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Sharp 28JW-73H Service Manual

Ga-20 chassis, pal i system colour television
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ELECTRICAL SPECIFICATIONS ................... 3
IMPORTANT SERVICING NOTES ................. 4
CONTROLS & TERMINALS ........................... 5
ADJUSTMENT PROCEDURES ...................... 7
POSTCODE RESET ...................................... 11
LED FLASHING CODES ............................... 12
PRINTED WIRING BOARDS ........................ 13
SHARP CORPORATION
SERVICE MANUAL
PAL I SYSTEM COLOUR TELEVISION
MODEL
In the interests of user safety (required by safety
regulations in some countries) the set should restored
to its original condition and only parts identical to
those specified should be used.
CONTENTS
CHASSIS LAYOUT ......................................... 19
ICs ADDITIONAL INFORMATION .................. 21
SCHEMATIC DIAGRAMS ............................... 36
TROUBLESHOOTING TABLES ..................... 49
PARTS LISTING ............................................. 52
PACKING OF THE SET & ACCESSORIES ... 61
SOURCE OF DOCUMENTATION .................. 62
1
SE0028JW73H00
Issued: 21
GA-20
CHASSIS
28JW-73H
This document has been published to
be used for after sales service only.
28JW-73H
May 2002
st

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Summary of Contents for Sharp 28JW-73H

  • Page 1 28JW-73H SERVICE MANUAL SE0028JW73H00 Issued: 21 May 2002 GA-20 CHASSIS PAL I SYSTEM COLOUR TELEVISION 28JW-73H MODEL In the interests of user safety (required by safety regulations in some countries) the set should restored to its original condition and only parts identical to those specified should be used.
  • Page 2 -:+ 6(59,&( 0$18$/ 83'$7( /2* 6+((7 7HFKQLFDO 5HSRUW 1R $SSOLFDWLRQ &DXVH  6ROXWLRQ 3DUW 1R 3DJH 1R 'DWD 6HULDO 1R 7HFKQLFDO %XOOHWLQ 1R 8VH WKLV SDJH WR NHHS DQ\ VSHFLDO VHUYLFLQJ LQIRUPDWLRQ DV 7HFKQLFDO 5HSRUW %XOOHWLQ  7HFKQLFDO ,QIRUPDWLRQ HWF ,I RQO\ SDUW QXPEHU FKDQJHV DUH UHTXLUHG MXVW FKDQJH SDUW QXPEHU GLUHFWO\ WKH SDUW QXPEHU LQ WKH 3DUWV /LVWLQJ 6HFWLRQ ,I \RX QHHG PRUH LQIRUPDWLRQ SOHDVH UHIHU WR WKH 7HFKQLFDO 5HSRUW %XOOHWLQ ...
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  • Page 5: How To Open The Door

    -:+ &21752/6 7(50,1$/6 I FRONT TV Main power button Power indicator Remote control sensor Volume DOWN button Volume UP button Channel DOWN button 3 4 5 6 7 Channel UP button Door HOW TO OPEN THE DOOR Press the top of the door, opening it slightly hook your finger inside and pull open.
  • Page 6 -:+ 5(027( &21752/ 1. Stand-by ON/OFF switch (TV) Video 2. Power ON / OFF switch (VCR) 3. Digit buttons 0 ∼ 9 TV/VIDEO 4. Flashback button Teletext 5. Colour button (green) 6. Colour button (red) 7. Volume DOWN/Cursor control LEFT 8.
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  • Page 15 -:+ 7'$ ,&,& = ±14V; R ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V = 8Ω; R = 50Ω; = 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; T = 25°C unless otherwise specified.) Symbol Parameter Test Condition Min.
  • Page 16 -:+ 063* ,& Loud- Loud- Sound IF1 Pre- speaker speaker processing modulator Sound Sound IF2 Subwoofer Processing Headphone Headphone Sound Processing Prescale SCART1 SCART2 SCART SCART1 SCART3 Input Prescale SCART Select Output SCART4 Select MONO SCART2 Fig. 1–1: Simplified functional block diagram of the MSP 34x0G SC2_IN_L SC2_IN_R SC3_IN_R...
  • Page 17 -:+ 063* ,& 4.6.1. Absolute Maximum Ratings Symbol Parameter Pin Name Min. Max. Unit − ° C Ambient Operating Temperature − − 40 ° C Storage Temperature − 0.3 First Supply Voltage AHVSUP SUP1 − 0.3 Second Supply Voltage DVSUP SUP2 −...
  • Page 18 -:+ 9&7 ,& VCT 38xxA/B Display RGBOUT Processor Video Panorama Video Comb Color Front-end Filter Decoder Scaler Back-end RGBIN Pict.Improv VOUT VSUPAB GNDAB AOUT MSync Audio Color, Prio VSync C Master 8-bit PWM 24 kB ROM 14-bit PWM 15:1 Mux 10-bit ADC RESQ 3 kB...
  • Page 19 -:+ 9&7 ,& VSUPP3 GNDD GNDP3 VSUPD HOUT CLK20 TEST FBLIN VPROT SAFETY VBCLK HFLB 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 VERTQ VERT SENSE...

  • Page 20: Pin Connection

    -:+ 679 ,& PIN CONNECTION CFLY + CFLY - BOOT EAout VREG FEEDCAP SGND FREQ PIN FUNCTIONS Name Function Number Negative supply Negative supply Negative supply PWM Output CFLY+ Flyback capacitor CFLY- Flyback capacitor BOOT Bootstrap capacitor VREG Internal voltage regulator FEEDCAP Feed-back integrating capacitor FREQ...

  • Page 21: Electrical Characteristics

    -:+ 679 ,& +VCC 100nF 1000µF 100nF +VCC -VCC +VCC power STV9380 TDA9380 VREG CFLY+ Flyback -VCC Flyback CFLYBACK Vref detection generator 100µF 100nF CFLY- BOOT Cboot 220nF Output 1kΩ IN - Modulator drive Input signal Deflect. EA out 200Ω 150Ω...
  • Page 22 -:+ 7($ ,& %ORFN 'LDJUDP SUPPLY START-UP V CC DRAIN MANAGEMENT CURRENT SOURCE clamp internal UVLO start n.c. VALLEY supply M-level VOLTAGE CONTROLLED LOGIC OSCILLATOR 100 mV OVER- VOLTAGE FREQUENCY CONTROL PROTECTION OVER- LOGIC DRIVER DRIVER TEMPERATURE PROTECTION I ss −1 CTRL POWER-ON...
  • Page 23 -:+ 7($ ,& CHARACTERISTICS = 25 °C; V = 15 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Start-up current source (pin 8) supply current drawn from drain pin = 0 V;...
  • Page 24 -:+ 7($ ,& SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Burst mode standby (pin 3) burst mode standby active threshold at I = 6 mA th(burst)(on) burst voltage − − burst mode standby active current th(burst)(on) − − burst mode standby inactive current th(burst)(off) µs burst mode standby blanking time...

  • Page 25: Description Of Schematic Diagrams

    28JW-73H DESCRIPTION OF SCHEMATIC DIAGRAMS NOTE: SAFETY NOTE: 1. The unit of resistance « ohm »is omitted (K=1000 1. DISCONNECT THE AC PLUG FROM THE AC ohms. M= Megaohm). OUTLET BEFORE REPLACING PARTS. 2. All resistors are 1/8 watt. unless otherwise noted.
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  • Page 37 -:+ 6&+(0$7,& ',$*5$0 2) &21752/ 81,7 )%1 &...
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