TV2KR - TXT - Hobbielektronika.hu
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1.2. 7 L R3 far FI 45k 390 om 018 VT5 018 to FRONT AV BF422 8 X402 8 8 014 c126 S 8 3 c1 22n e Zz 8 H vis Y ES x T BF423 47 Y E s T s V SLA IE re a a alela casa cnet f I KI vsat A 5 sie Ll 5 C105 330p a E a en 8 sole Be 22n 8 S Sa Y En E eh Y gt E 5 Meda zek STS ES JO 19 je riot lt 2 s Ze ME kaki LO JAZ aki OV t PA PA T 5 A y 10 Aris 2 L 713 3k F al E N NL S x bis As g x 3 JIS a T UU 52 A ze El Tle cd Sal as _ Ps MENU Y c19 z x lt lt a El j as in amp 47 4 En
3. RGP15J 22k 3 13 VD501 5 S 4 5 1N4148 2 za 8 8 VD306 es FLYB 506 gt 3 El 3 3 150k E di gt T d vps05 R505 1k l 2 al 2 TF 8 1N4148 5 22 g 8 8 1N4148 ki Pa al S B u aks L501 gt 8 2 R311 C31 110 NON 502 FOCUS gt RV1 10 om 1 0 16507 ar HT SCREEN 2200 S 8 E 20 gl I 7 m L301 310 L I MZ72K18RM279 VD315 VT502 Si C508 BSR52 sos di mal 47n 11 SITE l y ET2448 512 ip gt I 312 PSU B80 HDR 2 u SI cs10 X502 4 5 100n ST1803DHI eO T a B C320 C323 R318 680p VD506 2 2 5 VD507 E p ON H H 3 1 RGP15J 4 7n in 1N4148 M T Z R509 F301 R322 2 R325 VD509 514 470p T T 5 cat css 1000 a non 220V 3 15 A 820k C321 12m 12 1N4002 KTTS l R512 8 W 47 0 AN DEGAUSSING COIL 4 4 4 4 C322 ETH 1N4002 2 4 om Woon m EE ce e we ana A 2005 01 07 y lol E A LA p s l a po x L L 7 E a led A Y z ME a AL IE 2 V gt A A lt P da J 5 EH s N fe LIN Z IK GA 0 SS E TAY y 8 yo li y a VD312 He L Ou 94 NY H ae EE T D gt W 1 AK 4 h se if ee W ig 2989 5 NP ae 2 l T EAS NO z As i GT
4. CVBS Y 42 external CVBS Y input CHROMA 43 chrominance input SVHS AUDOUT AMOUT 44 audio output AM audio output volume controlled INSSW2 45 2nd RGB YUV insertion input R2 VIN 46 2nd R input V R Y input G2 YIN 47 2nd G input Y input B2 UIN 48 2nd B input U B Y input BCLIN 49 beam current limiter input V guard input BLKIN 50 black current input V guard input RO 51 Red output GO 52 Green output BO 53 Blue output analog supply of Teletext decoder and digital supply of VODA di TV processor 3 3 V VPE 55 OTP Programming Voltage VDDC 56 digital supply to core 3 3 V OSCGND 57 oscillator ground supply XTALIN 58 crystal oscillator input XTALOUT 59 crystal oscillator output RESET 60 reset VDDP 61 digital supply to periphery 3 3 V P1 0 INT1 62 port 1 0 or external interrupt 1 input P1 1 TO 63 port 1 1 or Counter Timer 0 input P1 2 INTO 64 port 1 2 or external interrupt 0 input STV9302A The STV9302A is a vertical deflection booster designed for TV and monitor applications This device supplied with up to 35V provides up to 2App output current to drive the vertical deflection yoke The internal flyback generator delivers flyback voltages up to 70V In double supply applications a stand by state will be reached by stopping the supply alone Features e Power Amplifier e Flyback Generator e Output Current up to 2App e Thermal Protection e Stand by Control PINNING 1 Input Inverting Su
5. LEDs VSSA 12 analog ground of Teletext decoder and digital ground of TV processor SECPLL 13 SECAM PLL decoupling VP2 14 2nd supply voltage TV processor 8V DECDIG 15 decoupling digital supply of TV processor PH2LF 16 phase 2 filter PH1LF 17 phase 1 filter GND3 18 ground 3 for TV processor DECBG 19 bandgap decoupling AVL EWD 20 Automatic Volume Levelling East West drive output VDRB 21 vertical drive B output VDRA 22 vertical drive A output IFIN1 23 IF input 1 IFIN2 24 IF input 2 IREF 25 reference current input VSC 26 vertical sawtooth capacitor TUNERAGC 27 tuner AGC output AUDEEM SIFIN1 28 audio deemphasis or SIF input 1 DECSDEM SIFIN2 29 decoupling sound demodulator or SIF input 2 GND2 30 ground 2 for TV processor SNDPLL SIFAGC 31 narrow band PLL filter AGC sound IF AVLISNDIF REFO AMOUT 32 Automatic Volume Levelling sound IF input subcarrier reference output AM output non controlled HOUT 33 horizontal output FBISO output 34 flyback input sandcastle AUDEXT QSSO AMOUT 35 external audio input QSS intercarrier out AM audio output non controlled EHTO 36 EHT overvoltage protection input PLLIF 37 IF PLL loop filter IFVO SVO 38 IF video output selected CVBS output VP1 39 main supply voltage TV processor 8V CVBSINT 40 internal CVBS input GND1 41 ground 1 for TV processor
6. control in service mode 32 16 9 16 9 mode enabled 1 IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM e TDA9351 e STV9302 e TDA7056A e 24C08W6 e 74HC4053 e UC3842 TDA9351 The various versions of the TDA935X 6X 8XPS N2 series combine the functions of a TV signal processor together with a u Controller and US Closed Caption decoder Most versions have a Teletext decoder on board The Teletext decoder has an internal RAM memory for 1 or 10 page text The ICs are intended to be used in economy television receivers with 90 and 110 picture tubes The ICs have supply voltages of 8 V and 3 3 V and they are mounted in S DIP envelope with 64 pins Features TV signal processor e Multi standard vision IF circuit with alignment free PLL demodulator e Internal switchable time constant for the IF AGC circuit e A choice can be made between versions with mono intercarrier sound FM demodulator and versions with QSS IF amplifier e The mono intercarrier sound versions have a selective FM PLL demodulator which can be switched to the different FM sound frequencies 4 5 5 5 6 0 6 5 MHz The quality of this system is such that the external band pass filters can be omitted e Source selection between internal CVBS and external CVBS or Y C signals e Integrated chrominance trap circuit e Integrated luminance delay line with adjustable delay time e Picture improvement features with peaking with variable centre frequency a
7. gt lt gt K101 FE Bn m daa x 47 e 2 T sa J J 7 x L111 A 8 el SZ 4 3 MA tour 4 CIS S Su 8 z z z z z z lt R122 gt E85 470 F SL ial lla al Z a Se E ES 8 a E 3 Hl To 8 x 220 CRT BOARD 19 32 8 5 2 5 5 102 JA re Se 22n 6 gt 41 0 ajo a KAJ L103 5 R123 o 8 S 2 Y y e 1 uH Elo 27 uH 8 S a E 100 om L101 z E E gt gt lt Les 3 o ol Z 4 22 uH gt 3 4 fe D aA a TL lt a z G g lt l lt gt a a lt yy TUBE VARIANTS ER 20 E R202 10om 8 2 SI a za Ql Z z E g g J a lt amp gt R2 g sh 0203 a 2 gt do E k 4 x 22 0 oj E L202 C204 15 88 5 8 8 L ct i a a aun TN 8 ee e iii 100 om a 1k Hi gx 2 m m SE 5 co 2 2 2 z 2 2 kans VT102 5 8 2 2n A el 8 5 121 BC547 Si TOn 115 lt 5 C208 2 33 ANANA 30 a x _ 4 li to FRONT BOARD 8b 10 0 VT204 a E L201 33uH S 100 0 557 R241 T a r lt me TS gt R210 1k L204 36 100 om 8 vD20i Sgun a 5 24v AP 8 sl Koh OFF OFF R215 R216 tok 10k s oe OFF g E 105 uH 39 uH 105 uH e o Pal CFO801 CFO801 CF0801 ol DW Nas R221 100 om 8 R228 L sda 1 ol 4780 a780 4780 TU101 R prye 3 3 100 orr224 re T pen on 135 c24 3 5 5 a 3 3 15 R605 W 1104 91 k a S 2 a 2 al O Ton z 2 3 gl AUD R
8. 601 1 8k 2 H2 2 Br S S 5 ul L___4 a a lt B c119 E lt 30V 5 _ p 2 2V 605 2 5V X601 ce 2 a E z a z Y E z 220n 47 5 8 2 B 33 A van zg 5 R604 NC Se 38 2 2328 8 o Qe 2 T 23 SNG 5 2 2 2 om 5 8 1105 E a E l Be st 3 5V Mi E 22 uH S 9 ELSA AA E L ao ind ceos L X2 z 2 gt O Z Z Z 2 u 602 Z w po amp 2 2xXY00 gt gt a a 470 0 8 5V oj d J 1n R135 al 15 100 om gt a AL SDA CX 5 sl ef a mZ R136 E gt 342 B IC601 TDA7056A 4 scltun 190 om HE lt EPI E SCL aS al 24 ei D 8 ST a U d 9 S V DEFLECTION 2 38 2 2 1C401 STV9302A NC Ir sls E x501 2 R139 ST lt Ne 4 7k 4 mwen H als R407 401 3 R143 4 5 VD 409 lt 12k R251 acc H agotun e gt 4 5 ee Sl l a 07 R405 R402 lt ka DD Da pos 2 7k 2 2k Z el lel 470 om 3 VD105 R142 Q 912 INSI 7 LG bu NN C124 Z J a H H C404 C405 520 Dd man P SSC voz04 Y L a SUS A le a R408 nZ 1N4148 tk 1N4148 S 213 gt 1 R TU101 R141 G il 3om T501 PET 21 07 S 16 VD502 E 680 om RGP15J gt a L502 gt C328 HL105UH VD301 C301 c304 vD302 R307 470 0 0803 A ll 1N4007 an ok T301 8 0406 470 0 680p 1N4007 BCK 35 0218 si L yo504 R503 1001
9. IVZKR TXT COLOUR TELEVISION RECEIVER SERVICE MANUAL SECIFICATION SYSTEM POWER INPUT POWER CONSUMPTION AERIAL IMPEDANCE TUNER RECEIVING CHANNELS PROGRAMME PICTURE TUBE SOUND OUTPUT SPEAKER AV JACKS PAL SECAM BG DK I AC 170 245 50 60Hz 65W 75 OHM UNBALANCED FREQUENCY SYNTHESIZER TUNING VHF L E2 S6 VHF H 57 541 UHF E21 EG9 MAX 100 PROGRAM MEMORIES 14 15 20 21 90 2 0W 3W 80HM FULL SCART X 1 CAUTION Before servicing the chassis read the Safely Precaution X Ray radiation Precaution and Product Safety Notice in this manual X RAY RADIATION PRECAUTION 1 Excessive high voltage can produce potentially hazardous X RAY RADIATION To Avoid such hazards the high voltage must be specified limit The normal value of the high voltage of this receiver is 24 5KV 2KV under 230V AC power source The high voltage must not exceed 27KV 2 Each time a receiver requires servicing the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual It is recommended the reading of the high voltage be recorded as a part of the service record It is important to use an accurate and reliable high voltage meter 3 The primary source of X RAY RADIATION in this TV receiver is the picture tube For continued X RAY RADIATION protection the replacement tube must be exactly the same type tube as used in this TV rece
10. cters Scrolling of display region Variable flash rate controlled by software Enhanced display features including overlining underlining and italics Soft colours using CLUT with 4096 colour palette Globally selectable scanlines per row 9 10 13 16 and character matrix 12x10 12x13 12x16 VxH J Fringing Shadow selectable from N S E W direction Fringe colour selectable Meshing of defined area Contrast reduction of defined area e Cursor e Special Graphics Characters with two planes allowing our colours per character e 32 software redefinable On Screen display characters e 4 WST Character sets G0 G2 in single device e g Latin Cyrillic Greek Arabic e G1 Mosaic graphics Limited G3 Line drawing characters e WST Character sets and Closed Caption Character set in single device PINNING SYMBOL PIN DESCRIPTION P1 3 T1 1 port 1 3 or Counter Timer 1 input P1 6 SCL 2 port 1 6 or 12C bus clock line P1 7 SDA 3 port 1 7 or I2C bus data line P2 0 TPWM 4 port 2 0 or Tuning PWM output P3 0 ADC0 5 port 3 0 or ADC0 input P3 1 ADC1 6 port 3 1 or ADC1 input P3 2 ADC2 7 port 3 2 or ADC2 input P3 3 ADC3 8 port 3 3 or ADC3 input VSSC P 9 digital ground for u Controller core and periphery P0 5 10 port 0 5 8 mA current sinking capability for direct drive of LEDs P0 6 11 port 0 6 8 mA current sinking capability for direct drive of
11. for individual enable disable with two level priority e Two 16 bit Timer Counter registers e One 16 bit Timer with 8 bit Pre scaler e WatchDog timer e Auxiliary RAM page pointer e 16 bit Data pointer e Stand by Idle and Power Down PD mode e 14 bits PWM for Voltage Synthesis Tuning e 8 bit A D converter e 4 pins which can be programmed as general I O pin ADC input or PWM 6 bit output Data Capture e Text memory for 0 1 or 10 pages e In the 10 page versions inventory of transmitted Teletext pages stored in the Transmitted Page Table TPT and Subtitle Page Table SPT e Data Capture for US Closed Caption e Data Capture for 525 625 line WST VPS PDC system A and Wide Screen Signalling WSS bit decoding e Automatic selection between 525 WST 625 WST e Automatic selection between 625 WST VPS on line 16 of VBI e Real time capture and decoding for WST Teletext in Hardware to enable optimized processor throughput e Automatic detection of FASTEXT transmission e Real time packet 26 engine in Hardware for processing accented G2 and G3 characters e Signal quality detector for video and WST VPS data types e Comprehensive teletext language coverage e Full Field and Vertical Blanking Interval VBI data capture of WST data Display e Teletext and Enhanced OSD modes e Features of level 1 5 WST and US Close Caption Serial and Parallel Display Attributes Single Double Quadruple Width and Height for chara
12. ground A2 Connected to ground A3 Serial data input output SDA Serial clock input SCL Write protection Pin WP Connected to Vcc Protection valid Connected to Ground Protection invalid 8 Power Supply Vcc s oo A on 74HC4053 The 74HC HCT4083 are high speed Si gate CMOS devices and are pin compatible with the 4053 of the 4000B series They are specified in compliance with JEDEC standard no 7A The 74HC HCT4053 are triple 2 channel analog multiplexers demultiplexers with a common enable input E Each multiplexer demultiplexer has two independent inputs outputs nYo and nY4 a common input output nZ and three digital select inputs S4 to S3 With LOW one of the two switches is selected low impedance ON state by S4 to S3 With E HIGH all switches are in the high impedance OFF state independent of S4 to Sa Vcc and GND are the supply voltage pins for the digital control inputs S4 to 3 and The Vcc to GND ranges are 2 0 to 10 0 V for HC and 4 5 to 5 5 V for HCT The analog inputs outputs n Yo and nY 1 and nZ can swing between Vcc as a positive limit and Vee as a negative limit Vcc Vee may not exceed 10 0 V For operation as a digital multiplexer demultiplexer Vee is connected to GND typically ground 11 Features e Low ON resistance 800 typ at Vec Vee 4 5 V 700 typ at Vec Vee 6 0 V 600 typ at Vec Vee 9 0 V Logic level translation to enable 5 V logic to communicate w
13. ith 5V analog signals Typical break before make built in Output capability non standard PINNING PIN SYMBOL NAME AND FUNCTION 2 1 2Yo to 2Y1 independent inputs outputs 5 3 3Yo to 3Y y independent inputs outputs 6 E enable input active LOW 7 VEE negative supply voltage 8 GND ground 0 V 11 10 9 S4 to S3 select inputs 12 13 1Yo independent inputs outputs 14 15 4 1Z to 3Z common inputs outputs 16 Vcc positive supply voltage UC3842 The UC3842 provides all the essential features necessary to the operation of the basic current mode controller PINNING 1 Error amplifier output Error amplifier inverting input Current sense comparator Timing network Rr Cr Device ground Switching drive output Device supply voltage input Voltage reference 5 0V CT OO a 12 CRT1 GZS10 2 104
14. iver 4 Some parts in this receiver have special safety related characteristics for X RAY RADIATION protection For continued safety parts replacement should be undertaken only after referring the PRODUCT SAFETY NOTICE below SAFETY PRECAUTION WARNING Service should not be attempted by anyone unfamiliar with the necessary Precautions on this receiver The following are the necessary precautions to be observed before servicing this chassis 1 Since the power supply circuit of this receiver is directly connected to the AC power line An isolation transformer should be used during any dynamic service to avoid possible shock hazard 2 Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube The picture tube is highly evacuated and if broken glass fragments will be violently expelled Use shatterproof goggles and keep picture tube away from the unprotected body while handling 3 When replacing a chassis in the cabinet always be certain that all the protective devices are put back in place such as nonmetallic control knobs insulating covers shields isolation resistor capacitor network etc 4 When replacing parts or circuit boards disconnect the power cord 5 When replacing a high voltage resistor metal oxide resistor on circuit hoard keep the resistor APP 10mm 122 in away from circuit board 6 Connection wires must be kept away from components with high voltage or high temperatu
15. nd positive negative overshoot ratio and black stretching e Integrated chroma band pass filter with switchable centre frequency e Only one reference 12 MHz crystal required for the u Controller Teletext and the colour decoder e PAL NTSC or multi standard colour decoder with automatic search system e Internal base band delay line e RGB control circuit with Continuous Cathode Calibration white point and black level offset adjustment so that the colour temperature of the dark and the light parts of the screen can be chosen independently e Linear RGB or YUV input with fast blanking for external RGB YUV sources The Text OSD signals are internally supplied from the u Controller Teletext decoder e Contrast reduction possibility during mixed mode of OSD and Text signals e Horizontal synchronization with two control loops and alignment free horizontal oscillator e Vertical count down circuit e Vertical driver optimized for DC coupled vertical output stages e Horizontal and vertical geometry processing e Horizontal and vertical zoom function for 16 9 applications e Horizontal parallelogram and bow correction for large screen picture tubes e Low power start up of the horizontal drive circuit u Controller e 80C51 controller core standard instruction set and timing e 1us machine cycle e 32 128Kx8 bit late programmed ROM e 3 12Kx8 bit Auxiliary RAM shared with Display and Acquisition e Interrupt controller
16. pply Voltage Flyback Generator Ground Or Negative Supply Output Output Stage Supply Input Non Inverting NOah N TDA7056A The TDA7056A is a mono BTL output amplifier with DC volume control It is designed for use in TV and monitors but also suitable for battery fed portable recorders and radios Features e DC volume control e Few external components e Mute mode e Thermal Protection e Short circuit proof e No switch on and off clicks e Good overall stability e Low power consumption e Low HF radiation e ESD protected on all pins PINNING 1 Not connected n c Positive supply voltage Vp Voltage input Vi Signal ground GND1 DC volume control VC Positive output OUT Power ground GND2 Negative output OUT Not connected n c NG P N 10 24C08W6 The M24C08W6 is a series of 2 wire low power 8Kbit EEPROM with a wide operating range It is organized as 1K word X 8 bit It is capable of page write and sequential read Features e Two Wire I2C Serial Interface Supports 400kHz Protocol e Single Supply Voltage 2 5V to 5 5V e Write Control Input e BYTE and PAGE WRITE up to 16 Bytes e RANDOM and SEQUENTIAL READ Modes e Self Timed Programming Cycle e Automatic Address Incrementing e Enhanced ESD Latch Up Behavior e More than 1 Million Erase Write Cycles e More than 40 Year Data Retention PINNING 1 Connected to ground AO Connected to ground A1 Connected to
17. re 7 If any fuse in this TV receiver is blown replace it with the FUSE specified in the chassis parts list 8 The receiver is designed to operate with 230V 50Hz AC mains PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety related characteristics are often passed unnoticed by a visual inspection and the X RAY RADIATON protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock fire X RAY RADIATION or other hazards GENERAL ADJUSTMENT AUTOMATIC DEGAUSSING An automatic degaussing coil is attached around the picture tube degaussing the tube properly in about one second after the set is switched on If the receiver is moved or faced on a different direction the power must be switched off at least 15 minutes in order that the automatic degaussing circuit operated properly External degaussing is necessary if the automatic degassing proves ineffective after the set is moved B ADJUSTMENT CAUTION To avoid X ray hazards and result in a nominal display width B voltage must be set in the scale of 110 0V 0 5V 1 Make sure the AC power supply is 230V 50Hz Switch on the TV receiver tune in an active channel Measure the voltage between C318 on Main P C Board by DC voltmeter Set contrast brigh
18. rol bits Function Value Notes HS Horizontal Shift 31 VHS Vertical Shift 30 VA Vertical Amplitude 30 VAZ Vertical expand zoom 1 VX VS Vertical Slope 33 5 S Correction 22 CL Cathode drive Level 7 50 95 Volt drive Y Y Delay 7 IFO IF PLL Offset adjusment 32 Vg2 Screen Voltage Alignment mode OK Screen VR on the FBT e O ra BLOR Black level off set R 32 BLOG Black level off set G 32 R White point R 32 G White point G 32 B White point B 32 AGC AGC Take Over Point 35 TOP BCF Black Current loop Failure 0 OSO Overscan Switch Off 1 AGN Sound pre amplifier 6 db 1 Gain FM demodulator IE2 RGB Insertion Enable 1 ACL Automatic Colour Limiting 1 For special conditions descramblers with FSL forced vertical slicing level Oa et a s ns a conditions by setting FSL 1 BKS BlacK Stretch 1 IFO IF frequency selection 0 IF AGCs AGC time constant 0 IF AGC speed FFI Fast filter IF PLL 0 AV2 AV2 inbut enabled 1 SVID SVID input enabled 0 PF Peaking centre frequency 1 RPO RATIO PRE OVERSHOOT 3 TSM Limit between VHF1 VHF3 157 TSH Limit between VHF3 UHF 443 TBL Code for band VHF 1 01 TBM Code for band VHF 3 02 TBH Code for band UHF 04 DELAY Delay time for tuner 32 STEP 0 50 kHz 1 62 5 kHz 0 HOTEL Hotel mode anabled 0 LOCAL 6 3buttons keyboard swich BRT Brightness control in service mode 32 CONTR Contrast
19. tness color to maximum Adjust RP301 on Main P C Board for B 110 0V 0 5V voltage reading ak Go HIGH VOLTAGE CHECK CAUTION There is no high voltage adjustment in this chassis B 110V voltage directly relates to the high voltage The high voltage does not exceed 27KV under any conditions 1 Connect an accurate high voltage meter to the second anode cap of the picture tube 2 Turn on the receiver set brightness and contrast to minimum Zero beam current 3 Make sure the high voltage does not exceed 27KV 4 NO matter whether the luminance contrast and chrominance controls are set to maximum or minimum the high voltage must be kept under 27KV FOCUSING Receive a TV test pattern signal adjust controls for optimum picture Adjust Focus Control for a well defined sharpest display in the center area of the screen ADJUSTMENT AND SERVICING THE CHASSIS SERVICE MODE To enter the service mode short service mode points on PCB X202 pins 182 or press from ST BY mode STATUS gt MENU gt MUTE gt ST BY on RC TV will display service menu as following table 1 line by line To select the parameter by using the P P keys To adjust the selected parameter by using the V V keys To quit the service mode press the TV key on remote control when in the service mode W SERVICE MODE enter to short service mode points or press from ST BY mode STATUS gt MENU gt MUTE gt ST BY Cont
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