V RUS 3 3MF 8X16 TP C414 CMXM2A104J C MYLAR 100V 0 1MF J TP C415 CEXF2E479V C ELECTRO 250V RSS 4 7MF 10X16...

Page 52: ...1E101V C ELECTRO 25V RSS 100MF 6 3X11 TP C601 CCXB1H472K C CERA 50V B 4700PF K TAPPING C602 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP C603 CCXB1H472K C CERA 50V B 4700PF K TAPPING C604 CEXF1E102V C EL...

Page 53: ...1K C CERA 1KV R 470PF K 125 DE0705 C824 CCXB3A471K C CERA 1KV B 470PF K T C830 CBZF1H104Z C CERA SEMI 50V F 0 1MF Z C831 CCXB3A471K C CERA 1KV B 470PF K T C832 CEXF1E102V C ELECTRO 25V RSS 1000MF 13X2...

Page 54: ...RGP30J D904 D1N4004S DIODE 1N4004S D905 D1N4004S DIODE 1N4004S D906 D1N4004S DIODE 1N4004S D907 D1N4937G DIODE 1N4937G TAPPING D951 D1N4148 DIODE 1N4148 TAPPING D952 D1N4148 DIODE 1N4148 TAPPING D953...

Page 55: ...XIAL 3 5MM L602 5CPZ479K02 COIL PEAKING 4 7UH K AXIAL 3 5MM L603 5CPZ479K02 COIL PEAKING 4 7UH K AXIAL 3 5MM L650 5MC0000100 COIL BEAD HC 3550 L801 5MC0000100 COIL BEAD HC 3550 L802 58C9430599 COIL CH...

Page 56: ...OHM J SMALL R401 RD 4Z272J R CARBON FILM 1 4 2 7K OHM J R402 RD 4Z220J R CARBON FILM 1 4 22 OHM J R404 RD 4Z399J R CARBON FILM 1 4 3 9 OHM J R406 RS02Z821JS R M OXIDE FILM 2W 820 OHM J SMALL R415 RS0...

Page 57: ...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 OHM J R594 RD AZ103J R CARBON FILM 1 6 10K OHM J R595 RD AZ473J R CARBON FILM 1 6 47K OHM J...

Page 58: ...BON FILM 1 6 100 OHM J R913 RC 2Z102K R CARBON COMP 1 2 1K OHM K R914 RC 2Z102K R CARBON COMP 1 2 1K OHM K R915 RC 2Z102K R CARBON COMP 1 2 1K OHM K R920 RS01Z569J R M OXIDE FILM 1W 5 6 OHM J TAPPING...

Page 59: ...30PPM X601 5XE18R432E CRYSTAL QUARTZ HC 49 U 18 43200MHZ 30PPM Z501 5PYXT5R5MB FILTER CERA XT 5 5MB ZZ100 48B4744N08 TRANSMITTER REMOCO R 44N08 AA ZZ120 PTBCSHD393 COVER BACK AS DTE 29G5TH 29 PTBCSHD3...

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Page 63: ...DAEWOO 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 djkoo web dwe co kr PRINTED DATE DEC 1999...