Daewoo DTA-14C4TFF Service Manual Download Page 1

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Service Manual

Chassis : CP-185

S/M No. : TCP185MEF0

http : //svc.dwe.co.kr

JUN. 2000

DAEWOO ELECTRONICS CO., LTD.

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; 20

”: 42W; 21

”: 45W.

Sound Output Power 2.5W (at 60% mod, 10%THD)

Speaker

3W 8 ohm

Teletext system

10 pages memory FASTEXT (FLOF or TOP)
– version with teletext only

Aerial input

75 ohm unbalanced

Channel coverage

Off-air channels, S-cable channels and hyperband

Tuning system

frequency synthesiser tuning system

Visual screen size

14 ” : 34 cm

20 ” : 48 cm

21 ” : 51 cm

Channel indication

On Screen Display

Program Selection

100 programmes

Aux. terminal

EURO-SCART : Audio / Video In and Out,
R/G/B In, Slow and Fast switching, SVHS In.
Audio-Video Jack on front of cabinet in common
connection with EURO-SCART.
Headphone jack (3.5 mm) on front of cabinet

Remote Control Unit

R-40A01

Colour Television

Model : DTA - 14C4TFF

DTA - 20C4TF
DTA - 14V1TF
DTA - 21C6TFF

RTV servis Horvat

Tel: ++385-31-856-637
Tel/fax: ++385-31-856-139
Mob: 098-788-319

www.rtv-horvat-dj.hr

All manuals and user guides at all-guides.com

all-guides.com

Summary of Contents for DTA-14C4TFF

Page 1: ...cable channels and hyperband Tuning system frequency synthesiser tuning system Visual screen size 14 34 cm 20 48 cm 21 51 cm Channel indication On Screen Display Program Selection 100 programmes Aux terminal EURO SCART Audio Video In and Out R G B In Slow and Fast switching SVHS In Audio Video Jack on front of cabinet in common connection with EURO SCART Headphone jack 3 5 mm on front of cabinet R...

Page 2: ... INSTRUCTION 9 1 Service mode 9 2 Microcontroller configuration 9 3 TV set Alignment 9 SCHEMATIC DIAGRAM 11 EXPLODED VIEW 11 PRINTED CIRCUIT BOARD 12 SERVICE PARTS LIST 13 1 The Different Parts List 18 APPENDIX Appendix is provided only by internet http svc dwe co kr FUNCTIONAL DESCRIPTION 1 IC DESCRIPTION 16 All manuals and user guides at all guides com ...

Page 3: ...icture 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 this TV receiver is blown replace it with the FUSE specified in the Replacement Parts List 3 When replacing a high wattage resistor oxide metal film resistor in circuit board keep the resistor body 10 mm away from the circuit board 4 Keep wires away fr...

Page 4: ...3 Pin EURO SCART SPECIFICATIONS All manuals and user guides at all guides com ...

Page 5: ...5 C37 599 25 599 25 599 25 599 25 C38 607 25 607 25 607 25 607 25 C39 615 25 615 25 615 25 615 25 SPECIFICATIONS CH EUROP E CCIR FRANCE GB IRE LAND EAST OIRT C40 623 25 623 25 623 25 623 25 C41 631 25 631 25 631 25 631 25 C42 639 25 639 25 639 25 639 25 C43 647 25 647 25 647 25 647 25 C44 655 25 655 25 655 25 655 25 C45 663 25 663 25 663 25 663 25 C46 671 25 671 25 671 25 671 25 C47 679 25 679 25 ...

Page 6: ...294 25 294 25 S21 303 25 303 25 303 25 SPECIFICATIONS CH EUROP E CCIR FRANCE GB IRE LAND EAST OIRT S22 311 25 311 25 311 25 311 25 S23 319 25 319 25 319 25 319 25 S24 327 25 327 25 327 25 327 25 S25 335 25 335 25 335 25 335 25 S26 343 25 343 25 343 25 343 25 S27 351 25 351 25 351 25 351 25 S28 359 25 359 25 359 25 359 25 S29 367 25 367 25 367 25 367 25 S30 375 25 375 25 375 25 375 25 S31 383 25 38...

Page 7: ... If two or more programs with the same code are found only the strongest or if they have the same level the one with the lowest frequency is listed in group I II or III The others are listed in group IV Note If two programs with the same name but a different code are found these two programs are listed in group I II or III e g Regional program SW3 in Germany The sorting order within group II III a...

Page 8: ...C1 2 BBC2 3 ITV 4 CH4 5 CH5 6 NEWS If two or more identical programs same name but different code e g BBC1 and BBC1 Scotland are found the following pro grams in the list will be shifted up 1 BBC1 2 BBC1 3 BBC2 4 ITV 5 CH4 6 CH5 7 NEWS If one of the program above is not found the associated program number remains empty freq 467 25 MHz Skip selected no name system GB example A 1 BBC1 2 BBC2 3 ITV 4...

Page 9: ...cro controller 2 3 video In video out QSS out ext video in Trap 5 5MHz SIF 5 5MHz for system B G Audio out SCART 1 Audio in SCART 1 Audio in SCART 2 28 29 49 50 52 53 36 37 58 Sound processor I601 Base bond signal I602 Audio Amplifier Video in SCART 1 SCART 2 Switching circuit switch control from 8 I501 and 8 SCART 1 To CRT board RGB out ext RGB in chroma in All manuals and user guides at all guid...

Page 10: ... Alignment 1 G2 alignment Set TV in NORMAL I mode TV in AV mode without video signal Black screen TV preset with WP Red WP Green and WP Blue equal to 32 TV preset with Black R Black G equal to 8 Adjust screen volume on FBT such that the highest cathode cut off voltage measured on CRT board is Vcut off 5V 2 White balance Select a dark picture and adjust Black G and Black R to the desired colour tem...

Page 11: ...stortion 5 Horizontal picture centering 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 62 dBµV 2 for Philips tuner Set RF AGC to 0 Increase RF AGC level and stop when the level on pin 6 of I501 goes below 2 5 Vdc ALIGNMENT INSTRUCTIONS All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 12: ...AUDIO VIDEO RTV servis Horvat Tel 385 31 856 637 Tel fax 385 31 856 139 Mob 098 788 319 www rtv horvat dj hr All manuals and user guides at all guides com ...

Page 13: ...1 13 12 9 PC BK 1 4856013302 2 1 CR T2 0 4856215402 1 5 TT2 TRS 4X14 MFZN BK 7172401412 4 1 1 1 4945801 5541201 4851915401 HIPS BK 4854945801 1 1 1 1 1 1 2 8 7128301212 1 HIPS BK 4852073601 HIPS BK 4852326511 1 SWPA PIE 0 5 4856716000 ABS BK 2326511 4856401 6716000 PMMA MILKY EGI T0 5 18 17 16 1 4855313101 4855541201 4852067101 4854856401 4852539601 16 1 16 15 14 3 14 2 14 1 14 13 12 11 10 9 1 9 8...

Page 14: ...commendable part for stock is safety component so it must be used the same component Caution R C415 CEXF2E100V C ELECTRO 250V RSS 10MF 10X20 TP C603 CEXF1C471V C ELECTRO 16V RSS 470MF 10X12 5 TP C801 CL1SC3474M C LINE ACROSS 275V 0 47MF C805 CEYN2G121P C ELECTRO 400V LHS 120MF C810 CCXB3D102K C CERA 2KV B 1000 PF K TAPPING C812 CH1AFE472M C CERA AC 4KV 4700PF M KX DE1610 C813 CEXF2C101V C ELECTRO ...

Page 15: ...ON SERVICE PARTS LIST R R R C500 CEXF1H478V C ELECTRO 50V RSS 0 47MF 5X11 TP C501 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP C502 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP C504 CMXM2A332J C MYLAR 100V 3300PF J TP C509 CEXF1E470V C ELECTRO 25V RSS 47MF 5X11 TP C511 CMXB1H224J C MYLAR 50V EU 0 22MF J TP C512 CMXB1H224J C MYLAR 50V EU 0 22MF J TP C513 CBXF1H104Z C CERA SEMI 50V F 0 1MF Z TAPPING C514 ...

Page 16: ...F 0 022MF Z C535 CCZF1H223Z C CERA 50V F 0 022MF Z LOC PART CODE PART NAME PART DESCRIPTION SERVICE PARTS LIST C536 CCZF1H223Z C CERA 50V F 0 022MF Z C577 CCZB1H561K C CERA 50V B 560PF K AXIAL C587 CCZB1H101K C CERA 50V B 100PF K AXIAL C588 CCZB1H101K C CERA 50V B 100PF K AXIAL C589 CCZB1H101K C CERA 50V B 100PF K AXIAL C771 CBZF1H104Z C CERA SEMI 50V F 0 1MF Z AXIAL C809 CCZB1H102K C CERA 50V B 1...

Page 17: ...ARBON FILM 1 6 1K OHM J LOC PART CODE PART NAME PART DESCRIPTION SERVICE PARTS LIST R340 RD 4Z473J R CARBON FILM 1 4 47K OHM J R341 RD 2Z332J R CARBON FILM 1 2 3 3K OHM J R350 RN 4Z2001F R METAL FILM 1 4 2 0K OHM F R351 RN 4Z2001F R METAL FILM 1 4 2 0K OHM F R355 RD AZ272J R CARBON FILM 1 6 2 7K OHM J R356 RD 4Z562J R CARBON FILM 1 4 5 6K OHM J R360 RD 4Z564J R CARBON FILM 1 4 560K OHM J R390 RD 4...

Page 18: ...RD AZ102J R CARBON FILM 1 6 1K OHM J R821 RD 4Z102J R CARBON FILM 1 4 1K OHM J R823 RD 4Z302J R CARBON FILM 1 4 3K OHM J R829 RD AZ223J R CARBON FILM 1 6 22K OHM J R830 RD AZ332J R CARBON FILM 1 6 3 3K OHM J R840 RD 4Z220J R CARBON FILM 1 4 22 OHM J R841 RD 2Z479J R CARBON FILM 1 2 4 7 OHM J R850 RD 2Z479J R CARBON FILM 1 2 4 7 OHM J R855 RD 4Z185J R CARBON FILM 1 4 1 8M OHM J R870 RD 4Z222J R CAR...

Page 19: ... 4Z302J 85801065GY RD 4Z512J 85801065GY R920 1W 2 JA F 1W 0 47 JA F 1W 1 JA F 1W 0 18 JA F RF01Y200JA RF01Y478JA RF01Y100JA RF01Y188JA THE DIFFERENT PARTS FOR SYSTEM CP 185 LOC NAME TA TF TK TU SF01 SAW FILTER G1984M G1984M K2960M J1981M SFO2 SAW FILTER L9653M X X X PWC1 POWER CORD AS CW4232 CW4232 KKP419C CW3222 Z501 CERA FILTER TPS5 5MB TPS5 5MB TPS5 5MB TPS6 0MB Z502 CERA FILTER TPS6 5MB X X X ...

Page 20: ...it The nominal frequency of the demodulator is tuned to the required frequency 5 5 6 0 6 5 MHz by means of a calibra tion circuit which uses the clock frequency of the microcontroller as a reference Selection of the required frequency is done by the controlling software 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 ...

Page 21: ...ith a high chroma to burst ratio are received The ACL circuit is designed such that it only reduces the chroma signal and not the burst signal This has the advantage that the colour sensitivity is not affected by this function SOFTWARE CONTROL The CPU communicates with the peripheral functions using Special function Registers SFRS which are addressed as RAM locations The registers for the Teletext...

Page 22: ...tion is placed in an overscan position so that the discharge is not visible on the screen 2 IF The TDA9361 TDA9381 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 by...

Page 23: ...controlling software via I2C bus selects the signal source Video signal from tuner Pin 40 External video External SVHS from SCART The sound source switching is done in the video processor part and in the AM demodulator by the µ Controller via I2C bus The video processor pin 28 has multiple functions and provides in this application Deemphasis time constant Audio monitor output External AM input De...

Page 24: ... is active which leads to steep slopes The levels are 0 and Vddp the supply voltage 3 3Volts 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 These pins are used for driving LED s via a series current limiting...

Page 25: ... and R351 The differential input voltage is compared with the output current through the deflection coils measured as voltage across R302 which provides internal feed back information The voltage across R302 is proportional to the output current Flyback voltage The flyback voltage is determined by an additional supply voltage Vfb The principle of operation with two supply voltages class G makes it...

Page 26: ...ich appears between pin 6 and pin 7 of the SMPS transformer As this winding voltage does not increase to the set voltage immediately after the control circuit starts operating VIN starts drop ping However as this winding voltage reaches the set value before VIN voltage drops to the shutdown voltage at 11V the con trol circuit continues operating see below VIN voltage at start up Resistor R805 prev...

Page 27: ...t Waveform of Vin pin voltage at start up TO PIN4 SM PS 2 3 1 5 GND R804 C850 OCP FB From PIN 6 SM PS FEEDBACK SOURCE R808 DRAIN DRIVE OSC Rg2 Rg1 Comp 2 Comp 1 C1 R1 STR F6653 1 35mA V th 1 V th 2 Oscillating operation APPENDIX ALIGNMENT INSTRUCTIONS All manuals and user guides at all guides com ...

Page 28: ...sistance R1 So C1 voltage starts falling in accordance to the gradient regulated by the constant dis charging time of C1 and R1 So this means that the fixed time determined by C1 and R1 is the OFF time of the MOSFET When C1 voltage falls to around 3 7V the STR F6653 internal oscillator is reversed again and the MOSFET turns ON C1 is quickly charged to around 6 5V The MOSFET continues to oscillate ...

Page 29: ...he latch circuit when the frame temperature of STR F6653 IC exceeds 140 C overvoltage protection circuit OVP This circuit triggers the latch circuit when the Vin voltage exceeds 22V typ 9 TV start up TV normal run and stand by mode operations 9 1 TV start up operations 9 1 1 Schematic diagram for start up operations I823 REG 3 3V IN GND OUT 1 2 3 RESET PULSE CIRCUIT IN OUT 63 60 54 56 61 L511 L510...

Page 30: ...een I501 IC doesn t provide horizon tal drive voltage Then the microcontroller consults I702 EEPROM via I2C bus to know the last TV set mode normal run mode or stand by mode before switching off 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 o...

Page 31: ...ge 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 is necessary to guarantee a defined reset pulse duration 9 2 TV normal run and stand by mode operations Depending on remote control commands I501 microcontroller part pin 63 power is set to high for normal run mode l...

Page 32: ...and no current flows from Q810 collector to the ground Therefore the power circuit diagram is the following one 9 2 1 2 power supply circuit diagram during TV set normal run I820 5V REGULATOR I823 3 3V REGULATOR 14 5V CP785 12 5V CP385 5V 3 3V 3 3 1 1 11V 8V 6V 1 3 143V CP785 123V 113V CP385 D820 D860 D830 D831 C832 C823 C861 9 12 13 16 2 4 C813 R823 R810 11V 2 3 I806 IC ERROR AMPLIFIER 14 5V 12 5...

Page 33: ... supply delivery Remarks 124V 110V FBT FBT supplies 45V to I301 vertical IC FBT supplies 14V to I301 vertical IC FBT supplies 33V to the tuner FBT supplies 185V to I901 video amplifier pin 6 13 5V I601 pin 1 11V T401 H drive 8V I501 Main IC pins 14 39 6V I703 IR receiver pin 1 5V I702 EEPROM pin 8 tuner 3 3V Main IC µcom part pins 54 56 61 2 4 3 DRAIN I801 MOF SET AND CONTROL IC 1 MAIN AC VOLTAGE ...

Page 34: ... these conditions I801 delivers pulses on light mode and T801 produces voltages with reduced power As I810 is conducting current flows also from pin 16 SMPS transformer to I823 3 3V regulator for I501 µcom IR receiver and front mask buttons supply voltage then remote control or front mask buttons can be activated to leave stand by mode I810 CONTROLLED RECTIFIER R820 R830 C830 R829 Q808 6V DC Q809 ...

Page 35: ...ontrol circuit with Continuous Cathode Calibration white point and black level off set adjustment so that the colour temperature of the dark and the bright parts of the screen can be chosen independently Linear RGB or YUV input with fast blanking for external RGB YUV sources The Text OSD signals are internally supplied from the µ Controller Teletext decoder Contrast reduction possibility during mi...

Page 36: ...le scan lines per row 9 10 13 16 and character matrix 12x10 12xl3 12x16 VxH Fringing Shadow selectable from N S E W direction Fringe colour selectable Meshing of defined area Contrast reduction of defined area Cursor Special Graphics Characters with two planes allowing four colours per character 32 software redefinable On Screen display characters 4 WST Character sets GO G2 in single device e g La...

Page 37: ...coding 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 Table TPT and Subtitle Page Table SPT Automatic detection of FASTEXT transmission Real time packet 26 engine in Hardware for processing accented G2 and G3 characters Signal quality detector for WST VPS data types Comprehens...

Page 38: ...19 IC DESCRIPTION APPENDIX All manuals and user guides at all guides com ...

Page 39: ... 3 Not used SCL 2 I2C bus clock line SDA 3 I2C Data line SECAM L out 4 Port 2 0 FM sound PushPull Low AM SECAM L PushPull High AM SECAM L High Impedance OCP 5 Port 3 0 Over Current Protection RF AGC in 6 ADC 1 For program sorting in ATSS High Impedance Key in 7 ADC 2 local key input High impedance S SW 8 ADC 3 Scart Slow switching input VssC P 9 digital ground for µ controller core and peripheral ...

Page 40: ... CVBS Y input CHROMA 43 chrominance input SVHS AUDOUT 44 audio out INSSW2 45 2nd RGB insertion input R2IN 46 2nd R input 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 decoder and digital supply of TV Processor 3 3V VPE 55 OTP programming supply VDDC 56 ...

Page 41: ...22 APPENDIX IC DESCRIPTION All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 42: ... 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 IC DESCRIPTION APPENDIX All manuals and user guides at all guides com ...

Page 43: ...nnected CAGC 3 AGC capacitor CREF 4 REF voltage filtering capacitor n c 5 Not connected AMOUT 6 AM demodulator output AMIN 7 Input signal from audio switch AFOUT 8 Output signal from audio switch EXTIN 9 Input signal from external to audio switch SWITCH 10 Switch input select control VP2 11 Supply voltage 12V alternative MUTE 12 Mute control GND 13 Ground 0V VP1 14 Supply voltage 5V to 8V n c 15 N...

Page 44: ...age because of the absence of second breakdown 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 Symbol Pin Description Vcc 1 Supply voltage OUT 2 Audio output SVR 3 Supply Voltage Rejection IN 4 Audio input n c ...

Page 45: ...Vi neg input voltage negative 3 Vp supply voltage 4 VOB output voltage B 5 GND ground 6 Vflb flyback supply voltage 7 VOA output voltage A 8 VO guard guard output voltage 9 VM input measuring resistor APPENDIX IC DESCRIPTION All manuals and user guides at all guides com ...

Page 46: ...High slew rate of 900V µs No external components required Very simple application Single supply voltage of 200V Internal reference voltage of 2 5 V Fixed gain of 50 Black current stabilisation BCS circuit Thermal protection Pin description Pin Symbol Description 1 Vi 1 inverting input 1 2 Vi 2 inverting input 2 3 Vi 3 inverting input 3 4 GND ground fin 5 Iom black current measurement output 6 VDD ...

Page 47: ...memory Serial Data SDA The SDA pin is bi directional and is used to transfer data in or out of the memory 7 STR F6653 7 1 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 7 2 features Small SIP fully isolated moulded 5 pins package Many protection functions Pulse by pulse overcurrent pr...

Page 48: ...urrent feedback O C P E B Input of over current detection signal and feedback signal 2 Source S Mosfet source 3 Drain D Mosfet drain 4 Supply VIN Input of power supply for control circuit 5 Ground GND Ground IC DESCRIPTION APPENDIX All manuals and user guides at all guides com ...

Page 49: ...O C P F B terminal threshold voltage 2 1 5 VTH 2 1 3 1 45 1 6 V O C P F B terminal extraction current 1 2 IOCP FB 1 2 1 35 1 5 mA OVP operation voltage 4 5 VIN OVP 20 5 22 5 24 5 V Latch circuit sustaining voltage 4 5 IIN H 400 µA Latch circuit release voltage 4 5 VIN Loff 6 6 8 4 V Thermal shutdown operating temperature Tj TSD 140 0C DESCRIPTION IC PINS SYMBOL RATING UNIT NUMBER MIN TYPE MAX Drai...

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