Daewoo DTA-14C4TFF Service Manual
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Daewoo DTA-14C4TFF Service Manual

Chassis : cp-185
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Service Manual

Color Television
CHASSIS : CP-185
Model : DTA-14C4TFF
DTA-20C4TF
DTA-14V1TF
DTA-21C6TFF
14 V1
SPECIFICATIONS
Version
TV standard
PAL B/G
Sound system
mono
Power consumption
14";39W;
Sound Output Power
2.5W (at 60% mod, 10% THD)
Speaker
3W 8 ohm
10 pages memory FASTEXT (FLOF or TOP)
Teletext system
Aerial input
75 ohm unbalanced
off-air cannels, S-cable channels and hyperband
Channel coverage
Tuning system
frequency synthesiser tuning system
14": 34 cm
Visual screen size
20": 48 cm
21": 51 cm
Channel indication
On Screen Display
Program Selection
100 programmes
EURO-SCART : Audio / Video in and Out,
Aux. terminal
R/G/B in, Slow and Fast swtching, SVHS in.
Audio-Video jack on front of cabinet in common
connection with EURO-SCART.
Headphone jack (3.5mm) on fromt of cabinet
Remote Control Unit
R - 40A01
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
S/M No. : TCP185MEF0
14/20 C4
TF
TK
TU
PAL-SECAM B/G-D/K
PAL I/I
20";42W;
21";45W.
version with teletext only
Oct. 2000
21 C6
TA
PAL B/G-SECAM L/L

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Summary of Contents for Daewoo DTA-14C4TFF

  • Page 1: Service Manual

    S/M No. : TCP185MEF0 Service Manual Color Television CHASSIS : CP-185 Model : DTA-14C4TFF DTA-20C4TF DTA-14V1TF DTA-21C6TFF 14 V1 14/20 C4 21 C6 SPECIFICATIONS Version TV standard PAL B/G PAL-SECAM B/G-D/K PAL I/I PAL B/G-SECAM L/L Sound system mono Power consumption 14";39W;...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SAFETY INSTRUCTION ........................2 SPECIFICATIONS ..........................3 1. 21 Pin EURO-SCART ........................3 2. Channel table ..........................4 3. ATTS sorting method ........................6 CIRCUIT BLOCK DIAGRAM ......................8 ALIGNMENT INSTRUCTION ......................9 1. Service mode ..........................9 2.

  • Page 3: Safety Instruction

    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 hazards, the high voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 22-23 kV (14” ) or 24-26 kV (20”...

  • Page 4: Specifications

    SPECIFICATIONS Pin EURO-SCART :...

  • Page 5: Channel Table

    SPECIFICATIONS Channel table FREQUENCY TABLE CP185 EUROP GB(IRE- EAST EUROP GB(IRE- EAST FRANCE FRANCE E CCIR LAND) OIRT E CCIR LAND) OIRT 46.25 45.75 49.75 623.25 623.25 623.25 623.25 48.25 55.75 (L') 53.75 59.25 631.25 631.25 631.25 631.25 55.25 60.5 (L') 61.75 77.25 639.25...
  • Page 6 SPECIFICATIONS EUROP GB(IRE- EAST EUROP GB(IRE- EAST FRANCE FRANCE E CCIR LAND) OIRT E CCIR LAND) OIRT 311.25 311.25 311.25 311.25 112.25 116.75 111.25 112.25 119.25 128.75 119.25 119.25 319.25 319.25 319.25 319.25 327.25 327.25 327.25 327.25 126.25 140.75 127.25 126.25 133.25 152.75...
  • Page 7 SPECIFICATIONS ATSS sorting method The TV set sweeps all the TV bands from beginning of VHF to the end of UHF. The TV controlling software for each program checks if a VPS CNI code is transmitted. If no VPS CNI code is found, the system checks if a CNI code is transmitted in the tele- text lines ( Packet 8/30 format 1 ).
  • Page 8 SPECIFICATIONS Special case : France If France is selected the TV controlling software firstly sweeps all the TV bands with France system selected (positive video modulation) and secondly with Europe system selected (negative video modulation). Special case : Switzerland If Switzerland is selected the TV controlling software firstly sweeps all the TV bands with Europe system selected (negative video modulation) and secondly with France system selected (positive video modulation).

  • Page 9: Circuit Block Diagram

    CIRCUIT BLOCK DIAGRAM...

  • Page 10: Alignment Instruction

    In Service Mode press “ OK” to stop the microcontroller i.e. the I2C bus is free and the set can be controlled by external equipment. Press “ OK” again to allow the microcontroller to control the set again Microcontroller configuration : Tuner Option Option Tuner maker DAEWOO / SAMSUNG PHILIPS ( Video processor AGC ) PHILIPS (tuner internal AGC ) System Option Option System PAL –...
  • Page 11 - Adjust H Shift to have the picture in the center of the screen. 7 - AGC - Adjust the antenna signal level to 70 dBµV± 2 for Daewoo tuner (63 dBµV± 1 for Philips tuner). - Set RF AGC to 0.
  • Page 12 AUDIO VIDEO...

  • Page 13: Exploded View

    Mechanical Exploded View...

  • Page 14: Printed Circuit Board

    PRINTED CIRCUIT BOARD...

  • Page 15: Service Parts List

    BUTTON POWER 21C6 I806 1SE110N--- SE110N M551 4855538000 DECO SENSOR 21C6 I810 TX0202DA-- THYRISTOR X0202DA M561 485562140101 MARK BRAND DAEWOO 14/20/21/C4/C6 I820 1KA7805--- IC REGULATOR KA7805 M681 4856812001 TIE CABLE NYLON66 DA100 I822 1KA7808--- IC REGULATOR KA7808 P402A 4850706057 CONN AS...
  • Page 16 SERVICE PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION LOC. PART CODE PART NAME PART DESCRIPTION R920 RF01Y109JA R FUSIBLE 1W 1 OHM J A CURVE C591 CXCH1H270J C CERA 50V CH 27PF J (TAPPING) SCT1 4859303530 SOCKET CRT PCS629-03C C592 CBXF1H104Z...
  • Page 17 SERVICE PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION LOC. PART CODE PART NAME PART DESCRIPTION C103 CCZB1H102K C CERA 50V B 1000PF K (AXIAL) D824 D1N4148--- DIODE 1N4148 (TAPPING) C104 CCZB1H102K C CERA 50V B 1000PF K (AXIAL) D825 D1N4148--- DIODE...
  • Page 18 SERVICE PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION LOC. PART CODE PART NAME PART DESCRIPTION J040 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R518 RD-AZ273J- R CARBON FILM 1/6 27K OHM J J041 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R520 RD-AZ183J- R CARBON FILM...
  • Page 19 SERVICE PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION LOC. PART CODE PART NAME PART DESCRIPTION R810 RD-4Z102J- R CARBON FILM 1/4 1K OHM J R921 RD-AZ102J- R CARBON FILM 1/6 1K OHM J R811 RC-2Z565KP R CARBON COMP 1/2 5.6M OHM K R922 RD-AZ102J-...
  • Page 20 SERVICE PAARTS LIST THE DIFFERENT PARTS FOR SYSTEM CP-185 SF01 SAW FILTER G1984M G1984M K2960M J1981M SF02 SAW FILTER L9653M PWC1 POWER CORD AS CW4232 CW4232 KKP419C CW3222 Z501 CERA FILTER TP5.5MB TP5.5MB TP5.5MB TPS6.0MB Z502 CERA FILTER TP6.5MB C801 C LINE ACROSS AC 250V 0.47 AC 250V 0.47...
  • Page 21 SERVICE PARTS LIST...
  • Page 22 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 : leesk@web.dwe.co.kr TEL : 82-2-360-7802 FAX : 82-2-360-7877...

  • Page 23: Functional Description

    APPENDIX FUNCTIONAL DESCRIPTION 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 24: Colour Decoder

    APPENDIX FUNCTIONAL DESCRIPTION The vertical synchronisation is realised by means of a divider circuit. The vertical ramp generator needs an external resistor and capacitor. For the vertical drive a differential output current is available. The outputs are DC coupled to the vertical output stage.
  • Page 25 APPENDIX FUNCTIONAL DESCRIPTION RGB output circuit and black-current stabilisation In the RGB control circuit the signal is controlled on contrast, brightness and saturation. The ICs have a linear input for external RGB signals. The signals for OSD and text are internally supplied to the control circuit. The output signal has an amplitude of about 2 Volts black-to-white at nominal input signals and nominal settings of the various controls.
  • Page 26 APPENDIX FUNCTIONAL DESCRIPTION For SECAM L and L’ the TDA9361/TDA9381 is switched to positive modulation via I2C bus. SECAM L’ transmission only occur in VHF band I and have their picture and sound carrier interchanged, compared to SECAM L and PAL B/G channels. For SECAM L’...
  • Page 27 APPENDIX FUNCTIONAL DESCRIPTION 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 1µ sec ). The fast switching pin 16 of SCART is directly connected to the TV processor pin 45 ( Fast blanking input ).
  • Page 28 APPENDIX FUNCTIONAL DESCRIPTION 5. SECAM L/L’ sound switching circuit. The microcontroller pin 4 is a three levels output. The voltage and configuration of this port is described below : Sound mode Port configuration Voltage Push Pull Internally shorted to ground AM L Push Pull Pull up to 3.3V...
  • Page 29 APPENDIX FUNCTIONAL DESCRIPTION 8. Power supply (STR F6653) 8-1. STR-F6653 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. 8-2. Power supply primary part operations An oscillator generates pulse signals which turn on and off a MOSFET transistor.
  • Page 30 APPENDIX FUNCTIONAL DESCRIPTION O.V.P.volt age 20.5V 16V (TY P.) Shutdown voltage 11V Waveform of Vin pin voltage at start- up 8-2-1. STR-F6653 oscillating operation TO PIN4 SM PS STR-F6653 DRAIN DRIVE Comp.1 V th(1) SOURCE R808 1.35mA OCP/FB From PIN 6 SM PS (FEEDBACK) V th(2)
  • Page 31 APPENDIX FUNCTIONAL DESCRIPTION 6.5 V (STR -F6653 internal capacitor) 3.7 V 0.73 V Pin 1 (OCP / FB) (M OSFET drain current) (M OSFET drain - source voltage) M O S F E T switching ON / OFF Waveforms during oscillating operation - When the MOSFET is ON, the STR-F6653 internal capacitor C1 is charged at the constant voltage 6.5V.
  • Page 32 APPENDIX FUNCTIONAL DESCRIPTION 8-2-3. STR-F6653 protection circuits overcurrent protection function (OCP) Overcurrent protection is performed pulse by pulse detecting at STR-F6653 pin 1 (OCP) the peak of the MOSFET drain current in every pulse. latch circuit This circuit sustains an output low from the STR-F6653 internal oscillator and stops operation of the power supply when over- voltage protection (OVP) and thermal shutdown (TSD) circuit are in operation thermal shutdown circuit (TSD) °...
  • Page 33 APPENDIX FUNCTIONAL DESCRIPTION 9-1-2. TV start-up and microcontroller initialisation - When SW801 power switch is pushed, main AC 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 DC voltage to I501 microcontroller power supply pins (pins 54, 56, 61) and to the reset pulse cir- cuit which provides reset pulse to I501 microcontroller reset pin (pin 60).
  • Page 34 APPENDIX FUNCTIONAL DESCRIPTION 9-1-4. 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 35 APPENDIX FUNCTIONAL DESCRIPTION In 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) So, current from 11V DC voltage (from T801 SMPS transformer pin 13) does not flow through Q811 and Q810 transistors but flows through I806 IC error amplifier - Q809 is conducting.
  • Page 36 APPENDIX FUNCTIONAL DESCRIPTION 9-2-1-3. power supply functioning during TV set normal run mode - I801 transmits controlled pulses to T801 which generates DC voltages after rectification by secondary side diodes and electrolytic capacitors (for example by D820 and C813 to give 124V -110V supply voltage line). - 8V, 5V, 3.3V supply voltage lines have stabilised voltages obtained by I822, I820, I823 voltage regulators.
  • Page 37 APPENDIX FUNCTIONAL DESCRIPTION I810 CONTROLLED RECTIFIER 6V DC HIGH R829 R830 R820 C830 HIGH Q807 Q808 HIGH POWER Q809 I810 controlled rectifier switching circuit 9-2-2-2. TV set stand-by mode operations -In stand-by mode, I501 microcontroller pin 63 (power) is set to low. - So, Q809 collector is set to high.

  • Page 38: Ic Description

    APPENDIX IC DESCRIPTION 1. TDA9361 : TV signal processor - Teletext decoder with embedded µ-Controller. TDA9381 : TV signal processor - with embedded µ-Controller. TV-signal Processor • Multi-standard vision IF circuit with alignment-free PLL demodulator • Internal (switchable) time-constant for the IF-AGC circuit •...
  • Page 39 APPENDIX IC DESCRIPTION Data Capture • Text memory 10 pages • Inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page Table (SPT) • 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 •...
  • Page 40 APPENDIX IC DESCRIPTION Data Capture Features - Video Signal Quality detector - 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...
  • Page 41 APPENDIX IC DESCRIPTION...
  • Page 42 APPENDIX IC DESCRIPTION IC marking and version IC marking Chassis OSD languages Text ( line 3 ) CP 185 DW9361/N1/3-DE1 English, French, German, Italian, Spanish, English, ( note : x is the software Dutch, Danish, Finnish, Norwegian, Swed- German, version ) ish, Greek, Hungarian, Swedish/Finnish/Hungarian, Italian, French, Portuguese/Spanish, Turk-...
  • Page 43 APPENDIX IC DESCRIPTION IFIN1 IF input 1 IFIN2 IF input 2 IREF Reference current input vertical sawtooth capacitor TUNERAGC tuner AGC output AUDEEM audio deemphasis DECSDEM decoupling sound demodulator GND2 ground 2 for TV processor SNDPLL narrow band PLL filter SNDIF n.u.
  • Page 44 APPENDIX IC DESCRIPTION...
  • Page 45 APPENDIX IC DESCRIPTION 2. TDA9830 TV sound AM-Demodulator and audio source switch The TDA9830, a monolithic integrated circuit, is designed for AM-sound demodulation used in L and L’ standard. The IC provides an audio source selector and also mute switch. Block Diagram : TDA9830...
  • Page 46 APPENDIX IC DESCRIPTION Pinning Symbol Description IFIN Sound IF differential input signal n.c. Not connected AGC capacitor REF voltage filtering capacitor n.c. Not connected AMOUT AM demodulator output AMIN Input signal from audio switch AFOUT Output signal from audio switch EXTIN Input signal (from external) to audio switch SWITCH...
  • Page 47 APPENDIX IC DESCRIPTION Pinning Symbol Description Supply voltage Audio output Supply Voltage Rejection Audio input n.c. Not Connected S-GND Signal ground n.c. Not Connected n.c. Not Connected P-GND P Ground P-GND P Ground P-GND P Ground P-GND P Ground P-GND P Ground P-GND P Ground...
  • Page 48 APPENDIX IC DESCRIPTION Pinning Symbol Description Vi(pos) input voltage (positive) Vi(neg) input voltage (negative) supply voltage output voltage B ground Vflb flyback supply voltage output voltage A guard output voltage O(guard) input measuring resistor...
  • Page 49 APPENDIX IC DESCRIPTION 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 perfor- mance, the amplifier should be used with black-current control.
  • Page 50 APPENDIX IC DESCRIPTION 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 51 APPENDIX IC DESCRIPTION 7-3. Block diagram 7-4. pin description NAME SYMBOL DESCRIPTION Overcurrent feedback O.C. P/E.B. Input of over current detection signal and feedback signal Source Mosfet source Drain Mosfet drain Supply Input of power supply for control circuit Ground Ground...
  • Page 52 APPENDIX IC DESCRIPTION 7-5. Control part - electrical characteristics IC PINS RATING DESCRIPTION SYMBOL UNIT NUMBER MIN. TYPE (on) Operation start voltage 14.4 17.6 (off) Operation stop voltage (on) Circuit current in operation (off) µA Quiescent current in non-operation (max) µSEC Maximum off time Minimum time for input of quasi resonant...

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