LG Flatron L1720B Service Manual
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LG Flatron L1720B Service Manual

Color monitor
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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. :
MODEL:
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CL-43
L1720B
(L1720BL-AL**R)

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Summary of Contents for LG Flatron L1720B

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-43 MODEL: L1720B (L1720BL-AL**R) CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............10 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......11 TIMING CHART ............4 PRINTED CIRCUIT BOARD........15 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW...........17 WIRING DIAGRAM ..........6 REPLACEMENT PARTS LIST .......19 BLOCK DIAGRAM ........... 7 SCHEMATIC 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 << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Total Period Video Active Time Front Porch Sync Duration Back Porch Sync Mode Resolution Frequency Clock Polarity Sort 31.469 640x350 25.175 70Hz...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW D-sub Connect Power Connect See front control panel Front Control Panel 1. Power Button 3. Menu Button Use this button to turn the display on or off. Use this button to enter or exit the On Screen <Power (DPMS) Indicator>...

  • Page 6: Wiring Diagram

    Connector Ass’y : P/N: 6631T11016C J702 Connector Ass’y : P/N: 6631T20023A J707 Connector Ass’y : P/N: 6631T20024C Connector Ass’y : P/N: 6631T20008G...

  • Page 7: Block Diagram

    LCD Module LVDS R,G,B (Low Voltage differential Differential Signaling) 3.3V 2.5V Reg. Reg. 2.5V 3.3V 2.5V MTV312 MST9111 Micom including 3.3V (ADC/LVDS/SCALER ) LIPS AC Input R,G,B, H/V Sync D-SUB...

  • Page 8: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Video Controller Part & Display Data Transmitter Part.(MST9111) 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.

  • Page 9: Lips Board Block Diagram

    LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC INPUT RECTIFIER ENERGY OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLECTI CONTROL COUPLER CIRCUIT ISOLATION PRIMARY SECONDARY 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.

  • Page 10: 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 11: Service Osd

    Video Signal Compatible PC Generator PARALLEL PORT Power inlet (required) 4.7K Power Select Switch 4.7K (110V/220V) 74LS06 Power LED 4.7K 74LS06 ST Switch V-Sync On/Off Switch (Switch must be ON.) Figure 1. Cable Connection SERVICE OSD - When entering Service mode: You can check the OSD as described below by pressing down the power key and the menu key while the power is off.

  • Page 12: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, AND FIND CHECK J705 OUT A SHORT POINT VOLTAGE PIN5, PIN6 (5V)? AS OPENING EACH POWER LINE CHECK CHECK 5VS LINE U501 PIN 8 Voltage (OPEN CHECK) (5V) ? NO PROBLEM CHECK KEY CONTROL...
  • Page 13 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) J705 PIN5, PIN 6 CHECK LIPS CHECK MICOM INV J705 PIN9 ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE. J705 PIN10 2. CHECK MICOM DIM-ADJ PORT CHECK PULSE AS...
  • Page 14 3. NO RASTER (OSD IS NOT DISPLAYED) – MST9111 NO RASTER (OSD IS NOT DISPLAYED) U201 POWER PIN 8,114 CHECK U804 3.3V? 1. CHECK PIN122, 123 U201 SOLDERING CONDITION PIN122, 123 OSCILLATE AS 2. CHECK X501 12MHZ? 3. TROUBLE IN U201 U501 PIN43 IS 48KHz H-SYNC? CHECK CONNECTION LINE...

  • Page 15: Printed Circuit Board

    4. TROUBLE IN DPM TROUBLE IN DPM CHECK CHECK PC R734, R741 PC IS NOT GOING (SYNC) ? INTO DPM OFF MODE CHECK TROUBLE IN U501 PIN 24 SIGNAL CABLE (0V) ? TROUBLE IN PC...
  • Page 16 R524 R724 R707 R523 R723 C707 R726 R727 R551 R540 R703 R701 R706 R722 C505 ZD701 D702 D701 R528 C703 R725 R529 R716 R531 R520 R525 C714 R530 C712 C201 R580 C203 C202 R570 R571 R509 Q702 C215 C211 R205 R593 R592 C513...

  • Page 17: Exploded View

    EXPLODED VIEW...

  • Page 18: Exploded View Parts List

    LCD(LIQUID CRYSTAL DISPLAY) LM170E01-A4 LG PHILPS TFT COLOR 17" TFT LCD 6304FLP058A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5K6 LG PHILPS TFT COLOR LVDS SXGA OKY GATE D-IC or 6304FLP086A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A4K4 LG PHILPS TFT COLOR SXGA LVDS OKI GATE D-IC...

  • Page 19: 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: 2003. 6. 14. DATE: 2003. 6. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 20 DATE: 2003. 6. 14. DATE: 2003. 6. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R204 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP R751 0RJ1001D677 1K OHM 1/10 W 5% 1608 R/TP R205 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP...
  • Page 21 MST9111 DUAL MSTAR 128P PIN DIAGRAM AVSS_PLL AVSS Pin 1 AVSS LVB0M LVB0P AVDD GNDP VDDP LVB1M AVSS LVB1P LVB2M LVB2P AVDD LVBCKM REXT LVBCKP AVDD_PLL LVB3M AVSS_PLL LVB3P AVDD VDDC AVSS GNDC GNDP VDDP LVA0M LVA0P LVA1M LVA1P LVA2M BIN0M LVA2P BIN0...

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