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LG Flatron L1934S Service Manual

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

COLOR MONITOR

SERVICE MANUAL

MODEL:
L1934S
(W1934S-BNT/SNT.AxxQQPH. For CMO MODULE,
                   
AxxVQPH. For AUO MODULE xx:sales marketing, Mstar
scaler)
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
*To apply the MSTAR Chip.

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Summary of Contents for LG Flatron L1934S

  • Page 1: Color Monitor

    E-mail: http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL MODEL: L1934S (W1934S-BNT/SNT.AxxQQPH. For CMO MODULE,                     AxxVQPH. For AUO MODULE xx:sales marketing, Mstar scaler) 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 ..........23 DISASSEMBLY ............8 EXPLODED VIEW...........24 BLOCK DIAGRAM...........11 REPLACEMENT PARTS LIST .......26 DISCRIPTION OF BLOCK DIAGRAM ....13 ADJUSTMENT ............15 SCHEMATIC DIAGRAM ......... 34 SPECIFICATIONS 1.

  • Page 3: Precautions

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

  • 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. Use a grounded-tip, low-wattage soldering iron and 1. Carefully insert the replacement IC in the circuit board. appropriate tip size and shape that will maintain tip 2. Carefully bend each IC lead against the circuit foil pad 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 pattern at connections other than IC Pins. This technique to the circuit board causing the foil to separate from or involves the installation of a jumper wire on the "lift-off"...

  • Page 7: Timing Chart

    TIMING CHART Video Total Sync Front Back Sync Active MODE H / V Frequency Period Duration Porch Porch Resolution Polarity Clock Time ( E ) ( C ) ( D) ( B ) ( A ) H(Pixels) 31.469 25.175 640 X 350 V(Lines) 70.08 H(Pixels)

  • Page 8: Disassembly

    DISASSEMBLY-Set Put the monitor on a soft flat. Pull out the hinge cover as arrow direction. Remove the four screws. Put the front cover upward. Then let the all latches are separated. Put the front face down, disassembly back cover. Pull the key board out of bezel.
  • Page 9 ＃8 Disassembly the bezel. Disassembly the connector and screw. Remove the 2 screws. Disassemble the LVDS cable Main board and power board The panel...
  • Page 10 DISASSEMBLY-Stand Pull the Base 2 ea Latches to inside until losing elasticity. Consequently, pull the stand body directly. Separate Stand Body & Stand Base. Fix Stand Base & Stand Body. Remove the three screws. Separate the hinge and stand.

  • Page 11: Block Diagram

    BLOCK DIAGRAM...
  • Page 12 BLOCK DIAGRAM-POWER Power 100~240V EMI filter Rush Rectification Diode Transformer 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 4 CCFL lamps OVP circuit VDDA ON/OFF...

  • 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 25MHz to 135MHz.

  • 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

    ④ input serial NO. ② choose panel type For LG , the number of SN is 12. So input 12 digits，then EDID data will be send to the monitor from PC. ③ if you get the right panel type, the you can go to the...

  • Page 16: Service Osd

    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 17: 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 90-264v is normal Measure C423 (+) Check CN404 or replace =1.8V Q409, Q410, and U404 U404 PIN2=3.3V Check X401 oscillate Replace X401 waveforms are normal Replace U401...
  • Page 18 2. NO RASTER (OSD IS NOT DISPLAY)-LIPS No Raster (OSD Is Not Displayed) Check power board and find out a Check U404 short point as penning each power PIN 3 =5V? line Check U404 Check U404 Check C426,C427 PIN 2 =3.3V? 1.
  • Page 19 2. NO RASTER (OSD IS NOT DISPLAY)-MSTAR No Raster (OSD Is Not Displayed) SCALER PIN1，2 1. Check C411 C412 OSCILLATES AS 2. Check X401 14.318MHZ? 3. TROUBLE IN SCALER IC CHECK CONNECTION SCALER IC LINE FROM D-SUB TO PIN16 H SYNC ? SCALER PIN17 V SYNC? TROUBLE IN CABLE OR...
  • Page 20 4. TROUBLE IN DPM TROUBLE IN DPM SCALER IC PIN16 H SYNC? CHECK H/V SYNC LINE PIN17 V SYNC? TROUBLE IN CABLE OR LCD MODULE...
  • Page 21 5. POWER No Power (Power Indicator Off) Check AC line Check AC line volt Check F901, BD901 Check the voltage of C905(+) Check start voltage Check D905, R934, for the pin1 of R928,IC901 IC901 Check IC901 pin 7 Check D902,C907 Vcc is 13v? Check IC901 PIN6 Check D901,Q903,ZD904...
  • Page 22 6. RASTER NO Raster (Lamp Off) Check C811 (+) Check power section =12V Check Interface section or Check ON/OFF main board signal Check Q801 Q802 Q803 CheckIC801 pin ZD801 2=5V? Check IC801 Check IC801 pin 5/pin6 Pin1/pin15 have the output of sawtooth wave at short time Replace IC801 Cut all the pin connector of...

  • Page 23: Wiring Diagram

    WIRING DIAGRAM 89G179E30N586 95G 825 7W503 89G 76J 8526...

  • Page 24: Exploded View

    EXPLODED VIEW...

  • Page 25: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Ref. No. TPV part no. LGE part no. Description A34G0563ABNA1B0100 ABJ55934301 Bezel (Front cabinet) Silver color A34G0563 B6A1B0100 ABJ55934302 Bezel (Front cabinet) Black color KEPC7QG8 EBU51011201 KEY BOARD include control wire 750GLM90A1A12N COV30013601 CMO PANEL M190A1-L0A C1 NB 750GLV90W1021N COV30024802 AUO PANEL TPM190A1-PW01 V0...

  • Page 26: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2008. 01. 27 LOC. NO. PART NO. DESCRIPTION MAIN BOARD CAPACITORS C427 067G 3151014KV EC 105℃ CAP 100UF M 25V C426 067G 3151014KV EC 105℃ CAP 100UF M 25V C423 067G 3151014KV EC 105℃ CAP 100UF M 25V C421 067G 3151014KV EC 105℃...
  • Page 27 C104 065G0402509 31 CHIP 5pF 50V NPO C108 065G0402509 31 CHIP 5pF 50V NPO C111 065G0402509 31 CHIP 5pF 50V NPO DIODEs ZD103 093G 39S 34 T UDZSNP5.6B ROHM ZD104 093G 39S 34 T UDZSNP5.6B ROHM D402 093G3004 3 SM340A U401 056G 562557 IC TSUM1PFR-LF...
  • Page 28 R114 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R115 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R117 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R405 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R441 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R118 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W...
  • Page 29 CN404 033G3802 9 WAFER 9P RIGHT ANELE PITCH CN402 033G8019 8C FPC/FFC CONN CN403 033G801930F CH JS CONNECTOR CN101 088G 35315F H D-SUB 15PIN POWER BOARD CAPACITORS C903 063G107K474 6S CAP X2 0.47UF K 275VAC C840 065G 3J3096ET 3PF,J,3KV,Z5P C839 065G 3J3096ET 3PF,J,3KV,Z5P C826...
  • Page 30 C814 065G0805105 22 CHIP 1UF 25V X7R 0805 C830 065G0805105 22 CHIP 1UF 25V X7R 0805 C806 065G0805105 22 CHIP 1UF 25V X7R 0805 C804 065G0805105 22 CHIP 1UF 25V X7R 0805 C914 065G0805152 32 CHIP 1500PF 50V X7R 0805 C912 065G0805152 32 CHIP 1500PF 50V X7R 0805...
  • Page 31 ZD901 093G 39S 40 T RLZ 13B LLDS ZD906 093G 39S 42 T RLZ27B LLDS BD901 006G 31500 EYELET D905 093G 5212T52T DIODE 1N4007 DO-41 D901 093G 6026W52T FR107 D902 093G 6038T52T FR103 D903 095G 90 23 JUMPER TRANSISTORs & ICs IC902 056G 139 7 1 IC EL817MA M-TYPE...
  • Page 32 R838 061G0805105 1MOHM 1/10W R820 061G0805105 1MOHM 1/10W R813 061G0805105 1MOHM 1/10W R816 061G0805105 1MOHM 1/10W R810 061G0805105 1MOHM 1/10W R913 061G0805124 RST CHIPR 120 KOHM +-5% 1/8W R817 061G0805200 2F RST CHIPR 20 KOHM +-1% 1/8W R908 061G0805202 RST CHIP 2K 1/8W 5% R924 061G0805240 1F RST CHIPR 2.4KOHM +-1% 1/8W...
  • Page 33 R805 061G1206471 470 1206 R835 061G1206472 RST CHIPR 4.7 KOHM +-5% 1/4W R834 061G1206472 RST CHIPR 4.7 KOHM +-5% 1/4W R833 061G1206472 RST CHIPR 4.7 KOHM +-5% 1/4W R828 061G1206472 RST CHIPR 4.7 KOHM +-5% 1/4W R846 061G1206511 RST CHIPR 510 OHM +-5% 1/4W R837 061G1206519 RST CHIPR 5.1 OHM +-5% 1/4W...

  • Page 34: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER TSUM1PFR-LF SCHEMATIC XGA/SXGA LVDS OUTPUT DSUB_R+ DSUB_R+ VCC1.8 DSUB_R- DSUB_R- DSUB_G+ DSUB_G+ VCC3.3 DSUB_G- DSUB_G- VCC1.8 DSUB_SOG DSUB_SOG CMVCC DSUB_B+ DSUB_B+ DSUB_5V DSUB_B- DSUB_B- VCC3.3 CMVCC1 DSUB_H DSUB_H CMVCC1 DSUB_V DSUB_V DSUB_5V DDC1_SDA DDC1_SDA CMVCC VCC3.3 DDC1_SCL DDC1_SCL ESD_VCC...
  • Page 35 H_Sy nc R101 0R05 1/10W 5% R102 100R 1/16W 5% DSUB_H V_Sy nc R103 100R 1/16W 5% FB102 DSUB_V R104 C101 VGA_B+ DSUB_B+ 5 VCC3.3 R105 R106 C102 C103 BEAD 2K2 1/16W 5% 2K2 1/16W 5% 100R 1/16W 5% 0.047uF 22pF 22pF R107...
  • Page 36 AVDD VDDP VDDC VCC3.3 VDDP AVDD FB401 U401 VCC3.3 300OHM VCTRL VCTRL C403 C404 LVA3P 0.1uF/16V 0.1uF/16V DSUB_R+ RIN0P LVA3M DSUB_R- RIN0M PA[0..1] DSUB_G+ GIN0P PA[0..1] DSUB_G- GIN0M LVA2P DSUB_SOG SOGIN0 LVA2M DSUB_B+ BIN0P LVA1P DSUB_B- BIN0M LVA1M VCC1.8 VDDC DSUB_H HSY NC0 LVA0P...
  • Page 37 PANEL_VCC CN403 PA[0..1] PB[0..9] PA[0..1] PB[0..9] R434 C420 PA[4..9] PA[4..9] 330 OHM 1/4W 0.1uF/16V CMVCC AO3401L CMVCC R433 C419 R435 10K 1/16W 5% 0.1uF/16V PANEL_VCC 4K7 1/16W 5% Q405 AO3401 R436 FB402 CONN 100K 1/16W 5% PPWR_ON# Q404 PPWR_ON# PMBS3906 120OHM C421 100uF25V...
  • Page 38 ESD_VCC 4 CMVCC DSUB_5V D403 CMVCC DSUB_5V 4 VCC3.3 VCC3.3 D401 CN404 VCC3.3 BAT54C R437 R439 CMVCC1 D402 SM340A 10K 1/16W 5% 10K 1/16W 5% CMVCC CMVCC1 5 VCC1.8 CMVCC BKLT-EN Q410 BKLT-VBRI R450 R449 KN2907AS BKLT-EN Q406 VCC1.8 C_PANEL_INDEX 2N3904S-RTK/PS PANEL_ID# 5 Volume...
  • Page 39 2. INVERTER PT801 POWER X'FMR JP934 CN801 OPT1 C825 12PF6KV R836 CONN +12V 1KΩ 1/8W BEAD 61G0805102 33G8021 2E AC C828 R805 0.1uF R802 470 1/4W 300KΩ 1/8W R829 R804 C811 10KΩ 1/8W C813 80GL17T 40 DN 470uF25V 1000pF 82OHM +-5% 1/4W R818 CN802 Q803...
  • Page 40 3. POWER BD901 R933 61G1206101 KBJ408G BEAD R932 93G 50460 38 0.0015uF/2KV C905 L906 61G1206101 100uF/450V R906 71G 55 29 65G 2K152 1T GP 100Ω 1/4W 61G1206101 67G315Y 10115H 65G 2K152 1T GP C934 POWER X'FMR C931 0.0015uF/2KV 93G 39S 40 T T901 +12V 80GL22T 2 LS...
  • Page 41 Jan. 2008 P/NO : Printed in China...

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