color television service manual model no. pf21gb300
Contents
1. u 0 N Jo o 8 C zt noc O E pH q 5 N P 3 i 5 C U U n U C pH ge nl a y g c U 5 ri v in 58 digo o mc Q eo 5 EJ C H uUi C N Ge SLIL b enl U U B 3 s LL PUA AT C e ae y d Bo Oo 5 K lg 14 oP Od Be E a Q n C zm 31IHM 20 HO o y gt Q Z TT 02 DE 4 Se 3 C D s So D Cp LV SH p U pions Q 0 5 M e D D 0 0 O0 wv a m 8 C ap 8 C Dp sc H bu ao n eO Ge H t U CO fg Ho ord rd omn vE yxy H O a oc Oy a gh En a c ale gll l n E E gt Q e o 00 E cou c p 8 4 Agi 4 pee E A Lond c n 115 Ozer 5 00 9 D 5 o u C E o a gi cnt J 0 ze Be 0 0 5 55 a Og 340 p co C m c I0 Z Z Or m zc 5 S12 C 0 DOA PES SE 54 5 voy a sc L 34 oW ie vos 1 0 ct o o k Q QO D 5E E 0 aoc a 4 00 0 2 lt a 5 uz g I 6 U m zb QOE QQE S3 Y E VOCE SCE SOCH R2. OMAI T29 g pa Sree E van T OZF a on i no TAG m bi i midiyse 3n0 A R a 7 bred bred Y Wad dOOQLL n8 v ED E IA ABS 8 q SS amp a STENT T Db oe 62a 6 a8 Bs 8 2 H g fo 94 R 1E rem p 4 aS 2 8 Ves a e s gt g S 8 gt gt gt eS 38 n um 5 of af gt fe sfs 2 2 Q af x a NOLVAGEX 85 SR ae ae mn 8 3 2 9 85 5 5 8 gt k 5 L 9 9 R 4 RO t i E I 6 La 4 xj S 5 5 gy 5 5 5 an ER E a 5 ous E mA E 5 E 3 gS uy 232 ai uo ay WE Q3 ad ot I a EZ andes af Assis ah Aeets zn zu at A pus 3 m Bu og 85 ws 09 O8 Os OG os gu Sa E Br ap B Bm B B o Q h amp Es 48 55 nee 1 1 t 88 bay E 3 a a yy R gh R ES JR tall ux a alf aq xa gx zd Jke ip af ime tto amo Rino EET 4 2 5 AR a amp E s YE M E 38 A kaq k FE 8 ad RD ol E R M k IF S hi c 8 gr Dil A 088EOSDI B o 4 3 E 4 gt J eu T2 TOA p K m D g e SEP EN z z n e 8 E 3 Gee DH 3 a 5 gS ore I d 85 g el a 8 B 88 ue Se EB RS ST 5 E gE dpe Gees IE mz T oce og al T a3 rod a 8 dag l8 E Do n gu BB p x Sd nOTASTX Ds 1 e 4 Bid x poH aa cred
3. 8 E a is only for reference Specifications are subject to change without notice This circuit diagram
4. 5 Sync 4 3 9 2 GND 1 1 Drain K BOARD TO KZ BOARD page Total REEANTH L page The VAM TRAP TNC DIAG CUIT NE AWTS DESIGNER AUDITOR TECHNOLOGIST NORMAL IZER HATIFIER
5. vertical amplitude and focus Face the TV set north or south Connect the power plug into the wall outlet and turn on the main power switch of the TV set Operate the TV for at least 15 minutes Degauss the TV set using a specific degaussing coil Set the brightness and contrast to maximum Counter clockwise rotate the R B low brightness potentiometers to the end and rotate the green low brightness potentiometer to center Receive green raster pattern signals Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward to display a vertical green zone on the screen Rotate and spread the tabs of the purity magnet around the neck of the CRT until the green zone is located vertically at the center of the screen Slowly move the deflection yoke assembly forward or backward until a uniform green screen is obtained Tighten the clamp screw of the assembly temporarily Check purity of the red raster and blue raster until purities of the three rasters meet the requirement DUMMY WEDGE DEFLECTION COIL ADHESIVE PURITY CONVERGENCE DEFLECTION MAGNET MODULE GLASS CLOTH t TAPES 2 1 2 Convergence Adjustment Preparation Before attempting any convergence adjustment the TV should be operated for at least 15 minutes Center convergence adjustment Receive dot pattern Adjust the brightness contrast controls to obtain a sharp picture Adjust two tabs of the 4 pole magnet to c
6. 2 2 Confirmation and Adjustment for Voltage Caution B voltage has close relation to high voltage To prevent X ray radiation set B voltage to the rated value The maximal radiator is not GND by reason of linking to TP 12V Make sure that the supply voltage is within the range of the rated value Connect a digital voltmeter to the voltage output terminal of the main PCB Power on the TV and set the brightness and sub brightness to minimum Ensure that the voltage from the main PCB reads as follows Regulate voltage adjustment components on the power section until the B the voltage reaches the rated value Test Point Voltage Voltage Voltage 21SS 21US Others TP 310V 311 1 5V 311 5V 311 5V TP 103V 104 1 5V 104 1 5V 115 1 5V TP 184V 184 1 3V 184 3V 184 3V TP 12V 13 1V 16 1V 13 1V TP 12V 13 1V 16 1V 13 1V TP 22V 22 1V 22 1V 22 1V TP 35V 35 1V 35 1V 35 1V TP 36V 36 1V 36 1V 36 1V TP 5V 1 5 03V 5 03V 5 0 3V TP 8V 8 1 0 3V 8 E 0 3V 8 E 0 3V TP 5V 2V 5 03V 5 03V 5 0 3V TP 3 3V 3 3 0 3V 3 3 1 0 3V 3 3 0 3V Note It s impossible to check the power part separately from the main chassis board as the part is mounted on the main chassis board The power components etc should be checked for burnout when power on If burned out do not power on the TV again until the cause is found o
7. EEPROM Internally organized with 64 pages of 16 bytes each the 16K requires a 10 bit data word address for random word addressing 4 4 4 Block Diagram Voc GND WP SCL SDA SERIAL CONTROL LOGIC COMP DEVICE ADDRESS COMPARATOR Ay DATA makers Ay makers H V PUMP TIMING DATA RECOVERY hi 2 a E PROM SERIAL MUX Doy1 ACK LOGIC 18 4 5 SWITCH MODE POWER SUPPLY IC FSCQ0765RT Internal Block Diagram Pin Number Pin Name Pin Function Description High voltage power SenseFET drain connection This pin is the control ground and the SenseFET source his pin is the positive supply input This pin provides internal perating current for both start up and steady state operation his pin is internally connected to the inverting input of the PWM omparator The collector of an opto coupler is typically tied to this nd GND If the voltage of this pin reaches 7 5V the over load protection riggers which results in the FPS shutting down his pin is internally connected to the sync detect comparator for asi resonant switching In normal quasi resonant operation the hreshold of the sync comparator is 4 6V 2 6V Whereas the sync threshold is changed to 3 0V 1 8V in an extended quasi resonant operation T T e pin For stable operation a capacitor should be placed between this pin a t T q t p 4
8. S Correction 32 24 VSL Vertical Slope 32 31 Page 3 G 2 ZOOM 16 Vertical zoom 16 9 0 ZOOMN Vertical zoom normal 4 3 25 ZOOM Vertical zoom expand zoom EX 51 OSD V5 50Hz OSD VERTICAL SHIFT 50 OSD V6 60Hz OSD VERTICAL SHIFT 46 Fac Factory Bus open 0 Init EEPROM init 0 Page 4 W tone BLOC Common course black level offset 7 BLOR Fine black level offset R 32 BLOG Fine black level offset G 32 BLOB Fine black level offset B 32 WPR White point R 32 WPG White point G 32 WPB White point B 32 Page 5 Tuning IF IF selection 3 TOP 20 AGCS IF AGC SPEED 1 OIF Off set if demodulatour 32 T SET TXT H POS 10 TXT RGB 15 Page 6 SYS NTSC 1 SECAM 1 BG A2 0 M 1 L 0 O SYS 0 DK 1 BG A2 2 BG 3 1 4 M 5 L 2 O LANG Prepare to place OSD Language 1 Page 7 MENU AVLE AVL EW function select 0 AVL AVL function 0 DEG DEGAUSS 0 B TRE Sound effect 0 DISG Gain selection of DISCO 0 COF Cut off control range 0 DCXO Crystal Frequency Correcting Compensation 2 Page 8 OTHER S VIDEO S VIDEO Set 0 M ON Memory on 1 OFF TIM Auot off without signal 0 E 0 5 Minutes 1 10 Minutes 2 15Minutes LOGO A User s logo setup 1 CT NO SIG Have no signal to hint 1 LOGO Logo color 0 1 LOGI Logo color 1 6 Page 9 SUB S BRI Sub bright 0 M BRI Max bright 63 S CON Sub contrast 0 M CON Max contrast 63 MX COL Max color 63 LOG T LOGO Sellection 0 VX VAM 0 Page 10
9. Video 0 PWLDAC 15 COR DEF Noise Reducing 1 SSL Slicing level 0 FSL Forced slicing level for vertical sync 0 AAS Black area to switch off the black stretch 2 XDT X ray detection 0 Page 11 Audio 0 AMLOW Audio output signal for AM sound AM 0 GSSIF Extra gain range SSIF for AM demodulation 0 DSG Gain from audio inputs to audio outputs 0 AGN Gain FM demodulator 0 AGNE Extended gain settings for FM demodulator 1 Page 12 Audio 1 T mod EHT Compensation Set 1 FMWS Window select for FM demodulator 1 BPB2 Bypass sound bandpass filter section 2 1 FFI Fast filter IF PLL 1 Page 13 Video 1 CL Cathode drive level 12 SOC Soft clipping level 2 PAL NTSC ident sensitivity burst amplitude at strong CHSE 2 signal typical value CLO Centre frequency of cloche filter 1 HBL 1 WBF 0 WBR 8 Notes The data sheet may differ dependent on different models The data sheet may differ dependent on different CRTs for the same model STRUCTURE AND CHISSIS FUNCTION DESCRIPION 10 3 1 STRUCTUE BLOCK DIAGRAM Video Amplifier UOC TOP Audio Amplifier TUNER Power Supply Circuit Side AVIN RCA SCART 3 2 CHASSIS DESCRIPTION 3 2 1 General Description ETE 3 chassis is applied in SS21GG300A seriers By use of Philips UOC TOP for TV small signal processing and bus control the chassis enables TV tuning adjustment control and picture correction f
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11. 5 SERVICE mode To enter the SERVICE mode Set the volume to 0 Then press and hold the MUTE button on the remote control and press the MENU button on the TV to enter the SERVICE mode To exit from the SERVICE mode turn off the TV set by the POWER button on the remote control Caution The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing As the control data have dramatic effects on functions and performance of the TV service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings Adjustments and bus data Symbol Description Data Page 0 The OTP Software NO Displayed As GDET03 V Bri Pic Brightness Displayed 32 VSD Vertical Scan Disable 32 Page 1 G 0 When Vertical Frequency is Identified as 50Hz Then 50Hz will be displayed so is 60Hz HSH Horizental Shift 32 38 HPAR Horizental Parallelogram Correction 26 28 HBOW Horizental BOW Correction 32 32 VLIN Vertical Linearity 32 32 VSCR Vertical Scroll 32 32 EWW E W Width 53 51 PW E W Parabola Width 22 18 Page 3 G 2 UCP E W Upper Corner Parabola 46 37 LCP E W Bottom Corner Parabola 42 33 TC E W Trapezium 32 32 VSH Vertical Shift 36 36 VA Vertical Amplitude 22 22 SC Vertical
12. 9843 B J TFA9842 B J and TFA9841J The difference between the TFA9843AJ and the TFA9843 B J TFA9842 B J TFA9841J is the functionality of pin 7 The TFA9843AJ has a Volume Control VC on pin 7 The TFA9843 B J TFA9842 B J and TFA9841J have a mode select Mode on pin 7 The TFA9842AJ contains a unique protection circuit that is solely based on multiple temperature measurements inside the chip This gives maximum output power for all supply voltages and load conditions with no unnecessary audio holes Almost any supply voltage and load impedance combination can be made as long as thermal boundary conditions number of channels used external heatsink and ambient temperature allow it 14 4 2 2 Features 2 Channel SE 1 W to 7 5 W operation possibility Soft clipping Input clamps Volume control Standby and mute mode No on off switching plops Low standby current High supply voltage ripple rejection Outputs short circuit protected to ground supply and across the load Thermally protected Pin compatible with the TFA9843AJ TFA9843 B J TFA9842 B J TFA9841J 4 2 3 Block diagram of TFA9842AJ IN 1 60 kQ 2 60 KQ SHORT CIRCUIT CIV AND TEMPERATURE PROTECTION vc 4 2 4 Pining 15 TFA9842AJ MDBO024 4 2 3 Pin Description Symbol Pin Description IN2 1 input 2 OUT2 2 loudspeaker terminal 2 CIV 3 common input voltage decoupling IN 1 4 input 1 GND 5 ground SVR 6 half supply voltage decou
13. COLOR TELEVISION SERVICE MANUAL MODEL NO PF21GB300 CHASSIS NO ETE3 Please read this manual carefully before service 1 SAFETY INSTRUCTIONS AND MAINTENANCE WARNING BEFORE SERVICING THIS CHASSIS READ THE X RAY RADIATION PRECAUTION SAFETY PRECAUTION AND PRODUCT SAFETY NOTICE INSTRUCTION BELOW 1 1 X RAY RADIATION PRECAUTION 1 1 1 The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X ray radiation as result of excessive EHT voltage The maximum EHT voltage permissible in any operating circumstances must not exceed the rated value When checking the EHT use the High Voltage Check procedure in this manual using an accurate EHT voltmeter 1 1 2 The only source of X RAY radiation in this TV is the CRT The TV minimizes X RAY radiation which ensures safety during normal operation To prevent X ray radiation the replacement CRT must be identical to the original fitted as specified in the parts list 1 1 3 Some components used in this TV have safety related characteristics preventing the CRT from emitting X ray radiation For continued safety replacement component should be made after referring the PRODUCT SAFETY NOTICE below 1 1 4 Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT anode So ensure that the maximum EHT voltage does not exceed the rated value after service and adjustment 1 2 SAFETY PRECAUTION WARNING REFER SERVICING TO QUALIFIED SERVICE PER
14. INES PURITY MAGNET CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS Fig 2 4 pole Magnet Movement 6 pole Magnet Movement Incline the Yoke Up or Down Incline the Yoke Right or Left Circumference Convergence by DEF Yoke Fig 3 2 1 3 White Balance Adjustment Generally white balance adjustment is made with professional equipment It s not practical to get good white balance only through manual adjustment For TVs with I2C bus control change the bus data to adjust white balance 2 2 CIRCUIT ADJUSTMENTS Preparation Circuit adjustments should be made only after completion of set up adjustments Circuit adjustments can be performed using the adjustable components inside the TV set For TVs with 2 I C bus control first change the bus data 2 2 1 Degaussing A degaussing coil is built inside the TV set Each time the TV is powered on the degaussing coil will automatically degauss the TV If the TV is magnetized by external strong magnetic field causing color spot on the screen use a specific degausser to demagnetize the TV in the following ways Otherwise color distortion will be shown on the screen Power on the TV set and operate it for at least 15 minutes Receive red full field pattern Power on the specific degausser and face it to the TV screen Turn on the degausser Slowly move it around the screen and slowly take it away from the TV Repeat the above steps until the TV is degaussed completely 2
15. NEE e UCM Wow f T 8 85 c BI oi E senesan AS 92 Q OELXH 2067 a Sahat E TT eet BPTENT eer FN 3nog vas Ted VA T z vas TE TE TIOE ZOEN E ER i i gt aoe nag z 1 1 E b TTOEWGL o f n E 9 oes OW 000 0 Edy B oo g vera T0E1 5 p 8 d F yno Y ox SecH n 2158 za f gs x ay eray TWMd T0v g ex SE 5 58 Ting Dam Q7 3wAus 24 S8 28 m d 2WNd ZOQV 2 ores n I Seed Pa ib SEN Le asney lA A uc AS x Iz oce TV TINL 0 Td EWMA EIOV E Ed Hr l N t t SE OINI S 0d sasha 0001 AUT SAS it z d 5 Eas lum post 4 ve 9250M Ko ope E000 Wh q 7 aa 2 oy Oc 2220 SH old ecc Std a 3 save ano wax i S zik 8 AOT Ww T ZHiS 8 5l i8 n z OEE 5 Sec Toza ora z aranaz E 38 E NOLASTX i ia S Y S I d 4 Tego E nezo on gu p E EVOOA TdA 4l ab A 6 sto 4 see meno da E ur C P gerose OOT wg TEE ANT Se R A88 Peed doOZr L TOEH S05 4 Ma 06 eara NNI 4 L or ch A Srerose OOT doogg ma XT ll fe 3 Eis EXE ETH Z 2729 E 3 Ino p lm op ne TONS A 8 2082 4 Es T A Stevase Em TOPA ae 3nog POZA 8 i NDE Toss if 4 55 ae i l R iy n g
16. PBPR signals Tint control for external RGB YPgPg signals Integrated chroma band pass filter with switchable centre frequency 1 Only one reference 12 MHz crystal required for the Controller Teletext and the colour decoder Multi standard colour decoder with automatic search system Internal base band delay line Indication of the Signal to Noise ratio of the incoming CVBS signal A linear RGB YUV YPBPR input with fast blanking for external RGB YUV sources The synchronisation circuit can be connected to the incoming Y signal The Text OSD signals are internally supplied from the Controller Teletext decoder 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 light parts of the screen can be chosen independently 2 levels of contrast reduction of main picture possible during OSD Text insertion halftone OSD Text gain reduction control Adjustable wide blanking of the RGB outputs Horizontal synchronization with two control loops and alignment free horizontal oscillator Vertical count down circuit Vertical driver optimized for DC coupled vertical output stages Horizontal and vertical geometry processing Horizontal and vertical zoom function for 16 9 applications Horizontal parallelogram and bow correction for large screen picture tubes Low power start up of the horizontal drive c
17. Replace blown fuses within the TV with the fuse specified in the parts list 1 2 8 When replacing wires or components to terminals or tags wind the leads around the terminal before soldering When replacing safety components identified by the international hazard symbols on the circuit diagram and parts list it must be the company approved type and must be mounted as the original 1 2 9 Keep wires away from high temperature components 1 3 PRODUCT SAFETY NOTICE CAUTION FOR YOUR PROTECTION FOLLOWING PRODUCT SAFETY NOTICE SHOULD BE READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET 1 3 1 Many electrical and mechanical components in this chassis have special safety related characteristics These characteristics are often passed unnoticed by a visual inspection and the X ray radiation protection afforded by them cannot necessarily be obtained by using replacements rated at higher voltages or wattage etc Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols on the circuit diagram and parts list Before replacing any of these components read the parts list in this manual carefully Substitute replacement components which do not have the same safety characteristics as specified in the parts list may create X ray radiation 1 3 2 Do not slap or beat the cabinet or CRT since this may result in fire or explosion 1 3 3 Never allow the TV sharing a plug
18. SONNEL ONLY 1 2 1 The TV has a nominal working EHT voltage Extreme caution should be exercised when working on the TV with the back removed Do not attempt to service this TV if you are not conversant with the precautions and procedures for working on high voltage equipment When handling or working on the CRT always discharge the anode to the TV chassis before removing the anode cap in case of electric shock The CRT if broken will violently expel glass fragments Use shatterproof goggles and take extreme care while handling Do not hold the CRT by the neck as this is a very dangerous practice 1 2 2 It is essential that to maintain the safety of the customer all power cord forms be replaced exactly as supplied from factory 1 2 3 Voltage exists between the hot and cold ground when the TV is in operation Install a suitable isolating transformer of beyond rated overall power when servicing or connecting any test equipment for the sake of safety 1 2 4 When replacing ICs use specific tools or a static proof electric iron with small power below 3 5W 1 2 5 Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to avoid electronic gun magnetized and decrement in convergence of the CRT 1 2 6 When remounting the TV chassis ensure that all guard devices such as nonmetal control buttons switch insulating sleeve shielding cover isolating resistors and capacitors are installed on the original place 1 2 7
19. age hardware write protection Additional protection EEPROM of 64 128 bits bit per data page 1 Protection setting for each data page by writing its protection bit Protection management without switching WP pin Low power CMOS Vccz2 7 to 5 5V operation Two wire serial interface bus IIC Bus compatible Filtered inputs for noise suppression with Schmitt trigger Clock frequency up to 400 kHz High programming flexibility Internal programming voltage Self timed programming cycle including erase Byte write and page write programming between 1 and 16 bytes 17 Typical programming time 6ms 1 Oms for up to 16 bytes High reliability Endurance 106 cycles 1 Data retention 40 years 1 ESD protection 4000 V on all pins 8 pin DIP DSO packages Available for extended temperature ranges 40to 85 40to 125 Industrial Automotive 4 4 2 Pin Description SERIAL CLOCK SCL The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device SERIAL DATA SDA The SDA pin is bi directional for serial d and may be wire ORed with any number of other open drain or open ata transfer This pin is open drain driven collector devices The AT24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be addressed on a single bus system The AO and pins are no connects 4 4 3 Memory Organization T24C16 16K SERIAL
20. e capture and decoding for WST Teletext in Hardware to enable optimized processor throughput Automatic detection of FASTEXT transmission Real time packet 26 engine in Hardware for processing accented G2 and G3 characters Signal quality detector for video and WST VPS data types Comprehensive teletext language coverage Full Field and Vertical Blanking Interval VBI data capture of WST data Display Up to 4 character sets with 256 characters each size 16 pixels x 18 lines Enhanced OSD modes 50Hz 60Hz display timing modes Serial and Parallel Display Attributes Single Double Quadruple Width and Height for characters 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 Global selectable matrix 12 16 Fringe colour selectable Contrast reduction of defined area Programmable Cursor Special Graphics Characters with two planes allowing four colours per character 4 2 TFA9842AJ 2 channel audio amplifier with volume control SE 1 W to 7 5 W 4 2 1 General description The TFA9842A contains two identical audio power amplifiers The TFA9842AJ can be used as two Single Ended SE channels with a volume control The maximum gain is 26 dB The TFA9842AJ comes in a 9 pin DIL bent SIL DBS9P power package The TFA9842AJ is pin compatible with the TFA9843AJ TFA
21. eaturing high integration high performance to price ratio and high reliability and compact circuit with fewer external components The chassis widely used in small and medium TVs provides much more convenience for manufacturing and technical service It includes UOC TDAI11136PS N3 3 for PAL NTSC SECAM small signal processing and bus control EEPROM AT24C16 for data memory TDA4864AJ for vertical output power amplifying TFA9842AJ for audio power amplifying Thick film IC FSCQ0765RT for power circuit adjustment and control 2 2 2 The following features are available in the chassis Color systems PAL SECAM OPT NTSC OPT Sound systems D K B G I M OPT 236 programs preset AV stereo Hotel Child lock Teletext OPT ZOOM Channel swap Recall Timer 11 3 2 3 The chassis mainly uses the following ICs and assemblies Position Type Description 1 N201 AT24C16 EERPOM 2 N202 TDAIIIXXPS Micro processor MONO 90 MONO110 Versions for 90 110 picture tubes TDA121XXPS Micro processor AV 90 AV 110 Versions for 90 110 picture tubes 3 N601 TFA9842AJ Audio power amplifier 4 N300 TDA4864AJ TDA4863AJ TDA4865AJ For Ultra slim CRT 5 N801 FSCQ0765 Switch mode power supply control 6 A001 TAF5 C4I23 IF 38MHz tuner TAF5 E4122 IF 38 9MHz tuner TAF5 U2F22 IF 45 75MHz tuner 3 SERVICE DATA 4 1 TV signal processor TDA111XX series 4 1 1 GENERAL DESCRIPTION The various versions o
22. f the TDA111XX TDA121XX series combine the functions of a video processor together with a Controller and US Closed Caption decoder Most versions have a Teletext decoder on board The Teletext decoder has an internal RAM memory for 1 page text The ICs are intended to be used in economy television receivers with 90and 110picture tubes The ICs have supply voltages of 8 V and 3 3 V and they are mounted in an SDIP 64 envelope The features are given in the following feature list 4 1 2 FEATURES TV processor Available in TDA111XX versions Multi standard vision IF circuit with alignment free PLL demodulator Internal switchable time constant for the IF AGC circuit The mono intercarrier sound circuit has 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 The FM PLL demodulator can be set to centre frequencies of 4 72 5 74 MHz so that a second sound channel can be demodulated In such an application it is necessary that an external band pass filter is inserted Integrated chrominance trap circuit Integrated luminance delay line with adjustable delay time Picture improvement features with peaking with switchable centre frequency depeaking variable positive negative overshoot ratio and video dependent coring and blue and black stretching All features are available for CVBS Y C and Y
23. hange the angle between them and red and blue vertical lines are superimposed each other on the center of the screen Turn both tabs at the same time keeping the angle constant to superimpose red and blue horizontal on the center of the screen Adjust two tabs of the 6 pole magnet to superimpose red blue line and green line Remember red and blue movement Repeat steps 2 1 3 2 1 5 until optimal convergence is obtained Circumference convergence adjustment Loosen the clamp screw holding the deflection yoke assembly and allow it tilting Temporarily put the first wedge between the picture tube and deflection yoke assembly Move front of the deflection yoke up or down to obtain better convergence in circumference Push the mounted wedge in to fix the yoke temporarily Put the second wedge into bottom Move front of the deflection yoke to the left or right to obtain better convergence in circumference Fix the deflection yoke position and put the third wedge in either upper space Fasten the deflection yoke assembly on the picture tube Detach the temporarily mounted wedge and put it in either upper space Fasten the deflection yoke assembly on the picture tube After fastening the three wedges recheck overall convergence and ensure to get optimal convergence Tighten the lamp screw holding the deflection yoke assembly 4 POLE MAGNETS ADJUST THE ANGLE FIXED ge SM i ROTATE TWO M AT THE SAME TIME HORIZONTAL L
24. ircuit Macrovision keying possibility for horizontal synchronisation Available in TDA111XX versions choice can be made between versions with mono intercarrier sound FM demodulator and versions with QSS IF amplifier Source selection between the internal CVBS and an external CVBS or Y C signal Controller e 80C51 controller core standard instruction set and timing e 0 9766 u s machine cycle maximum of 64 k x 8 bit late programmed ROM maximum of 3 k x 8 bit Auxiliary RAM 2 k required for Display 2C byte level bus interface Interrupt controller for individual enable disable with two level priority Two 16 bit Timer Counter registers One 24 bit Timer 16 bit timer with 8 bit Pre scaler 16 bit Data pointer WatchDog timer Auxiliary RAM page pointer Stand by Idle and Power Down modes Up to 13 general purpose I O pins 14 bits PWM for Voltage Synthesis Tuning 8 bit A D converter with 4 multiplexed inputs e 4 PWM 6 bits outputs for analogue control functions 13 Data Capture Text memory for 1 page Inventory of transmitted Teletext pages stored in the Transmitted Page Table TPT and Subtitle Page Table SPT Data Capture for US Closed Caption Data Capture for 525 625 line WST VPS PDC system A and 625 line Wide Screen Signalling WSS bit decoding Automatic selection between 525 WST 625 WST Automatic selection between 625 WST VPS on line 16 of VBI Real tim
25. ntally tipped over pushed off or pulled off Do not place the set near or over a radiator or heat register or where it is exposed to direct sunlight 1 5 2 Do not install the TV set in a place exposed to rain water excessive dust mechanical vibrations or impacts 1 5 3 Allow enough space at least 10cm between the TV and wall or enclosures for proper ventilation 1 5 4 Slots and openings in the cabinet should never be blocked by clothes or other objects 1 5 5 Please power off the TV set and disconnect it from the wall immediately if any abnormal condition are met such as bad smell belching smoke sparkling abnormal sound no picture sound raster Hold the plug firmly when disconnecting the power cord 1 5 6 Unplug the TV set from the wall outlet before cleaning or polishing it Use a dry soft cloth for cleaning the exterior of the TV set or CRT screen Do not use liquid cleaners or aerosol cleaners 2 ADJUSTMENTS 2 1 SET UP ADJUSTMENTS The following adjustments should be made when a complete realignment is required or a new picture tube is installed Perform the adjustments in the following order Color purity Convergence White balance Notes The purity convergence magnet assembly and rubber wedges need mechanical positioning For some picture tubes purity convergence adjustments are not required 2 1 1 Color Purity Adjustment Preparation Before starting this adjustment adjust the vertical sync horizontal sync
26. or socket with other large power equipment Doing so may result in too large load causing fire 1 3 4 Do not allow anything to rest on or roll over the power cord Protect the power cord from being walked on modified cut or pinched particularly at plugs 1 3 5 Do not place any objects especially heavy objects and lightings on top of the TV set Do not install the TV near any heat sources such as radiators heat registers stove or other apparatus that produce heat 1 3 6 Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and servicing of this TV set Otherwise the resulted damage is not protected by the manufacturer 1 4 SAFETY SYMBOL DESCRIPTION The lightning symbol in the triangle tells you that the voltage inside this product may be strong nough to cause an electric shock Extreme caution should be exercised when working on the TV with the back removed f This is an international hazard symbol telling you that the components identified by the symbol have special safety related characteristics UL This symbol tells you that the critical components identified by the UL marking have special safety related characteristics VDE or TUV This symbol tells you that the critical components identified by the VDE TUV marking have special safety related characteristics 1 5 MAINTENANCE 1 5 1 Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from being accide
27. pling ripple rejection 7 volume control input standby mute and volume control OUT1 8 loudspeaker terminal 1 VCC 9 supply voltage Symbol Pin Description 4 3 VERTICAL SCAN OUTPUT STAGE CIRCUIT TDA4864AJ 4 3 1 FEATURES TDA4864AJ Output current up to 2 5A p p 4 3 2 GENERAL DESCRIPTION The TDA4864AJ is deflection boosters for use in vertical deflection systems for frame frequencies up to 200 Hz The TDA4864AJ needs a separate flyback supply voltage so the supply voltages are independently adjustable to optimize power consumption and flyback time For the TA4864AJ the flyback supply voltage will be generated internally by doubling the supply voltage and therefore a separate flyback supply voltage is not needed 4 3 3 Block diagram of TDA4864AJ 16 THERMAL PROTECTION ii e VERTICAL NBACK REFERENCE innu OUTPUT GENERATOR CIRCUIT ue 2 n E from TDA489X ai RS rF 1 onam 4 3 4 pinning PIN SYMBOL DESCRIPTION 1 VPI positive supply voltage 1 2 VP3 flyback generator output 3 VP2 supply voltage 2 for vertical output 4 GND ground or negative supply voltage 5 V OUT vertical output 6 INN inverted input of differential input stage 7 INP non inverted input of differential input stage 4 4 EEPROM AT24C16 4 4 1 Features Data EEPROM internally organized as 1024 2048 bytes and 64 128 pagesx16 bytes Page protection mode flexible page by p
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29. ut 2 2 3 High Voltage Inspection Measure voltages of test points on the main PCB with the digital voltmeter Measure the CRT high voltage with the high voltage testing equipment and heater voltage with the high frequency effective voltmeter The rated values are shown as below Test Point Voltage Test Point Voltage Negative of VD49 1 18443V 14 GS_CRT_anode 22 1 5KV 21 FS CRT anode 25 5 1 5KV 21 PF CRT anode 26 541 5KV 2125 CRT anode 21 US CRT anode HUAFED 25 5 1 5KV SAMSUNGILG 23 54 1 5KV Heater 6 3x0 3Vrms 2 2 4 Lian grid focuse of the adjustment and white balance adjust Caution Dangerously high voltages are present inside the TV Extreme caution should be exercised when working on the TV with the back removed 1 Power on the TV and preheat it for 15 min 2 Pack P MODE key to work a television at the natural mode 3 Counterclockwise to adjust the Lian grid to the least 4 Press VSD key of factory remote control clockwise adjust the Lian grid adjust to the screen to at the right moment appear a horizon 5 Adjust parameter BLOR BLOG and BLOB under the horizon adjust the horizon as white Generally don t adjust BLOG 6 And then press VSD key again Adjust Lian grid make the horizon accommodation not dazzling white if it doesn t white repeated step until white 7 Regulate to focuse make the light grid focuse good and you get a sharp picture 2 2
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