Daewoo DTB-21U6 Service Manual
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Daewoo DTB-21U6 Service Manual

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Service Manual

Color Television
CHASSIS : CP-185F
MODEL : DTB-21U6
Specification
Version
TV Standard
Sound system
Power consumption
Speaker
Teletext system
Aerial Input
Channel coverage
Tuning system
Visual screen size
Channel indication
Program selection
Auxiliary Outpup Terminal
Remote control
 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. : TCP185FEF0
Pal multi system
PAL-SECAM B/G, D/K, H, I/I (NTSC : AV Only)
Mono
74W
10%
Test condition is max(control all max)
3W 8 Ohm o 7.5W 8 Ohm
Option
75 Ohm unbalanced
Off-air channels, S-cable channels and hyperband
Ferquency synthesiser tuning system
21":51cm FLAT
On screen display
100 Programmes
RCA jack : Audio input and Vidio input
ERUO SCART Jack : Audio/Video and R/G/B input.
Sloe and fast swtching, SVHsin
Audio - Video jack on front of cabinet in common
connection with EURO-SCART
Headphone jack on front of cabinet
R-40A10 (None teletext)
AAA Battery type
R-40A01(With teletext)
AAA Battery type
R-44C05(With teletext)
AA Battery type
Aug. 2002

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Summary of Contents for Daewoo DTB-21U6

  • Page 1: Service Manual

    S/M No. : TCP185FEF0 Service Manual Color Television CHASSIS : CP-185F MODEL : DTB-21U6 Specification Version Pal multi system TV Standard PAL-SECAM B/G, D/K, H, I/I (NTSC : AV Only) Sound system Mono Power consumption Test condition is max(control all max) Speaker 3W 8 Ohm o 7.5W 8 Ohm...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SAFETY INSTRUCTION SPECIFICATIONS 21 Pin EURO-SCART CIRCUIT BLOCK DIAGRAM ALIGNMENT INSTRUCTIONS 1. Microcontroller configuration : Service mode 2. Microcontroller configuration 3. TV SET Alignment SCHEMATIC DIAGRAM EXPLODED VIEW PRINTED CIRCUIT BOARD SERVICE PARTS LIST APPENDIX (Appendix is provide only by internet [http://svc.dwe.co.kr]) FUNCTIONAL DESCRIPTION IC DESCRIPTION...

  • 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"-21")at max beam current.

  • Page 4: Specifications

    SPECIFICATIONS 21Pin EURO-SCART SIGNAL DESCRIPTION MATCHING VALUE Audio Output Right 0.5 Vrms, Impedance < 1kΩ, (RF 54% Mod) Audio Input Right 0.5Vrms, Impedance > 10kΩ Audio Output Left 0.5 Vrms, Impedance < 1kΩ, (RF 54% Mod) Audio Earth Blue Earth Audio Input Left 0.5Vrms, Impedance >...

  • Page 5: Circuit Block Diagram

    CIRCUIT BLOCK DIAGRAM...

  • Page 6: Alignment Instructions

    Press "OK" again to allow the microcontroller to control the set again Microcontroller configuration : Tuner Option Option Tuner maker DAEWOO / SAMSUNG LIPS (tuner internal AGC ) PHILIPS ( Video processor AGC ) TV set Alignment 1 - G2 alignment - Set TV in NORMAL I mode - TV in AV mode without video signal ? Black screen.
  • Page 7 - Adjust H Shift to have the picture in the center of the screen. 7 - AGC - Adjust the antenna signal level to 68dBµV 2 for Daewoo tuner (63dBµV 1 for Philips tuner) - Set RF AGC to 0.

  • Page 8: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 9: Exploded View

    EXPLODED VIEW DTB-21U6...

  • Page 10: Printed Circuit Board

    PRINTED CIRCUIT BOARD...
  • Page 11 ELECTRICAL PARTS LIST CAUTION : In this Service 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) PART CODE PART NAME...
  • Page 12 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK 2291050616 FLUX SOLDER JS-64T3 2291050301 FLUX SOLVENT IM-1000 C404 CMYH3C912J C MYLAR 1.6KV BUP 9100PF J C408 CMYE2D274J C MYLAR 200V PU 0.27MF J C801 CL1UC3104M C LINE ACROSS WORLD AC250V 0.1UF M R.47 C804 CEYN2W151P C ELECTRO...
  • Page 13 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK SCT1 4859303530 SOCKET CRT PCS629-03C SF01 5PK2960M— FILTER SAW K2960M SW801 5S40101143 SW POWER PUSH PS3-22SP (P.C.B) T401 50D10A3—- TRANS DRIVE TD-10A3 T402 50H0000230 FFA64019M T802 50M4242C2- TRANS SMPS TSM-4242C2 U100 4859722630 TUNER VARACTOR TECC2949PG35W...
  • Page 14 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK E022 4856310300 EYE LET BSR T0.2 (R1.6) E023 4856310300 EYE LET BSR T0.2 (R1.6) E024 4856310300 EYE LET BSR T0.2 (R1.6) E102 4856310600 EYE LET BSR T0.2 (R2.3) E103 4856310600 EYE LET BSR T0.2 (R2.3) E104 4856310600...
  • Page 15 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK C420 CCXB1H102K C CERA 50V B 1000PF K (TAPPING) C421 CEXF1C101V C ELECTRO 16V RSS 100MF (6.3X11) TP C423 CCXB2H561K C CERA 500V B 560PF K (TAPPING) C502 CEXF1E470V C ELECTRO 25V RSS 47MF (5X11) TP C504 CMXM2A332J...
  • Page 16 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK C815 CEXF1E101V C ELECTRO 25V RSS 100MF (6.3X11) TP C816 CEXF1E101V C ELECTRO 25V RSS 100MF (6.3X11) TP C817 CEXF1E101V C ELECTRO 25V RSS 100MF (6.3X11) TP C819 CEXF1E470V C ELECTRO 25V RSS 47MF (5X11) TP C822 CMXM2A104J...
  • Page 17 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK C531 CCZF1H473Z C CERA 50V F 0.047MF Z C533 CCZB1H102K C CERA 50V B 1000PF K (AXIAL) C534 CCZF1H223Z C CERA 50V F 0.022MF Z C535 CCZF1H223Z C CERA 50V F 0.022MF Z C536 CCZF1H223Z C CERA...
  • Page 18 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK D820 DUZ2R7B—- DIODE ZENER UZ-2.7B D821 DRGP15J—- DIODE RGP15J DA03 DUZ5R1B—- DIODE ZENER UZ-5.1B DA04 DUZ5R6BM— DIODE ZENER UZ-5.6BM DA05 DUZ5R6BM— DIODE ZENER UZ-5.6BM DA06 DUZ5R6BM— DIODE ZENER UZ-5.6BM DA08 DUZ5R6BM— DIODE ZENER UZ-5.6BM DA09...
  • Page 19 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK J041 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J042 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J043 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J044 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J045 85801065GY WIRE COPPER...
  • Page 20 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK J091 RD-4Z102J- R CARBON FILM 1/4 1K OHM J J092 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J093 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J094 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING L101 5CPZ100K02 COIL PEAKING...
  • Page 21 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK R508 RD-AZ332J- R CARBON FILM 1/6 3.3K OHM J R509 RD-AZ681J- R CARBON FILM 1/6 680 OHM J R512 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R513 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R514 85801065GY...
  • Page 22 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK R829 RD-AZ102J- R CARBON FILM 1/6 1K OHM J R830 RD-AZ151J- R CARBON FILM 1/6 150 OHM J R831 RD-4Z100J- R CARBON FILM 1/4 10 OHM J R901 RD-AZ102J- R CARBON FILM 1/6 1K OHM J R902 RD-AZ102J-...

  • Page 23: Functional Description

    APPENDIX FUNCTIONAL DESCRIPTION For CP-185C/N 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

    FUNCTIONAL DESCRIPTION APPENDIX 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 FUNCTIONAL DESCRIPTION APPENDIX RGB output circuit and black-current stabilization 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: Source Switching

    FUNCTIONAL DESCRIPTION APPENDIX 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.
  • Page 27 FUNCTIONAL DESCRIPTION APPENDIX 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: Ic Description

    IC DESCRIPTION APPENDIX 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 29: Data Capture

    IC DESCRIPTION APPENDIX 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 30 IC DESCRIPTION APPENDIX 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 31 IC DESCRIPTION APPENDIX...

  • Page 32: Ic Marking And Version

    IC DESCRIPTION APPENDIX IC marking and version Chassis IC marking (line 3) OSD languages Text CP 185 DW9361/N1/3-DE1 English, Russian English, Russian (note : x is the software version) Arabic, Melayu Arabic, Melayu CP 185N/C DW9381/N3-DE1 English, Russian, Arabic (note : x is the software version) Melayu, Thailand, HIND PINNING SYMBOL...
  • Page 33 IC DESCRIPTION APPENDIX SYMBOL 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 34 IC DESCRIPTION APPENDIX...
  • Page 35 IC DESCRIPTION APPENDIX 2. TDA-7267A • Can deliver 3w the 10% 14.5V/8Ω • Internal fixed gain 32dB • No feedback capacitor • No boucherot cell • Thermal protection • Ac short circuit trotection PowerDIP 8+8 • Svr capacitor for better ripple Rejection •...
  • Page 36 IC DESCRIPTION APPENDIX ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value unit Operating Supply Voltage Output Put Peak Current Operating Temperature Range 0 to 70 ºC Junction Temperature ºC Storage Temperature Range -40 to 125 ºC PIN CONNECTION (Top View) Rth with "on Board" Square heat Sink vs. Copper Area Example of heatsink using PC board copper...

  • Page 37: Electrical Characteristics

    IC DESCRIPTION APPENDIX THERAML DATA Symbol Parameter Value unit Thermal Rasistance junction to ambient ºC/W th j-amb Thermal Resistance Junction to case ºC/W th j-case ELECTRICAL CHARACTERISTICS (Tamb = 25ºC; Vs = 14.5V; RL=8Ω; f=1KHz; nuless otherwise specified.) Symbol Parameter Test concition Min.

  • Page 38: Tda8357J Vertical Amplifier

    IC DESCRIPTION APPENDIX 3. TDA8357J Vertical Amplifier The TDA8357J is a power circuit for use in 90º TV systems for field frequencies of 25 to 200Hz and 16/9 picture tubes. The cir-cuit 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 be DC coupled.
  • Page 39 IC DESCRIPTION APPENDIX Pinning Symbol Description input voltage (positive) i(pos) input voltage (negative) i(neg) supply voltage output voltage B ground flyback supply voltage output voltage A guard output voltage O(guard) input measuring resistor...

  • Page 40: Pin Description

    IC DESCRIPTION APPENDIX 4. 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 41: C08 8 Kbit Eeprom

    IC DESCRIPTION APPENDIX 5. 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 42 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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