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DAEWOO ELECTRONICS DTE-21U6TH Service Manual

51 cm stereo colortelevision
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Service Manual

51 Cm STEREO Color Television
MODEL
DTE-21U6TH
PF51T30
 Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
S/M No. : TCP785AFF0
CHASSIS
CP-785AF
CP-785AF
Apr. 2002

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Summary of Contents for DAEWOO ELECTRONICS DTE-21U6TH

  • Page 1: Service Manual

    : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr Apr. 2002...
  • Page 2 5-8 Power supply (STR-F6654) ....................39 5-9 TV start-up, TV normal run and stand by mode operations ..........43 6 -Service parts list..........................50 PF15T30 ..........................50 (DTE-21U6TH) 7 - Exploded view ..........................59 8 - PCB Layout ............................ 9 - Circuit Diagram..........................

  • Page 3: Specifications

    Service manual CP-785AF 1-1 Specifications PAL, SECAM - B/G, H TV standard Sound system NICAM B/G FM 2Carrier B/G Power consumption 21" : 95W approx. 21" : 3W x 3W (at 60% mod, 10%THD) Sound Output Power 21" : 5W 8 ohm x 2 Speaker 10 pages memory FASTEXT (FLOF or TOP) Teletext system...
  • Page 4 Service manual CP-785AF Rear RCA Jack - output Signal Description Matching value TV Video 1.0Vpp +/- 3dB , Impedence 75 ohm TV Audio Left 0.5Vrms at RF sound FM 54% Mod.(27kHz dev.) TV Audio Right 0.5Vrms at RF sound FM 54% Mod.(27kHz dev.) Rear SCART [or RCA Jack - Input1 and S-VHS (optional)] - SCART : 21 pin Euro SCART ->...

  • Page 5: Channel Table

    Service manual CP-785AF 1-2 Channel table FREQUENCY TABLE CP-785AF AUSTRALIA N/Z'land 46.25 57.25 64.25 86.25 95.25 102.25 138.25 175.25 182.25 189.25 196.25 209.25 216.75 45.25 55.25 62.25 203.25 210.25 217.25 471.25 479.25 487.25 495.25 503.25 511.25 519.25 527.25 534.25 541.25 548.25 555.25 562.25...
  • Page 6 Service manual CP-785AF AUSTRALIA N/Z'land 624.25 631.25 638.25 645.25 652.25 659.25 666.25 673.25 680.25 687.25 694.25 701.25 708.25 715.25 722.25 729.25 736.25 743.25 750.25 757.25 764.25 771.25 779.25 786.25 793.25 800.25 807.25 814.25 105.25 112.25 119.25 126.25 133.25 140.25 147.25 154.25 161.25 - 5 -...
  • Page 7 Service manual CP-785AF AUSTRALIA N/Z'land 168.25 231.25 238.25 245.25 252.25 259.25 266.25 273.25 280.25 287.25 294.25 303.25 311.25 319.25 327.25 335.25 343.25 351.25 359.25 367.25 375.25 383.25 391.25 399.25 407.25 415.25 423.25 431.25 439.25 447.25 455.25 463.25 - 6 -...

  • Page 8: Safety Instruction

    Service manual CP-785AF 2 - Safety instruction WARNING: Only competent service personnel may carry out work involving the testing or repair of this equipment. X-RAY RADIATION PRECAUTION Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 26~28 KV (25”...

  • Page 9: Alignment Instructions

    Service manual CP-785AF 3 - Alignment instructions 3-1 Microcontroller configuration : Service mode To switch the TV set into service mode please see instruction below. 1 - Select pr. number 91 2 - Adjust sharpness to minimum value and exit all menu. 3 - Quickly press the key sequence : RED - GREEN - menu To exit SERVICE menu press menu key or Operate(Std By) key.

  • Page 10: Tv Set Alignment

    Service manual CP-785AF 3-3 TV set Alignment 3-3-1. Service Remote controller for Alignment : R-30SVC7 (S/N:48B380SV7) 3-3-2. G2 alignement - There are 2 kinds of screen voltage adjustment - Method 1 (Use the SVC Remote Controller) ; TV in RF mode without any signal (noise signal) ;...
  • Page 11 Service manual CP-785AF 3-3-7. East / West correction - Adjust the H Parall, H Bow, H Width, EW Parabo, Up Corner, Dw Corner, EW trapez to compensate for geometrical distortion. H. Parall EW.Parabo l a H. Bow Up Corner H.Width Dw Corner EW Trapez 3-3-8.

  • Page 12: Ic Description

    Service manual CP-785AF 4 - IC description 4-1 TDA936x TV signal processor - Teletext decoder with embedded µ-Controller. TV-signal Processor l Multi-standard vision IF circuit with alignment-free PLL demodulator l Internal (switchable) time-constant for the IF-AGC circuit l Source selection between 'Internal' CVBS and external CVBS or Y/C signals l Integrated chrominance trap circuit l Integrated luminance delay line with adjustable delay time l Asymmetrical ‘...
  • Page 13 Service manual CP-785AF l Inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page Table (SPT) l Data Capture for US Closed Caption l Data Capture for 525/625 line WST, VPS (PDC system A) and Wide Screen Signalling (WSS) bit decoding Automatic selection between 525 WST/625 WST l Automatic selection between 625 WST/VPS on line 16 of VBI l Real-time capture and decoding for WST Teletext in Hardware, to enable optimised µ-processor...
  • Page 14 Service manual CP-785AF - Data Capture for 625 line WST - Data Capture for 525 line WST - Data Capture for US Closed Caption - Data Capture for VPS data (PDC system A) - Data Capture for Wide Screen Signalling (WSS) bit decoding - Automatic selection between 525 WST/625WST - Automatic selection between 625WST/VPS on line 16 of VBI - Real-time capture and decoding for WST Teletext in Hardware, to enable optimised microprocessor...
  • Page 15 Service manual CP-785AF - 14 -...
  • Page 16 Service manual CP-785AF Chassis IC marking OSD languages Capacity Text CP-785A DW9365/N1/3-BDx English Pan-European, (OTP: TDA9365PS/ 10 pages Teletext N1/5S PINNING SYMBOL DESCRIPTION n.u. Port 1.3 Not used. I2C bus clock line I2C Data line SECAM L’ out Port 2.0 : High when L’ selected (PushPull ) Port 3.0 : Over Current Protection RF AGC in ADC 1 : For factory use only ( High impedance )
  • Page 17 Service manual CP-785AF SYMBOL DESCRIPTION QSS out QSS intercarrier output EHT0 EHT/Overvoltage protection PLLIF IF PLL loop filter IFVO IF video output main supply voltage TV-processor CVBSINT internal CVBS input GND1 ground 1 for TV-processor CVBS/Y external CVBS/Y input CHROMA chrominance input (SVHS) AMOUT n.u.
  • Page 18 Service manual CP-785AF - 17 -...

  • Page 19: Msp3415D Multistandard Sound Processor

    Service manual CP-785AF 4-2 MSP3415D Multistandard Sound Processor The MSP 3415D is designed as a single-chip Multistandard Sound Processor for applications in analogue and digital TV sets, video recorders, and PC cards. MSP 3415D features - sound IF input - No external filters required - Stereo baseband input via integrated AD converters - Two pairs of DA converters - Two carrier FM or NICAM processing...
  • Page 20 Service manual CP-785AF - two selectable analogue pairs of audio baseband input (= two SCART inputs) input level: <2 V RMS, input impedance: >25 kΩ - one selectable analogue mono input (i.e. AM sound): Not used in this chassis - two high-quality A/D converters, S/N-Ratio: >85 dB - 20 Hz to 20 kHz bandwidth for SCART-to-SCART copy facilities - loudspeaker: one pair of four-fold oversampled D/A converters output level per channel: max.
  • Page 21 Service manual CP-785AF TV standards Position of sound carrier Sound modulation Color system Remark system (MHz) 5.5 / 5.7421875 FM Stereo Applied 5.5 / 5.85 FM-Mono / NICAM Applied 6.5 / 5.85 AM - Mono / NICAM SECAM-L 6.0 / 6.552 FM-Mono / NICAM 6.5 / 6.2578125 D/K1 FM Stereo...
  • Page 22 Service manual CP-785AF Pin No. Pin Name Type Short description In / Out Test pin In / Out Test pin Test pin Not Connected Test pin Test pin Test pin DVSUP Digital power supply +5V DVSS Digital Ground Not Connected Not Connected Not Connected Not Connected...
  • Page 23 Service manual CP-785AF Pin No. Pin Name Type Short description AVSS Analog ground AVSUP Analog power supply ANA_IN1+ IF input 1 ANA_IN1- IF common Not Connected TESTEN Test pin XTAL_IN Crystal oscillator XTAL_OUT Crystal oscillator Test pin 4-3 TDA894xJ family Stereo Audio Amplifier The TDA8946J is a dual-channel audio power amplifier with an output power of 2 x 7W at an 8 ohm load and a 12 V supply.

  • Page 24: Tda835Xj Vertical Amplifier

    Service manual CP-785AF Block diagram TDA894xJ 4-4 TDA835xJ Vertical Amplifier The TDA835xJ are power circuit for use in 90° and 110° 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 as a highly efficient class G system.

  • Page 25: Tda8358J

    Service manual CP-785AF 4-4-1 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 vertical flyback switch - Guard circuit - Temperature (thermal) protection - High EMC because of common mode inputs...

  • Page 26: Tda6107Q

    Service manual CP-785AF 4-5 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 performance, the amplifier should be used with black-current control.

  • Page 27: C08 8 Kbit Eeprom

    Service manual CP-785AF Block diagram TDA6107Q 4-6 24C08 8 Kbit EEPROM features : - 8 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.

  • Page 28: Str-F665X

    Service manual CP-785AF 4-7 STR - F665X 4-7-1 General description The STR-F665X is an hybrid IC with a build-in MOSFET 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 overcurrent protection (OCP) * Overvoltage protection with latch mode (OVP)
  • Page 29 Service manual CP-785AF 4-7-4 Pins description name symbol description Overcurrent / feedback O.C.P./ F.B. Input of overcurrent detection signal and feedback signal Source MOSFET source Drain MOSFET drain Supply Input of power supply for control circuit Ground Ground 4-7-5 Control part electrical characteristics description IC pins symbol...

  • Page 30: Circuit Description

    Service manual CP-785AF 5 - Circuit description 5-1 Block diagram - 29 -...
  • Page 31 Service manual CP-785AF FUNCTIONAL DESCRIPTION OF VIDEO PROCESSOR Vision IF amplifier The vision IF amplifier can demodulate signals with positive and negative modulation. The PLL demodulator is completely alignment-free. The VCO of the PLL circuit is internal and the frequency is fixed to the required value by using the clock frequency of the µ-Controller/Teletext decoder as a reference.
  • Page 32 Service manual CP-785AF In the TDA936x series, the following geometry parameters can be adjusted for all picture tubes : • Horizontal shift • Vertical amplitude • Vertical slope • S-correction • Vertical shift The types which are intended to be used in combination with 110° picture tubes have an East-West control circuit.
  • Page 33 Service manual CP-785AF the desired free-running frequency and the bandgap reference to obtain the correct absolute value of the output signal. The VCO of the PLL is calibrated during each vertical blanking period, when the IC is in search or SECAM mode. The base-band delay line (TDA 4665 function) is integrated.
  • Page 34 Service manual CP-785AF 5-2 IF The TDA936x has an alignment free IF PLL demodulator. The fully integrated oscillator is automatically calibrated, using the 12 Mhz crystal as a frequency reference. The IF frequency is simply set in TV-Processor by I2C bus. The AFC information is available via I2C bus from the TV-Processor status bytes.

  • Page 35: Source Switching

    Service manual CP-785AF 5-3 Source switching The TDA936x has only one external video input, the external video switching circuit made with Q504, Q505 and Q508 allows 2 external video signal inputs. The switching command can be the µ-Controller pin 8 when the software takes control of the video source. The µ-Controller pin 8 is automatically configured by the controlling software (See table below).

  • Page 36: Sound Processing

    Service manual CP-785AF High impedance This mode can be used for input only operation of the port. Special port for LED Pin 10 and 11 have the same functionality as the general I/O pins but in addition, their current source and sink capacity is 8 mA instead of 4 mA.
  • Page 37 Service manual CP-785AF 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. DSP section All audio baseband functions are performed by digital signal processing (DSP). The DSP section controls the source and output selection, and the signals processing.

  • Page 38: Sound Amplification

    Service manual CP-785AF 5-6 Sound amplification The TDA8946J is a stereo BTL audio amplifier capable of delivering 2 x 7 W output power to an 8 Ω load at THD = 10%, using a 12 V power supply and an external heatsink. The voltage gain is fixed at 32dB.
  • Page 39 Service manual CP-785AF For HF loop stability a damping resistor (R305) is connected across the deflection 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 output of this inverting amplifier in order to convert the East-West correction input into an output voltage.

  • Page 40: Power Supply (Str-F6654)

    Service manual CP-785AF 5-8 Power supply (STR-F6654) 5-8 -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. 5-8 -2 Power supply primary part operations An oscillator generates pulses signals which turn on and off a MOSFET transistor.
  • Page 41 Service manual CP-785AF When the power switch is pushed on, V increases slowly. During this time, C806 is charged through R802. As soon as V reaches 16V, the STR-F6654 control circuit starts operating. Then, V is obtained by smoothing the winding voltage which appears between pin6 and pin7 of the SMPS transformer. As this winding voltage does not increase to the set voltage immediately after the control circuit starts operating, V starts dropping.
  • Page 42 Service manual CP-785AF * STR-F665X oscillating operation TO PIN4 SM PS STR-F6653 D R A I N D R I V E Comp.1 V th(1) SOURCE R808 1.35mA From PIN 6 OCP/FB SM PS ( F E E D B A C K ) V th(2) R804 C850...
  • Page 43 Service manual CP-785AF ¬ 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.

  • Page 44: Tv Start-Up, Tv Normal Run And Stand By Mode Operations

    Service manual CP-785AF 5-9 TV start-up, TV normal run and stand-by mode operations 5-9-1 TV start-up operations * Schematic diagram for start-up operations I823 REG 3.3V O U T G N D RESET PULSE CIRCUIT O U T L511 L512 L510 Vddp Vddc VddA...
  • Page 45 Service manual CP-785AF . If the TV set was on normal run mode before switching off, the microcontroller delivers horizontal drive voltage at pin 33 and picture appears on screen. . If the TV set was on stand-by mode before switching off, the microcontroller switches TV set to stand-by mode, decreasing power pin voltage (pin 63).
  • Page 46 Service manual CP-785AF * Reset pulse circuit operations description - When DC supply voltage from I823 regulator starts rising (from 0V to 1.2V), no current flows through D591 zener diode. So, Q510 is in off mode. Also V =Vcc/2 -Vcc = -Vcc/2 > -0.6V. So, Q511 is in off mode. be Q511 Then, no voltage reaches I501 pin 60.
  • Page 47 Service manual CP-785AF On normal run mode, I501 microcontroller pin 63 (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 controlled rectifier gate pin is set to low (no conducting) •...
  • Page 48 Service manual CP-785AF * 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 49 Service manual CP-785AF I810 CONDUCTING controlled rectifier I823 3.3V R E G U L A T O R D821 C840 HIGH C841 AROUND AROUND 3.3Vdc 6V dc D825 T801 SM PS TRA N S R810 R713 I810 C O N T R O L L E D RECTIFIER I703 IR SW I T C H I N G...
  • Page 50 Service manual CP-785AF I810 CONTROLLED RECTIFIER 6V DC HIGH R829 R830 R820 C830 HIGH Q807 Q808 HIGH POWER Q809 I810 controlled rectifier switching circuit * TV set stand-by mode operations -On stand-by mode, I501 microcontroller pin 63 (power) is set to low. - So, Q809 collector is set to high.

  • Page 51: Dte-21U6Th

    Electrical Parts List part_cd part_nm part_desc remark ZZ100 48B4744N08 TRANSMITTER REMOCON R-44N08 (AA) ZZ110 PTACPWD454 ACCESSORY AS DTE-21U6TH 00010 4850Q00810 BATTERY R6P/LN ZZ131 48519A7110 CRT GROUND NET 2101F-1015-1P ZZ132 58G0000147 COIL DEGAUSSING DC-21SF V901 48A96521M1 CRT BARE A51QDX992X (N) ZZ200...

  • Page 52: Dte-21U6Th

    X601 5XE18R432E CRYSTAL QUARTZ HC-49/U 18.43200MHZ 30PPM Z501 5PYXT5R5MB FILTER CERA XT 5.5MB ZZ200 PTMPJ0D454 PCB MAIN (RHU) AS DTE-21U6TH C305 CEXF1E471V C ELECTRO 25V RSS 470MF (10X16) TP C315 CEXF2C470C C ELECTRO 160V RUS 47MF (13X25) TP C431 CMXE2D103J C MYLAR 200V PU 0.01MF J (TP)

  • Page 53: Dte-21U6Th

    2W 0.22 OHM J SMALL R920 RS01Z519J- R M-OXIDE FILM 1W 5.1 OHM J (TAPPING) ZZ200 PTMPJRD454 PCB MAIN RADIAL AS DTE-21U6TH C101 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C102 CEXF1H470V C ELECTRO 50V RSS 47MF (6.3X11) TP...
  • Page 54 part_cd part_nm part_desc remark C540 CEXF1H220V C ELECTRO 50V RSS 22MF (5X11) TP C541 CEXF1H220V C ELECTRO 50V RSS 22MF (5X11) TP C542 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C543 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C550 CEXF1H229V C ELECTRO...

  • Page 55: Dte-21U6Th

    SW TACT THVH472GCA SW704 5S50101090 SW TACT THVH472GCA SW705 5S50101090 SW TACT THVH472GCA ZZ200 PTMPJAD454 PCB MAIN AXIAL AS DTE-21U6TH 2TM14006LB TAPE MASKING 3M #232 6.0X2000M 2TM10006LB TAPE MASKING 3M #232-MAP-C 6.2X2000M A001 4859806093 PCB MAIN 330X246 S1B - 54 -...
  • Page 56 part_cd part_nm part_desc remark C515 CBZR1C222M C CERA 16V Y5R 2200PF M (AXIAL) C516 CBZR1C472M C CERA 16V Y5R 4700PF M (AXIAL) C520 CCZB1H102K C CERA 50V B 1000PF K (AXIAL) C521 CCZB1H102K C CERA 50V B 1000PF K (AXIAL) C665 CBZR1C472M C CERA...
  • Page 57 part_cd part_nm part_desc remark L500 5CPZ120K02 COIL PEAKING 12UH K (AXIAL 3.5MM) L501 5CPZ100K02 COIL PEAKING 10UH K (AXIAL 3.5MM) L502 5CPZ100K02 COIL PEAKING 10UH K (AXIAL 3.5MM) L510 5CPZ100K02 COIL PEAKING 10UH K (AXIAL 3.5MM) L511 5CPZ100K02 COIL PEAKING 10UH K (AXIAL 3.5MM) L512 5CPZ100K02...
  • Page 58 part_cd part_nm part_desc remark R515 RD-AZ153J- R CARBON FILM 1/6 15K OHM J R516 RD-AZ393J- R CARBON FILM 1/6 39K OHM J R517 RD-AZ561J- R CARBON FILM 1/6 560 OHM J R518 RD-AZ273J- R CARBON FILM 1/6 27K OHM J R520 RD-AZ333J- R CARBON FILM...
  • Page 59 part_cd part_nm part_desc remark R662 RD-AZ752J- R CARBON FILM 1/6 7.5K OHM J R663 RD-4Z829J- R CARBON FILM 1/4 8.2 OHM J R664 RD-4Z829J- R CARBON FILM 1/4 8.2 OHM J R700 RD-2Z332J- R CARBON FILM 1/2 3.3K OHM J R710 RD-AZ201J- R CARBON FILM...

  • Page 60: Exploded View

    Service manual CP-785AF 7- Exploded view - 59 -...

  • Page 61: Pcb Layout

    Service manual CP-785AF 8- PCB Layout - 60 -...

  • Page 62: Circuit Diagram

    S ervice manual C P -785AF 9- C ircuit Diagram - 61 -...
  • 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”...

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