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LG Flatron W1934S Service Manual
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LG Flatron W1934S Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. :
MODEL:
(W1934S-SNI/W1934S-BNI.Axx*QP)
xx * means sales region and module type
(AxxIQP: INL 5ms, AxxQQP: CMO 5ms, AxxYQP: IVO 5ms)
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
1
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
W1934S
*To apply the MSTAR Chip.

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Summary of Contents for LG Flatron W1934S

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : MODEL: W1934S (W1934S-SNI/W1934S-BNI.Axx*QP) xx * means sales region and module type (AxxIQP: INL 5ms, AxxQQP: CMO 5ms, AxxYQP: IVO 5ms) CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............16 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......17 TIMING CHART ............7 WIRING DIAGRAM ..........24 DISASSEMBLY............9 EXPLODED VIEW ........... 25 BLOCK DIAGRAM...........11 REPLACEMENT PARTS LIST ....... 27 DISCRIPTION OF BLOCK DIAGRAM ....12 ADJUSTMENT ............

  • Page 3: Precautions

    PRECAUTION WARNING WARNING FOR THE SAFETY-RELATED COMPONENT. BE CAREFUL ELECTRIC SHOCK ! • There are some special components used in LCD • If you want to replace with the new backlight (CCFL) monitor that are important for safety. These parts are or inverter circuit, must disconnect the AC marked on the schematic diagram and...

  • Page 4: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this 9. Use with this receiver only the test fixtures specified in service manual and its supplements and addenda, read this service manual. and follow the SAFETY PRECAUTIONS on page 3 of this CAUTION: Do not connect the test fixture ground strap publication.
  • Page 5 General Soldering Guidelines Replacement 1. Carefully insert the replacement IC in the circuit board. 1. Use a grounded-tip, low-wattage soldering iron and 2. Carefully bend each IC lead against the circuit foil pad appropriate tip size and shape that will maintain tip and solder it.
  • Page 6 Circuit Board Foil Repair At Other Connections Excessive heat applied to the copper foil of any printed Use the following technique to repair the defective copper circuit board will weaken the adhesive that bonds the foil to pattern at connections other than IC Pins. This technique the circuit board causing the foil to separate from or involves the installation of a jumper wire on the component side of the circuit board.

  • Page 7: Timing Chart

    TIMING CHART VIDEO SYNC Front Back distingis Polo Resolutio Frequency Total period Display Sync. CLOCK Porch Porch [kHz]/ [Hz] hment rity [MHz] 25.175 31.469 H(Pixels) 640 x 350 V(Lines) 70.8 H(Pixels) 28.321 31.468 720 X 400 V(Lines) 70.09 H(Pixels) 25.175 31.469 640 x 480 V(Lines)
  • Page 8 V(Lines) 59.90 H(Pixels) 55.935 1904 1440 106.500 1440x 900 V(Lines) 59.887 H(Pixels) 70.635 1936 1440 136.750 1440x 900 V(Lines) 74.984...

  • Page 9: Disassembly

    DISASSEMBLY...

  • Page 11: Block Diagram

    BLOCK DIAGRAM...

  • Page 12: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Video Controller Part. This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the digital video signal using a pixel clock. The pixel clock for each mode is generated by the PLL. The range of the pixel clock is from 25MHz to 135MHz.

  • Page 13: Lips Board Block Diagram

    LIPS Board Block Diagram 50-60HZ Operation description_LIPS 1. EMI components. This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse. 2.

  • Page 14: Adjustment

    ADJUSTMENT 1. Software a. port95nt.exe b. Edid.exe c. Writing data: Mars W1934 2. Hardware a. PC（winXP, win2000 or win98）1 pc； b. Writing tools（Including EDID writing card、connecting cable etc.） 3. EDID Writing Connection Figure 1 Figure 2 Figure 3 4. EDID Writing SOP: a.
  • Page 15 b. Select “Model” of main menu. Password: 1234 c. Select written model W1934S d. Input product serial number (The SN is 12 numbers) in “S/N”Column, then the program auto writing start.

  • Page 16: Service Osd

    SERVICE OSD 1) Press MENU Key and Power Key, Monitor Will Enter Service OSD. 2) The SVC OSD menu contains additional menus that the User OSD menu as described below. a) Auto Color : W/B balance and Automatically sets the gain and offset value. b) NVRAM INIT : EEPROM initialize.(24C04) c) CLEAR ETI : To initialize using time.

  • Page 17: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. No Power & Power LED Off No power Check IC802, Check circuit Check primary C805, T801 if short rectifier voltage Check F801, P801, D801 Check pin3 of Check R801, R805, IC802 voltage R822, R823, R817 about 1V Check R803, R807, Check pin2 of IC802 R824, R825...
  • Page 18 2. Backlight can’t be turned on No raster? LED Green? Backlight can’t be turned on. Is there 5Vdc voltage on Check power supply pin2 of IC501? Is there high-level voltage on pin10 of IC501? Is Ok R526? Check I/F board R526 open Connecting the Are connected rightly CN501,...
  • Page 19 3. DC output voltage is unstable Output Voltage Unstable Check Check ZD801, Check circuit if Q801 below 0.3V ZD802, ZD803, short D803 D805 Check Q801, Q802 Check Pin R of Check R809, Check reference IC803 voltage R814, IC801, voltage R818 about 2.5V Check R810, R811 Check...
  • Page 20 4. Output power is unstable Unstable power Check R810, Check sampling R811, R818 Circuit Change R810, R811, Check the C Check the R pin pin voltage voltage of IC803 Change of IC803 if IC803 about 2.5V Check R809, R808, R814, D809 Check pin1 of Check D806, C815 if IC802 voltage...
  • Page 21 5. Black Screen and backlight turn on Black Screen Check power supply: Power Fail Pin1, 2 of CN101 Check FB103 Check pin34, 51, 66, and 82 And U102 Of U105 Check FB106 Check pin32, 49, 56, and 75 And U101 Of U105 Check Reset (pin84) Check C144, R172...
  • Page 22 6. White Screen White Screen LVDS Cable Workmanship Reinsert Change LVDS LVDS Cable NG Cable Check VLCD Check LVDS Panel Fail Is 5V? Signals Check Panel - Enable Check the HW Reset Check C144 Of U105 (pin48) is High? Of U105 pin84 R172 Check R168, R105 Q103, Q101...

  • Page 23: Bad Screen

    7. BAD SCREEN Bad Screen LVDS Cable Reinsert Workmanship Change LVDS Cable LVDS Cable NG Check Crystal:Pin96,97 Check :X101, Of U105 C153,C154 Check the communication Check: SDO,SCZ, Of U105 and U106 SCK,SDI, Reset Check the pins of U105 and U106...

  • Page 24: Wiring Diagram

    WIRING DIAGRAM...

  • Page 25: Exploded View

    Exploded View and Parts List...
  • Page 26 6410TBW004A 453070800720R --UK/Malaysia/Singapore PWRCORD 16A/250V BLK 6FT VDE,H05VV-F 3Cx 6410TEW003A 453070800730R ---Europe/Thailand/Vietnam/Russia/U.A.E PWRCORD 10A/250V BLK 1850mm SAA,H05W-F 3 6410TSW003A 453070800740R ---Australia PWRCORD 7A/125V BLK 1850mm CNS,VCTF 3Gx0 6410TTW001A 453070800750R ---Taiwan MFZ47237101 506060008100R CUSHION,EPS-L,LE19B5 MFZ47237102 506060008110R CUSHION,EPS-R,LE19B5 MAY42295502 506020019900R CARTON LG W1934S(LE19B5)

  • Page 27: Replacement Parts List

    ---Europe/Thailand/Vietnam/Russia/U.A.E PWRCORD 10A/250V BLK 1850mm SAA,H05W-F 3 6410TSW003A 453070800740R ---Australia PWRCORD 7A/125V BLK 1850mm CNS,VCTF 3Gx0 6410TTW001A 453070800750R ---Taiwan MAY42295502 506020019900R CARTON LG W1934S(LE19B5) MFZ47237101 506060008100R CUSHION,EPS-L,LE19B5 MFZ47237102 506060008110R CUSHION,EPS-R,LE19B5 For CMO Item LGE PN INL PN Descriptions Usage COV30007401 631102091440R LCP 19"...
  • Page 28 ---Europe/Thailand/Vietnam/Russia/U.A.E PWRCORD 10A/250V BLK 1850mm SAA,H05W-F 3 6410TSW003A 453070800740R ---Australia PWRCORD 7A/125V BLK 1850mm CNS,VCTF 3Gx0 6410TTW001A 453070800750R ---Taiwan MAY42295502 506020019900R CARTON LG W1934S(LE19B5) MFZ47237101 506060008100R CUSHION,EPS-L,LE19B5 MFZ47237102 506060008110R CUSHION,EPS-R,LE19B5 For IVO Item LGE PN INL PN Descriptions Usage COV30007601 631102091370R LCP 19"...
  • Page 29 IF BOARD 1. FOR INL ITEM Location Description Usage Un 791271300600R PCBA,I/F BOARD,V5,W/O SPK,LE19B5-6E0 ROH 629030014000R PROGRAM,V5,W/O SPK,LE19B5-6E0 ROHS 791271320600R PCBA,I/F BOARD,MI,LE19B5-6E0 ROHS 791271340600R PCBA,I/F BOARD,SMT,LE19B5-6E0 ROHS 511130001201R SOLDER BAR,Sn96.5/Ag3.0/Cu0.5(SAC305 VAC 420431000260R CAP EC 10uF 25V M,105℃ ST 5x11 RoHS C111,C144, C101,C102, 420431010461R CAP EC 100uF 16V M,105℃...
  • Page 30 R106,R172,R180, R181,R191,R184, 414916010350R RES SMD (0603) 10KΩ J,RT RoHS R185,R175, R102, 414916010450R RES SMD (0603) 100KΩ J,RT REV:A RoHS R105, 414916020350R RES SMD (0603) 20KΩ J,RT RoHS REV:A R136,R137, 414916022250R RES SMD (0603) 2.2KΩ J,RT RoHS R121, 414916047150R RES SMD (0603) 470Ω J,RT RoHS REV:A R108,R109,R110, R122,R149,R150, R154,R155,R166,...
  • Page 31 2. FOR CMO ITEM Location Description Usage 791271300500R PCBA,I/F BOARD,L07,W/O SPK,LE19B5-5E0 RO 629030014020R PROGRAM,L07,W/O SPK,LE19B5-5E0 ROHS 791271320600R PCBA,I/F BOARD,MI,LE19B5-6E0 ROHS 791271340600R PCBA,I/F BOARD,SMT,LE19B5-6E0 ROHS 511130001201R SOLDER BAR,Sn96.5/Ag3.0/Cu0.5(SAC305 VAC 420431000260R CAP EC 10uF 25V M,105℃ ST 5x11 RoHS C111,C144, 420431010461R CAP EC 100uF 16V M,105℃ ST 5x11(SK) RoH C101,C102, C105,C130, 420432200460R CAP EC 22uF 16V M,105℃...
  • Page 32 340 R121, 414916047150R RES SMD (0603) 470Ω J,RT RoHS REV:A R108,R109,R110, R122,R149,R150, R154,R155,R166, 414916047250R RES SMD (0603) 4.7KΩ J,RT RoHS R173,R174,R182, R183,R176, 360 R169, 414916390010R RES SMD (0603) 390Ω F,RT RoHS 370 R133,R134,R135, 414916750910R RES SMD (0603) 75Ω F,RT RoHS REV:A 380 RP102, 415751035080R RP(0612)10KΩx4 1/16W J 8P4R RoHS C158,C159,C160,...
  • Page 33 420431010461R CAP EC 100uF 16V M,105℃ ST 5x11(SK) RoH C101,C102, C105,C130,C133, 420432200460R CAP EC 22uF 16V M,105℃ ST, 5x11,RoHS C142,C145, 420432210460R CAP EC 220uF 16V M,105℃ ST 6.3x11 RoHS C108, CN101, 430631060020R WAFER 2.0mm 6P 180°,RoHS CN105, 430631080130R WAFER 2x4P 2.0mm,200PHD-2*4ST RoHS X101, 432008010370R XTAL 14.31818MHz 16pF HC-49US 30PPM,DIP, CN103,...
  • Page 34 C158,C159,C160, C161,C162,C163, 419311020060R C SMD(0603) X7R 1000PF/50V K RoHS C164,C138,C155, C153,C154, 419302200560R C SMD(0603) NPO 22PF/50V J RoHS C126, 419302210560R C SMD(0603) NPO 220PF/50V J RoHS C125, 419303300560R C SMD(0603) NPO 33PF/50V J RoHS C103,C104,C106, C107,C109,C129, C131,C132,C134, C135,C136,C137, 419311040060R C SMD(0603) X7R 0.1uF/50V K RoHS C139,C141,C143, C147,C148,C149, C150,C151,C152,...
  • Page 35 150 C803, 418247233020R CAP CD X7R 4700pF 1KV K,W/O FO RMING,RoH CN501,CN502, 430637020030R WFR. 2P P=3.5mm 90°W/LOCK,RoHS CN503,CN504, 170 T501,T502, 426000090680R XFMR SW,121.5uH EEL19M DIP SPW-068,RoHS 180 C506,C523, 418110058560R CAP CD SL 10pF 3KV J,ST,RoHS CC45SL3FD10 190 C528,C509, 418105058960R CAP CD SL 5pF 3KV D,ST, RoHS CC45SL3FD05 200 H802, 735100007120R ASSY,H/S,SBR10U100CT/U40CT, LE1710 210 H801,...
  • Page 36 620 C524,C532, 419316830060R C SMD (0603) X7R 0.068uF 50V,K RoHS D501,D505, 411023004021R DIO SN4148-LF 75V/0.15A SMD 1206 (FEC)Ro D506,D510, D502,D503,D504, 411020026210R DIO BAV99 350mW 70V SOT-23(PHI RoHS D507,D508,D509, 650 F802, 430613740400R FUSE SLW 4A/32V SMD U/C/ 0603 ROHS 660 R502, 414916033050R RES SMD (0603) 33Ω...
  • Page 37 1030 C802,C811, 418210227030R CAP CD X7R 1000pF 500V K VT RoHS 1040 C817,C822, 419111040030R CAP MTL X7R 0.1uF 50V K,VT, RoHS C814,C815, 420264700230R CAP SH 47uF 25V M,125℃,VT, 6.3x11,RoHS 1050 C818,C819, 1060 Q802, 410072013210R XSTR 2PC1815GR*I VT (PHILIPS) RoHS REV: 1070 IC803, 412022002840R IC TL431ACLPG TO-92 1%,VT(ON)RoHS 1080 C816,...
  • Page 38 D803, 411090009480R SCHTKY SP10100C 100V/10A ITO220(WILLAS)R D805, 411090011090R SCHTKY SB1060FCT 60V/10A ITO 220AB(PANJI 507200003800R HEATSINK,56x20xt10mm LE1904/05 509112308101R SCREW,PAN,TT"B",M3x1.049x8,PHP LP1702 Q801, 410500045211R XSTR PMBS3904 NPN 100MA,60V SOT23(PHILIP ZD803, 411131456920R ZENER 5.6V MMSZ5232A SOD-123(WILLAS)ROHS ZD801, 411131491920R ZENER 9.1V MMSZ5239A SOD-123(WILLAS)ROHS ZD804,ZD805, 411100916020R ZENER 16V MMSZ5246A SOD123(PEC RoHS R809, 414904100010R RES SMD (1206) 100Ω...
  • Page 39 R533, 414916200110R RES SMD (0603) 2KΩ F,RT,RoHS IC501, 412000455630R IC OZ9938GN SOIC16(O2 MICRO)RoHS U501,U502, 410500070290R XSTR AP9971GM,N-CH,SO8(APEC) RoHS R504,R505, 414908033050R RES SMD (0805) 33Ω J,RT RoHS R530,R532, 791271410600R PCBA,P/I BOARD,AI,W/O SPK,LE19B5-6E0 ROH C507,C515, 419342254670R C SMD(0805) Y5V 2.2uF/16V Z RoHS C519,C520, 419313330060R C SMD(0603) X7R 0.033uF/50V K ROHS 511110001101R SEAL-GLUE,3629,(LOCTITE)
  • Page 40 3. FOR IVO ITEM Location Description Usage Un 791271400600R PCBA,P/I BOARD,W/O SPK,LE19B5-6E0 ROHS IC801, 412140002380R IC LTV817M-PR VDE (LITE-ON) P=10mm RoHS D801, 411050005090R DIO BRDG FL406 600V/4A(PEC)RoH S C804, 416194743011R CAP MEX 0.47uF 275V K X2,F15 RoHS C820,C801,C806, 416202224610R CAP MEY 2200pF 400V M Y,F10mm RoHS 420421020211R CAP SD 1000uF 25V M,105℃...
  • Page 41 R816, 414908068950R RES SMD (0805) 6.8Ω J RT RoHS R811, 414908510210R RES SMD (0805) 51KΩ F,RT RoHS R508, 414916430210R RES SMD (0603) 43KΩ F,RT,RoHS R817, 414908120210R RES SMD (0805) 12K F RT RoHS REV:A R802,R806, 414904010050R RES SMD (1206) 10Ω J,RT RoHS R829, 414908020150R RES SMD (0805) 200Ω...
  • Page 42 ZD802, 411022020090R DIO P6KE200A 600W/100A,DO-15(P ANJIT)RoH LABEL,BARCODE,BLANK,33x7mm, ROHS,FOR 506140005700R R820,R821, 415030105540R RES CF 1/2W 1MΩ J,AT MINI RoHS J504,J513,J516, 430405000000R JMPR ROLL/KG D=0.6mm,AT,RoHS 7.5MM 106 MM J803,J514,J517, J501,J510,J801, 430405000000R JMPR ROLL/KG D=0.6mm,AT,RoHS 10MM 121 MM J805,J806,J807, J505,J506,J511, 430405000000R JMPR ROLL/KG D=0.6mm,AT,RoHS 12.5MM 113.3 MM J804,J808, J503,J502,J512,...

  • Page 43: Schematic Diagram

    SCHEMATIC DIAGRAM 1. DC to DC...
  • Page 44 2. Input...
  • Page 45 3. Scaler_TSUM16AL...
  • Page 46 4. Keypad...
  • Page 47 5. Inverter...
  • Page 48 6. Power...
  • Page 49 . 2007 P/NO: Printed in Korea...

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