Sharp 28LF-94E Service Manual
Sharp 28LF-94E Service Manual

Sharp 28LF-94E Service Manual

Pal / secam system colour television

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PAL
/ SECAM
B/G
ELECTRICAL SPECIFICATIONS ........................................................................................ 3
IMPORTANT SERVICING NOTES ...................................................................................... 4
CONTROLS & TERMINALS ................................................................................................ 5
PRINTED WIRING BOARD LAYOUT ................................................................................. 7
PARTS LISTING ................................................................................................................... 9
HOW TO UPDATE THE TECHNICAL INFORMATION ...................................................... 19

SHARP CORPORATION

SERVICE MANUAL

SYSTEM COLOUR TELEVISION
L/L', B/G, D/K
MODEL
In the interests of user safety (required by safety
regulations in some countries) the set should be re-
stored to its original condition and only parts identi-
cal to those specified should be used.
In order to service the model 28LF-94E, refer to
the
AK-53
Chassis
(SE00AK53CHA00).
CONTENTS
1
SE0028LF94S00
Issued: 7
AK- 53
CHASSIS
28LF-94E
Service
Manual
This document has been published to
be used for after sales service only.
28LF-94E
July 2004
th

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Summary of Contents for Sharp 28LF-94E

  • Page 1: Table Of Contents

    In the interests of user safety (required by safety regulations in some countries) the set should be re- stored to its original condition and only parts identi- cal to those specified should be used. In order to service the model 28LF-94E, refer to AK-53 Chassis Service Manual (SE00AK53CHA00).
  • Page 2 28LF-94E SERVICE MANUAL UPDATE LOG SHEET Technical Report No. Application Cause / Solution Part No. Page No. Data /Serial No. Technical Bulletin 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

    Y=0.300 ± 0.015 Specifications are subject to change without prior notice. MODEL DESTINATION (Operation Manual Languages) 28LF-94E: Deutsch, Français, Nederlands. WARNING The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power receptacle, when servicing this chassis.
  • Page 4: Important Servicing Notes

    28LF-94E 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

    28LF-94E CONTROLS & TERMINALS FRONT PANEL TWD9@P WD9@P GTBDÃÃÃS999 ÃÃÃÃÃÃÃÃ6V9DP TWD9@P WD9@P GTBDÃÃÃS999 ÃÃÃÃÃÃÃÃ6V9DP Speakers (left + right) VIDEO = Power On / Off AUDIO L (L/S/G/I) = Audio left = Volume -/+ AUDIO R (R/D/D/D) = Audio right = Program -/+ = Headphone 3,6 mm Ø...
  • Page 6: Double Digit

    28LF-94E REMOTE CONTROL = Stand By = Cursor Up = Cursor Right OK = Store / Still Picture = Info (Program Table) 0 - 9 = Direct Program - / - - = Double Digit = Screen Format button P/CH+ = Program Up...
  • Page 7: Printed Wiring Board Layout

    28LF-94E CHASSIS LAYOUT Mother Unit Front Unit (SW+Keyboard+FAV)
  • Page 8 28LF-94E Digital Module Unit CRT Socket Unit...
  • Page 9: Parts Listing

    28LF-94E PARTS LISTING REF No. PARTS DESCRIPTION SN CODE EX CODE Q117 30001458 TR BC858B SMD REPLACEMENT PARTS Q400 30001458 TR BC858B SMD Replacement parts which have special safety characteristics are identified in this manual. Electrical components having such features are identified by...
  • Page 10 28LF-94E REF No. PARTS DESCRIPTION SN CODE EX CODE REF No. PARTS DESCRIPTION SN CODE EX CODE D102 30007760 DIODE ZENER SMD BZT55C10 D815 30001318 DIODE BA159 1A/800V 20A D102 30018574 DIODE SCH SS33 3A/30V DO214AB D818 30001318 DIODE BA159 1A/800V 20A D102 30001371 DIODE ZENER 5.1V ZPD...
  • Page 11 30016162 FERRITE BEAD (0805) BLM21A102FPT C109 30000371 CAP EL 22UF 50V M L448 30016162 FERRITE BEAD (0805) BLM21A102FPT C110 30032105 CAP MKP 10NF 2000Vdc / 1700Vpp SHARP L456 30020936 COIL SMD 10UH 300mA WINDING TYPE(1210) C111 30012003 CAP MKP SAFE 18NF 630V J L457 30018093 COIL SMD 3.3uH (2520)
  • Page 12 28LF-94E REF No. PARTS DESCRIPTION SN CODE EX CODE REF No. PARTS DESCRIPTION SN CODE EX CODE C142 30000074 CAP MKT 100NF 63V J C429 30000295 CAP CER 100NF 50V Z F C144 30000104 CAP MKT 4.7NF 100V J C430...
  • Page 13 28LF-94E REF No. PARTS DESCRIPTION SN CODE EX CODE REF No. PARTS DESCRIPTION SN CODE EX CODE C490 30012610 CAP SMD 10NF 50V J (0603) C742 30016654 CAP SMD 100NF 16V K R (0603) C493 30016654 CAP SMD 100NF 16V K R (0603)
  • Page 14 28LF-94E REF No. PARTS DESCRIPTION SN CODE EX CODE REF No. PARTS DESCRIPTION SN CODE EX CODE C814 30016654 CAP SMD 100NF 16V K R (0603) C915 30000075 CAP MKT 100NF 250V K (DC) C815 30007308 CAP CER 220PF 1KV K (PULSE)
  • Page 15 28LF-94E REF No. PARTS DESCRIPTION SN CODE EX CODE REF No. PARTS DESCRIPTION SN CODE EX CODE R126 30000564 RES CF 1/4W 18K J R422 30012677 RES SMD 1/16W 3.3K J (0603) R127 30000718 RES CF 1/4W 4.7K J R422...
  • Page 16 28LF-94E REF No. PARTS DESCRIPTION SN CODE EX CODE REF No. PARTS DESCRIPTION SN CODE EX CODE R704 30022085 RES SMD 1/16W 33R J (0402) R785 30012641 RES SMD 1/16W 10K J (0603) R705 30022056 RES SMD 1/16W 220R J (0402) R786 30012662 RES SMD 1/16W 2.7K J (0603)
  • Page 17 R875 30022057 RES SMD 1/16W 22K J (0402) 20163353 MD.ASY.SB112-FAV+HP+SVHS 2862/3262 (AK53) (Front Unit) R876 30022042 RES SMD 1/16W 1K J (0402) 20168819 CRT B.ASSY.TP53-SIN.FOC.W/BSVM(AK53)SHARP (CRT Unit) R878 30022038 RES SMD 1/16W 180R J (0402) MISCELLANEOUS PARTS R879 30022038 RES SMD 1/16W 180R J (0402)
  • Page 18 PL702 30001831 CONN HEADER 2P 2.5MM TOP RED SD 40016872 SPEAKER BRACKET 286XW PL703 30001841 CONN HEADER 3P 2.5MM SIDE BLACK SD 30028208 POWER CORD SAFE EURO 2.2M SHARP W/FILTER PL704 30012894 CONN HEADER 10P 2.54MM TOP WHT 20152358 FRONT 2862W W/H SLV285S(P)(PW/S) PL707 30021923 CONN MALE 20P TOP 1.257 DUAL HEADER...
  • Page 19: How To Update The Technical Information

    28LF-94E HOW TO UPDATE THE TECHNICAL INFORMATION APPEARED ON THIS SERVICE MANUAL 1. Web site: https://www.vestelservice.com 2. Select: Technical Support 3. Login: 101278 4. Password: SHPII278 By this access you can consult the latest schematic diagram or request the Parts Listing of a concrete Production Date / Serial Number.
  • Page 20 Technical information and Production: Vestel Electronik AS PRINTED BY: Think Ecology, please use Technical information re-issued: SHARP ELECTRONICA ESPAÑA S.A. Service Manual Group Engineering Dept. Polígono Industrial Can Sant Joan 08190 Sant Cugat del Vallès Barcelona...

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