LG FLATRON 568LM LM568E-CA Service Manual
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LG FLATRON 568LM LM568E-CA Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CL-18
FACTORY MODEL: LM568E
MODEL:
*(
) ID LABEL MODEL No.
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MUTE
MENU
AUTO
VOL
SET
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
LCD 568LM
(LM568E-CA)

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Summary of Contents for LG FLATRON 568LM LM568E-CA

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-18 FACTORY MODEL: LM568E MODEL: LCD 568LM (LM568E-CA) ) ID LABEL MODEL No. CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MUTE MENU AUTO...

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............12 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......13 TIMING CHART ............4 PRINTED CIRCUIT BOARD........18 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW...........21 WIRING DIAGRAM ..........6 REPLACEMENT PARTS LIST .......23 DISASSEMBLY ............7 PIN CONFIGURATION..........27 BLOCK DIAGRAM ..........

  • Page 3: Precautions

    If the wires are pressed cause short and may • Do not modify original design without obtaining written burn or take fire. permission from LG or you will void the original parts and labor guarantee. TAKE CARE DURING HANDLING THE LCD MODULE WITH BACKLIGHT UNIT.

  • Page 4: Timing Chart

    TIMING CHART VIDEO SYNC Total Video Blanking Sync Back Front Sync Frequency MODE H / V Resolution Period Active Time Duration Porch Porch Polarity Clock ( E ) Time ( A ) ( B ) ( D ) ( F ) ( C ) 25.175 31.468 KHz...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW DC Power Connector MIC . MIC . OU T AU DIO D-Sub AUTO MUTE MENU Signal Connector Front Control Panel Power (DPMS) Indicator Power ON/OFF Button Front Control Panel AUTO MUTE MENU Power ON/OFF Button Note: Some signal from some graphics boards may not function properly.

  • Page 6: Wiring Diagram

    WIRING DIAGRAM CN5 CN4 CN2 CN3 Connector Ass’y P/N: 6631T11012N - 6 -...

  • Page 7: Disassembly

    DISASSEMBLY 1. TILT/SWIVEL & BACK COVER REMOVAL (1) Remove two screws (a). (2) Remove the Tilt/swivel. Back Cover (3) Remove two sheets. (3) Remove two screws (b) from the Back Cover. (4) Release six latchs (c). (5) Remove the Back Cover. M IC M IC D IO...
  • Page 8 3. MAIN PCB ASS’Y & CONTROL PCB , SOUND ASS’Y REMOVAL (1) Disconnect J4,J5 and J10 from the Main PCB Ass’y. (2) Remove six screws (a). (3) Remove the Main PCB Ass’y. (4) Remove three screws (b). (5) Disconnect J4 and J3 from the Sound Ass’y (6) Remove the Speaker PCB Ass’y.
  • Page 9 6. INVERTER ASS’Y REMOVAL (1) Disconnect CN2,CN3 and CN4,CN5 (2) Remove two screws (a). (3) Remove the Inverter Ass’y. - 9 -...

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 -...

  • Page 11: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Scaler One chip IC(GMZAN1, U3) GMZAN1 (U3) is one chip IC which it supports four internal function blocks of Video Amp, PLL, A/D converter and Video processor. Video signal (0.7Vp.p) clamped through C44, 45, 191 with matching IC’s proper cut off voltage. This signal is processed as a proper 8 bit digital signal by U3°Øs amplifying, phase locking, A/D converting, and scaling operations.

  • Page 12: Adjustment

    ADJUSTMENT All adjustment are thoroughly checked and corrected 2. Adjustment for White Balance when the monitor leaves the factory, but sometimes 1) Display color 0,0 pattern at Mode 12. several minor adjustment may be required. 2) Set External Bright to MAX position and Contrast to Adjustment should be following procedure and after MAX Position.

  • Page 13: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK ADAPTER, AND FIND OUT CHECK J1’S A SHORT POINT VOLTAGE AS OPENING (12V) ? EACH POWER LINE CHECK CHECK U4. U4 PIN 8 VOLTAGE (5V) ? CHECK CHECK L11 U5 Voltage (OPEN CHECK) (5V) ?
  • Page 14 2. NO RASTER (OSD IS NOT DISPLAYED) – INVERTER NO RASTER (OSD IS NOT DISPLAYED) J4 PIN10 CHECK ADAPTER 12V? CHECK MICOM INV J4 PIN5 ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE. J4 PIN1 2. CHECK MICOM DIM-ADJ PORT CHECK PULSE AS CONTACTING SCOPE...
  • Page 15 3. NO RASTER (OSD IS NOT DISPLAYED) – gmzanl NO RASTER (OSD IS NOT DISPLAYED) POWER PINS CHECK U2, U24 3.3V? 1. CHECK PIN141, 142 U3 PIN141, 142 SOLDERING CONDITION OSCILLATE AS 14.3M? 2. CHECK X2 3. TROUBLE IN U3 CHECK U9’S SOLDERING PIN31 IS 65MHz CLOCK? CONDITION AND...
  • Page 16 4. NO RASTER (OSD IS DISPLAYED) – gmzanl NO RASTER (OSD IS DISPLAYED) POWER PIN CHECK U2, U24 3.3V? 1. CHECK PC CHECK 2. CHECK SIGNAL CABLE R,G,B INPUT? U3 PIN 87, 91, 95 & D-SUB CONNECTOR LINE CHECK CHECK H-SYNC LINE H-SYNC INPUT (D-SUB→U6 →U3 U3 PIN 150?
  • Page 17 5. NO SOUND NO SOUND CHECK SPEAKER CHECK SPEAKER ASS’Y? AUDIO PCB CHECK JACK(J7) CHECK INPUT SIGNAL & AUDIO CORD U3(TDA7449) PIN7,8? CHECK MAIN CHECK U3(MICOM) IIC LINE →AUDIO J3 →U3(TDA7449) CHECK INPUT SIGNAL CHECK U3(TDA7449) U1(TDA7496L) PIN4,9? CHECK OUTPUT SIGNAL CHECK U1(TDA7496L) U1(TDA7496L) PIN14,17?

  • Page 18: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. MAIN BOARD (Component Side) C137 C134 L301 C111 C105 C303 BA19 BA20 BA21 BA22 BA24 C213 C260 C200 C238 R148 - 18 -...
  • Page 19 2. MAIN BOARD (Solder Side) C156 R150 R183 R149 R147 C188 C155 C187 R184 R120 C183 C182 C132 C232 C231 C138 C140 C141 C106 C108 - 19 -...
  • Page 20 3. AUDIO BOARD 4. CONTROL BOARD(Component Side) 5. CONTROL BOARD(Solder Side) - 20 -...
  • Page 21 - 21 -...

  • Page 22: Exploded View Parts List

    SPEAKER ASSEMBLY, LM568E T401SX154K14 SPEAKER ASSY 1W 4OHM 6401TZZ025A METAL,FIX SPEAKER (LM568E) 4950TKK337A ADAPTER, AC-DC, ADP-36UB DELTA 12V 3.0A FOR LG 6634TBZ016A SIGNAL CABLE, UL 2990-9C(7.5) DT 1870MM GRAY(85964) LB500 DM 6866TD9001F CORD,A/V, AUDIO UL 2851 #28-2C 1500MM QUARTZ KSD...

  • Page 23: Replacement Parts List

    REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark AL ALTERNATIVE PARTS MODEL: FLATRON LCD 568LM(LM568E-CA) DATE: 2001. 9. 12. MODEL: FLATRON LCD 568LM(LM568E-CA) DATE: 2001. 9. 12. *S *AL LOC.
  • Page 24 MODEL: FLATRON LCD 568LM(LM568E-CA) DATE: 2001. 9. 12. MODEL: FLATRON LCD 568LM(LM568E-CA) DATE: 2001. 9. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION COILs & COREs C137 0CH8107F611 100UF 16V M 85STD(CYL) R/TP C138 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R...
  • Page 25 MODEL: FLATRON LCD 568LM(LM568E-CA) DATE: 2001. 9. 12. MODEL: FLATRON LCD 568LM(LM568E-CA) DATE: 2001. 9. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP R304 0RN1601F409 1.60K 1/6W 1% TA52...
  • Page 26 MODEL: FLATRON LCD 568LM(LM568E-CA) DATE: 2001. 9. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 6210TCE001H HB-1T2012-301JT CERATEC 2012 6210TCE001H HB-1T2012-301JT CERATEC 2012 6210TCE001H HB-1T2012-301JT CERATEC 2012 6210TCE001H HB-1T2012-301JT CERATEC 2012 6210TCE001G HH-1M3216-501 CERATEC 3216MM 6210TCE001G HH-1M3216-501 CERATEC 3216MM 6210TCE001G HH-1M3216-501 CERATEC 3216MM 0TR387500AA...

  • Page 27: Pin Configuration

    PIN CONFIGURATION L4973V3-L4973V5 3.5A STEP DOWN SWITCHING REGULATOR L4973D3-L4973D5 Pin Configuration SYNC SYNC V5.1 V5.1 COMP COMP BOOT BOOT D94IN162A D94IN163A DIP18 SO20 PIN FUNCTIONS PIN DIP-18 PIN SO-20 NAME DESCRIPTION COMP E/A output to be used for frequency compensation A logic signal (active high) disables the device (sleep mode operation).
  • Page 28 TDA7496L SGS-THOMOSN 2W+2W AMPLIFIER WITH DC VOLUME CONTROL Pin Configuration PIN CONNECTION OUTL VAROUT_L VOLUME VAROUT_R OUTR N.C. MUTE STBY Powerdip(14+3+3) ORDERING NUMBER: TDA7496L D97AU597A BLOCK DIAGRAM VAROUT_R 15,16 1,2,3,13, 18,19,20 VOLUME 1000m F 470nF OUTR OP AMP S1 ST-BY STBY S_GND MUTE/STBY...
  • Page 29 TDA7449 SGS-THOMOSN TONE CONTROL DIGITALLY CONT. AUDIO PROCESSOR Pin Configuration PIN CONNECTION CREF PGND DIG_GND ROUT TREBLE(R) LOUT TREBLE(L) R_IN2 BIN(L) BOUT(L) R_IN1 L_IN1 BOUT(R) DIP20 BIN(R) L_IN2 MUXOUT(L) MUXOUT(R) D98AU848 ORDERING NUMBER: TDA7449 BLOCK DIAGRAM MUXOUTL TREBLE(L) BIN(L) BOUT(L) L-IN1 100K L-IN2...
  • Page 30 TYPE PARTS TYPE PARTS Regulator Transistor KA78M08R KSC1623 1. BASE 1. INPUT 2. EMITTER 2. GND 3. COLLECTOR 3. OUTPUT KIA7042 - 30 -...

  • Page 31: Schematic Diagram

    SCHEMATIC DIAGRAM 1. GMZAN1 - 31 -...
  • Page 32 2. LVDS - 32 -...
  • Page 33 3. MICOM - 33 -...
  • Page 34 4. POWER - 34 -...
  • Page 35 5. CONNECTOR & JACKS - 35 -...
  • Page 36 6. AUDIO - 36 -...
  • Page 37 7. CONTROL KEY - 37 -...

  • Page 38: Packing And Accessories

    PACKING AND ACCESSORIES Owner’s Manual Signal Cable Power Cord Adaptor A/V CORD Left Packing Right Packing AUTO MUTE MENU - 38 -...
  • Page 39 Sep. 2001 P/NO : 3828TSL072B Printed in Korea...

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