Service manual

ManualsBrandsSharp ManualsTV20F550

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

In the interests of user-safety (Required by safety regulations in some countries ) the set should be restored to its

original condition and only parts identical to those specified should be used.

COLOR TELEVISION

Chassis No. GA-4

Page

» ELECTRICAL SPECIFICATIONS .........................................................................................................1

» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2

» LOCATION OF USER'S CONTROL .....................................................................................................4

» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................5

» SERVICE MODE ..................................................................................................................................6

» ADJUSTMENT METHOD .....................................................................................................................7

» CHASSIS LAYOUT .............................................................................................................................15

» BLOCK DIAGRAM ..............................................................................................................................16

» WAVEFORMS.....................................................................................................................................20

» DESCRIPTION OF SCHEMATIC DIAGRAM......................................................................................21

» SCHEMATIC DIAGRAMS ...................................................................................................................22

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................26

» REPLACEMENT PARTS LIST ............................................................................................................30

» PACKING OF THE SET ......................................................................................................................36

CONTENTS

SPEAKER

SIZE ................................................................... 12 x 5 cm, 2pcs

VOICE COIL IMPEDANCE ............................. 16 ohm at 400 Hz

ANTENNA INPUT IMPEDANCE

VHF/UHF ..................................................... 75 ohm Unbalanced

TUNING RANGES

VHF-Channels ............................................................... 2 thru 13

UHF-Channels ............................................................14 thru 69

CATV Channels ...........................................................1 thru 125

(EIA, Channel Plan U.S.A.)

POWER INPUT .................................................... AC 120 V, 60 Hz

POWER RATING .................................................................... 88W

PICTURE SIZE .......................................... 1,239 cm

(192sq inch)

CONVERGENCE ............................................................. Magnetic

SWEEP DEFLECTION .................................................... Magnetic

FOCUS .................................................. QFP/UNI-B1 Electrostatic

INTERMEDIATE FREQUENCIES

Picture IF Carrier Frequency ..................................... 45.75 MHz

Sound IF Carrier Frequency ...................................... 41.25 MHz

Color Sub-Carrier Frequency .................................... 42.17 MHz

(Nominal)

AUDIO POWER

OUTPUT RATING ........................................ 2.5 W(RMS) x 2pcs

Specifications are subject to change without

prior notice.

ELECTRICAL SPECIFICATIONS

MODEL

SERVICE MANUAL

20F550

S64T921FL94//

Summary of content (37 pages)

PAGE 1
SERVICE MANUAL S64T921FL94// COLOR TELEVISION Chassis No. GA-4 MODEL 20F550 In the interests of user-safety (Required by safety regulations in some countries ) the set should be restored to its original condition and only parts identical to those specified should be used. CONTENTS Page » ELECTRICAL SPECIFICATIONS ......................................................................................................... 1 » IMPORTANT SERVICE SAFETY PRECAUTION ............................................
PAGE 2
0F550 IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOLTAGE LIMITS 1. For continued safety, no modification of any circuit should be attempted. 2. Disconnect AC power before servicing. 3. Semiconductor heat sinks are potential shock hazards when the chassis is operating. 4.
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20F550 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard) Before returning the receiver to the user, perform the following safety checks. 1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the receiver. 2.
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20F550 LOCATION OF USER'S CONTROL Front Panel POWER Press → On. Press again → Off. INSIDE DOOR VIDEO/AUDIO IN 2 TERMINALS REMOTE CONTROL SENSOR MENU Press → Accesses MAIN MENU. Press again → Exits MAIN MENU. CHANNEL UP/DOWN ( ) Selects next higher channel ( ) Selects next lower channel VOLUME UP/DOWN ( + ) Increases sound. ( ) Decreases sound. Basic Remote Control Functions Infrared Transmitter Window POWER Press → On. Press again → Off. DVD VCR TV REMOTE KEYPAD Accesses any channel from keypad.
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20F550 INSTALLATION AND SERVICE INSTRUCTIONS Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdrivers or TV alignment tools. (2) Before performing adjustments, the TV set must be on at least 15 minutes. CIRCUIT PROTECTION HIGH VOLTAGE CHECK The receiver is protected by a 4A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.
PAGE 6
20F550 SERVICE MODE Service Mode Overview 1. 2. 3. 4. 5. Service mode is entered by SERVICE key input or CH-UP +VOL-DOWN input during reset. Service mode is cleared by entering SERVICE key command during service mode. If key input port (SERVICE) input is LOW, then it is in service mode. During key input port (SERVICE) input is LOW, clearing service mode by key input SERVICE is disabled.
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20F550 ADJUSTMENT METHOD Caution: to get into the service mode, one of the ways is press direct key for service items.
PAGE 8
20F550 Ë SELF ADJUSTMENT H-VCO 1. 2. 3. 4. 5. 6. 7. When there is H-VCO self-adjustment key input for adjustment item H-VCO, self-adjustment is performed. H-FREE(1chip) is set to 1. H-OUT is set by intelligent monitor output. IM input is set as TIM input. H-VCO(1chip) data is changed so that the number of input pulse is 125 inside 8ms interval. When adjustment completed, OSD display and H-VCO self-adjustment status data of EEPROM are updated.
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20F550 Setting Mode Items No.
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20F550 Setting Mode Items (Continued) No.
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20F550 Option Mode Items No 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 028 029 030 OPTION FUNCTION DEMO DOWNLOAD V-CHIP SPEAKER FAO P.
PAGE 12
20F550 Adjustment Mode Items No.
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20F550 Second Stage Data Service Mode F01 VIDEO TONE -GAIN (TV) F02 VIDEO TONE -GAIN (AV) F03 VIDEO TONE -GAIN (S-AV) F04 VIDEO TONE -GAIN(YUV) F05 ABCL F06 BS F07 ABCL-G F08 SHP-AV F09 SHP-SAV F10 SHP-YUV F11 RGB-CLIP F12 E-SAVE F13 FAO-VOL F14 PIF-G F15 Y-DELAY(TV) F16 Y-DELAY(AV) F17 Y-DELAY(SAV) F18 Y-DELAY(YUV) F19 TINT-AV F20 TINT-SAV F21 COL-AV F22 COL-SAV F23 R-DRI(R2) F24 R-DRI( R) F25 R-DRI(B) F26 B-DRI(R2) F27 B-DRI( R) F28 B-DRI(B) F29 V-FREE F30 GAMMA F31 TRAP(TV) F32 TRAP(AV) F33 H-FREE F34 1W
PAGE 14
20F550 Second Stage (Continued) Data F57 F58 F59 F60 F61 F62 F63 F64 F65 F66 F67 F68 F69 F70 F71 Service Mode CP CC LEVEL OSD POS OFFSET-ADJ-COL OFFSET-ADJ-TINT OFFSET-ADJ-TINT-YUV WAIT MD TIMER R-CUT-YUV G-CUT-YUV B-CUT-YUV R-DRI-YUV B-DRI-YUV CONTRAST OFFSET BRIGHTNESS OFFSET AV2 BRIGHTNESS OFFSET Third Stage Data OPTION FUNCTION 001 DEMO 002 DOWNLOAD 003 V-CHIP 004 SPEAKER 005 FAO 006 P.
PAGE 15
20F550 CHASSIS LAYOUT H G F E D C B A 1 2 3 4 15 5 6
PAGE 16
20F550 CRT BLOCK DIAGRAM H G F E D C B A 1 2 3 4 16 5 6
PAGE 17
20F550 MAIN BLOCK DIAGRAM J I H G F E D C B A 1 2 3 4 5 6 17 7 8 9 10
PAGE 18
20F550 10 11 12 13 14 15 18 16 17 18 19
PAGE 19
20F550 MTS BLOCK DIAGRAM J I H G F E D C B A 1 2 3 4 5 6 19 7 8 9 10
PAGE 20
F550 WAVEFORMS 20
PAGE 21
20F550 DESCRIPTION OF SCHEMATIC DIAGRAM NOTES: 1. The unit of resistance "ohm" is omitted. (K=kΩ=1000Ω, M=MΩ) 2. All resistors are 1/16 watt, unless otherwise noted. 3. All capacitors are µF, unless otherwise noted. (P=pF=µµF) 4. (G) indicates ±2% tolerance may be used. 5. indicates line isolated ground. VOLTAGE MEASUREMENT CONDITIONS: 1.
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20F550 SCHEMATIC DIAGRAM: CRT Unit H G F E D C B A 1 2 3 4 22 5 6
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20F550 SCHEMATIC DIAGRAM: MAIN Unit J I H G F E D C B A 1 2 3 4 5 6 23 7 8 9 10
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20F550 10 11 12 13 14 15 24 16 17 18 19
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20F550 SCHEMATIC DIAGRAM: MTS Unit H G F E D C B A 1 2 3 4 25 5 6
PAGE 26
20F550 PRINTED WIRING BOARD ASSEMBLIES H G F E D C PWB-B: CRT Unit (Wiring Side) B A 1 2 3 4 26 5 6
PAGE 27
20F550 H G F E D C B PWB-A: MAIN Unit (Wiring Side) A 1 2 3 4 27 5 6
PAGE 28
20F550 H RJ 1 4 RJ 1 5 B1 R1 0 2 7 R1 0 2 4 R3 8 4 R3 8 3 R1 0 0 3 R1 0 0 2 R3 8 2 C1 0 1 6 R3 8 1 R1 0 0 9 R1 0 0 8 R1 0 0 6 RJ 1 7 RJ 1 6 R1 0 0 7 RJ 8 F DC1 R1 0 8 3 Z1 A1 Q1 0 7 2 R1 0 5 6 R1 0 7 9 Q1 0 7 0 Q1 0 0 2 R1 0 8 5 G R3 0 0 6 R1 0 7 8 R1 0 8 7 RJ 2 4 I C3 0 0 2 R3 1 4 R3 0 0 9 C3 0 8 1 C3 1 3 R3 1 5 RJ 2 3 R8 2 7 R1 8 4 9 R3 0 5 R8 2 1 Q8 0 5 C3 0 8 R3 0 7 RJ 4 R3 0 3 R3 0 8 RJ 2 6 R1 8 5 0 R8 3 1 Q1 0 7 3 R8 3 9 R1 8 9 5 R1 8 9 6 C8 4 5 R8
PAGE 29
20F550 H G F E PWB-C: MTS Unit (Wiring Side) D R3 0 0 4 R3 0 0 3 R3 0 2 5 C3 0 4 3 C3 0 0 2 Q3 0 0 4 R3 0 3 5 R3 0 0 5 R3 0 3 0 Q3 0 0 1 R3 0 2 9 R3 0 3 4 R3 0 2 8 Q3 0 0 2 R3 0 3 2 R3 0 2 6 R3 0 2 1 R3 0 2 7 Q3 0 0 5 R3 0 3 1 I C3 0 0 1 C3 0 4 2 R3 0 8 4 R3 0 8 5 C3 0 3 1 C3 0 2 6 R3 0 8 3 R3 0 1 6 C3 0 3 2 C3 0 2 8 C3 0 2 7 C3 0 1 3 R3 0 0 7 C3 0 3 6 R3 0 1 1 C3 0 2 4 C3 0 2 3 R3 0 1 3 C3 0 3 5 RJ 1 0 1 R3 0 1 0 R3 0 1 7 R3 0 1 5 R3 0 0 8 R3 0 1 2 R3 0 3 6 R3
PAGE 30
20F550 « Description Ref. No. Part No. PARTS LIST PWB-A: DUNTKD070WEA0 MAIN UNIT PARTS REPLACEMENT TUNER NOTE:THE PARTS HERE SHOWN ARE SUPPLIED AS AN ASSEMBLY BUT NOT INDEPENDETLY Replacement parts which have these special safety characteristics identified in this manual; electrical components having such features are identified by å and shaded areas in the Replacement Parts Lists and Schematic Diagrams.
PAGE 31
20F550 « Description Ref. No. Part No.
PAGE 32
20F550 « Description Ref. No. Part No. Code PWB-A: DUNTKD070WEA0 MAIN UNIT CAPACITORS [EL.··· Electrolytic, M-Poly.
PAGE 33
20F550 « Description Ref. No. Part No. Code PWB-A: DUNTKD070WEA0 MAIN UNIT RESISTORS [M-Ox.
PAGE 34
20F550 Ref. No. « Description Part No. Ref. No.
PAGE 35
20F550 Ref. No. « Description Part No. Code Ref. No. PWB-C: DUNTKC574WEA2 RESISTORS [M-Ox.
PAGE 36
20F550 PACKING OF THE SET ★ Polyethylene Bag Operation Manual Infrared R/C Unit ★ Batteries ★ Wrapping Paper ★ Buffer Material FRONT ★ Packing Case Use tape to fix the top side of packing case. REAR Use 10 staples to fix the bottom side of packing case. ★ MARK : Not replacement items.
PAGE 37
20F550 COPYRIGHT © 2005 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher. QRC0025-U Jan. 2005 Modify : SEMEX Design and Production Information Design base : JAPAN Production : SEMEX JB SHARP ELECTRONICA MEXICO S. A. DE C. V. Quality & Reliability Control Center Blvd. SHARP No.