LG L1718S-BN - - 17" LCD Monitor Service Manual
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LG L1718S-BN - - 17" LCD Monitor Service Manual

Service manual
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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. :
MODEL:
(L1718S-SNQ/L1718S-BNQ.Axx*EP)
xx* means sales region and Module (xxK : INNOLUX, xxB : CPT)
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
L1718S
*To apply the MSTAR Chip.

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Summary of Contents for LG L1718S-BN - - 17" LCD Monitor

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : MODEL: L1718S (L1718S-SNQ/L1718S-BNQ.Axx*EP) xx* means sales region and Module (xxK : INNOLUX, xxB : CPT) 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 ............14 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......15 TIMING CHART ............7 WIRING DIAGRAM ..........22 DISASSEMBLY ............8 EXPLODED VIEW ........... 23 BLOCK DIAGRAM...........10 REPLACEMENT PARTS LIST ....... 24 DISCRIPTION OF BLOCK DIAGRAM ....11 ADJUSTMENT ............

  • 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 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. 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) 70.08 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: Disassembly

    DISASSEMBLY...

  • Page 10: Block Diagram

    BLOCK DIAGRAM InnoLux TFT-LCD Module with 4FFCLs LVDS Transmitter 128KB Flash ROM Inverter + TSUM16AL-LF DC12V to DC5V EEPROM 24C04 3.3V and OSD parameter 1.8V regulator AC Socket Timing 24C02 parameter D-sub AC Input Analog Key pad RGB Signal...

  • Page 11: 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 12: Lips Board Block Diagram

    LIPS Board Block Diagram 50~60Hz HVDC HVDC 66KHz 66KHz INPUT REXTIFIER INPUT REXTIFIER ENERGY ENERGY OUTPUT RECTIFIER OUTPUT RECTIFIER COMPONENTS COMPONENTS AND FILTER AND FILTER TRANSFER TRANSFER AND FILTER AND FILTER LINE LINE 100~240V 100~240V PHOTO-COUPLER PHOTO-COUPLER SIGNAL SIGNAL COMTROL COMTROL ISOLATION ISOLATION...

  • Page 13: Adjustment

    ADJUSTMENT Windows EDID V1.0 User Manual 2. EDID Read & Write 1) Run WinEDID.exe Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Don’t need setup Windows 2000, XP => Need to Port Setup. This program is available to LCD Monitor only. 1.

  • Page 14: Service Osd

    SERVICE OSD 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) Auto Color : W/B balance and Automatically sets the gain and offset value.

  • Page 15: 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 16 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 Is Ok R526? voltage on pin10 of IC501? Check I/F board R526 open Connecting the Are connected rightly CN501,...
  • Page 17 3. DC output voltage is unstable Output Voltage Unstable Check Check ZD801, Check circuit if ZD802, ZD803, Q801 below 0.3V short D803, D805 Check Q801, Q802 Check Pin R of Check R809, Check reference R814, IC801, IC803 voltage voltage R818 about 2.5V Check R810, R811 Check...
  • Page 18 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 19 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 Of U105...
  • Page 20 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 21: 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 22: Wiring Diagram

    WIRING DIAGRAM...

  • Page 24: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Ref.No. LGE Part No. INL Part No. Description MCK30281901 501010205300R BEZEL,FRONT, LE1730 MCK30284501 501010205310R BEZEL,FRONT(Silver), LE1730 EBU30459201 631102071430R LCD PANEL 17" MT170EN01-V7(INL) EBU30458301 790621300600R PCBA,IF BOARD, LE1730-6E0 AGU30210301 701000001300R ASSY,CHASSIS(INL), LE1730 ACQ30210201 714050005200R BACK COVER,ASSEMBLY,LE1730 MFB30282101 501120103100R LENS, LE1730 EBU30459001 790621400600R PCBA,PWR&INV./B, LE1730-6E0 AGU30210601 502060002000R HINGE,ASSEMBLY,LE1730 MCK30283101 501260202000R STAND,NECK, LE1730...
  • Page 25 IF BOARD ITEM P/N Description Usage Location 790621300600R PCBA,IF BOARD, LE1730-6E0 790621320600R PCBA,IF BOARD,OTHRS,LE1730-6E0 790621340600R PCBA,IF BOARD,SMD, LE1730-6E0 629030006500R PROGRAM, LE1730-6E0 511130002202R SOLDER PASTE,Sn95.5%Ag3.9%Cu0.6% 511130002201R SOLDER PASTE,Sn96.5%Ag3.0%Cu0.5% 511130002200R SOLDER PASTE,Sn96.5-Ag3.0-Cu0.5 ROHS 0.43714 511130001200R SOLDER BAR,Sn96.5/Ag3.0/Cu0.5/Ni0.06/Ge0 0.96571 511130000300R SOLDER WIRE,Sn96.5/Ag3.0/Cu0.5/Ni0.06/Ge 0.0667 511140000701R FLUX Grade 0.812 0.010 3.45 ITEM P/N...
  • Page 26 411150356950R ZENER 5.6V MTZS05-5.6-G,SOD-12 3(MMC)RoH 411100656951R ZENER 5.6V ZMM5232B-LF DO213AA (FRONTIER ZD101,ZD105,ZD106,ZD1 07,ZD108, 412000479990R IC CAT24C04WI-TE13 SOIC-8(CATALYST)RoHS 412000279280R IC M24C04-WMN6TP4K SOP8 (ST) RoHS 412000279480R IC AT24C04N-10SU-2.7 SOP8 4K(A TMEL)RoHS U108, 412000330020R IC LD1117AL-1.8V-A SOT223(UTC) RoHS 412000330830R IC AS1117L-1.8/TR-LF,SOT223(A1 SEMI)RoHS U102, 412000372020R IC LD1117AL-3.3V-A SOT-223(UTC RoHS 412000372830R IC AS1117L-3.3TR-LF,SOT223(A1S EMI)RoHS U101,...
  • Page 27 444099030030R CON, SMD 1.0mm 30PIN RoHS AL2309-A0G1Z CN104, 506140005700R LABEL,BARCODE,BLANK,33x7mm, ROHS,FOR PCB 490621300100R PCB,INTERFACE, LE1730-XE0 414916022150R RES SMD (0603) 220 R107, J,RT RoHS REV:A 414916560910R RES SMD (0603) 56 R113,R116,R119, F,RT RoHS REV:A 432002360140R BEAD CORE SMD(0603)60 FB107,FB108,FB109, 600mA, GBK160808 PI BOARD ITEM P/N Description...
  • Page 28 509112306100R SCREW,P,CROSS,T.T-3*6,Zn ITEM P/N Description Usage Location 735100007400R ASSY,H/S,UFF80-005CT/UFF80-015CT,LE1730 411090024040R SCHTKY SRF1040CM 40V/10A ITO22 OAB(MOSPE 411090025040R SCHTKY SRF1045CM 45V/10A ITO22 OAB(MOSPE 411090015020R SCHTKY SRF5-04CT-LF ITO-220AB (FEC) RoHS D805, 411030058040R DIO URF1020 200V/10A ITO220(MO SPEC)RoHS 411020065020R DIO UFF80-015CT-LF 150V/8A, ITO-220AC(FR D803, 507200003800R HEATSINK,56x20xt10mm LE1904/05 509112306100R...
  • Page 29 419342253670R C SMD(0805) Y5V 2.2uF/25V Z RoHS C507,C511, 419311040060R C SMD(0603) X7R 0.1uF/50V K RoHS C821, 419316830060R C SMD (0603) X7R 0.068uF 50V,K RoHS C510, 419316810070R C SMD(0805) X7R 680PF/50V K,RoHS C523,C530, 419304710560R C SMD(0603) NPO 470PF/50V,J,RoHS C529, 419311020060R C SMD(0603) X7R 1000PF/50V K RoHS C504, 419314720060R C SMD(0603) X7R 4700PF/50V K RoHS...
  • Page 30 415030105540R R820,R821, RES CF 1/2W 1M J,AT MINI RoHS 414030330540R R506,R508,R532,R533, RES FSM 1/2W 33 J,AT MINI,RoHS 414870305540R R501,R503, RES MG HV 1/2Ws 3M 3KV J,AT RoHS 430405000000R JMPR ROLL/KG D=0.6mm,AT,RoHS 7.5MM J502,J507,J510,J516,J804 ,J805,J809, 430405000000R JMPR ROLL/KG D=0.6mm,AT,RoHS 10MM J503,J505,J514,J801,J803 ,J808, 430405000000R JMPR ROLL/KG D=0.6mm,AT,RoHS 12.5MM...

  • Page 31: Led Board

    LED BOARD ITEM P/N Description Usage Location 790620500000R PCBA,LED BOARD, LE1730 411070064450R LED O/G 3x5mm 4209UYOSYGW/S530-A3/S195/ 411070061450R LED101, LED O/G 3x5mm L-115WSEKCGKW-8.25LSF5.5/ 430631030030R WFR 2.0mm 3P 180° ,RoHS CN103, 490620500000R PCB,LED BOARD, LE1730 511130001200R SOLDER BAR,Sn96.5/Ag3.0/Cu0.5/Ni0.06/Ge0 0.18354 511130000300R SOLDER WIRE,Sn96.5/Ag3.0/Cu0.5/Ni0.06/Ge 0.01101 511140000701R FLUX Grade 0.812±0.010...

  • Page 32: Schematic Diagram

    SCHEMATIC DIAGRAM 1. DC to DC U101 VCC5V VCC3.3 VCC3.3 LD1117AL-3.3V VCC5V VCC3.3 VIN VOUT Brightness ON/OFF ON/OFF R110 4500-06 CN101 Q106 CCFL_ENABLE PMBT3904 U102 VCC1.8 LD1117AL-1.8V VCC1.8 VIN VOUT VCC5V R190 VCC3.3 R188 Brightness 4K7/NC Dimmer VCC5V VLCD C165/NC Q104 Q101 AP2305GN...
  • Page 33 3. Scaler_TSUM16AL VCC3.3 VCC3.3 VADC RP102 VADC VMPLL VPLL VDDP VDDC FB102 BEAD60OHM R157 GPIO_P07 Key _AUTO R158 GNDB BIN0N GPIO_P06 Key _DOWN R159 Key _POWER BIN0P GPIO_P02/SAR3 R160 GNDG Key _UP GIN0N GPIO_P01/SAR2 R161 GIN0P GPIO_P00/SAR1 Key _MENU VCC1.8 VDDC SOGIN0 RSTN...
  • Page 34 6. Inverter +12V R501 3M/3kv CN504 R531 R507 C522 R506 150uF/35V R508 OLP1 Q501 ZD501 C502 R502 2.2n/50V C501 T501 3.3K 2.2n/50V EEL-19 24:24:2400 C524 U501 10P/3KV OVP1 R517 3.3K R511 C503 IC501 D503 CN502 BAV70/SOT AP9971GD DRV1 PGND R510 VCC5V VDDA DRV2...
  • Page 35 Mar. 2006 P/NO : L1718S Printed in Korea...

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