Sharp 28JW-73H Service Manual Download Page 2

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Summary of Contents for 28JW-73H

Page 1: ... the set should restored to its original condition and only parts identical to those specified should be used CONTENTS ELECTRICAL SPECIFICATIONS 3 IMPORTANT SERVICING NOTES 4 CONTROLS TERMINALS 5 ADJUSTMENT PROCEDURES 7 POSTCODE RESET 11 LED FLASHING CODES 12 PRINTED WIRING BOARDS 13 CHASSIS LAYOUT 19 ICs ADDITIONAL INFORMATION 21 SCHEMATIC DIAGRAMS 36 TROUBLESHOOTING TABLES 49 PARTS LISTING 52 PA...

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Page 5: ...L S G I R D D D AUDIO S VIDEO VIDEO 5 FRONT REAR R R L L WOOFER AV 2 AV TERMINAL AV 1 AV TERMINAL RGB SCART PERITELEVISION 4 2 3 1 21752 6 7 50 1 6 FRONT TV 1 Main power button 2 Power indicator 3 Remote control sensor 4 Volume DOWN button 5 Volume UP button 6 Channel DOWN button 7 Channel UP button 8 Door 2 3 4 5 6 7 1 8 Behind the door 1 S VIDEO input terminal 2 VIDEO input terminal PAL SECAM NT...

Page 6: ...Double entry Teletext 22 Colour button yellow 23 Colour button cyan TV 24 Channel UP Cursor control UP 25 Volume UP Cursor control RIGHT 26 Channel DOWN Cursor control DOWN 27 Wide Mode selector TV Teletext 28 Time button TV 29 Sound mode selector Teletext 30 Hold button TV 31 Sound Mute button Teletext 32 Text Mix Picture button 33 Index button Video 34 Channel Up selector 35 Fast forward picture...

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Page 15: ...y Voltage Rejection f 100Hz Vr 0 5 46 60 dB Tr Tf Rising and Falling Time 50 ns RDSON Power Transistor on Resistance 0 4 Ω FSW Switching Frequency 100 120 140 KHz FSW_OP Switching Frequency Operative Range 100 200 KHz BF Zero Signal Frequency Constant 1 4x109 HzΩ RF Frequency Controller Resistor Range 7 12 14 KΩ MUTE STAND BY FUNCTIONS VST BY Stand by range 0 8 V VMUTE Mute Range 1 8 2 5 V VPLAY P...

Page 16: ...7 26 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 AVSUP AVSUP ANA_IN1 ANA_IN ANA_IN2 TESTEN XTAL_IN XTAL_OUT TP AUD_CL_OUT NC NC D_CTR_I O_1 D_CTR_I O_0 ADR_SEL STANDBYQ CAPL_M AHVSUP CAPL_A SC1_OUT_L SC1_OUT_R VREF1 SC2_OUT_L SC2_OUT_R NC NC DACM_SUB NC DACM_L DACM_R VREF2 DACA_L NC AVSS AVSS MONO_IN NC V...

Page 17: ...SUP23 Voltage between AVSUP and DVSUP AVSUP DVSUP 0 5 0 5 V PTOT Power Dissipation PLCC68 PSDIP64 PSDIP52 PQFP80 PLQFP64 AHVSUP DVSUP AVSUP 1200 1300 1200 1000 960 mW mW mW mW mW VIdig Input Voltage all Digital Inputs 0 3 VSUP2 0 3 V IIdig Input Current all Digital Pins 20 20 mA1 VIana Input Voltage all Analog Inputs SCn_IN_s 2 MONO_IN 0 3 VSUP1 0 3 V IIana Input Current all Analog Inputs SCn_IN_s...

Page 18: ...Voltage all Inputs 0 3 VSUPx 0 31 V VO Output Voltage all Outputs 0 3 VSUPx 0 31 V VIO Input Output Voltage all Open Drain Out puts 0 3 6 V 9 7 Fig 1 2 Block diagram of the VCT 38xxA B shaded blocks are optional The block diagram does not show the additional features of VCT 38xxB Video Front end Comb Filter Color Decoder Display Processor Video Back end Panorama Scaler 4 3 4 12 31 2 I2 C Master 3 ...

Page 19: ...4 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 25 26 27 28 29 30 31 32 ADB7 ADB6 ADB5 VSUPADB ADB1 ADB0 DB0 DB1 DB2 DB3 VSUPDB GNDDB DB4 DB5 DB6 DB7 ADB2 ADB3 ADB4 GNDADB 72 71 70 69 68 67 66 65 49 CIN1 50 CIN2 CRIN 51 VIN1 52 VIN2 53 VIN3 54 VIN4 55 DISINTROM 56 P27 57 P26 58 P25 59 P24 60 VSUPP2 61 GNDP2 62 P23 63 P22 64 P21 97 VERTQ 98 VERT 99 EW 100 SENSE 101 GNDM 102 RSW1 10...

Page 20: ...Q Frequency setting resistor 11 SGND Signal Ground 12 IN Error amplifier inverting input 13 IN Error amplifier non inverting input 14 EA out Error amplifier output 15 VCC Positive supply 16 VCCPOW Positive Power supply 17 VccPOW Negative Power supply 18 VCC Negative supply 19 VCC Negative supply 20 VCC Negative supply 679 PIN CONNECTION 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 VCC VCC VC...

Page 21: ...mended vertical yoke current 1 25 A I13 I12 Amplifier Input bias current 0 1 µA VOS Output Offset voltage Note 1 50 50 mV SVR Supply voltage rejection Note 2 82 dB Flythr Flyback detection threshold positive slope V 14 1 5 V Flythf Flyback detection threshold negative slope V 14 0 5 V Pd Integrated circuit Dissipated power Note 3 1 1 W Fsw Switching frequency Rfreq 10kΩ 120 140 160 kHz Fsw op Swit...

Page 22: ...sing handbook halfpage MGU231 TEA1507 1 2 3 4 VCC GND CTRL DEM DRAIN HVS DRIVER Isense 8 7 6 5 Fig 3 Pin configuration h SUPPLY MANAGEMENT internal supply UVLO start M level VCC 1 2 3 GND S1 CTRL FREQUENCY CONTROL VOLTAGE CONTROLLED OSCILLATOR LOGIC LOGIC OVER VOLTAGE PROTECTION OVERPOWER PROTECTION short winding soft start S2 OVER TEMPERATURE PROTECTION S Q R UVLO Q MAXIMUM ON TIME PROTECTION POW...

Page 23: ... VCC start 650 550 450 µA ICC operate supply current under normal operation no load on pin DRIVER 1 1 1 3 1 5 mA Demagnetization management pin 4 VDEM demagnetization comparator threshold voltage on pin DEM 50 100 150 mV IDEM pin DEM current VDEM 50 mV 50 1 0 nA Vclamp DEM neg negative clamp voltage on pin DEM at IDEM 150 µA 0 5 0 25 0 05 V Vclamp DEM pos positive clamp voltage on pin DEM at IDEM ...

Page 24: ...short winding protection 300 370 440 ns Iss soft start current Vsense 0 5 V 45 60 75 µA Overvoltage protection pin 4 I OVP DEM OVP protection level at pin 4 set by the demagnetization resistor RDEM see Section OverVoltage Protection OVP 54 60 66 µA Overpower protection pin 4 I OPP DEM OPP current at pin 4 start of OPP correction Set by the demagnetization resistor RDEM see Section OverPower Protec...

Page 25: ...THE AREA ENCLOSED BY THIS LINE IS DIRECTLY CONNECTED WITH AC MAINS VOLTAGE WHEN SERVICING THE AREA CONNECT AN ISO LATING TRANSFORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE HAZARD OF ELECTRIC SHOCK CAUTION This circuit diagram is original one therefore there may be slight difference from yours SAFETY NOTE 1 DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE REPLACING PARTS 2 SEMICONDUCTOR HEAT ...

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