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SERVICE MANUAL

Fig. 31

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Block Diagram

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Содержание 25D19MA

Страница 1: ...NO SM CTV O 142 COLOR TELEVISION SERVICE MANUAL MODEL NO 25D26MA 25D19MA PF25D19MA 29D18MA PF29D18MA 29D99MA PF29D99MA 34D18MA PF34D8MA CHASSIS NO CH 10DR Please read this manual carefully before ser...

Страница 2: ...SAFETY INSTRUCTIONS 1 ADJUSTMENTS 4 SYSTEM BLOCK DIAGRAMS AND ICS 13 SERVICE DATA 17 REPLACEMENT OF PARTS 50 APPENDIX 1 CIRCUIT DIAGRAMS 2 PRINTED CIRCUIT BOARD LAYOUTS 3 FINAL ASSEMBLY DIAGRAMS 4 FIN...

Страница 3: ...he CRT anode So ensure that the maximum EHT voltage does not exceed the rated value after service and adjustment SAFETY PRECAUTION WARNING REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY 1 The TV...

Страница 4: ...the power cord Protect the power cord from being walked on modified cut or pinched particularly at plugs 4 Do not place any objects especially heavy objects and lightings on top of the TV set Do not...

Страница 5: ...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 2 Do not install the TV set in a place exposed to rain water exce...

Страница 6: ...net using a degaussing coil 2 Set the brightness and contrast to maximum 3 Receive the green raster pattern 4 Loosen the clamp screw holding the deflection yoke and slide it backward or forward to dis...

Страница 7: ...g in complicating and dot movement Circumference convergence adjustment 1 Loosen the clamping screw of the defection yoke slightly to allow it to tilt 2 Temporarily put a wedge as shown in Fig 1 Do no...

Страница 8: ...ed BLU GRN Red BLU GRN BLU Red 4 pole Magnet Movement 6 pole Magnet Movement Center Convergence by Convergence Magnets Incline the Yoke Up or Down Incline the Yoke Right or Left Circumference Converge...

Страница 9: ...ts of the cabinet become magnetized to cause poor colour purity use an external degaussing coil Slowly move the degaussing coil around the screen the sides and front of the TV and slowly withdraw the...

Страница 10: ...trast to maximum and the brightness chroma to medium 2 Set H V lines near center of Philips pattern to thinnest with the FCB on the FBT After finishing adjustment ensure that no poor focusing exists n...

Страница 11: ...e adjusted data are immediately output and stored in the EEPROM Warning The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing As the co...

Страница 12: ...31 COL MID Color Mid 31 MENU 3 PAL NTSC V HALF Half vertical picture on off 0 V SLOPE Vertical shift 31 Set to optimum V AMPL Vertical amplitude 34 37 Set to optimum S CORR PAL vertical shift 26 Set t...

Страница 13: ...tching adjustment 16 For inspection only NONLINEARI Brightness linearity adjustment 32 For inspection only VAR GAMM Vertical non linearity adjustment 32 For inspection only PEAKING Peaking circuit 32...

Страница 14: ...once on the remote control until a right horizontal line appears on the screen Adjust the R DRV data to get 160V 0 5 green gun voltage across the CRT RGB PCB e Adjust the G DRV and B DRV data accordin...

Страница 15: ...SERVICE MANUAL SYSTEM BLOCK DIAGRAMS AND KEY ICS Block Diagram of Chassis 150 250V 50Hz Fig 4 Chassis Block Diagram 13...

Страница 16: ...SERVICE MANUAL Block Diagram of Supply Voltage System 150 250V 50Hz Fig 5 Block Diagram of Supply Voltage System 14...

Страница 17: ...SERVICE MANUAL Block Diagram of Remote Control Structure Fig 6 Block Diagram of Remote Control Structure 15...

Страница 18: ...l processor 4 N401 TDA8350Q Vertical output circuit 5 N601 TDA7057AQ Sound power amplifier 6 N606 TDA9859 Audio processor 7 N811 TDA4605 Power control circuit 8 NY01 TDA6108JF Video amplifier 9 NW01 T...

Страница 19: ...against open or a short of the control loop Switch off if line voltage is too low under voltage switch off Line voltage depending compensation of fold back point Fig 7 Soft start for quiet start up wi...

Страница 20: ...c timer BT with watchdog timer function One 8 bit timer counter T0 with interval timer One 8 bit general purpose timer counter TA with prescalers On screen display OSD with a wide range of programmabl...

Страница 21: ...enerator ROM 256 18 16 bits 256 display characters fixed 2 variable 254 252 display positions 12 rows 21 columns 16 dot 18 dot character resolution 16 different character sizes Eight character colors...

Страница 22: ...SERVICE MANUAL 2 Block Diagram Fig 9 Block Diagram 20...

Страница 23: ...SERVICE MANUAL 3 Pin Assignments Fig 10 Pin Assignment Diagram 21...

Страница 24: ...SERVICE MANUAL 4 Pin Descriptions Table 4 5 Refer to Table 13 about Functions and Ser s Pins vice Data of the IC 22...

Страница 25: ...n bit Protection management without switching WP pin Low power CMOS Vcc 2 7 to 5 5V operation Two wire serial compatible Filtered inputs for noise suppression with Schmitt trigger Clock frequency up t...

Страница 26: ...unt down circuit Vertical driver optimised for DC coupled vertical output stages I2 C bus control of various functions 2 General Description The various versions of the TDA884X 5X series are I2 C bus...

Страница 27: ...SERVICE MANUAL 3 Block Diagram ZW 45 EW GEOMETRY Fig 13 Block Diagram OM8839 S DIP 56 Envelope 5 Refer to Table 15 about Functions and Service Data of the IC s Pins 25...

Страница 28: ...due to common mode inputs Temperature thermal protection East West output stage with one single conversion resistor 2 General Description The TDA8350Q is a power circuit for use in 90 and 110 color d...

Страница 29: ...57AQ is a stereo BTL output amplifier with DC volume control The device is designed for use in TVs and monitors but is also suitable for battery fed portable recorders and radios Missing Current Limit...

Страница 30: ...a color Single supply voltage of 200 V CRT directly To obtain maximum performance Internal reference voltage of 2 5 V the amplifier should be used with black current Fixed gain of 51 for TDA6108JF or...

Страница 31: ...l switches are in the high impedance OFF state independent of A0 and A1 VDD and Vss are the supply voltage connections for the digital control inputs A0 A1 and E The VDD to Vss range is 3 to 15 V The...

Страница 32: ...ith the Absolute Maximum System IEC 134 Supply voltage with reference to VDD VEE 18 to 0 5 V Note To avoid drawing VDD current out of terminal Z when switch current flows into terminals Y the voltage...

Страница 33: ...d Y1 and the other side connected to a common input output Z With E LOW one of the two switches is selected all switches are in the high impedance OFF state independent of SA to SC VDD and VSS are the...

Страница 34: ...age L LOW state the less positive voltage X STATE is immaterial Fig 23 Schematic Diagram One Switch Ratings Limiting values in accordance with the Absolute Maximum System IEC 134 Supply voltage with r...

Страница 35: ...corders and radios The device is contained in a 9 pin medium power package A Missing Current Limiter MCL is built in The MCL circuit is activated when the difference in current between the output term...

Страница 36: ...mpatible with TA75558P TA75558S and TA75558F Possible to Exchange the Position of 9 Pin for 1 Pin Because of Pin Connection Being Symmetric TA75558S Device Only Wide Band Range fT 3MHz Typ Suitable Ap...

Страница 37: ...d decoder can be added externally Two general purpose logic output ports I2 C bus control of all functions 2 General Description The TDA9859 provides control facilities for the main and the SCART chan...

Страница 38: ...a picture As a result the contrast ratio of the most important parts of the scene will be improved Black restoration is available in the event of a set up in the luminance signal A variable gamma fun...

Страница 39: ...or interfacing three analog low frequency voltage signals e g ambient light control or beam current voltage level to the I2 C bus In the demonstration mode all the features selected by the user are au...

Страница 40: ...SERVICE MANUAL Fig 31 38 3 Block Diagram...

Страница 41: ...ce Data of S3P8849XZZ CH12T1007 N001A s Pins Digital Multimeter Pin No Function Description Reference Voltage V Positive Resistance 20K Negative Resistance 20K 1 VT 0 5 103 105 2 EMC 0 1500 1120 3 KAV...

Страница 42: ...3 6 Data line 4 94 6 89 5 15 7 PW write protect 4 94 9 58 6 31 8 Supply voltage 4 94 3 5 3 25 Negative Resistance 20K Table 15 Functions and Service Data of OM8839PS N301 s Pins Digital Multimeter Pin...

Страница 43: ...CAM demodulation 4 23 6 68 5 82 34 3 58MHz crystal oscillator 2 56 7 87 5 91 35 4 43MHz crystal oscillator 2 56 7 87 5 91 36 APC low pass filter 4 95 8 75 5 9 37 Horizontal starting supply voltage 8 2...

Страница 44: ...ncushion input negative 2 43 6 97 13 Pincushion input positive 2 91 6 88 Table 17 Functions and Service Data of TDA7057AQ N601 s Pins Digital Multimeter Pin No Function Description Reference Voltage V...

Страница 45: ...ut 69 18 5 45 9 G output 65 9 5 45 Table 19 Functions and Service Data of HEF4052 N602 s Pins Digital Multimeter Pin No Function Description Reference Voltage V Positive Resistance K Negative Resistan...

Страница 46: ...5 09 6 89 4 44 Table 21 Functions and Service Data of TD7056B NW01 s Pins Digital Multimeter Pin No Function Description Reference Voltage V Positive Resistance 20K Negative Resistance 20K 1 Not conne...

Страница 47: ...ne 4 33 7 02 5 25 17 Serial data line 4 53 6 98 5 21 18 Audio output 4 13 6 78 5 65 19 Treble compensation 4 14 7 48 6 24 20 Audio output 0 21 Bass2 compensation 4 15 7 59 6 04 22 Bass1 compensation 4...

Страница 48: ...Waveforms of Key ICs Note The TV receives NTSC color bar with 1KHz sine wave audio reception in Normal mode when measuring voltage and resistance with a GDM 8145 multimeter Max resistance 20 K Max DC...

Страница 49: ...SERVICE MANUAL 47...

Страница 50: ...SERVICE MANUAL 48...

Страница 51: ...SERVICE MANUAL N606 s Pin3 Pin5 Pin7 Pin9 and Pin10 N606 s Pin11 Pin12 Pin19 Pin21 and Pin22 N606 s Pin14 49...

Страница 52: ...diagram and parts list When replacing any of these components substitute the one which has the same safety characteristics as specified in the manual Description of the special markings A The componen...

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