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SERVICE MANUAL 

 

1

5

2. BLOCK DIAGRAM FOR SUPPLY VOLT-AGE SYSTEM

 

 

Regulator

V115

N441

N442

Regulator

V871,

VD882

FBT

T400

VD491

+190V

VD451

+45V

VD461

+16V

VD471

To  CRT RGB PCB

To A100,N401

To N401

+8V

+5V-2

To A100

VD891

+115V

To N600

VD881 +15V-H

VD871  +15-S

+5V-1

                  To   H Out
                         EEPROM
                         R/C Input

+3.3V

            To N100

              Keyboard

Switch

Transformer

T804

Power Regulat ion

and Control Circuit

STR-G5653/F6654

Bridge Rectifying

Filter

VD803~VD806

C802,C807

Line Filter

L801,C801,

C802

1

1

0-2

4

0V~,50

/60

Hz

Feedback Circuit

N801

Error Signal

  

To A100,

    N100,

   N650

Fig

 

.5 Block Diagram for EX-1A1

 

  Supply Voltage System

Содержание 21BM18

Страница 1: ...FILE NO SM CTV O 154 COLOR TELEVISION SERVICE MANUAL MODEL NO 21BM18 CHASSIS NO EX 1A1 Please read this manual carefully before service...

Страница 2: ...ADJUSTMENTS 5 CIRCUIT ADJUSTMENTS 8 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 14 STRUCTURE BLOCK DIAGRAM 14 BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM 15 CHASSIS DESCRIPTION 16 SERVICE DATA 17 TECHNICAL...

Страница 3: ...111 167MHz Z8 Z35 223 447MHz Programs preset 236 0 235 Antenna input 75 unbalanced Picture tube Approx Effective screen dimensions 406 305mm Audio output THD 7 3W 3W Power source 110 240V 50 60Hz Weig...

Страница 4: ...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 SAFETY PRECAUTION WARNING REFER...

Страница 5: ...ined 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 haz...

Страница 6: ...l safety related characteristics MAINTENANCE 1 Install the TV set on a stable and level surface Do not place the set near or over a radiator or heat register or where it is exposed to direct sunlight...

Страница 7: ...set 1 3 Operate the TV for at least 15 minutes 1 4 Degauss the TV set using a specific degaussing coil 1 5 Set the brightness and contrast to maximum 1 6 Counter clockwise rotate the R B low brightnes...

Страница 8: ...enter of the screen 2 1 4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue horizontal on the center of the screen 2 1 5 Adjust two tabs of the 6 pole magnet to su...

Страница 9: ...n better convergence in circumference 2 2 5 Fix the deflection yoke position and put the third wedge in either upper space Fasten the deflection yoke assembly on the picture tube 2 2 6 Detach the temp...

Страница 10: ...e 2 1 Make sure that the supply voltage is within the range of the rated value 2 2 Connect a digital voltmeter to the B voltage output terminal of the TV set Power on the TV and set the brightness and...

Страница 11: ...service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings 6 1 1 Set the volume to 0 Then press and hold the MUTE button on the remote control and press the...

Страница 12: ...gun cutoff voltage GRN 20 Green gun cutoff voltage WPR 1F Red gun drive voltage WPG 1F Green gun drive voltage WPB 1F Blue gun drive voltage YDFP Y DFN 07 PAL brightness delay time NTSC brightness de...

Страница 13: ...and the buttons to adjust The data sheet may differ dependent on different models The data sheet may differ dependent on different CRTs for the same model 6 3 Option set With remote control system so...

Страница 14: ...6 OP_ON BLACK 0 OP2 7 OP_FSL 0 0 OP_ENGLISH English 1 1 OP_FARSI Farsi or Czech 1 2 OP_ARABIC Arabic or Slovakian 1 3 OP_RUSSIAN Russian 1 4 OP_FRENCH French 1 5 OP_GERMAN German 1 6 OP_ITALY Italian...

Страница 15: ...hen power on set to 0 typically 0 1 OP_PSNS 0 2 OP_BSCREEN 1 3 OP_SECAM SECAM color system option 1 Yes 1 4 OP_DFL 1 5 OP_SIF External SIF amplifier 1 Yes 0 No 1 6 OP_EXT_SIF0 1 OP6 7 OP_EXT_SIF1 Soun...

Страница 16: ...4C08 Audio Prec essor TDA7449 H Drive V OUT TDA8356J Audio Amp lifier TDA7057AQ H OUT FBT T402 Power Supply Circuit STR F6654 or STR G5653 3 3V 5V 1 15V 115V CRT Audio Video Input Output Band 1 2 Vt A...

Страница 17: ...1 8V 5V 2 To A100 VD891 115V To N600 VD881 15V H VD871 15 S 5V 1 To H Out EEPROM R C Input 3 3V To N100 Keyboard Switch Transformer T804 Power Regulation and Control Circuit STR G5653 F6654 Bridge Rec...

Страница 18: ...dvanced functions with fewer external components which provide much convenience for manufacturing and technical service 2 The EX 1A1chassis series mainly use the following ICs and assemblies Table 1 K...

Страница 19: ...they are mounted in S DIP envelope with 64 pins The features are given in the following feature list The differences between the various ICs are given in the table on page 4 2 Features TV signal proc...

Страница 20: ...processor Teletext decoder with embedded Controller TDA935X 6X 8X PS N2 series Controller 80C51 controller core standard instruction set and timing 1 s machine cycle 16 128Kx8 bit late programmed ROM...

Страница 21: ...ng and italics Soft colours using CLUT with 4096 colour palette Globally selectable scan lines per row 9 10 13 16 and character matrix 12x10 12x13 12x16 VxH Fringing Shadow selectable from N S E W dir...

Страница 22: ...SERVICE MANUAL 20 3 Block Diagram Fig 6 Block Diagram for TDA935 6 8 PS N2 with Mono Intercarrier Sound Demodulator...

Страница 23: ...SERVICE MANUAL 21 Fig 7 Block Diagram for TDA935 6 8 PS N2 with QSS IF Sound Channel...

Страница 24: ...L EWD 1 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...

Страница 25: ...demodulator QSS IF amplifier and East West output or not and on some software control bits The valid combinations are given in table 2 2 The vertical guard function can be controlled via pin 49 or pin...

Страница 26: ...SERVICE MANUAL 24 Fig 8 Pin Configuration SDIP 64...

Страница 27: ...nected to an independent input output Y0 and Y1 and the other side connected to a common input output Z With E LOW one of the two switches is selected low impedance ON state by Sn With E HIGH all swit...

Страница 28: ...tate the more positive voltage L LOW state the less positive voltage X STATE is immaterial Fig 21 Schematic Diagram One Switch Fig 11 Ratings Limiting values in accordance with the Absolute Maximum Sy...

Страница 29: ...tected on all pins 2 General Description The TDA7057AQ is a stereo BTL output amplifier with DC volume control The device is designed for use in TVs and monitiors but is also suitable for battery fed...

Страница 30: ...mode 2 General Description The TDA8356 is a power circuit for use in 90 and 110 colour deflection systems for field frequencies of 50 to 120 Hz The circuit provides a DC driven vertical deflection ou...

Страница 31: ...l In 1 0dbsteps for balancefacility independent mute function All function are programmable via Serial bus 2 descripion The tda7449 is a volume tone bass and treble Balance left right processor for qu...

Страница 32: ...SERVICE MANUAL 30 4 Pin Connection Fig 16 5 Electrical Characteristics...

Страница 33: ...VS 9V RL 10K RG 600 all controls flat G 0dB unless otherwise specified NOTE1 1 The device is functionally good at Vs 5V a step down on Vs to 4V does t reset the device 2 BASS and TREBLE response The c...

Страница 34: ...ation Two wire serial interface bus I2 C Bus compatible Filtered inputs for noise suppression with Schmitt trigger Clock frequency up to 400 kHz High programming flexibility Internal programming volta...

Страница 35: ...units Cycle by cycle current limiting under voltage lockout with hysteresis over voltage protection and thermal shutdown protects the power supply during the normal overload and fault conditions Low c...

Страница 36: ...F6654 Pin No Symbol Function Description 1 OCP FB Over current protection detection signal voltage limiting signal input 2 S MOSFET source 3 D MOSFET drain 4 VIN Supply voltage input for control circ...

Страница 37: ...SERVICE MANUAL 35 3 WAVEFORMS OF KEY POINTS NI00 Pin58 NI00 Pin33 NI00 Pin34 NI00 Pin44 NI00 Pin22 NI00 Pin21 BU250 8DX B BSC60H HEAT...

Страница 38: ...SERVICE MANUAL 36 Notes The waveforms are only for reference The waveforms may differ dependent on different models BCT 4 Pin4 N100 P40...

Страница 39: ...3 6 12 Pincushion input negative 0 13 Pincushion input positive 0 8 9 0 8 8 Table 4 Function and Service Data of TDA8356 N401 s Pins Digital Multimeter Victor DT890D Pin No Symbol Reference Voltage V...

Страница 40: ...ive Resistance K 1 CREF 4 0 28 2 21 9 2 VS 8 0 1 8 1 8 3 PGND 0 0 0 4 ROUT 3 3 9 4 9 3 5 LOUT 3 3 9 4 9 3 6 R_IN1 4 0 21 9 26 0 7 R_IN2 4 0 26 7 24 3 8 L_IN1 4 0 26 7 24 3 9 L_IN2 4 0 21 9 26 1 10 MUX...

Страница 41: ...4 18 7 20 AVL EWD 1 0 01 27 6 21 2 21 VDRA 2 4 27 6 20 4 22 IFIN1 2 4 27 6 20 3 23 IFIN2 1 8 24 7 19 8 24 IREF 1 8 24 7 19 9 25 TUNERAGC 3 8 25 3 20 5 26 AUDEEM SIFIN1 1 3 8 27 7 21 5 27 DECSDEM SIFIN...

Страница 42: ...5 27 6 20 8 50 BLKIN 6 0 27 9 21 3 51 RO 2 6 1 1 1 1 52 GO 2 5 1 1 1 1 53 BO 2 4 1 1 1 1 54 VDDA 3 2 11 0 11 3 55 VPE 0 0 0 56 VDDC 3 2 11 0 11 3 57 OSCGND 0 02 58 XTALIN 59 XTALOUT 60 RESET 0 0 0 61...

Страница 43: ...teristics Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols or UL FCC FDA or VDE marking on the circuit d...

Страница 44: ...C I R C U I T D I A G R A M F O R 2 1 B M 1 8...

Страница 45: ...CRT RGB PCB...

Страница 46: ...MAIN PCB...

Страница 47: ...Connector XPK03 Wired Connector XPK03 Wired Connector XS161 Wired Connector XS161 Wired Connector XPK02 Wired Connector XPK02 XS600 XS600 XSA04 XSA04 XSA05 XSA05 XS320 XS320 XSY03 XSY03 XS500 XS500 X...

Страница 48: ...Red Remote Sensor Board Assembly Black See Diagram B Side AV Board Assembly Grey Yellow Blue Diagram B Buttons Board Assembly or 21 30 36 38 37 Final Assembly Diagram 1...

Страница 49: ...40 40 27 27 13 13 27 27 13 13 2 2 11 11 39 39 13 13 KDY KDY A View A View Blue Blue Yellow Yellow Red Red Green Green 8 8 A A Final Assembly Diagram 2...

Страница 50: ...23 33 27 25 26 24 or or Final Assembly Diagram 3...

Страница 51: ...y Black Black Wire clip A Wire clip A Six button assembly Six button assembly Wired connector KDY Wired connector KDY Wired connector XS10B Wired connector XS10B Wired connector XS10A Wired connector...

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