Sharp LC-20B1U Service Manual

LC-20B1USERVICE MANUALIn the interests of user-safety (Required by safety regulations in some countries) the set should be restoredto its original con

LC-20B1U107. Remove the digital PWB fixing screws (1 pcs.).8. Remove the inverter-A PWB fixing screws (2 pcs.).9. Remove the inverter-B PWB fixing scr

LC-20B1U11» 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. Han

LC-20B1U12Notes at the time of the side B(back) service of a digital unit1. Remove PC card slot attachment angle fixed screws(2 pcs.).2. Remove the FF

LC-20B1U13ADJUSTING PROCEDURE OF EACH SECTIONThe best adjustment is made before shipping. If any position deviation is found or after part replace is

LC-20B1U144. Adjustments1 B+ Adjustment(R3760)2 Inch Size setup(If E2PROM is replaced)(IC2004)3 Common-bias adjustment4 TAMP adjustment5 White balance

LC-20B1U155. Shipping setting listChannel...

LC-20B1U16Test patterns in adjustment process mode[1] IC801 (Video decoder) test patterns1-1. Getting the test patterns displayedPut the screen in AV1

LC-20B1U17No. Pin name Function1 V HOLD2 HLF3 MAIN SW4 TIMELED5 M/S OUT6 CSYNC7 IREMI8 GND9 GND10 XCIN11 XOUT12 RESET13 XOUT14 GND15 XIN16 VCC17 OSCIN

LC-20B1U18Adjustment process mode menus at a glancePage ItemInitial settingFunction Adjust/modify1 INCH SIZE 20 Inch size select AdjustmentMODEL B1U M

LC-20B1U19Page ItemInitial settingFunction Adjust/modify6 I2C DATA 0 I2C bus control IC data write & readIC2 DATA WAIT Write & read executionC

LC-20B1U2CAUTION: FOR CONTINUEDPROTECTION AGAINST A RISK OFFIRE REPLACE ONLY WITH SAMETYPE F3701 (2A, 125V), F3702(1.6A, 125V), F6700 (1A, 125V),F670

LC-20B1U20Page ItemInitial settingFunction Adjust/modify11 PAL AV COLOR 2500 Color density setting (composite, S video)PAL AV TINT +56 Color tone sett

LC-20B1U21Page ItemInitial settingFunction Adjust/modify16 AFT UP 2.7 AFT reference voltageAFT DOWN 1.8 AFT reference voltageNTSC 01 8C Initial settin

LC-20B1U22Page ItemInitial settingFunction Adjust/modify18 V255 255 Gradation power reference voltageV255 BIAS 127 Gradation power reference voltageV2

LC-20B1U23Page ItemInitial settingFunction Adjust/modify22 VPC SYNC 0D8 Card mode sync settingOSD -30 Card mode OSD position settingCARD 01 8C Initial

LC-20B1U24TROUBLE SHOOTING TABLENoNo Power (Power LED indicator still in red)Go to the adjustment process mode.Move the cursor to ERROR NO RESET and c

LC-20B1U25Check all the settings on the microprocessor’s adjust process menu.No pictureNo picture at allYesNoAre inputs and outputs of IC801 as specif

LC-20B1U26No picture and soundYesNoDo F3701and F3702 function?Check all the settings on the microprocessor’s adjust process menu.NoAre secondary outpu

LC-20B1U27No colorNo TV colorNo S-VIDEO colorNoIs input at Pin (71) of IC801 as specified?Check SC3405, SC line and peripheral parts.No VIDEO colorChe

LC-20B1U28No sound from speakersYesNoIs Pin (53) of IC2001 at “L”?Check all the settings on the microprocessor’s adjust process menu.No soundNo Are ou

LC-20B1U29Chek all the setting on the microprocessor's adjustment process menu.Card does not playbackYesYesNo No Is "PC card does not insert

LC-20B1U3PRECAUTION: POUR LAPROTECTION CONTINUE CONTRELES RISQUES D'INCENDIE,REMPLACER LE FUSIBLE PAR UNFUSIBLE DE MEME TYPE F3701 (2A,125V), F37

87109654321AB CDEFGHLC-20B1U30CHASSIS LAYOUTCONTROL UNITDIGTAL UNITANALOG UNITRC/LED UNIT

1716 1918151413121110LC-20B1U31INVERTER-A UNITINVERTER-B UNIT

87109654321AB CDEFGHLC-20B1U32BLOCK DIAGRAM6 LAMPSLAMPS(UP)INVERTERQ6700, Q6701T6700, T6701Q6703, Q6704T6702, T6703Q6706, Q6707T6704, T6705AV1S-VIDEOI

1716 1918151413121110LC-20B1U33YLCDPANELVIDEODECODER(VPC)IC801MPUIC2001E2PROMIC2004RESETIC20023.3VREG.IC9013.3V REG.IC702DEOTCH402FIFOIC1202LCDCONTROL

LC-20B1U34VOLTAGE MEASUREMENT CONDITION:1. Voltages at test points are measured on exclusiveAC adapter or the stable supply voltage of AC 120V.Signal

LC-20B1U35654321ABCDEFGHSCHEMATIC DIAGRAMËCONTROL and RC/LED Unit

87109654321AB CDEFGHLC-20B1U36ËDIGITAL Unit-1/5

1716 1918151413121110LC-20B1U37

87109654321AB CDEFGHLC-20B1U38ËDIGITAL Unit-2/5

1716 1918151413121110LC-20B1U39

LC-20B1U4Precautions for using lead-free solder1 Employing lead-free solder"Digital PWB" of this model employs lead-free solder. The LF symb

87109654321AB CDEFGHLC-20B1U40ËDIGITAL Unit-3/5

1716 1918151413121110LC-20B1U41

87109654321AB CDEFGHLC-20B1U42ËDIGITAL Unit-4/5

1716 1918151413121110LC-20B1U43

87109654321AB CDEFGHLC-20B1U44ËDIGITAL Unit-5/5

1716 1918151413121110LC-20B1U45

87109654321AB CDEFGHLC-20B1U46ËANALOG Unit-1/2

1716 1918151413121110LC-20B1U47

87109654321AB CDEFGHLC-20B1U48ËANALOG Unit-2/2

1716 1918151413121110LC-20B1U49

LC-20B1U5SpecificationsItemsLC-20B1UModelLCD panel 19.7" Advanced Super View & BLACK TFT LCDNumber of dots 921,600 dots VGAVideo color syst

LC-20B1U50654321ABCDEFGHËINVERTER-A Unit

LC-20B1U51654321ABCDEFGHËINVERTER-B Unit

LC-20B1U52654321ABCDEFGHPRINTED WIRING BOARD ASSEMBLIESCONTROL Unit (Side-A)DIGITAL Unit (Side-A)

LC-20B1U53654321ABCDEFGHCONTROL Unit (Side-B)DIGITAL Unit (Side-B)

LC-20B1U54654321ABCDEFGHINVERTER-B Unit (Side-A)INVERTER-A Unit (Side-A)RC/LED Unit (Side-A)

LC-20B1U55654321ABCDEFGHANALOG Unit (Side-A)

LC-20B1U56Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeRef. No. Part No. ★ Description CodeRef. No. Part No. ★ Description

LC-20B1U57Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeQ1203 VSDTC144EE/-1 J DTC144EE AAQ1204 VS2SA1037KQ-1 J 2SA1037KQ AA

LC-20B1U58Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeC1116 VCKYCY1EF104Z J 0.1 25V Ceramic AAC1117 VCCCCY1HH560J J 56p 5

LC-20B1U59Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeC7701 VCEASM0JN476MY J 47 6.3V Electrolytic ADC7702 VCKYCY1EF104Z J

LC-20B1U6Operation ManualTV/VIDEO, CH ( )/( ), VOL ( )/(+), and MENU on the main unit have the same functions as the same buttonson the remote control

LC-20B1U60Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeR1168 VRS-CY1JF103F J 10k 1/16W Metal Oxide AAR1169 VRS-CF1JP333JY

LC-20B1U61Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeR7045 VRS-CY1JF473J J 47k 1/16W Metal Oxide AAR7046 VRS-CY1JF182J J

LC-20B1U62Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodePACKGED CIRCUITX3301 RCRSB0307CEZZ J Crystal AGCOILSL3201 VP-1M220J

LC-20B1U63Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeC3732 RC-KZ1025CEZZ J 1 10V Ceramic ABC3733 RC-KZ1025CEZZ J 1 10V C

LC-20B1U64Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeR3718 VRS-CE3AF821JY J 820 1W Metal Oxide ACR3721 VRS-CY1JF000J J 0

LC-20B1U65Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeDUNTKB132DE01INVERTER-A UNITTRANSISTORSQ6700 VSFZT1053A/-1 J FZT105

LC-20B1U66CABINET AND MECHANICAL PARTS654321ABCDEFGHDCEHG12282520203035303026212427313031332034341417342266-16-36-2INVERTER-A UNIT322-2192-12783229DIG

LC-20B1U67Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeCABINET AND MECHANICAL PARTS1 CCABAA026WJ01 J Front Cabinet Ass&apo

LC-20B1U68Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description CodeSUPPLIED ACCESSORIESLHLDW0109CESA J Cable Calmp, x2 ADå QACCD3097CE

LC-20B1U69PACKING OF THE SET★ Packing Case (SPAKCA054WJZZ)★ Buffer Material (Top and Bottom)(SPAKXA050WJZZ)★ Polyethylene Bag (SPAKPA001WJZZ)Oper

LC-20B1U7Listening with HeadphonesBefore connecting a connection cord into the rearterminal, remove the back cover. Push in the tab andpull out the ba

LC-20B1UCOPYRIGHT © 2002 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication may be reproduced,stored in a retrieval system, or transm

LC-20B1U8DimensionsUnit: inch/mmPOWERINPUTDC12VANT.HEADPHONES-VIDEORAUDIOVIDEOAV-IN1LAV-IN 2/OUTCOMPONENTRAUDIOVIDEOLRAUDIOLPRPBYCHVOL TV/VIDEOMENU MA

LC-20B1U9REMOVING OF MAJOR PARTS1. Remove the two back covers.2. Remove the table stand fixing screws (4 pcs.).3. Rear cabinet is detached opening som