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26

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.
-Then, I810 controlled rectifier gate pin is set to high and I810 is conducting.
- So, current flows from pin 16 SMPS transformer to the ground via I804 optocoupler and Q810 and Q811 transistors
(which are conducting).
- In 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

µ

com, 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

Q807

HIGH

HIGH

HIGH

LOW

POWER

LOW

I810 controlled rectifier switching circuit

APPENDIX

FUNCTIONAL DESCRIPTION

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Содержание 14C5

Страница 1: ...HARGE from the electromaniacs com community You are free to distribute this file to other persons who needs it but without of charge Also on http electromaniacs com you can find thousands of service manuals schematics free of charge ...

Страница 2: ...channels and hyperband Speaker Teletext system Aerial input Channel coverage frequency synthesiser tuning system Tuning system 10 pages memory FASTEXT FLOF or TOP version with teletext only Visual screen size Channel indication On Screen Display 14 34 cm Program Selection 100 programmes Aux terminal EURO SCART Audio Video in and Out R G B in Slow and Fast swtching SVHS in Audio Video jack on front...

Страница 3: ...2 CIRCUIT BLOCK DIAGRAM ...

Страница 4: ...ption TV set 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 desire...

Страница 5: ...AUDIO VIDEO ...

Страница 6: ...4 Mechanical Exploded View ...

Страница 7: ...A AC 4KV 4700PF M KX DE1610 C813 CEXF2C101V C ELECTRO 160V RSS 100MF 16X25 TP C814 CEXF2C101V C ELECTRO 160V RSS 100MF 16X25 TP C823 CEXF1E102V C ELECTRO 25V RSS 1000MF 13X20 TP C832 CEXF1E102V C ELECTRO 25V RSS 1000MF 13X20 TP C840 CEXF1C222V C ELECTRO 16V RSS 2200MF 13X25 TP C841 CEXF1C222V C ELECTRO 16V RSS 2200MF 13X25 TP C861 CEXF1E102V C ELECTRO 25V RSS 1000MF 13X20 TP C965 CCXB3D102K C CERA...

Страница 8: ...CCXB1H472K C CERA 50V B 4700PF K TAPPING C571 CCXB1H821K C CERA 50V B 820PF K TAPPING C585 CCXB1H222K C CERA 50V B 2200PF K TAPPING C590 CXCH1H270J C CERA 50V CH 27PF J TAPPING LOC PART CODE PART NAME PART DESCRIPTION C591 CXCH1H270J C CERA 50V CH 27PF J TAPPING C592 CBXF1H104Z C CERA SEMI 50V F 0 1MF Z TAPPING C593 CEXF1E101V C ELECTRO 25V RSS 100MF 6 3X11 TP C599 CEXF1H229V C ELECTRO 50V RSS 2 2...

Страница 9: ...4148 DIODE 1N4148 TAPPING D841 D1N4148 DIODE 1N4148 TAPPING D860 DBYW36 DIODE BYW36 TAPPING D904 DBAV21 DIODE BAV21 TAPPING D905 DBAV21 DIODE BAV21 TAPPING D906 DBAV21 DIODE BAV21 TAPPING DA02 DTZX12C DIODE ZENER TZX12C TAPPING DA03 DTZX5V1B DIODE ZENER TZX5V1B TAPPING DA04 CBZR1C222M C CERA Y5R 16V 2200PF M AXIAL DA05 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA06 DTZX5V6B DIODE ZENER TZX5V6B TAPPING ...

Страница 10: ...RBON FILM 1 6 15K OHM J R516 RD AZ393J R CARBON FILM 1 6 39K OHM J R517 RD AZ102J R CARBON FILM 1 6 1K OHM J LOC PART CODE PART NAME PART DESCRIPTION R518 RD AZ273J R CARBON FILM 1 6 27K OHM J R520 RD AZ183J R CARBON FILM 1 6 18K OHM J R521 RD AZ391J R CARBON FILM 1 6 390 OHM J R522 RD AZ221J R CARBON FILM 1 6 220 OHM J R523 RD AZ331J R CARBON FILM 1 6 330 OHM J R524 RD AZ561J R CARBON FILM 1 6 56...

Страница 11: ... 2Z102K R CARBON COMP 1 2 1K OHM K R915 RC 2Z102K R CARBON COMP 1 2 1K OHM K LOC PART CODE PART NAME PART DESCRIPTION R921 RD AZ102J R CARBON FILM 1 6 1K OHM J R922 RD AZ102J R CARBON FILM 1 6 1K OHM J R923 RD AZ102J R CARBON FILM 1 6 1K OHM J RA01 RD AZ680J R CARBON FILM 1 6 68 OHM J RA02 RD AZ101J R CARBON FILM 1 6 100 OHM J RA03 RD AZ101J R CARBON FILM 1 6 100 OHM J RA04 RD AZ101J R CARBON FILM...

Страница 12: ...7 AC 250V 0 47 AC 250V 0 47 I101 IC IF TDA9830 X X X R153 R C FILM 2 2K X X X R156 R C FILM 16K X X X R157 R C FILM 5 6K X X X R159 R C FILM 2 2K X X X R160 R C FILM 6 8K X X X R161 R C FILM 1K X X X R162 R C FILM 47K X X X R163 R C FILM 10K X X X R164 R C FILM 100 X X X Q152 TR KTC3198 X X X Q154 TR KTC3198 X X X Q155 TR KTC3198 X X X D151 DIODE 1SS85UA X X X C150 C CERA 0 01 X X X C152 C ELECTRO...

Страница 13: ...CMYT2D364J CMYT2D364J CMYT2D274J CMYT2D364J CMYT2D364J CMYT2D474J CMYT2D304J CMYT2D364J L401 L102 L76 TRL341G L76 L76 L102 L102 L102 58H0000016 58H0000020 58H0000040 58H0000020 58H0000020 58H0000016 58H0000016 58H0000016 R350 2K 1 2K 1 1 5K 1 1 5K 1 1 5K 1 1 5K 1 1 5K 1 1 5K 1 RN 4Z2001F RN 4Z2001F RN 4Z1501F RN 4Z1501F RN 4Z1501F RN 4Z1501F RN 4Z1501F RN 4Z1501F R351 2K 1 2K 1 1 5K 1 1 5K 1 1 5K ...

Страница 14: ...amplifier and AGC circuit 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 ...

Страница 15: ...rsaturation occurring when signals with 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 loca...

Страница 16: ...riod the vertical deflection 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 th...

Страница 17: ...ont RCA video input The 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 out...

Страница 18: ...th sinking and sourcing 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 ...

Страница 19: ... pins via resistors R350 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 v...

Страница 20: ...y smoothing the winding volt age which 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 vol...

Страница 21: ...V P volt age 20 5V Vin 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 FUNCTIONAL DESCRIPTION ...

Страница 22: ...he STR F6653 internal resistance 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...

Страница 23: ...This circuit triggers the 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 6...

Страница 24: ... picture appears on screen 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 ...

Страница 25: ... I501 pin 60 If the DC supply voltage 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 i...

Страница 26: ...Q810 is not conducting 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 ERR...

Страница 27: ...er supply line IC power 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 CONTRO...

Страница 28: ...which are conducting In 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 C83...

Страница 29: ...e band delay line RGB control 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 reductio...

Страница 30: ...96 colour palette Globally selectable 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...

Страница 31: ...eal time capture and decoding 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 VP...

Страница 32: ...30 IC DESCRIPTION APPENDIX ...

Страница 33: ...ESCRIPTION n u 1 Port 1 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 controll...

Страница 34: ...ssor CVBS Y 42 external 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 prog...

Страница 35: ...33 APPENDIX IC DESCRIPTION ...

Страница 36: ...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 IC DESCRIPTION APPENDIX ...

Страница 37: ...ut signal n c 2 Not connected 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 vol...

Страница 38: ...e used in the output stage 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 Rejectio...

Страница 39: ...put voltage positive 2 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 ...

Страница 40: ...MHz for an output signal of 60 Vpp 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 blac...

Страница 41: ...data in and out of the 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 ...

Страница 42: ...BOL DESCRIPTION 1 Overcurrent 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 ...

Страница 43: ...µSEC O C P F B terminal threshold voltage 1 1 5 VTH 1 0 68 0 73 0 78 V 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...

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