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NEC DTA-14V4THS Service Manual
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NEC DTA-14V4THS Service Manual

NEC DTA-14V4THS Service Manual

Chassis cp-185a
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Service Manual
Color Television
CHASSIS : CP-185A (AUSTRALIA)
Model :
DTA-14V4THS
DTA-20V4THS
DTA-21V4THS
NEC Model : N3481
N4881
FS572
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
NEC AUSTRALIA Pty. Ltd.
S/M No. : TCP185AEF0
Pal multi system
PAL-SECAM B/G, D/K, H, I/I (NTSC : AV Only)
Mono
* 1 Speaker
14":49W / 20":60W / 21" 68W
3W 8 Ohm o 7.5W 8 Ohm
Teletext
75 Ohm unbalanced
off-air channels, S-cable channels and hyperband
Ferquency synthesiser tuning system
14":34cm
20':48cm
21":51cm
On screen display
100 Programmes
RCA jack : Audio input and Vidio input & A/V
output(monitor out)
Audio - Video jack on front of cabinet in common
connection with rear RCA jack
Headphone jack on front of cabinet
R-44N08
AA Battery type
Oct. 2004

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Summary of Contents for NEC DTA-14V4THS

  • Page 1 S/M No. : TCP185AEF0 Service Manual Color Television CHASSIS : CP-185A (AUSTRALIA) Model : DTA-14V4THS DTA-20V4THS DTA-21V4THS NEC Model : N3481 N4881 FS572 Specification Version Pal multi system TV Standard PAL-SECAM B/G, D/K, H, I/I (NTSC : AV Only) Sound system...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SAFETY INSTRUCTION CIRCUIT BLOCK DIAGRAM ALIGNMENT INSTRUCTIONS 1. 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 7~33...

  • 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: Circuit Block Diagram

    CIRCUIT BLOCK DIAGRAM...

  • Page 5: Alignment Instructions

    Key 3times and volume Key 3times on front local key-board. When changed NEW EEPROM(I702), Remocon key code was changed Daewoo. In order to change NEC Remocon key code, do above procedure. TV set Alignment 1 - G2 alignment - Set TV in NORMAL I mode - TV in AV mode without video signal ? Black screen.
  • Page 6 ALIGNMENT INSTRUCTIONS 3 - Focus - Adjust the Focus volume ( on FBT ) to have the best resolution on screen. 4 - Vertical geometry - Adjust the Vertical Amplitude, Shift, S-Correction and Slope to compensate for vertical distortion 5 - Horizontal picture centering - Adjust H Shift to have the picture in the center of the screen.

  • Page 8: Exploded View

    EXPLODED VIEW 1. 14V4/20v4/21v4...

  • Page 9: Printed Circuit Board

    PCB MAIN(CP-185A)

  • Page 10: Service Parts List

    ELECTRICAL PARTS LIST In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the Caution latest parts information, please refer to PPL(Prats Price List) in Service information Center (http://svc.dwe.co.kr) Caution is a recommendable part for stock.
  • Page 11 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK C408 CMYE2D394J C MYLAR 200V PU 0.39MF J C801 CL1UC3474M C LINE ACROSS 0.47MF 1J(UCVSNDF/SV)+Q/O C804 CEYD2G101D C ELECTRO 400V FHS 100MF (22X30) C808 CH1BFE222M C CERA AC U/C/V AC400V 2200PF C824 CH1HFE102M C CERA AC...
  • Page 12 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK SW801 5S40101146 SW POWER PUSH SS-160-7-B T401 50D10A3 - TRANS DRIVE TD-10A3 T402 50H0000269 LTC-515 T801 50M2834A3- TRANS SMPS TSM-2834A3 U100 4859721530 TUNER VARACTOR DT5-BF18D N ZZ200 PTMPJ0E040 PCB MAIN (RHU) AS DTA-21V4THS C305 CEXF1E471V...
  • Page 13 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK E109 4856310600 EYE LET BSR T0.2 (R2.3) N001 4857417500 TERM PIN DA-IB0214(D2.3/DY PIN) N002 4857417500 TERM PIN DA-IB0214(D2.3/DY PIN) N003 4857417500 TERM PIN DA-IB0214(D2.3/DY PIN) N004 4857417500 TERM PIN DA-IB0214(D2.3/DY PIN) P602 485923162S CONN WAFER...
  • Page 14 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK C557 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C558 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C559 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C562 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C564 CEXF1E101V...
  • Page 15 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK Q805 TKTC3205Y- KTC3205Y (TP) Q807 TKTA1281Y- KTA1281Y Q808 TKTC3198Y- KTC3198Y Q811 TKTA1266Y- KTA1266Y (TP) Q812 TKTC3198Y- KTC3198Y Q851 TKTC3198Y- KTC3198Y Q852 TKTC3198Y- KTC3198Y R304 RN01B109JS R METAL FILM 1W 1 OHM J SMALL R306 RN01B109JS R METAL FILM...
  • Page 16 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK D120 D U Z 3 3 B DIODE ZENER UZ-33B D313 D1N4004S DIODE 1N4004S D405 D1N4937G DIODE 1N4937G (TAPPING) D407 D1N4937G DIODE 1N4937G (TAPPING) D408 D1N4937G DIODE 1N4937G (TAPPING) D450 D1N4937G DIODE 1N4937G (TAPPING) D520...
  • Page 17 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK J017 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J018 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J019 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J020 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J021 85801065GY WIRE COPPER...
  • Page 18 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK J107 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J108 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J109 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J111 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J112 85801065GY WIRE COPPER...
  • Page 19 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK R352 RD-AZ471J- R CARBON FILM 1/6 470 OHM J R354 RD-4Z229J- R CARBON FILM 1/4 2.2 OHM J R401 RD-4Z472J- R CARBON FILM 1/4 4.7K OHM J R404 RD-2Z751J- R CARBON FILM 1/2 750 OHM J R405 RD-AZ102J-...
  • Page 20 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK R555 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R556 RD-AZ562J- R CARBON FILM 1/6 5.6K OHM J R560 RD-4Z102J- R CARBON FILM 1/4 1K OHM J R561 RD-AZ221J- R CARBON FILM 1/6 220 OHM J R567 RD-AZ101J-...
  • Page 21 ELECTRICAL PARTS LIST PART CODE PART NAME DESCRIPTION REMARK R826 RD-AZ751J- R CARBON FILM 1/6 750 OHM J R827 RD-AZ473J- R CARBON FILM 1/6 47K OHM J R828 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R831 RD-AZ473J- R CARBON FILM 1/6 47K OHM J R832 RD-AZ561J-...

  • Page 22: Functional Description

    APPENDIX FUNCTIONAL DESCRIPTION For CP-185A 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 -Controller/Teletext decoder as a reference.
  • Page 23 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 24 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 25 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 26 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 1 sec). The fast switching pin 16 of SCART is directly connected to the TV processor pin 45 ( Fast blanking input ).
  • Page 27 FUNCTIONAL DESCRIPTION APPENDIX 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 28 IC DESCRIPTION APPENDIX 1. TDA9361 : TV signal processor - Teletext decoder with embedded -Controller. TV-signal Processor ¥ Multi-standard vision IF circuit with alignment-free PLL demodulator ¥ Internal (switchable) time-constant for the IF-AGC circuit ¥ Mono intercarrier with a selective FM-PLL demodulator which can be switched to the different FM sound frequencies (5.5 / 6.0 / 6.5 MHz) ¥...
  • Page 29 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 10 10 10...
  • Page 32 IC DESCRIPTION APPENDIX IC marking and version Chassis IC marking (line 3) OSD languages Text CP 185A DW9361/N2/3-EB7 English, Russian English, Russian Arabic, Melayu, Persian Arabic, Melayu, Persian PINNING SYMBOL DESCRIPTION n.u. Port 1.3 Not used. I2C bus clock line I2C Data line A/V SW Monitor Out...
  • 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 13 13 13...
  • Page 35 IC DESCRIPTION APPENDIX 2. TDA-7267A ¥ Can deliver 3w the 10% 14.5V/8‰ ¥ 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 … C Junction Temperature … C Storage Temperature Range -40 to 125 … C PIN CONNECTION (Top View) Rth with "on Board"...
  • Page 37 IC DESCRIPTION APPENDIX THERAML DATA Symbol Parameter Value unit Thermal Rasistance junction to ambient … C / W th j-amb Thermal Resistance Junction to case … C / W th j-case ELECTRICAL CHARACTERISTICS (Tamb = 25…C; Vs = 14.5V; RL=8‰; f=1KHz; nuless otherwise specified.) Symbol Parameter Test concition...
  • Page 38 IC DESCRIPTION APPENDIX 3. STV9302A fi 17 17...
  • Page 39 IC DESCRIPTION APPENDIX 18 18...
  • Page 40 IC DESCRIPTION APPENDIX 19 19...
  • Page 41 IC DESCRIPTION APPENDIX 20 20...
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  • Page 53 IC DESCRIPTION IC DESCRIPTION APPENDIX 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 54 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.

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Dta-20v4thsDta-21v4thsN3481N4881Fs572

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