LC-20B1U SERVICE MANUAL S52i8LC-20B1U LCD COLOR TELEVISION POWER SLEEP MODEL LC-20B1U 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 » IMPORTANT SERVICE SAFETY PRECAUTION.................................................... 2 » SPECIFICATIONS ............................................. 5 » OPERATION MANUAL .................................
LC-20B1U IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be perfomed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: ground, such as electrical conduit or electrical ground connected to an earth ground. • Use an AC voltmeter having with 5000 ohm per volt, or higher, sensitivity or measure the AC voltage drop across the resisor.
LC-20B1U PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ë Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. conduite électrique ou une prise de terre branchée à la terre. • Utiliser un voltmètre CA d'une sensibilité d'au moins 5000ohm/V pour mesurer la chute de tension en travers de la résistance.
LC-20B1U Precautions for using lead-free solder 1 Employing lead-free solder "Digital PWB" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder. Example: LFa Indicates lead-free solder of tin, silver and copper. 2 Using lead-free wire solder When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder.
LC-20B1U Specifications Items LC-20B1U Model LCD panel Number of dots Video color systems Destination TV Standard (CCIR) TV function TV Tuning System STEREO CATV 3 Dimensional Y/C separation circuit Digital comb filter Brightness Lamp life Viewing angles Audio amplifier Speakers AV1 AV2 Terminals COMPONENT Antenna Headphone PC Card slot Image File Format OSD language Power consumption Power supply Weight Accessories 19.
PC Card slot MENU CH ( )/( ) VOL ( - )/(+) MAIN POWER TV/VIDEO To change the vertical angle of the LCD TV set, tilt the screen up to 5 degrees forward or 10 degrees backward. The TV set can also be rotated 50 degrees horizontally. Please adjust the angle so that the TV set can be watched most comfortably. The SLEEP indicator lights up red when the SLEEP TIMER is set to on.
MAIN POWER 7 Headphones Rear terminal VOLUME 60 On-screen display Headphones are not included in the supplied accessories. No sound will be heard from the main unit speakers when a headphone mini-plug is connected into the HEADPHONE jack. CH Note VOL Plug the headphone mini-plug into the HEADPHONE jack located on the rear of the TV set.
LC-20B1U VOL CH MENU TV/VIDEO 2-55/64 / 72.6 2-5/8 / 66.6 1-37/64 / 40 Dimensions MAIN POWER 12-9/16 / 319 24-51/64 / 630 11-49/64 / 298.8 7-13/32 / 188 15-1/64 / 381.5 193.5 7-5/8 / 18-41/64 / 473.5 15-51/64 / 401.3 14-59/64 / 379 4-7/32 / 107.3 2-55/64 / 72.6 1.5 VIDEO AV-IN 2/OUT L AUDIO R COMPONENT Y PB 1/16 / 3-15/16 / 100 3-7/16 / 87.5 18-29/64 / 468.8 1-37/64 / 40 VIDEO AV-IN1 L AUDIO R S-VIDEO HEAD PHONE ANT. PR 3-15/16 / 100 L AUDIO R POWER INPUT DC12V 1-13/64 / 30.
LC-20B1U REMOVING OF MAJOR PARTS 1. Remove the two back covers. 2. Remove the table stand fixing screws (4 pcs.). 3. Rear cabinet is detached opening some rear cabinet and shifting to a PC card slot side, where a card release button is pushed in. 4. Remove the reinforcement angle fixing screws (4 pcs.). 5. Remove the PC card unit. 3 5-1. Detach the connector. 5-2. Remove the PC card frame angle fixing screws (2 pcs.). 3 5-3. Remove the ground cable fixing screws (3 pcs.). 6.
LC-20B1U 7. 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 screws (1 pc.). 10. Undo the hooks and slide the chassis frame cover out of position. 11. Remove the analog PWB fixing screws (3 pcs.). 12. Remove the RC/LED PWB fixing screws (2 pcs.). 13. Remove the control PWB fixing screws (2pcs.).
LC-20B1U » Precautions in handling the LCD panels 1. Work in a clean room (with humidities below 50%). 2. Be sure to wear an anti-static armband. 3. Handle the panels on an electroconductive mat. 4. Be careful not to fall, shake and shock the panels. 14.Remove the four screws and open the LCD display unit. 15.Remove the ITO earth angle fixing screw (1 pcs.). 16.Detach the reflection/deflection, prism, diffusion, ITO sheets and diffusion plate. 17.Remove the lamp holder fixing screws (6 pcs.). 18.
LC-20B1U Notes at the time of the side B(back) service of a digital unit 6. 7. 8. 1 1 3 DIGITAL Unit (side B) 3 8 DIGITAL Unit P2003 P2004 5 P3702 6 4 SC2001 PC card slot SC901 2 SC3403 5. Remove PC card slot attachment angle fixed screws(2 pcs.). Remove the FFC from a PC card unit. Remove the grounding cable fixed screws(2 pcs.). Remove the FFC for connection between digital unit (SC2001) and analog unit (SC3403), and connect the extension FFC for service(QCNW-A324WJZZ).
LC-20B1U ADJUSTING PROCEDURE OF EACH SECTION The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust as follows. 1. Preparation for Adjustments (1)Use the exclusive-use AC adapter or stable DC power supply. AC adapter: UADP-0243CEPZ DC power supply: 13 ± 0.5V 2. Special mode setting procedure (1)After initialization of E2PROM the mode is changed to the adjustment mode. [Procedure] Connect TP2001 and TP2002 to GND, and turn on the power.
LC-20B1U 4. Adjustments Adjustment Adjusting conditions Adjusting method 1 B+ Adjustment (R3760) 1. Connect the DC voltmeter to pin 2 of P3702. 1. Adjust the "B+ Adj" value to 5.0 ±0.02V with R3760. Make exact adjustment of the 5.00 V level because it will be the reference for all the other supply voltages. Be sure to make this adjustment together with the main PWB (digital PWB). During the adjustment, be also careful not to allow the voltage at pin (2) of P3702 to go above 5.3 V.
LC-20B1U 5. Shipping setting list Channel ............................................................................................................................................... 2ch Air/Cable ............................................................................................................................................. Air Skip Data_CATV .................................................................................................................................
LC-20B1U Test patterns in adjustment process mode [1] IC801 (Video decoder) test patterns 1-1. Getting the test patterns displayed Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode, select “TEST PATTERN” in the 3rd line of page 7, make the settings 1 thru 6, and the following test patterns show up. 1-2. Test patterns » Setting 1 Cyan Magenta Yellow green Blue Red Green Magenta Cyan Green Yellow The color bars are displayed as shown at left.
LC-20B1U Pin functions of microprocessor IC (IC2001) RH-iXA276WJZZQ No.
LC-20B1U Adjustment process mode menus at a glance Page Item Initial setting Function Adjust/modify Basic settings 1 INCH SIZE 20 Inch size select MODEL B1U Model number CARD ON SYSTEM N358 Color system select NTSC PWN FREQ OCO Dimmer frequency setting PAL PWM FREQ OBD Dimmer frequency setting NTSC PWM DUTY 0 Dimmer duty setting PAL PWM DUTY 0 Dimmer duty setting TV GAIN OFF Auto gain setting in TV mode ERROR NO RESET 0 Lamp error count & reset V-CHIP 1 VCHIP line mute setting CANADIAN VCHIP OFF Canadia
LC-20B1U Page Item Initial setting Function Adjust/modify Video adjustments (VPC settings) 6 I2C DATA IC2 DATA CBW NOSEL DDR HDG VDG VPK KILVL 08 KILHY 05 VSYNC DELAY DVCO AUTO LCK 0 WAIT 1 3 1 3 0 0 08 05 29 -720 1 I2C bus control IC data write & read Write & read execution Chroma band pass setting Comb filter setting Comb filter setting Comb filter setting Comb filter setting Comb filter setting Color killer level setting Color killer hysteresis setting V sync phase setting DVCO setting Line lock mo
LC-20B1U Page Item Initial setting Function Adjust/modify Video adjustments (TV, composite & S video) 11 12 13 14 15 PAL AV COLOR PAL AV TINT PAL BRIGHTNESS PAL PEAKING FILTER PAL AV H-PEAKING PAL AVO START PAL SFIF PAL SCINC1 PAL AV LDLY SECAM AV COLOR SECAM AV TINT SECAM BRIGHTNESS SECAM PEAKING FILTER SECAM AV H-PEAKING SECAM AVO START SECAM SFIF SECAM SCINC1 SECAM AV LDLY PAL-M TV COLOR PAL-M AV COLOR PAL-M TV TINT PAL-M AV TINT PAL-M BRIGHTNESS PAL-M PEAKING FILTER PAL-M TV H-PEAKING PAL-M AV H
LC-20B1U Page Item Initial setting Function Adjust/modify Search AFT reference & LCD controller settings 16 17 AFT UP AFT DOWN NTSC 01 NTSC 02 NTSC 03 NTSC 04 NTSC 05 NTSC 06 NTSC 07 NTSC 08 NTSC 09 NTSC 0A NTSC 10 NTSC 11 NTSC 12 NTSC 13 NTSC E0 NTSC E1 NTSC F0 NTSC F1 NTSC F2 NTSC F3 NTSC F4 NTSC F5 NTSC F6 NTSC F7 NTSC 14 G/A TEST PATERN PAL 01 PAL 02 PAL 03 PAL 04 PAL 05 PAL 06 PAL 07 PAL 08 PAL 09 PAL 0A PAL 10 PAL 11 PAL 12 PAL 13 PAL E0 PAL E1 PAL F0 PAL F1 PAL F2 PAL F3 PAL F4 PAL F5 PAL F6 PAL
LC-20B1U Page Item Initial setting Function Adjust/modify Gradation & COM settings 18 19 V255 V255 BIAS V235 V235 BIAS V176 V176 BIAS V112 V112 BIAS V64 V64 BIAS V32 V32 BIAS V21 V21 BIAS V17 V17 BIAS V7 V7 BIAS V0 V0 BIAS VGL ADJ VGL COM COM G/A READDATA G/A READDATA 255 127 222 127 130 150 96 170 65 40 72 100 45 50 52 145 27 65 0 80 27 215 179 00 00 WAIT Gradation power reference voltage Gradation power reference voltage Gradation power reference voltage Gradation power reference voltage Gradation
LC-20B1U Page Item Initial setting Function Adjust/modify Card mode LCD controller setting 22 VPC SYNC OSD CARD 01 CARD 02 CARD 03 CARD 04 CARD 05 CARD 06 CARD 07 CARD 08 CARD 09 CARD 0A CARD 10 CARD 11 CARD 12 CARD 13 CARD E0 CARD E1 CARD F0 CARD F1 CARD F2 CARD F3 CARD F4 CARD F5 CARD F6 CARD F7 CARD 14 0D8 -30 8C C4 81 00 81 0B 14 00 4C 4B 80 00 00 00 00 03 07 00 00 C0 00 00 00 00 03 Card mode sync setting Card mode OSD position setting Initial setting Various setting RCUTOFF GCUTOFF BCUTOFF Horizo
Check IC801 and its peripheral circuits. Check the IC801 signal input line. No Check the related lines, IC801 itself and its peripheral circuits. Are the waveforms at pins (10), (11), (13), (15) and (17) of IC1201 as specified? Yes No No Check IC1201 and its peripheral circuits as well as the LCD panel voltage and waveform. Check the IC801 signal output line, IC801 itself and its peripheral circuits.
No TV output 25 Are inputs and outputs of IC801 as specified? Yes No Check IC402 and its peripheral parts. Check IC801 and its peripheral circuits. Does the video decoder No test pattern appear? Yes Check IC1201, its peripheral circuits and the LCD panel. Does the LCD controller test No pattern appear? No Check IC402 and its peripheral parts.
Check the secondary-side load of T3701. Yes Are the oscillation waveform at T3701’s primary side as specified? No Are secondary outputs (+38V, +9V, +5V, -8V, -20V) of T3701 as specified? Yes Do F3701and F3702 function? No No Check J3701, its peripheral parts and connection cable. Yes Is any of T3701’s primary No side, Q3700 and S4701 shortcircuited? Yes Disconnect F3701and F3702. Is the load side short-circuited? Check all the settings on the microprocessor’s adjust process menu.
No VIDEO color Check all the settings on the microprocessor’s adjust process menu. No TV color No color Check SC3405, SC line and peripheral parts. No Is input at Pin (71) of IC801 as specified? No S-VIDEO color Check J3404, PB line, PR line and peripheral parts.
No sound from headphone 28 Check the speakers and their peripheral parts. Yes Are inputs at Pins (2) and (4) as well as outputs at Pins (8) and (12), all of IC3305, as specified? Yes Are outputs at Pins (1) and (7) of IC3301/ IC3302/ IC3303 as specified? Yes Are input and output of IC3304 as specified? Yes Is Pin (53) of IC2001 at “L”? No No No No Check the line in question, IC3301 and its peripheral parts. Check IC3301, IC3302, IC3303 and their peripheral parts.
File format is not correct. Yes Is "PC card does not insert" displaed on OSD? Yes 29 Check the PC card unit. Yes Are input and output of each terminal of pins (15) and (28) of IC801 normal? Yes Is pin(49) of IC2001 at "L"? Yes Is each terminal voltage of pins (46) and (40) of SC901 normal? pin(46)....3.3V pin(40)....5.0V No No No Chek all the setting on the microprocessor's adjustment process menu. Card does not playback Check the line in question. Check the line in question.
LC-20B1U CHASSIS LAYOUT CONTROL UNIT H DIGTAL UNIT G F E ANALOG UNIT D C B RC/LED UNIT A 1 2 3 4 5 6 30 7 8 9 10
LC-20B1U INVERTER-A UNIT INVERTER-B UNIT 10 11 12 13 14 15 31 16 17 18 19
LC-20B1U BLOCK DIAGRAM H ANALOG UNIT I2C TUNER TU3201 TV-V SIF SY, SC V1 L1, R1 AV1 S-VIDEO INPUT G SIF-AMP. Q3201 Q3202 V2/VO AV2 INPUT OUTPUT AUDIO IN/OUT SWITCH IC3501 Q3500 L2, R2 TV-V V1 V2 V2 VIDEO IN/OUT SWITCH Q3501-Q3505 VIDEO SWITCH IC402 VOUT V S I 6 d B AMP. IC7201 F Y, PB, PR COMPONENT INPUT DL, DR AUDIO DECODER (MSP) IC3304 DC IN DC13V E AUDIO FILTER IC3301 IC3302 IC3303 I2C SYNC SEPARATER.
LC-20B1U DIGITAL UNIT I2C SYOUT, SCOUT Y and C SWITCH IC7101 REGULATOR IC7102 3D Y/C SEPARATOR IC7001 IC7002 YO, CO REGULATOR IC7701 V1SY, V1SC PC CA RD UNIT 3.3VREG. IC901 RESET IC7004 SUBDIN,SUBDOUT SY, SC DEO TCH 402 AV1 V V1SY I2C BUFFER IC903 CK,HBLK,VBLK FLD, VOUT VIDEO SWITCH IC7202 AMP. 201 VIDEO DECODER (VPC) IC801 LCD CONTROLLER IC1201 C DY Y LCD PANEL DY DY, PB, PR FIFO IC1202 3.3V REG.
LC-20B1U DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: CAUTION: 1. Voltages at test points are measured on exclusive AC adapter or the stable supply voltage of AC 120V. Signals are fed by a color bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester. This circuit diagram is original one, therefore there may be a slight difference from yours.
LC-20B1U SCHEMATIC DIAGRAM ËCONTROL and RC/LED Unit H G F E D C B A 1 2 3 4 35 5 6
LC-20B1U Ë DIGITAL Unit-1/5 H G F E D C B A 1 2 3 4 5 6 36 7 8 9 10
LC-20B1U 10 11 12 13 14 15 37 16 17 18 19
LC-20B1U Ë DIGITAL Unit-2/5 H G F E D C B A 1 2 3 4 5 6 38 7 8 9 10
LC-20B1U 10 11 12 13 14 15 39 16 17 18 19
LC-20B1U Ë DIGITAL Unit-3/5 H G F E D C B A 1 2 3 4 5 6 40 7 8 9 10
LC-20B1U 10 11 12 13 14 15 41 16 17 18 19
LC-20B1U Ë DIGITAL Unit-4/5 H G F E D C B A 1 2 3 4 5 6 42 7 8 9 10
LC-20B1U 10 11 12 13 14 15 43 16 17 18 19
LC-20B1U Ë DIGITAL Unit-5/5 H G F E D C B A 1 2 3 4 5 6 44 7 8 9 10
LC-20B1U 10 11 12 13 14 15 45 16 17 18 19
LC-20B1U Ë ANALOG Unit-1/2 H G F E D C B A 1 2 3 4 5 6 46 7 8 9 10
LC-20B1U 10 11 12 13 14 15 47 16 17 18 19
LC-20B1U Ë ANALOG Unit-2/2 H G F E D C B A 1 2 3 4 5 6 48 7 8 9 10
LC-20B1U 10 11 12 13 14 15 49 16 17 18 19
LC-20B1U Ë INVERTER-A Unit H G F E D C B A 1 2 3 4 50 5 6
LC-20B1U Ë INVERTER-B Unit H G F E D C B A 1 2 3 4 51 5 6
LC-20B1U PRINTED WIRING BOARD ASSEMBLIES H G F CONTROL Unit (Side-A) E D C B A DIGITAL Unit (Side-A) 1 2 3 4 52 5 6
LC-20B1U H G F CONTROL Unit (Side-B) E D C B A DIGITAL Unit (Side-B) 1 2 3 4 53 5 6
LC-20B1U H G F INVERTER-A Unit (Side-A) E D C INVERTER-B Unit (Side-A) B A RC/LED Unit (Side-A) 1 2 3 4 54 5 6
LC-20B1U H G F E D C B ANALOG Unit (Side-A) A 1 2 3 4 55 5 6
LC-20B1U Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code PARTS LIST LISTE DES PIECES PARTS REPLACEMENT CHANGE DES PIECES 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.
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LC-20B1U Ref. No. ★ Part No. Description Code Ref. No. DUNTKA670FE24 DIGITAL UNIT (Continued) C7701 VCEASM0JN476MY J 47 C7702 VCKYCY1EF104Z J 0.1 6.
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LC-20B1U CABINET AND MECHANICAL PARTS 31 4-1 H 28 4-2 4 4-3 12 4-4 11 4-5 CONTROL UNIT D 1-3 31 1-5 G INVERTER-A UNIT 1-9 1-6 1-12 30 1-8 25 1-5 D 1-3 26 1-3 1-4 1-7 1-11 30 21 1-6 1-9 1-12 1-11 E DIGITAL UNIT C INVERTER-B UNIT 1-8 20 30 1-10 F H 27 1-7 20 24 G 35 1-4 1-3 E 15 31 31 RC/LED UNIT 10 1-1 30 1-2 23 9 5-4 16 ANALOG UNIT E 31 1 6 5-10 5-7 5 5-20 5-5 5-3 C G 6-1 PC CARD UNIT 33 22 6-3 6-2 5-2 34 D 20 5-19 5-12 5-11 13 F 34 14 5-
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LC-20B1U PACKING OF THE SET Operation Manual (TiNS-A109WJZZ) Cable Clamp (2 pcs.) (LHLDW0109CESA) ★ Dry Battery (2 pcs.
LC-20B1U COPYRIGHT © 2002 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. TQ1318-S May. 2002 Printed in Japan D Japan P Japan NA.
