LG Flatron W1941S Service Manual
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LG Flatron W1941S Service Manual

Color monitor
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E-mail: http://www.LGEservice.com/techsup.html

COLOR MONITOR

SERVICE MANUAL

W1941S
MODEL:
(****************)
**Sales Market
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
*To apply the MSTAR Chip.
- 1 -

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  • Page 1: Color Monitor

    E-mail: http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL W1941S MODEL: (****************) **Sales Market CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip. - 1 -...

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ...........2 SERVICE MODE ............17 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......18 TIMING CHART ............7 WIRING DIAGRAM ........... 24 DISASSEMBLY ............8 EXPLODED VIEW............25 BLOCK DIAGRAM...........11 REPLACEMENT PARTS LIST ......... 27 DISCRIPTION OF BLOCK DIAGRAM ....13 SCHEMATIC DIAGRAM ......... 35 ADJUSTMENT ............

  • Page 3: Precautions

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  • Page 7: Timing Chart

      TIMING CHART - 7 -...

  • Page 8: Disassembly

      DISASSEMBLY-Set Put the monitor on a soft flat. Pull out the stand and the hinge cover. Put the front cover upward. Then let the all Remove the three screws. latches are separated. Put the front face down, disassembly back cover.
  • Page 9   ＃8 Disassembly the bezel. Disassembly the connector and screw. Remove the screw. Disassemble the FFC cable. Main board and power board. The panel. - 9 -...
  • Page 10   DISASSEMBLY-Stand Pull the Base Latches to inside until losing elasticity. Consequently, pull the stand body directly. Separate Stand Body & Stand Base. Fix Stand Base & Stand Body. Separate the hinge and stand. - 10 -...

  • Page 11: Block Diagram

      BLOCK DIAGRAM - 11 -...
  • Page 12   BLOCK DIAGRAM-POWER Power EMI filter Rush Rectification Transformer Diode   100~240V prevention rectifier   Starting resistor Switching Feedback 5V/12V circuit (PWM OVP protect control output OVP control IC & circuit circuit MOSFER) Inverter LC resonance Transformer Push-pull conversion circuit 2 CCFL lamps OVP circuit VDDA...

  • Page 13: 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 79.5MHz to 90MHz.

  • Page 14: Lips Board Block Diagram

      LIPS Board Block Diagram 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 15: Adjustment

      ADJUSTMENT Windows EDID V1.0 User Manual Operating System: DOS, windows98, 2000, XP 1. Parallel port setting Enter your bios, and do as followings. a) Integrated peripheral b) Super IO Device c) Parallel port mode you should set the” parallel port mode” to SPP for using the DOS EDID tool surely. 2.
  • Page 16   Please check Manufacturer Name、 Vendor Assigned Code、 Monitor Name、 Serial Number： *****[???????? ******] (it must be the same as Bar Code)、 Week of Manufacture：**、Year of Manufacture：****、Check sum：** (It must be the same as the last byte of data table, as follows picture shows). Above of all must be right, then if it shows the green “PASS”, it means record succeeds ,the red “Fail”...

  • Page 17: Service Mode

        SERVICE MODE       1) Turn off the power switch at the front side of the display. 2) Wait for about 5 seconds and press MENU, POWER switch with 1 second interval. 3) The SVC OSD menu contains additional menus that the User OSD menu as described below. a) CLEAR ETI: To initialize using time.

  • Page 18: Troubleshooting Guide

      TROUBLESHOOTING GUIDE 1. NO POWER   No Power (Power Indicator Off) Check the Adapter/Inverter Please reinsert and section make sure the AC of 100-240v is normal Measure C704 (+) Check CN701 or replace =1.8V Q702, Q703, and U701 U701 PIN2=3.3V Check X401 oscillate Replace X401 waveforms are normal...
  • Page 19   2. NO RASTER (OSD IS NOT DISPLAY)-LIPS   No Raster (OSD Is Not Displayed) Check power board and find out a Check U701 short point as penning each power PIN 3 =5V? line Check U701 Check U701 Check C706,C707 PIN 2 =3.3V? 1.
  • Page 20   2. NO RASTER (OSD IS NOT DISPLAY)-MSTAR   No Raster (OSD Is Not Displayed) SCALER PIN 96, 1. Check C420 C421 97 OSCILLATES 2. Check X401 AS 14.318MHZ? 3. TROUBLE IN SCALER IC CHECK CONNECTION SCALER IC LINE FROM D-SUB TO PIN 27 H SYNC ? SCALER PIN 28 V SYNC?
  • Page 21   4. TROUBLE IN DPM   TROUBLE IN DPM SCALER IC PIN 27 H SYNC? CHECK H/V SYNC LINE PIN 28 V SYNC? TROUBLE IN CABLE OR LCD MODULE - 21 -...
  • Page 22   5. POWER No Power (Power Indicator Off) Check AC line Check AC line volt Check F901, BD901 Check the voltage of C905(+) Check start Check D905, R934, voltage for the pin1 R929,R928,IC901 of IC901 Check IC901 pin 7 Check D902,C907   Vcc is 13v? Check IC901 PIN6 Check D901,Q903,ZD904  ...
  • Page 23   6. RASTER   NO Raster (Lamp Off) Check C811 (+) Check power section =12V Check Interface section or Check ON/OFF main board   signal CheckIC801 pin Check Q801 Q802 Q803 2=5V?   ZD801 Check IC801 Check IC801 pin 5/pin6 Pin1/pin15 have the output of sawtooth Replace IC801...

  • Page 24: Wiring Diagram

      WIRING DIAGRAM 089G179J30N511 95G 825 7D504 95G820H 6W503 - 24 -...

  • Page 25: Exploded View

      EXPLODED VIEW   - 25 -...

  • Page 26: Exploded View Parts List

      EXPLODED VIEW PARTS LIST Ref. No. TPV part no. LGE part no. Description Q34G0459 B6A1B0130 BEZEL(18.5") Q33G0238 1 1C0100 LENS Q33G0239 B6 1L0100 KEY BUTTON KEPC8QG8 KEY BOARD 750GLG185H1A11N000 PANEL LM190WH1-TLA1 KR LPL PWPC8921CYA1 POWER BOARD 756GQ8CB KL005 MAIN BOARD-CBPCRM5LMQ2 Q15G0360101 MAINFRAME Q34G0460 B6 1B0100...

  • Page 27: Replacement Parts List

      REPLACEMENT PARTS LIST DATE: 2008. 10. 16 LOC. NO. PART NO. DESCRIPTION MAIN BOARD CAPACITOR C102 065G0402473 12 CHIP 0.047UF 16V X7R C103 065G0402220 31 CHIP 22PF 50V NPO C104 065G0402220 31 CHIP 22PF 50V NPO C105 065G0402509 31 CHIP 5PF 50V NPO C106 065G0402473 12...
  • Page 28   C422 065G0402104 15 MLCC 0402 0.1UF K 16V X5R C423 065G0402224 17 CAP CER 0.22UF -20%-80% C432 065G0402104 15 MLCC 0402 0.1UF K 16V X5R C433 065G0402104 15 MLCC 0402 0.1UF K 16V X5R C434 065G0402104 15 MLCC 0402 0.1UF K 16V X5R C435 065G0402104 15 MLCC 0402 0.1UF K 16V X5R...
  • Page 29   R113 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R114 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R115 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R116 061G0402750 RST CHIPR 75 OHM +-5% 1/16W R117 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R124 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W...
  • Page 30   COIL & FILTER FB101 071G 59K190 B 19 OHM BEAD FB102 071G 59K190 B 19 OHM BEAD FB103 071G 59K190 B 19 OHM BEAD FB401 071G 56V301 B CHIP BEAD FCM2012VF-301T07 BULLWILL FB402 071G 56V301 B CHIP BEAD FCM2012VF-301T07 BULLWILL FB404 071G 56V301 B CHIP BEAD FCM2012VF-301T07 BULLWILL...
  • Page 31   C902 065G306M2222BP 2200PF +-20% 250VAC C903 063G107K474 6S CAP X2 0.47UF K 275VAC C903 006G 31502 1.5MM RIVET C904 065G0805104 32 CAP CHIP 0805 0.1UF K 50V X7R C905 067G315Y10115H CAP 105℃ 100UF M 450V C905 006G 31502 1.5MM RIVET C907 067G 5152207HT CAP 105℃...
  • Page 32   D905 093G 52 1552T DIODE 1N4007-E3/54 1A/1000V DO-41 D905 093G 5212T52T DIODE 1N4007 DO-41 D907 093G 60267 SP10100 D908 093G3006 1 1 31DQ06FC3 NIHON INTER ZD001 093G 39GA01 T RLZ5.6B ZD002 093G 39GA01 T RLZ5.6B ZD003 093G 39GA01 T RLZ5.6B ZD004 093G 39GA01 T...
  • Page 33   R803 061G0805103 RST CHIPR 10K OHM +-5% 1/8W R804 061G0805103 RST CHIPR 10K OHM +-5% 1/8W R805 061G1206471 RST CHIPR 470 OHM +-5% 1/4W R806 061G0805103 RST CHIPR 10K OHM +-5% 1/8W R807 061G1206220 RST CHIPR 22 OHM +-5% 1/4W R808 061G0805473 RST CHIPR 47K OHM +-5% 1/8W...
  • Page 34   R920 061G0805302 RST CHIPR 3K OHM +-5% 1/8W R921 061G0805102 RST CHIPR 1K OHM +-5% 1/8W R922 061G0805102 RST CHIPR 1K OHM +-5% 1/8W R923 061G0805330 2F RST CHIPR 33K OHM +-1% 1/8W R924 061G0805240 1F RST CHIPR 2.4K OHM +-1% 1/8W R925 061G0805360 1F RST CHIPR 3.6K OHM +-1% 1/8W...

  • Page 35: Schematic Diagram

      SCHEMATIC DIAGRAM 1. SCALER   FB102 VGA_B+ MVCC_1 R105 100R 1/16W 5% C102 DSUB_B+ BEAD 0.047uF H_Sy nc R102 0R05 1/10W 5% R103 1K 1/16W 5% R108 C105 DSUB_H V_Sy nc R104 1K 1/16W 5% 5pF/50V DSUB_V D109 75R 1/16W 5% VGA_B- R106 R107...
  • Page 36   CN301 CN302 LVB0M RXO0- LVB0P RXO0+ PA[0..9] LVB0M RXO0- RXO0+ LVB0P LVB1M RXO1- PA[0..9] LVB1M RXO1- RXO1+ LVB1P LVB1P RXO1+ PA0 LVA3P LVB2M RXO2- RXO2+ LVB2P LVB2M RXO2- PA1 LVA3M LVBCKM RXOC- RXOC+ LVBCKP LVB2P RXO2+ PA2 LVACKP LVB3M RXO3- RXO3+ LVB3P...
  • Page 37   CMVCC VCC1.8 C710 0.1uF 16V FB702 300 OHM CN701 C705 C704 100UF25V SM340A VCC3.3 D701 MVCC 0.1uF/16V CMVCC Q702 CMVCC KN2907AS BKLT-VBRI R709 BKLT-EN R710 NC R705 PANEL_ID# PANEL_ID# 2 Volume# Q703 10K 1/16W 5% Volume# Mute KN2907AS Mute 2 VCC3.3 R706 BKLT-VBRI...
  • Page 38   VCC1.8 VDDC VDDP FB403 VCC3.3 FB401 AVDD VCC3.3 FB402 VPLL VCC3.3 VCC1.8 0 OHM +-5% 1/8W C412 300OHM 300OHM VCC3.3 C409 C408 C403 C402 C404 C406 10UF50V C410 C411 0.1uF/16V C407 0.1uF/16V 0.1uF/16V C405 0.1uF/16V 0.1uF/16V VDVI VMPLL VPLL AVDD VDDP VDDC...
  • Page 39 L901 0.0022uF/250V 3300pF 250V 100Ω 1/4W 61G1206101 R928 65G306M2222B3 2.0MH R931 D904 100Ω 1/4W 61G1206101 3.3MΩ 1/4W 65G306M2222B3 73L 174 53 LG GP 65G306M3322BP R916 IC901 100Ω 1/4W 61G1206101 61G1206335 LD7522 Q903 56G 379 79 61G1206470 R910 FQPF8N60C Line 57G 667 47...
  • Page 40   3. INVERTER PT801 POWER X'FMR JP934 CN801 OPT1 C825 12PF6KV R836 CONN +12V 1KΩ 1/8W BEAD 61G0805102 33G8021 2E AC C828 R805 R802 470 1/4W 0.1uF 300KΩ 1/8W R829 R804 C811 10KΩ 1/8W C813 80GL17T 40 DN 470uF25V 1000pF 82OHM +-5% 1/4W R818 CN802...
  • Page 41   Oct.2008 P/NO: Printed in China - 41 -...

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