LG LB504N-XL Service Manual
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LG LB504N-XL Service Manual

LG LB504N-XL Service Manual

Flatron l1510p
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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CL-35
FACTORY MODEL: LB504N
MODEL:
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
L1510P
(LB504N-XL)

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Summary of Contents for LG LB504N-XL

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-35 FACTORY MODEL: LB504N MODEL: L1510P (LB504N-XL) CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............13 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......14 TIMING CHART ............4 PRINTED CIRCUIT BOARD........18 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW...........21 WIRING DIAGRAM ..........8 REPLACEMENT PARTS LIST .......23 BLOCK DIAGRAM ........... 9 PIN CONFIGURATION..........28 DESCRIPTION OF BLOCK DIAGRAM....

  • Page 3: Precautions

    PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING 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: 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 REAR VIEW FRONT VIEW See front control panel Power Connector D-Sub Signal Connector DVI-l Connector Front Control Panel 1. Power Button Button Use this button to turn the display on or off. Use these buttons to choose or adjust items in the <Power (DPMS) Indicator>...

  • Page 6: Positioning Your Display

    6. Control Lock(Menu button, button) Press the hold the MENU button and button for You can unlock the OSD controls at any time by 3 seconds: the message “CONTROLS LOCKED” pushing the MENU, button for 3 seconds: appears. the message “CONTROLS UNLOCKED” will appear.

  • Page 7: Usb Connection

    Making use of USB (Universal Serial Bus)* USB (Universal Serial Bus) is an innovation in connecting your different desktop peripherals conveniently to your computer. By using the USB, you will be able to connect your mouse, keyboard, and other to your monitor instead of having to connect them to your computer.

  • Page 8: Wiring Diagram

    Connector the Main PCB Ass’y and Inverter. P902 Connector Ass’y : P/N: 6631T11012R Connector Ass’y : P/N: 6631T20008G Connector Ass’y : J702 J705 P/N: 6631T12002H J501 J704 P902 J702 J501 Connector Ass’y : P/N: 6631T20015P Connector the Control PCB Ass’y and Main PCB Ass’y.

  • Page 9: Block Diagram

    D-Sub 3.3V 3.3V 2.5V MODULE R1/G1/B1 R/G/B ADC IC R/G/B Selection Scaler IC (AD9884) LVDS IC RGB Data (MX88L250EC-X) (BA7657) (THC63LVDM83R) R2/G2/B2 3.3V TMDS Receiver IC Digital (SIL141B) Signal MICOM ( MTV312) Inverter DVI-I 8Pin H1/V1 H/V Selection Gate H2/V2 Regulator SMPS 3.3V...
  • Page 10 Main PCB 64mm Power PCB Inverter 8Pin 44mm Power 5Pin Power 5Pin Regulator MICOM Heat 150 mm sink LCD Module 20 pin 135mm 120mm SMPS Trans Scaler Control R/G/B 6 pin Control IC Selection Heat TMDS sink Receiver D-Sub DVI-I AC Inlet 101mm...

  • Page 11: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Input signal switching part(BA7657). There are two analog inputs which are analog and digital input. They come from each 15 pin D-Sub and 24 pin DVI-I connector. 2. 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.

  • Page 12: Power Block Diagram

    POWER BLOCK DIAGRAM 50 ~ 60Hz 100KHz HVDC INPUT RECTIFIER ENERGY OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFER AND FILTER LINE 100 ~ 240V PWM CONTROL PHOTO-COUPLER SIGNAL CIRCUIT ISOLATION COLLENTION SECONDARY PRIMARY DESCRIPTION OF BLOCK DIAGRAM 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.

  • Page 13: 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 13. 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 14: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER CHECK J704 BOARD, AND FIND VOLTAGE OUT A SHORT POINT PIN1&PIN2(12V) AS OPENING PIN4(5V)? EACH POWER LINE CHECK U502 PIN 8 CHECK U803. VOLTAGE (5V) ? CHECK CHECK 5VS LINE U806 Voltage (OPEN CHECK) (5V) ?
  • Page 15 2. NO RASTER (OSD IS NOT DISPLAYED) – INVERTER NO RASTER (OSD IS NOT DISPLAYED) J705 PIN1 CHECK POWER BOARD 12V? CHECK MICOM INV J705 PIN8 ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE. J705 PIN7 2. CHECK MICOM DIM-ADJ PORT CHECK PULSE AS...
  • Page 16 3. WHITE SCREEN (OSD IS NOT DISPLAYED) WHITE SCREEN (OSD IS NOT DISPLAYED) CHECK U801 PIN 5, 2 U804, U803, U802 U804, U803, U802 POWER PINS 3.3V, 2.5V? 1. CHECK PIN 93, 94 X201 SOLDERING CONDITION OSCILLATE AS 2. CHECK X201 14,3181M? 3.
  • Page 17 4. NO RASTER (OSD IS DISPLAYED) – MX88L295EC NO RASTER (OSD IS DISPLAYED) U201 POWER PIN CHECK U803 3.3V? 1. CHECK PC CHECK 2. CHECK SIGNAL CABLE R,G,B INPUT? D-SUB & DVI-I U102 PIN 7, 15, 22 CONNECTOR LINE CHECK H-SYNC INPUT CHECK H-SYNC LINE U102 PIN 40?
  • Page 19 2. CONTROL BOARD LED1 MODEL:LB500J P/N:6870T436C11 DATA:2002.02.07 3. USB BOARD...
  • Page 20 4. POWER BOARD (Component Side) 5. POWER BOARD (Solder Side)

  • Page 21: Exploded View

    EXPLODED VIEW...
  • Page 22 SAFETY Mark Description Ref. No. Part No. CABINET ASSEMBLY, LB504N BRAND 3090TKL038A DOMESTIC 3091TKL039R LCD(LIQUID CRYSTAL DISPLAY), LM150X06-A3 LG PHILPS TFT COLOR 15.0 INCH 6304FLP025A BACK COVER ASSEMBLY, LB504N 3808TKL029 . 3809TKL026H TILT SWIVEL ASSEMBLY , LB504J . PIVOT&2-HINGE 3043TKK095A...

  • 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 DATE: 2002. 6. 17. DATE: 2002. 6. 17. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 24 DATE: 2002. 6. 17. DATE: 2002. 6. 17. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C613 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R D719 0DS226009AA KDS226 TP KEC SOT-23 80V 30 C701 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R...
  • Page 25 DATE: 2002. 6. 17. DATE: 2002. 6. 17. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q101 0TR162309CA KSC1623 TP SAMSUNG SOT23 NP R510 0RJ4701D477 4.7K OHM 1/10 W 1% 1608 R/TP Q501 0DS301109AA MMBD301LT1 TP MOTOROLA SOT23...
  • Page 26 DATE: 2002. 6. 17. DATE: 2002. 6. 17. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION OTHERs R712 0RJ1001D677 1K OHM 1/10 W 5% 1608 R/TP R713 0RJ4701D477 4.7K OHM 1/10 W 1% 1608 R/TP X201 6202TST001A SX-1 SUNNY ,SMS, 14.31818MHZ...
  • Page 27 DATE: 2002. 6. 17. DATE: 2002. 6. 17. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 140-058E SKHV10910B LGEC NON 12V 20A 0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323 140-058E SKHV10910B LGEC NON 12V 20A 0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323...

  • Page 28: Pin Configuration

    PIN CONFIGURATION MX88L250EC-X, MX88L250EC-S 128p Pin PIXINA0 PIXINA1 PIXINA2 PIXINA3 PIXINA4 PIXINA5 PIXINA6 PIXINA7 PIXINA8 VDDP PIXINA9 MX88L250EC-X (XGA FBL) PIXINA10 PIXINA11 MX88L250EC-S (SXGA FBL) PIXINA12 GNDP PQFP128 PIXINA13 (preliminary) PIXINA14 PIXINA15 VDDP PIXINA16 PIXINA17 PIXINA18 PIXINA19 PIXINA20 PIXINA21 PIXINA22...
  • Page 29 SiI141B Pin Diagram 24-bit Input Data for 1-pixel/clock mode 8-bit Channel 1 Data 8-bit Channel 0 Data 8-bit Channel 2 Data 1-pixel/clock 1-pixel/clock 1-pixel/clock 6-bit Even Channel 1 6-bit Odd Channel 0 6-bit Even Channel 2 Data 2-pixel/clock Data 2-pixel/clock Data 2-pixel/clock OGND OVcc...
  • Page 30 MC74HCT14ADR2 14P BLOCK DIAGRAM PIN CONFIGURATION PIN 14=V PIN 7=GND SN54F86, SN74F86 TOP VIEW - 30 -...
  • Page 31 74F08 TOP VIEW Vcc = Pin 14 GND = Pin 7 - 31 -...

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