Sharp LC-20S2U Service Manual Page 1

LC-20S2U-SSERVICE MANUALIn the interests of user-safety (Required by safety regulations in some countries) the set should be restoredto its original c

LC-20S2U-S108. Remove the 3 lock screws from the main PWB and undo the hooks a and b. Lifting the other PWBs close to thehooks, draw out the main PWB.

LC-20S2U-SCOPYRIGHT © 2003 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication may be reproduced,stored in a retrieval system, or tran

LC-20S2U-S11» Precautions in handling the LCD panels1. Work in a clean room (with humidities below 50%).2. Be sure to wear an anti-static armband.3. H

LC-20S2U-S12Step Part No. Description1 QCNW-A556WJZZ Extension Cable 50-pin Main (SC2001)-Sub (SC3401)2 QCNW-A553WJZZ Extension Cable 30-pin Main (SC1

LC-20S2U-S13ADJUSTING PROCEDURE OF EACH SECTION1. Pre-adjustment preparationsUse the specific AC adaptor or a stable DC power supply as power source.

LC-20S2U-S142. Adjusting procedure(1) Getting initialized1) Set pins (81) and (82) of the IC2001 microprocessor to GND. Turn on the power.2) Make sure

LC-20S2U-S15(5) Factory settings1) Starting the factory process modePress "MENU" and "INPUT SELECT" at once, and the power is turn

LC-20S2U-S163. Test patterns in adjustment process mode(1) IC801 (Video decoder) test patterns1) Getting the test patterns displayedPut the screen in

LC-20S2U-S17Pin No.I/O Pin Name Function1 I Vhold2 I/O HLF3 O 1 BIT_MUTE4 O OPC_LED5OVGH6 I CSYNC7 I IREM18 O BYTE9 O CNVss10 I Xcin11 O Xout12 I RESE

LC-20S2U-S18Pin No.I/O Pin Name Function51 I SSW252 O HPMUTE53 O SP MUTE 154 O CVBS/Y55 I HP DET56 O SSTBY57 I VSH IN58 O LMUTE59 O V IN/OUT60 O SRESE

LC-20S2U-S19Page No. ItemInitialFunctionResponse precautions on servicingValue (Do not change other items than designated.)1 MODEL A622INCH SIZE 20ERR

LC-20S2U-S2CAUTION: FOR CONTINUEDPROTECTION AGAINST A RISK OFFIRE REPLACE ONLY WITH SAMETYPE F3701 (2.0A, 250V), F3301(1.25A, 250V), F6700 (1.25A, 25

LC-20S2U-S20SOUND3 BASS EQ SET 0TREB EQ SET 0EQ LIMIT 00 00EQ LIMIT 00 +12.0EQ LIMIT 01 10EQ LIMIT 01 +12.0EQ LIMIT 02 20EQ LIMIT 02 +12.0EQ LIMIT 03

LC-20S2U-S21SOUND4 0 BAND1 +02750 BAND2 -04500 BAND3 -01750 BAND4 +06000 BAND5 +04001 BAND1 +03251 BAND2 -04501 BAND3 -01751 BAND4 +06001 BAND5 +04502

LC-20S2U-S22SOUND5 0 BAND1 +02750 BAND2 -04500 BAND3 -01750 BAND4 +06000 BAND5 +0400-1 BAND1 +0225-1 BAND2 -0450-1 BAND3 -0175-1 BAND4 +0600-1 BAND5 +

LC-20S2U-S23Video setting (XV750)XVC01 TEST PAT MODE 0TEST PAT PICT 0TEST PAT AMP 0VCXO MODE A 1VCXO MODE B 2VCXO CTL DC OFST 0VCXO CTL TC 11SV PORT P

LC-20S2U-S24XVC07 N358 TV CHROMA BPF 0N358 AVC CHROMA BPF 0N358 AVS CHROMA BPF 0N358 BPFS 0N358 LUMA DIG FIX GAIN 191N358 TV COLOR +35N358 AV COLOR +3

LC-20S2U-S25XVC12 PAL-N TV PEAKING FILTER 0PAL-N AVC PEAKING FILTER 0PAL-N AVS PEAKING FILTER 0PAL-N TV H-PEAKING 6PAL-N AVC H-PEAKING 6PAL-N AVS H-PE

LC-20S2U-S26XVC17 PAL60 TV CHROMA BPF 0PAL60 AVC CHROMA BPF 0PAL60 AVS CHROMA BPF 0PAL60 LUMA DIG FIX GAIN 195PAL60 TV COLOR 20PAL60 AV COLOR 20PAL60

LC-20S2U-S27Picture (DPS)DPS01 DPS DATA 0DPS DATA WAITDPS TESTP OFFN358 TV COLOR 25N358 AV COLOR 30N358 TV TINT 6N358 AV TINT 4N358 BRIGHTNESS 12N358

LC-20S2U-S28Color depth setting (TV) Not used.Color depth setting (Composite, S Video,Not used.for component 480I)Color tone setting (TV) Not used.Col

LC-20S2U-S29DPS27 PAL60 AV PKLEVEL 5PAL60 AV PKCORRED7A 159PAL60 AV PKCFSOFT7C 6DPS28 PAL60 AV CTI7D 153PAL60 AV CTIBWLP7C 0DPS30 PAL60 HPRESC FIL42 0

LC-20S2U-S3PRECAUTION: POUR LAPROTECTION CONTINUECONTRE LES RISQUESD'INCENDIE, REMPLACER LEFUSIBLE PAR UN FUSIBLE DEMEME TYPE F3701 (2.0A, 250V),

LC-20S2U-S30DPS40 D2 HPRESC FIL42 48D2 HSCPRESC 176D2 HPOSC UPSF60 0D2 HSCPOSC 4095D2 VSCPOSC 4E 61D2 VSCPOSC 4F 10D2 VSCPOSC 50 0D2 VOFPOSC 0D2 VPOSC

LC-20S2U-S31Horizontal shift pixel setting (TV, composite,Not used.S Video, for component 480I)Vertical shift line setting (TV, composite,Not used.S V

LC-20S2U-S32DPS47 NTSC TV LMIX78 79NTSC AV LMIX78 79DPS48 NTSC TV BLEMODE 3NTSC AV BLEMODE 3NTSC TV BGAINREF71 199NTSC AV BGAINREF71 199NTSC TV POINT7

LC-20S2U-S33DPS52 PAL TV BLEMODE 3PAL AV BLEMODE 3PAL TV BGAINREF71 199PAL AV BGAINREF71 199PAL TV POINT72 21PAL AV POINT72 21PAL TV MINFIL73 71PAL AV

LC-20S2U-S34DACDAC 1 V0 H 240V0 L 30V7 H 212V7 L 52V21 H 197V21 L 67V64 H 181V64 L 82DAC 2 V112 H 159V112 L 100V176 H 124V176 L 133V235 H 20V235 L 235

LC-20S2U-S35PUBLIC MODE SETTING PROCEDURE1. How to start Public Mode» There are the following two ways to get the public mode setup screen displayed.1

LC-20S2U-S362. How to exit Public ModeThere are the following ways to quit the public mode setup screen.» Turn off "PUBLIC MODE" in the adju

LC-20S2U-S375. On Setting Items* "EZ-SETUP" discussed below indicates "EZ-SETUP after the first power-on". (1) MAXIMUM VOLUME (2)

LC-20S2U-S38 (5) MENU BUTTONSelectionDefaultFunctionExceptionSelection between "RESPOND" and "NO RESPOND" (loop provided)RESPONDDi

LC-20S2U-S39 (8) INPUT MODE FIXEDSelectionDefaultFunctionKeysinoperativeexcept fordefault settingRemarksSelection between "VARIABLE" and &qu

LC-20S2U-S4Precautions for using lead-free solder1 Employing lead-free solder"All PWBs" of this model employs lead-free solder. The LF symbo

LC-20S2U-S40Sound only mode function specifications1 Behavior of the remote control BRIGHT button.BRIGHTNESS [BRIGHT]→BRIGHTNESS [NORMAL]→BRIGHTNESS [

LC-20S2U-S41Table of Key Functions in Sound Only ModeKeyFunctionsSound only mode setup process Sound only mode processSpecial reset key» Mute cleared.

LC-20S2U-S42TROUBLE SHOOTING TABLENo or Wrong PictureDoes the IC801 test pattern appear properly?Does the IC1201 test pattern appear properly?Check th

LC-20S2U-S43TROUBLE SHOOTING TABLE (Continued)Check all the settings on the microprocessor s adjust process menu.No pictureNo picture at allYesNoCheck

LC-20S2U-S44No colorNo TV colorNo S-VIDEO colorNoNoIs input at Pin (116) of IC801 as specified?Check SC3411, SC3412, SC line and peripheral parts.Is i

LC-20S2U-S45TROUBLE SHOOTING TABLE (Continued)No sound from speakersYesNoIs pin (53) of IC2001 at “L”?Check all the settings on the microprocessor’s a

LC-20S2U-S87109654321AB CDEFGH46CHASSIS LAYOUTR/C, LED UnitSUB UnitINVERTER Unit

LC-20S2U-S471716 1918151413121110MAIN Unit

LC-20S2U-S87109654321AB CDEFGH48BLOCK DIAGRAM

LC-20S2U-S491716 1918151413121110

LC-20S2U-S5ItemsLCD panelNumber of dots 921,600 dots VGAVideo color systems N358, N443, PAL, PAL-M, PAL-N, SECAM, PAL-60TV Standard (CCIR) NTSC/PAL-M/

LC-20S2U-S87109654321AB CDEFGH50OVERALL WIRING DIAGRAM

LC-20S2U-S511716 1918151413121110

LC-20S2U-S52VOLTAGE MEASUREMENT CONDITION:1. The voltages at test points are measured onexclusive AC adaptor and the stable supply voltageof AC 120V.

LC-20S2U-S53654321ABCDEFGHSCHEMATIC DIAGRAMËR/C, LED Unit

LC-20S2U-S87109654321AB CDEFGH54ËMAIN Unit-1/6

LC-20S2U-S551716 1918151413121110

LC-20S2U-S87109654321AB CDEFGH56ËMAIN Unit-2/6

LC-20S2U-S571716 1918151413121110

LC-20S2U-S87109654321AB CDEFGH58ËMAIN Unit-3/6

LC-20S2U-S591716 1918151413121110

LC-20S2U-S6OPERATION MANUAL• TV/VIDEO, CH ()/(), VOL (–)/(+), and MENU on the main unit have the same functions as the same buttonson the remote contr

LC-20S2U-S87109654321AB CDEFGH60ËMAIN Unit-4/6

LC-20S2U-S611716 1918151413121110

LC-20S2U-S87109654321AB CDEFGH62ËMAIN Unit-5/6

LC-20S2U-S631716 1918151413121110

LC-20S2U-S87109654321AB CDEFGH64ËMAIN Unit-6/6

LC-20S2U-S651716 1918151413121110

LC-20S2U-S87109654321AB CDEFGH66ËSUB Unit-1/4

LC-20S2U-S671716 1918151413121110

LC-20S2U-S87109654321AB CDEFGH68ËSUB Unit-2/4

LC-20S2U-S691716 1918151413121110

LC-20S2U-S7CHVOLPOWERENTERBRIGHTMUTESLEEP PIC. FLIPAUDIOONLYCCTV/VIDEOFLASH-BACKDISPLAY MENUREMOTE CONTROL1 POWER Switch the Liquid Crystal Television

LC-20S2U-S87109654321AB CDEFGH70ËSUB Unit-3/4

LC-20S2U-S711716 1918151413121110

LC-20S2U-S72654321ABCDEFGHËSUB Unit-4/4

LC-20S2U-S73654321ABCDEFGHËINVERTER Unit

LC-20S2U-S74654321ABCDEFGHPRINTED WIRING BOARD ASSEMBLIESMAIN Unit (Side-A)

LC-20S2U-S75654321ABCDEFGHMAIN Unit (Chip Parts Side-A)R2120TP2002R2026R2037R2046C2011 R2040R2048R2044C2012C8245C8248C8249C2013X8201C8247X2001L8206C82

LC-20S2U-S76654321ABCDEFGHMAIN Unit (Side-B)

LC-20S2U-S77654321ABCDEFGHMAIN Unit (Chip Parts Side-B)TL1293TL1294TL1296TL1297TL1299TL1300TL1302TL1305TL1312TL1310TL1278TL1252R1266TL1253TL1254TL1306

LC-20S2U-S87109654321AB CDEFGH78

LC-20S2U-S791716 1918151413121110SUB Unit (Side-A)

LC-20S2U-S8DIMENSIONS43/64(103)55/32(131)821/32(220)243/64(68)73/16(182.5)185/8(473)1821/32(474)157/8(403.3)163/16(411)185/8(473)9 (228.5)1127/32(300.

LC-20S2U-S87109654321AB CDEFGH80J3409J3701R3704R3701P3601R3349R3347R3348R3724C3715R3351R3350R3352C3405D3702D3703R3741C3717R3404C3714C3410C3713D3404Q37

LC-20S2U-S811716 1918151413121110SUB Unit (Chip Parts Side-A)J3402SC3412R3403R3416R3414D3402TP3002FH6504 FH6503R3415C3420FH6502C3746C3750C3333D3718D33

LC-20S2U-S87109654321AB CDEFGH82TL6707TL6706TL6705TL6704TL6703TL6702TL6701TL6700R6743R6759R6702C6703R6703Q6702D6700R6754R6749IC6700R6744C6701TL6019C67

LC-20S2U-S831716 1918151413121110INVERTER Unit (Side-A)INVERTER Unit (Side-B)R6716IC6702R6717TL6023Q6709C6713R6746C6714R6715R6714TL6031TL6720Q6708TL60

LC-20S2U-S84654321ABCDEFGHR/C, LED Unit (Chip Parts Side-A)(QPWBSB982WJN1)R/C, LED Unit (Side-A)(QPWBSB982WJN1)C4202C4201IC4201P4001D4008C4203C4001R40

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code85LC-20S2U-S★ MARK: SPARE PARTS-DELIVERY SECTION★ MARQUE: SECTION LIVRAIS

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code86LC-20S2U-SDUNTKB980FE06MAIN Unit (Continued)Q1106 VS2SA1729//-1Y J 2SA1729

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code87LC-20S2U-SDUNTKB980FE06MAIN Unit (Continued)C830 RC-KZA041WJZZY J 10 10V Ce

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code88LC-20S2U-SDUNTKB980FE06MAIN Unit (Continued)C8207 VCCCCY1HH180JY J 18p 50V

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code89LC-20S2U-SDUNTKB980FE06MAIN Unit (Continued)R1223 VRS-CY1JF220JY J 22 1/16W

LC-20S2U-S9REMOVING OF MAJOR PARTS1. Remove the stand fixing screws (4 pcs.).2. Remove the terminal cover.3. Remove the terminal section fixing screws

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code90LC-20S2U-SDUNTKB980FE06MAIN Unit (Continued)DUNTKB981FE03SUB UnitFB8202RBLN

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code91LC-20S2U-SD3711 VHD1SS250//1EY J Diode ABD3717 VHDDAN222//-1Y J Diode AAD37

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code92LC-20S2U-SDUNTKB981FE03SUB Unit (Continued)C3709 VCCCCY1HH471JY J 470p 50V

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code93LC-20S2U-SDUNTKB981FE03SUB Unit (Continued)R3429 VRS-TQ2BD750JY J 75 1/8W M

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code94LC-20S2U-SDUNTKB982DE03R/C, LED UnitINTEGRATED CIRCUITSIC4201 VHiTPS850++-1

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code95LC-20S2U-SDUNTKB983WJ03INVERTER Unit (Continued)C6727 VCKYCY1CB333KY J 0.03

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code96LC-20S2U-SCABINET AND MECHANICAL PARTS1 Not Available– Cabinet A Ass’y Un

97654321ABCDEFGHLC-20S2U-SCABINET AND MECHANICAL PARTSMAAKOHIBAAFEDJKNMGIHOJCGBBBDAAFENQCR1-1-41-1-31-1-31-1-51-1-21-1-61-35-3-35-3-65-3-75-3-15-3-25-

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code98LC-20S2U-SSUPPLIED ACCESORIESPACKING PARTS(NOT REPLACEMENT ITEM)LHLDWA002WJ

99LC-20S2U-SPACKING OF THE SET★ Wrapping Paper (SPAKPA230WJZZ)★ Buffer Material (SPAKXA338WJZZ)★ Buffer Material (SPAKXA338WJZZ)★ Packing Case