Sharp LC-20VM2E Service Manual
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Sharp LC-20VM2E Service Manual

Sharp LC-20VM2E Service Manual

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LC-121M2E
LC-150M2E
1. IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................... 2
2. SPECIFICATIONS ................................................................................................................................... 3
3. PART NAMES .......................................................................................................................................... 4
4. OUTLINE DIMENSION FIGURE .............................................................................................................. 5
5. REMOVING THE MAIN PARTS ............................................................................................................... 6
6. LC-20VM2 ADJUSTING METHOD .......................................................................................................... 8
7. INTEGRATED CIRCUIT TERMINAL ARRANGEMENTS ........................................................................ 20
8. TROUBLE SHOOTING ............................................................................................................................ 29
9. CHASSIS LAYOUT .................................................................................................................................. 32
10. SCHEMATIC DIAGRAMS ........................................................................................................................ 36
11. BLOCK DIAGRAM ................................................................................................................................... 52
12. PRINTED WIRING BOARD ASSEMBLIES .............................................................................................. 54
13. PARTS LIST ............................................................................................................................................. 63
14. PACKING OF THE SET ........................................................................................................................... 78
The component parts of this model are partially different
depending on their suffix symbols. Before servicing the
units, be sure to check the suffix symbol on the model
label that is applied on the bottom side of the unit.

SERVICE MANUAL

MODEL
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
CONTENTS
SHARP CORPORATION
1
LCD AV MONITOR
LC-20VM2E
Suffix symbol ( , K , X )
LC-20VM2E
LC-20VM2E
SX9S3LC20VM2E
Page

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  • Page 1: Table Of Contents

    LC-121M2E LC-20VM2E LC-20VM2E LC-150M2E SERVICE MANUAL SX9S3LC20VM2E LCD AV MONITOR LC-20VM2E MODEL In the interests of user-safety (Required by safety regula- tions in some countries) the set should be restored to its original condition and only parts identical to those specified be used.

  • Page 2: Important Service Safety Precaution

    LC-20VM2E LC-121M2E LC-150M2E 1. IMPORTANT SERVICE SAFETY PRECAUTION æ Service work should be perfomed only by qualified service technicians who are thoroughly familiar with all safety checks and servicing guidelines which follow: WARNING Any reading of 0.3V RMS(this corresponds to 0.2 milliamp. AC.) or more is excessive and 1.

  • Page 3: Specifications

    LC-121M2E LC-20VM2E LC-150M2E 2. SPECIFICATIONS Type: LCD display unit (LCD color AV monitor) Size: 20" type (298.8 mm × 401.3 mm) Display System: Transmitting type TN liquid crystal panel. Driving System: TFT (Thin Film Transistor) active matrix system Number of Picture Elements: 885,120 (640 (H) × 3 (RBG) × 461 (V)) Speaker Output: 4.0 W (Front 0.7W + 0.7W, Rear 2.6W)

  • Page 4: Part Names

    LC-20VM2E LC-121M2E LC-150M2E 3. PART NAMES...

  • Page 5: Outline Dimension Figure

    LC-121M2E LC-20VM2E LC-150M2E 4. OUTLINE DIMENSION FIGURE...

  • Page 6: Removing The Main Parts

    LC-20VM2E LC-121M2E LC-150M2E 5. REMOVING THE MAIN PARTS 1. Remove the four main PWB fixing screws. 2. Remove the three inverter PWB fixing screws. 3. Remove the four RGB terminal PWB fixing screws. 4. Remove the one terminal PWB fixing screw and 1 earth fixing screw to remove the reinforcing plate.
  • Page 7 LC-121M2E LC-20VM2E LC-150M2E • Caution for handling the LCD panel 7. Remove the four LCD unit front fixing screws and 4 rear 1. Work in a clean room. (Humidity: 50% or more) fixing screws to remove the shield plate. 2. A worker must wear arm bands.

  • Page 8: Lc-20Vm2 Adjusting Method

    LC-20VM2E LC-121M2E LC-150M2E 6. LC-20VM2 ADJUSTING METHOD The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust as follows. 6-1. Preparation for adjustment (1)Use the exclusive-use AC adapter or stable DC power supply.
  • Page 9 LC-121M2E LC-20VM2E LC-150M2E 6-4. OSD menu indication and items in case of manual adjustment Adjusting range Page Item Minimum Maximum Initial Remarks + B – ADJ MODEL VM2U VM1/VM2E/VM2U NTSC/PALM OSC PAL/SECAM OSC ERROR NO Number of the error detection...
  • Page 10 LC-20VM2E LC-121M2E LC-150M2E PAL-M BRIGHTNESS PAL-M UNICOLOR PAL-M SCOLOR PAL-M TINT PAL BRIGHTNESS PAL UNICOLOR PAL SCOLOR PAL TINT SECAM BRIGHTNESS SECAM UNICOLOR SECAM SCOLOR SECAM TINT DVD 60 BRIGHTNESS DVD 60 UNICOLOR DVD 60 COLOR DVD 60 TINT DVD 50 BRIGHTNESS...
  • Page 11 LC-121M2E LC-20VM2E LC-150M2E N358 R-Y PHASE N358 B-Y PHASE N443 R-Y PHASE N443 B-Y PHASE PAL-M R-Y PHASE PAL-M B-Y PHASE PAL R-Y PHASE PAL B-Y PHASE SECAM R-Y PHASE SECAM B-Y PHASE COLOR SCONT SPEED 9600 600/1200/2400/4800/9600/19.2k PARITY NONE...
  • Page 12 LC-20VM2E LC-121M2E LC-150M2E 6-6. Service Adjusting 6-6-1. Main chassis adjustment Adjustment Adjusting conditions Adjusting method +B Adjustment 1. Connect the DC voltmeter to 1. Adjust the DC/DC 5V line output (+B ADJ Item) TP1101 voltage so as to get 5.0±0.05V.
  • Page 13 LC-121M2E LC-20VM2E LC-150M2E B CUTOFF adjustment 1. Input the NTSC standard color bar 1. Adjust B CUTOFF so as to equalize (B CUTOFF Item) to AV1. the black levels of green and blue. 2. Connect CH1 of the oscilloscope to TP821 (IC316, pin7, G output).
  • Page 14 LC-20VM2E LC-121M2E LC-150M2E 6-6-3. PAL signal adjustment Adjustment Adjustment conditions Adjustment method PAL/SECAM OSC 1. Input the PAL standard color bar 1. Adjust PAL/SECAM OSC so that adjustment to AV1. the screen becomes clear. (PAL/SECAM OSC) Brightness adjustment 1. Input the PAL standard color bar 1.
  • Page 15 LC-121M2E LC-20VM2E LC-150M2E 6-6-4. SECAM signal adjustment Adjustment Adjustment conditions Adjustment method BELL f0 adjustment 1. Connect the oscilloscope to 1. Adjust BELL f0 so that the level of (BELL F0) TP2851. a becomes the minimum. Brightness adjustment 1. Input the SECAM standard color bar 1. Adjust SECAM BRIGHTNESS, and (SECAM BRIGHTNESS) to AV1.
  • Page 16 LC-20VM2E LC-121M2E LC-150M2E 6-6-6. N443, PAL-M signal adjustment (Actual adjustment manipulation is unnecessary because PAL data is copied by the data copy manipulation of the former term. Adjustment Adjusting conditions Adjusting method Brightness adjustment 1. Input the NTSC standard color bar 1.
  • Page 17 LC-121M2E LC-20VM2E LC-150M2E 6-6-7. Component (50/60Hz) input adjustment Adjustment Adjusting conditions Adjusting method Brightness adjustment 1. From SG, input the 100% white color 1. Adjust DVD 50/60 BRIGHTNESS, and (DVD 50/60 BRIGHTNESS bar signal of PAL into conponent adjust the black level of G output so Item) terminal.
  • Page 18 LC-20VM2E LC-121M2E LC-150M2E RGB Contrast adjustment 1. Input the test pattern to RGB. 1. Adjust RGB CONTRAST so as to (RGB CONTRAST Item) 2. Connect the oscilloscope to TP821 get 2.5±0.1Vp-p between the 100% (IC316, pin7, G output). white and GND.
  • Page 19 LC-121M2E LC-20VM2E LC-150M2E (2)PAL finished adjustment Adjustment Adjusting conditions Adjusting method Black level adjustment 1. Set is set in the compulsion PAL 1. It confirms that the third gradation is (The 14th-page PAL mode. a cut-off point from the left of the BRIGHTNESS Item) 2.

  • Page 20: Integrated Circuit Terminal Arrangements

    LC-20VM2E LC-121M2E LC-150M2E 7. INTEGRATED CIRCUIT TERMINAL ARRANGEMENTS 7-1. IC2001 (QFP, 80pins) MICRO CONTROLER Terminal No. Terminal name Function Type N. C – — N. C – — C bus serial clock line C bus serial data line H PDET...
  • Page 21 LC-121M2E LC-20VM2E LC-150M2E PALM “H” in PALM mode, “L” in other modes. N. C – — N. C – — N. C – — Black and white: H, Others: L N. C – — N. C – — N. C –...
  • Page 22 LC-20VM2E LC-121M2E LC-150M2E 7-2. IC1201 LCD CONTROLER Terminal No. Symbol I/O Voltage Function block Function OSD_BK OSD Blanking input (FB SW) OSD_R OSD R signal input OSD_G OSD G signal input OSD_B OSD B signal input OSDVD OSD V output...
  • Page 23 LC-121M2E LC-20VM2E LC-150M2E Terminal No. Symbol I/O Voltage Function block Function HDCK LCD TIMING Not used I =3.0mA LCD TIMING SOURCE driver clock I =3.0mA OOB7 RGB gradation process BLUE signal output (MSB) OOB6 RGB gradation process OOB5 RGB gradation process...
  • Page 24 LC-20VM2E LC-121M2E LC-150M2E Terminal No. Symbol I/O Voltage Function block Function TST7 Test signal(Internal PD) TST6 Test signal(Internal PD) TST5 Test signal(Internal PD) TST4 Test signal(Internal PD) A/D clock terminal input/output switching for test TST3 Test signal(Internal PD) TST2 Test signal(Internal PD)
  • Page 25 LC-121M2E LC-20VM2E LC-150M2E 7-3. IC7001 (100pin, QFP) 3D Y/C Terminal Symbol Level Buffer Type Function PU/PD[kΩ] 1, 40, DGND Digital section ground 55,80 45, 64, DVDD Digital section power supply MRAS RAS output for external EDO memory (Active Low) Address output for external EDO memory...
  • Page 26 LC-20VM2E LC-121M2E LC-150M2E Terminal Symbol Level Buffer Type Function PU/PD[kΩ] SLA0 5V withstand C bus slave address selection input voltage (L: B8/B9h, H: BA/BBh) PD:50 Schmitt 5V withstand C bus clock input voltage (Connect to system’s SCL line) Schmitt 5mA/5V C bus data input/output Not Open drain withstand voltage (Connect to system’s SDA line)
  • Page 27 LC-121M2E LC-20VM2E LC-150M2E Terminal Symbol Level Buffer Type Function PU/PD[kΩ] Analog C-ADC bottom reference voltage output Analog C-ADC analog C signal input AGND C-ADC ground 7-4. IC4101 (128pin, QFP) Name TYPE CELL CELL Name TYPE CELL CELL VDD (+5V) PHDEN...
  • Page 28 LC-20VM2E LC-121M2E LC-150M2E Name TYPE CELL CELL Name TYPE CELL CELL RDLIN4 GDLIN4 RDLIN5 GDLIN5 RDLIN6 GDLIN6 RDLIN7 GDLIN7 ETWEN PDVN NCLKIN GNIN0 BNIN0 GNIN1 BNIN1 GNIN2 BNIN2 GNIN3 BNIN3 GNIN4 BNIN4 GNIN5 BNIN5 GNIN6 BNIN6 GNIN7 BNIN7 BDLIN0 BDLIN1...

  • Page 29: Trouble Shooting

    LC-121M2E LC-20VM2E LC-150M2E 8. TROUBLE SHOOTING No picture, No sound Fluorecent lamp failure to light up. Do F702 and F703 function? Does F7751 function? Replace F7751. Remove F702 and F703, and Is the pin 11 of IC1201 in the Check IC1201, IC1206, IC2001 Are T701's secondary outputs, "H"...
  • Page 30 LC-20VM2E LC-121M2E LC-150M2E No sound Does not output from the front Does not output from the rear Does not output from the headphones Does not output from the line output Is the pin 9 of Muted. Check Is the pin 10 Muted.
  • Page 31 LC-121M2E LC-20VM2E LC-150M2E No colour appears No colour appears No colour appears No colour appears (N358) (N443,PAL) (PAL-M) (SECAM) Is 3.5795 MHz Check X801 and Is 4.4336 MHz Check X802 and Is 3.5756 MHz Check X803 and Is 4.4336 MHz...

  • Page 32: Chassis Layout

    LC-20VM2E LC-121M2E LC-150M2E 9. CHASSIS LAYOUT MAIN A MAIN B...
  • Page 33 LC-121M2E LC-20VM2E LC-150M2E RGB UNIT INVERTER UNIT SW UNIT TERMINAL UNIT...
  • Page 34 LC-20VM2E LC-121M2E LC-150M2E • WAVEFORMS 1 500mV/div 3 1V/div 2 1V/div 10µs/div 10µs/div 10µs/div 4 1V/div 6 1V/div 5 1V/div 10µs/div 10µs/div 10µs/div 7 500mV/div 8 1V/div 9 2V/div 10µs/div 10µs/div 10µs/div...

  • Page 35: Description Of Schematic Diagram

    LC-121M2E LC-20VM2E LC-150M2E • DESCRIPTION OF SCHEMATIC DIAGRAM 1. When the exclusive-use AC adapter is used, the color bar signal of color bar generator for service is input to get the normal screen. When the audio is minimized, the voltage value is measured with the 20 kΩ/V tester.

  • Page 36: Schematic Diagrams

    LC-20VM2E LC-20VM2E 10. SCHEMATIC DIAGRAMS MAIN (1) CIRCUIT SCHEMATIC DIAGRAM 36~37...
  • Page 37 LC-20VM2E LC-20VM2E MAIN (2) CIRCUIT SCHEMATIC DIAGRAM å AND SHADED COMPONENTS=SAFETY RELATED PARTS 38~39...
  • Page 38 LC-20VM2E LC-20VM2E MAIN (3) CIRCUIT SCHEMATIC DIAGRAM 40~41...
  • Page 39 LC-20VM2E LC-20VM2E SCAN CIRCUIT SCHEMATIC DIAGRAM 42~43...
  • Page 40 LC-20VM2E LC-20VM2E YC CIRCUIT SCHEMATIC DIAGRAM 44~45...
  • Page 41 LC-20VM2E LC-20VM2E TERMINAL CIRCUIT SCHEMATIC DIAGRAM å AND SHADED COMPONENTS=SAFETY RELATED PARTS 46~47...
  • Page 42 LC-20VM2E INVERTER CIRCUIT SCHEMATIC DIAGRAM å AND SHADED COMPONENTS=SAFETY RELATED PARTS...
  • Page 43 LC-20VM2E SW CIRCUIT SCHEMATIC DIAGRAM...
  • Page 44 LC-20VM2E LC-20VM2E RGB CIRCUIT SCHEMATIC DIAGRAM 50~51...

  • Page 45: Block Diagram

    LC-20VM2E LC-20VM2E 11. BLOCK DIAGRAM 52~53...
  • Page 46 LC-20VM2E LC-20VM2E 12. PRINTED WIRING BOARD ASSEMBLIES MAIN PWB UNIT (Component Side) 54~55...
  • Page 47 LC-20VM2E LC-20VM2E MAIN PWB UNIT (Wiring Side) 56~57...
  • Page 48 LC-20VM2E LC-20VM2E TERMINAL PWB UNIT Component Side Wiring Side 58~59...
  • Page 49 LC-20VM2E LC-20VM2E INVERTER/SW/RGB PWB UNIT INVERTER PWB UNIT SW PWB UNIT Component Side Component Side Wiring Side RGB PWB UNIT Component Side Wiring Side Wiring Side 60~61...
  • Page 50 LC-20VM2E - M E M O -...

  • Page 51: Printed Wiring Board Assemblies

    LC-121M2E LC-20VM2E LC-150M2E 13. PARTS LIST Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 PARTS REPLACEMENT MAIN PWB UNIT Replacement parts which have these special safety character- INTEGRATED CIRCUITS istics identified in this manual: electrical components having...
  • Page 52 LC-20VM2E LC-121M2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 D402 RH-EX0632CEZZ J Zener Diode MAIN PWB UNIT(Continued) D701 VHDDAN222//-1 J DAN222 D702 VHDSFPB56//2E J SFPB56 Q401 VS2SC2412KQ-1 J 2SC2412KQ D703 VHD1SS250//1E J 1SS250...
  • Page 53 LC-121M2E LC-20VM2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 C439 RC-KZ1025CEZZ 10V Ceramic MAIN PWB UNIT(Continued) C440 RC-KZ1025CEZZ 10V Ceramic C441 RC-KZ1025CEZZ 10V Ceramic L2001 VP-1M470J5R4N J Peaking, 47µH C443 VCEAPW1CN477M J 470...
  • Page 54 LC-20VM2E LC-121M2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 C1101 VCCCCY1HH101J J 100p 50V Ceramic MAIN PWB UNIT(Continued) C1103 VCCCCY1HH101J J 100p 50V Ceramic C1104 VCKYTQ1EF105Z 25V Ceramic C828 RC-KZ1025CEZZ 10V Ceramic C1105...
  • Page 55 LC-121M2E LC-20VM2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 C2850 VCCCCY1HH101J J 100p 50V Ceramic MAIN PWB UNIT(Continued) C2851 VCCCCY1HH101J J 100p 50V Ceramic C2852 VCKYCY1HB103K J 0.01 50V Ceramic C1252 VCKYCY1EF104Z J 0.1...
  • Page 56 LC-20VM2E LC-121M2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 R385 VRS-CR3AD391J J 390 1W Metal Oxide AC MAIN PWB UNIT(Continued) R394 VRS-CY1JF223J J 22k 1/16W Metal Oxide AA R401 VRS-CY1JF562J J 5.6k 1/16W Metal Oxide AA...
  • Page 57 LC-121M2E LC-20VM2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 R873 VRS-CY1JF102J J 1k 1/16W Metal Oxide AA MAIN PWB UNIT(Continued) R874 VRS-CY1JF102J J 1k 1/16W Metal Oxide AA R875 VRS-CY1JF180J J 18 1/16W Metal Oxide AA...
  • Page 58 LC-20VM2E LC-121M2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 R1295 VRS-CY1JF330J J 33 1/16W Metal Oxide AA MAIN PWB UNIT(Continued) R1321 VRS-CY1JF000J 1/16W Metal Oxide AA R1801 VRS-CY1JF000J 1/16W Metal Oxide AA R1154...
  • Page 59 LC-121M2E LC-20VM2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 R7025 VRS-CY1JF224J J 220k 1/16W Metal Oxide AA MAIN PWB UNIT(Continued) R7026 VRS-CY1JF221J J 220 1/16W Metal Oxide AA R7027 VRS-CY1JF561J J 560 1/16W Metal Oxide AA...
  • Page 60 LC-20VM2E LC-121M2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA016FE01 Q412 VSUMG4/////-1 J UMG4 MAIN PWB UNIT(Continued) DIODES FB802 RBLN-0035TAZZ J Balun, BLN-0035TA D2005 VHDiMN10///-1 J IMN10 FB803 RBLN-0035TAZZ J Balun, BLN-0035TA D3301 VHDMA3120WA-1 J MA3120WA...
  • Page 61 LC-121M2E LC-20VM2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA017DE01 R341 VRS-CY1JF223J J 22k 1/16W Metal Oxide AA TERMINAL PWB UNIT(Continued) R345 VRS-CY1JF223J J 22k 1/16W Metal Oxide AA R346 VRS-CY1JF823J J 82k 1/16W Metal Oxide AA...
  • Page 62 LC-20VM2E LC-121M2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA017DE01 C7763 VCEAPW1CN477M J 470 16V Electrolytic TERMINAL PWB UNIT(Continued) C7764 RC-FZ0175CEZZ J 0.15 C7765 RC-FZ0175CEZZ J 0.15 R3319 VRS-TQ2BD750J J 75 1/8W Metal Oxide AA...
  • Page 63 RMC4002 RRMCU0225CEZZ J Remote Receiver å QACCK0002TAZZ J AC Cable(LC-20VM2E) J Switch, Select " SW4002 QSW-K0087GEZZ å QACCB0102CEZZ J AC Cable(LC-20VM2E(K)) AV J Switch, Select ' SW4003 QSW-K0087GEZZ QCNW-1335TAZZ J AV Cable SW4004 QSW-K0087GEZZ J Switch, Menu QCNW-5288CEZZ J RS232C Cable...
  • Page 64 1-10 MSPRC0203CEFW J Power Button Spring TLABN0213CEZZ J No. Card (LC-20VM2E) 1-11 GDORF2048CEKA J Front Door TLABN0214CEZZ J No. Card (LC-20VM2E(K)) AA 1-12 GCOVA1798CESA J Front Cover (L) LANGQ9206CEFW J ITO Grounding Angle 1-13 GCOVA1844CESA J Front Cover (R) PSPAZ0311CEZZ...
  • Page 65 LC-121M2E LC-20VM2E LC-150M2E CABINET EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code 2-20 2-21 2-18 2-10 2-27 2-27 2-19 2-26 2-18 2-22 2-14 2-19 2-12 2-24 2-25 2-24 2-19 2-17 2-23 2-25 Inverter PWB...

  • Page 66: Packing Of The Set

    LC-20VM2E LC-121M2E LC-150M2E 14. PACKING OF THE SET Ref. No. Part No. Description Code Ref. No. Part No. Description Code TCAUZ1034CEZZ SPAKF0395CEZZ (A method manual to have) (Packing ADD.)(Top) SPAKF0396CEZZ (Packing ADD.)(Bottom) SPAKP0797CEZZ (Wrapping Paper) TiNS-6860CEZZ (Operation Manual) Battery å...
  • Page 67 LC-121M2E LC-20VM2E LC-150M2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 68 Code Ref. No. Part No. Description Code COPYRIGHT C 1999 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.

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