1. Manuals
  2. Brands
  3. Sharp Manuals
  4. TV
  5. 28JS-74E
  6. Service manual

Sharp 28JS-74E Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
PAL
B/G, I
ELECTRICAL SPECIFICATIONS ................... 3
IMPORTANT SERVICING NOTES ................. 4
CONTROLS & TERMINALS ........................... 5
ADJUSTMENT PROCEDURES ...................... 6
PRINTED WIRING BOARDS ........................ 13
COMPONENT LOCATION TABLES ............... 19
CHASSIS LAYOUT ......................................... 24
SCHEMATIC DIAGRAMS ............................... 26
SHARP CORPORATION
SERVICE MANUAL
/ SECAM
L/L', B/G, D/K
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
BLOCK DIAGRAM ....................................... 38
TROUBLESHOOTING TABLES ..................... 39
ICs ADDITIONAL INFORMATION .................. 44
LED FLASHING CODES ................................. 60
PARTS LISTING ............................................. 61
SERVICING NOTES.................................... 69
SOURCE OF DOCUMENTATION .................. 73
1
GA-200
SYSTEM COLOUR TELEVISION
28JS-74E
This document has been published to
be used for after sales service only.
28JS-74E
SE0028JS74E00
nd
Issued: 2
Sept. 2002
CHASSIS
C/F

Advertisement

Table of Contents
loading

Related Manuals for Sharp 28JS-74E

Summary of Contents for Sharp 28JS-74E

  • Page 1: Table Of Contents

    28JS-74E SERVICE MANUAL SE0028JS74E00 Issued: 2 Sept. 2002 GA-200 CHASSIS / SECAM SYSTEM COLOUR TELEVISION B/G, I L/L’, B/G, D/K 28JS-74E 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 28JS-74E SERVICE MANUAL UPDATE LOG SHEET Technical Report No. Application Cause / Solution Part No. Page No. Technical Bulletin No. Data /Serial No. Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc. If only part number changes are required, just change part number directly the part number in the Parts Listing Section.

  • Page 3: Electrical Specifications

    Set brightness control to get total picture tube cathode current of 600 µA under no signal condition. Maximum necessary correction of each picture tube cathode current to get 7250 degrees K-11 MPCD (28JS-74EC) or 8550 degrees K+1 MPCD (28JS-74E/EF) screen temperature should not exceed 15% of its original value.

  • Page 4: Important Servicing Notes

    28JS-74E IMPORTANT SERVICING NOTES Only qualified service personnel are allowed to carry out maintenance and repair of this receiver. Servicing of High Voltage System and CRT It is important that the static charge is removed from the high voltage system when carrying out work on the receiver.

  • Page 5: Controls & Terminals

    28JS-74E CONTROLS & TERMINALS  ,  ,, &+ 6&$57 3(5,7(/(9,6,21 $97(50,1$/...

  • Page 6: Adjustment Procedures

    28JS-74E REMOTE CONTROL ∼ 9&5 799,'(2 ,,,,,, 79  9&5  7(;7 5(027( &21752/ ADJUSTMENT PROCEDURES All adjustments to this chassis, except for focus, are carried out in the Service Mode. Service Mode The Service Mode is provided to enable the engineer to correctly set up the receiver to the CRT fitted in the set.
  • Page 7 28JS-74E • • • • • Use the channel up and down buttons to move between the options. • • • • • Use the volume control buttons to change the data. • • • • • To store the data, use the stand-by button on the remote control.
  • Page 8 28JS-74E The following geometry adjustments can be carried out. Detailed instructions on how to execute these are given on the following pages: Horizontal • Horizontal Shift Vertical • Vertical Amplitude • East West Width • S Correction • Pin Phase •...
  • Page 9 28JS-74E Upper Corner Correction Adjust the Upper Corner Correction so that the picture is centred. The effect of this adjustment is shown in figure 6. • When the volume up button is pressed, side pincushion changes from pincushion to barrel shape.
  • Page 10 28JS-74E Vertical Bow Adjust the Vertical Bow so that the picture is centred. The effect of this adjustment is shown in figure 11. • When the volume up button is pressed, the vertical bow changes to left. • When the volume down button is pressed, the vertical bow changes to right.
  • Page 11 5. If another NVM value has to be changed, use the channel down button to select the page or position and repeat as necessary. Note: DO NOT change any NVM data, unless you have been advised to do so by a Sharp representative. If data is incorrectly changed, serious damage may occur to the receiver. Contrast Adjustments Three types of contrast levels can be varied as listed below: •...
  • Page 12 28JS-74E DVCO Adjustment (NTSC) Carry out the DVCO Adjustment (NTSC) as shown below: 1. Receive a color pattern signal (NTSC 3.58). 2. While in the DVCO ADJUSTMENT (NTSC) menu, press the stand-by button. 3. The adjustment will be carried out automatically and stored.

  • Page 13: Printed Wiring Boards

    28JS-74E PRINTED WIRING BOARDS F7353N0D Digital Module Unit PWB Component side Q6006 JF6013 (RT) JF6012 R6043 C6025 L6001 IC6005 C6035 Q6005 C6043 C6014 L6002 X6001 R6046 X6002 ESPA¥A C6037 R6061 FB6046 R6063 K7353BM FB6047 C6052 R6005 (VI) JL2. R6004 L6004...
  • Page 14 28JS-74E F7351N1A Mother Unit PWB. Component side. K7351BM S702 S704 S705 M1000 (SWRC) R1036 C1022 LP701 D1002 D1001 S703 (RC) S701 Q706 (OPC) (ST) C701 L701 C703 R730 C706 VR701 D702 D703 D701 C746 D704 (AA) C704 J196 R714 R746...
  • Page 15 28JS-74E F7351N1A Mother Unit PWB. Component side. PWBF7351BMN1 L302 L352 R358 C356 C1031 (SS) (FV) C361 R423 IC301 C363 L350 C351 (YC) (HD) C378 C388 C389 IC302 L351 L303 J193 (FRONT) (VS) R337 C365 L315 +16V D798 L702 R359 C372...
  • Page 16 28JS-74E F7351N1A Mother Unit PWB. Copper side. QWBF7351BMN1 L302 R353 L352 R358 C359 C353 C380 C356 C382 (SS) (FRONT) C1043 R352 R351 R436 C350 R350 (FV) C361 C354 C391 C364 R335 R329 C1031 D307 C387 C416 R338 L353 R339 IC301...
  • Page 17 28JS-74E F7351N1A Mother Unit PWB. Copper side. S703 S705 S704 M1000 R1042 R1055 (SW1) JF56 JF58 R1032 R1031 JF55 R1019 Q1002 Q1003 R1013 R1037 S702 LP701 (SWRC) (RC) R1015 S701 D1002 D1001 (ST) (OPC) D703 D702 C799 D701 D704 (AA)
  • Page 18 28JS-74E F7352N1A CRT Unit PWB Component side D1815 VR1801 ESPA¥A K7352BM D1813 C1814 R1832 (G2) R1834 R1831 R1833 D1814 (L3) L1801 C1811 C1826 (K). C1825 (H). F7352N1A CRT Unit PWB Copper side F7352BMN1 VR1801 L1802 R1832 C1814 D1813 R1831 Q1801...

  • Page 19: Component Location Tables

    28JS-74E COMPONENT LOCATION TABLES F7353N0D Digital Module Unit PWB Component side Copper side...
  • Page 20 28JS-74E F7351N1A Mother Unit PWB Component side...
  • Page 21 28JS-74E F7351N1A Mother Unit PWB Component side...
  • Page 22 28JS-74E F7351N1A Mother Unit PWB Copper side...
  • Page 23 28JS-74E F7351N1A Mother Unit PWB F7352N1A Copper side CRT Unit Component side Copper side...

  • Page 24: Chassis Layout

    28JS-74E CHASSIS LAYOUT PWB A- Mother Unit, F7351N1...
  • Page 25 28JS-74E PWB B- CRT Socker Unit, F7352N1A VR1801 (G2) TP1801 (L3) (K). (H). PWB C- Digital Module Unit, F7353N0D X6001 IC6006 X6002 IC6007 IC6001 IC6003 (VI) (YA) (YB)

  • Page 26: Schematic Diagrams

    28JS-74E SCHEMATIC DIAGRAMS Description: 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.
  • Page 27 28JS-74E Red Output Green Output Blue Output Video Output +12V E-W Output V Switch V Control St-By Vp (Primary) Vertical Input E-W Control 2 Inner Correction Vertical+Input H Control...
  • Page 28 28JS-74E Vc (Horizontal) Vb (Horizontal) Headphone L Input Headphone R Input Speaker L Input Speaker L Output Speaker R Output Speaker R Input E-W Control 1 V Flyback Vertical Vertical Output Vertical - Input H Protection IF Video Output V Protection...
  • Page 29 28JS-74E R/C Pulses +400V (Power Supply Voltage) H Flyback Pulse Power Supply Switch Voltage 1 I Sense CRT Power Supply Switch Voltage 2 IF Video In Analog Y Out Analog U Out Analog V Out OSD Blanking EPROM Data D3...
  • Page 30 28JS-74E SDA33 SCL 33 Video Out Processor Xtal In 6 MHz Xtal Out 6 MHz Xtal In 24.576 MHz Xtal Out 24.576 MHz Xtal In 20.25 MHz Xtal Out 20.25 MHz...
  • Page 31 28JS-74E Schematic Diagram of CRT Unit (F7352N1A)
  • Page 32 28JS-74E Schematic Diagram of Digital Module Unit (F7353N0D) +3.3V +2,5VSTBY +3.3V +3.3VSTBY R6016 R6017 R6055 IC6003 (1%) M24128 Q6003 Q6002 C6001 C6006 R6008 BC847B BC847B R6009 470uF 100nF TX0243 TX0243 R6056 (6.3V) D6002 (1%) D6015 C3V9 DX0551 EX0542BM D6014 D6004...
  • Page 33 28JS-74E Schematic Diagram of Digital Module Unit (F7353N0D) GN0642 +13V IC6002 SST37VF +3.3VSTBY C6017 100nF +1.8V +3.3V +1.8V +3.3V R6041 180K L6006 L6005 L6004 L6003 JF6002 JF6004 C6061 X6003 C6060 22pF 20.25MHz 22pF IX1841BM B0219BM VOUT C6064 C6063 C6059 C6058...
  • Page 34 28JS-74E Page 36 Schematic Diagram of Mother Board Unit (F7351N1A) LEDOPC...
  • Page 35 28JS-74E Page 37 Schematic Diagram of Mother Board Unit (F7351N1A) STBY HOUT...
  • Page 36 28JS-74E SCHEMATIC DIAGRAM OF MOTHER BOARD UNIT (F7351N1A) PROT HEADR HEADL SC2OUTR SC2OUTL SC1OUTR SC1OUTL MUTE HEADR HEADL...
  • Page 37 28JS-74E SCHEMATIC DIAGRAM OF MOTHER BOARD UNIT (F7351N1A) SC2OUTR SC2INR SC2OUTL SC2INL SSC-CLOCK B IN G IN R IN SC1OUTR SC1INR SC1OUTL SC1INL SSC-CLOCK ALCLOCK...

  • Page 38: Block Diagram

    28JS-74E BLOCK DIAGRAM...

  • Page 39: Troubleshooting Tables

    28JS-74E TROUBLESHOOTING TABLES ± ‡ ‡ *Although the checking of these parts could be right, they may be partially damaged. So if the problem remains proceed to replace all parts. Test Point...
  • Page 40 28JS-74E ± Test Point...
  • Page 41 28JS-74E Test Point...
  • Page 42 28JS-74E *In the original situation (with the Digital Module assembled) this value is 1.8V.
  • Page 43 28JS-74E...

  • Page 44: Ics Additional Information

    28JS-74E ICs ADDITIONAL INFORMATION TDA9886TS (IC201) Features FEATURES • 5 V supply voltage • Gain controlled wide-band Vision Intermediate Frequency (VIF) amplifier, AC-coupled • Multistandard true synchronous demodulation with active carrier regeneration: very linear demodulation, • SIF-AGC for gain controlled SIF amplifier, single...
  • Page 45 28JS-74E TDA9886TS (IC201) BLOCK DIAGRAM handbook, full pagewidth...
  • Page 46 28JS-74E TDA9886TS (IC201) PINNING SYMBOL DESCRIPTION TDA9886T TDA9885T TDA9885HN TDA9886TS TDA9885TS VIF1 VIF differential input 1 VIF2 VIF differential input 2 − − n.c. not connected output port 1; open-collector FMPLL FM-PLL for loop filter DEEM de-emphasis output for capacitor...
  • Page 47 28JS-74E MSP3410G (IC303) Block Diagram...
  • Page 48 28JS-74E MSP3410G (IC303) Pinning SC2_IN_L SC2_IN_R SC3_IN_R SC3_IN_L SC1_IN_L SC1_IN_R SC4_IN_R VREFTOP SC4_IN_L MONO_IN AGNDC AVSS AHVSS AVSS AHVSS 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41...
  • Page 49 28JS-74E TDA7480L (IC501) 10W OUTPUT POWER: = 8Ω/4Ω; THD = 10% HIGH EFFICIENCY NO HEATSINK SPLIT SUPPLY OVERVOLTAGE PROTECTION ST-BY AND MUTE FEATURES SHORT CIRCUIT PROTECTION PDIP20 (14+3+3) THERMAL OVERLOAD PROTECTION DESCRIPTION The TDA7480L is an audio class-D amplifier as-...
  • Page 50 28JS-74E TDA6109JF (IC1801) Block Diagram V DD handbook, full pagewidth MIRROR 1 MIRROR 5 TDA6109JF CASCODE 1 3× MIRROR 4 V oc(3), 9, 8, 7 CURRENT 1× V oc(2), SOURCE V oc(1) 1× THERMAL DIFFERENTIAL PROTECTION CIRCUIT REFERENCE STAGE V i(1) ,...
  • Page 51 28JS-74E SDA5550 (IC6001) Block Diagram 6 hy‚tÃHˆ‘ Tyvpr… 0HPRU\ ([WHQVLRQ 6WDFN 6p„ˆv†v‡v‚ DS6H !'Y' Q…‚t…h€ÃSPH !$%Y' !'FY' 6p„ˆv†v‡v‚Ãv‡r…shpr v‡r…shpr Memory Extension Unit YS6H 8hƒ‡ˆ…rÃp‚‡…‚y H'$ T TS6H %F‘'iv‡ Counter 0 Qr…vƒur…hy 7ˆ† Core 7ˆ† 6…iv‡r… Counter 1 D‡r…shpr Interrupt Q‚…‡ÃG‚tvp Controller &KDUDFWHU...
  • Page 52 28JS-74E SDA9380 (IC6006) Block Diagram φ2 φ2 φ2 φ2 SWITCH D/A VBLO HPROT VPROT PROTON PROTECTION I²C H-OUT START UP BSOIN RESN V-OUT TEST CONTROL FH1_2 VSYNC EW-OUT HSYNC CLEXT CLKI IBEAM PW/PH-CORR HSAFE H35K H38K AVERAGE BEAM LIMITER RGB 2...
  • Page 53 28JS-74E SDA9380 (IC6006) Pin Description Pin No. Name Type Description CLKI I/TTL Input for external line locked clock *) Reference oscillator output, Crystal Reference oscillator input, Crystal CLEXT I/TTL Switching between internal (L) and external clock (H) *) TEST I/TTL...
  • Page 54 28JS-74E SDA9380 (IC6006) Pin Description Pin No. Name Type Description VREFH Reference voltage VBLO Q/TTL Vertical blanking output VREFN Ground for VREFH VREFC Reference current input Dark current input for cut off and white level control VDD(A4) Analog supply Y/R 0...
  • Page 55 28JS-74E SDA9380 (IC6006) Pin Configuration 64 63 62 61 60 59 58 57 56 55 54 53 50 49 CLKI B/V 1 G/U 1 R/Y 1 CLEXT VSS(A4) TEST V/B 0 SUBST U/G 0 RESN Y/R 0 VDD(A4) SDA 9380...
  • Page 56 28JS-74E VSP9402A (IC6007) Block Diagram...
  • Page 57 28JS-74E VSP9402A (IC6007) Pin List...
  • Page 58 28JS-74E VSP9402A (IC6007) Pin List...
  • Page 59 28JS-74E VSP9402A (IC6007) Pin List...

  • Page 60: Led Flashing Codes

    28JS-74E LED FLASHING CODES If the TV set does not work and the stereo indicator is flashing, follow the sequence according to the information below, as a guide to fault finding. 1. Unable to read or write into NVM: 66% ON, 33% OFF twice and OFF for a second.

  • Page 61: Parts Listing

    28JS-74E PARTS LISTING REPLACEMENT PARTS Replacement parts which have special safety characteristics are identified in this manual. Electrical components having such features are identified by in the Replacement Parts Listing. The use of a substitute replacement part which does not have the same safety characteristics as the factory recommended is not permitted.
  • Page 62 28JS-74E...
  • Page 63 28JS-74E...
  • Page 64 28JS-74E...
  • Page 65 28JS-74E...
  • Page 66 28JS-74E...
  • Page 67 28JS-74E...
  • Page 68 28JS-74E 1.2 1.5 1.6...

  • Page 69: Servicing Notes

    28JS-74E SERVICING NOTES 1. How to retrieve the IC6002 with scredriver (Flash Memory). 1.1.- Desoldering the Shield Case Cover. 1.2.- Introduce the screwdriver through the hole. 1.3.- Insert the screwdriver between the IC6002 and its socket. Push up the IC6002 with the screwdriver as in Figure 16.
  • Page 70 28JS-74E 2. How to retrieve the IC6002 with pincers (Flash Memory). 2.1.- Desoldering the Shield Case Cover. 2.2.- Introduce the pincers into the hole. 2.3.- Insert the pincers and take hold the IC6002. Pick up the IC6002 with the pincers as in Figure 18.
  • Page 71 28JS-74E 3. How to rewrite data in NVM. The NVM (Non Volatile Memory) is a read/write device which function is to keep data even in the case of TV set is switched off. Part of these data is recovered every time the TV is switched on, and, of course, if user makes any change in the user settings (i.e brightness, contrast, etc..).
  • Page 72 28JS-74E 4. Packing of the Set & Accessories Pack-ad SPAKX4055BMZZ Wrapper SPAKP2006BMZZ Carton Box SPAKC5482BMN2 Batteries UBATU0013TAZZ Operation Manual Set R/C Battery Cover GCOVHA009WJSA Remote Control RRMCG1071BMSA...

  • Page 73: Source Of Documentation

    28JS-74E SOURCE OF DOCUMENTATION 1. TDA 9886, Philips Data Sheet: TDA9885; TDA9886. I C-bus controlled single and multistandard alignment-fee IF-PLL demodulators. Product specification. 2002 Mar 05. http://www.semiconductors.philips.com/acrobat/datasheets/TDA9885_TDA9886_1.pdf 2. MSP3410G, Micronas Data Sheet: Preliminary data sheet: “MSP 34x0G Multistandard Sound Processor Family with Virtual Dolby Surround”, Edition March 5, 2001 (6251-476-4PD).
  • Page 74 SHARP ELECTRONICA ESPAÑA S.A. PRINTED BY: TV Division Think Ecology, please use Engineering Dept.
  • Page 75 28JS-74E SCHEMATIC DIAGRAM OF MOTHER BOARD UNIT (F7351N1A) JAKJ0101SE VOL+ VOL- S702 S703 S704 S705 L350 C350 L351 PLGN0207 PHONE +16V 3.3uH C352 C358 100nF 3.3uH M1000 K0079GE K0079GE K0079GE K0079GE (CF) 100nF 100nF (25V) (CF) -16V (FZ) (25V) +3,3VSTBY...

This manual is also suitable for:

28js-74ec28js-74ef

Table of Contents