Daewoo L500B Service Manual
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Daewoo L500B Service Manual

Daewoo L500B Service Manual

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Service Manual
TFT LCD MONITOR
Model : L500B
DAEWOO ELECTRONICS CO., LTD
OVERSEAS SERVICE DEPT.

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Summary of Contents for Daewoo L500B

  • Page 1 Service Manual TFT LCD MONITOR Model : L500B DAEWOO ELECTRONICS CO., LTD OVERSEAS SERVICE DEPT.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SAFETY PRECAUTIONS ....................2 GENERAL SAFETY INFORMATION.................. 3 SERVICING PRECAUTIONS ................... 4 GENERAL INFORMATION ..................... 8 PIN CONNECTOR ....................... 9 OPERATION & ADJUSTMENT ..................10 ALIGNMENT PROCEDURE .................... 14 TROUBLE SHOOTING HINTS ..................15 BLOCK DIAGRAM ....................... 22 PCB LAYOUT .......................

  • Page 3: Safety Precautions

    X-radiation, shock, fire or other hazards. Do not modify the original design without getting a written permission from DAEWOO ELECTRONICS CO. or this will void the original parts and labor warranty.

  • Page 4: General Safety Information

    GENERAL SAFETY INFORMATION u Terms in the manual CAUTION Statements identify conditions or practices that could result in damage to the equipment or other property. WARNING Statements identify conditions or practices that could result in personal injury or loss of life. u Terms as marked on equipment CAUTION Statements indicate a personal injury hazard not immediately accessible as one reads the...

  • Page 5: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION Before servicing instruments covered by this service manual, its supplements and addendum, read and follow the SAFETY PRECAUTIONS of this manual. NOTE If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 1 of this manual, always follow the safety precautions. Remember: Safety First.
  • Page 6 SERVICING PRECAUTIONS u Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. The examples of typical ES devices are integrated circuits, some field-effect transistors and semiconductor “chip”...
  • Page 7 SERVICING PRECAUTIONS FIGURE1. USE SOLDERING IRON TO PRY LEADS u IC Removal / Replacement Some utilized chassis circuit boards have slotted (oblong) holes through which the IC leads are inserted and then bent flat against the circuit foil. When holes are slotted, the following technique should be used to remove and replace the IC.
  • Page 8 SERVICING PRECAUTIONS u Power IC, Transistor or Devices Removal / Replacement 1. Heat and remove all solders from the device leads. 2. Remove the heatsink mounting screw (if applicable). 3. Carefully remove the device from the circuit board. 4. Insert new device in circuit board. 5.

  • Page 9: General Information

    GENERAL INFORMATION This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 62KHz, and all verti- cal frequencies from 50Hz to 85Hz. This TFT LCD monitor supports IBM PC, PC/XT, PC/AT, personal System/2 (PS/2), Apple Macintosh, and compatible users crisp text and vivid color graphics display when using the following graphics adapters : (VGA, Super VGA, VESA and XGA and Apple Macintosh Video Card).

  • Page 10: Pin Connector

    PIN CONNECTOR Signal Green Blue GND - Red GND - Green GND - Blue Arrangement of 15-pin D-sub connector +5Vdc GND - H.Sync GND - V.Sync Bi-directional Data (SDA) Horizontal Sync Vertical Sync (VCLK) Data clock (SCL) uCAUTION FOR ADJUSTMENT AND REPAIR w The white balance adjustment has been done by a color analyzer in factroy.

  • Page 11: Operation & Adjustment

    OPERATION & ADJUSTMENT u Control Panel w Move cursor to the right window on the OSD window. w Increase the value of any selected function. w Move cursor to the left window on the OSD window. w Decrease the value of any selected function. w Launch OSD(On-Screen Display) MENU window.
  • Page 12 OPERATION & ADJUSTMENT u Key Process Start w When you choose the icon on the OSD window, you can exit the OSD screen. u Hot Key...
  • Page 13 OPERATION & ADJUSTMENT u Adjustment procedure Is the mode 1024x768? Adjust the FIT SCREEN. Is the H.Size proper? CLOCK Adjust the control. Perform the Is the AUTO POSITION. noise displayed on the screen? Perform the AUTO TRACKING. Is the noise displayed on the screen? CLOCK FINE Adjust the...

  • Page 14: Osd Functions

    OPERATION & ADJUSTMENT u OSD Functions ICON CONTROL FUNCTIONS Select language for OSD (5 languages). LANGUAGE Adjust the width (horizontal size) of the screen image. CLOCK Sharpen the focus by aligning the illuminated pixels and adjust until the CLOCK FINE screen image looks focused, crisp and sharp.

  • Page 15: Alignment Procedure

    ALIGNMENT PROCEDURE u Standard Check point 1. Power source : 100-240Vac 50/60Hz 2. Aging: Take at least 20 minutes warm up time. 3. Signal Video input :Analog 0.7Vpp 75Ω terminal positive polarity Synchronizing : acceptable negative or positive at TTL level Resolution Horizontal : 1024 max.

  • Page 16: Trouble Shooting Hints

    TROUBLE SHOOTING HINTS 1. Abnormal mode detect Abnormal mode detect Check input H. Sync Trouble video input of TDA8752. circuit. Check waveforms of #84 pin Trouble in the TDA8752. of TDA8752 correct? Trouble in the MX88281.
  • Page 17 TROUBLESHOOTING HINTS 2. Trouble in Power on Trouble in power on. Refer to No video Power LED. or No raster. Check output Trouble in adapter. voltage of adapter. Is the 5VS line Trouble in SQ8 and its normal? ambient circuit. Is the pulse of pin9 Trouble in Q7 or its of the IC1?
  • Page 18 TROUBLESHOOTING HINTS 3. No raster No raster. Trouble in the Q10 or Check the output < 2.5V MX88281 (If it's trouble of the Q10 or #3 pin in the MX88282, change of CN1. the main B'D) > 2.5V CN1 #1 pin Check the 12V of the 12V check.
  • Page 19 TROUBLESHOOTING HINTS 4. One color is missing One color is missing. Check the output signal Is OSD color of the MX88281 normal? and 74act573. Is input signal Check video signal cable normal? or video card. Are the R, G, B digital (8 bit) output Replace the main B'D.
  • Page 20 TROUBLESHOOTING HINTS 5. Pre check Pre check Check output Check reset signal Check on/off voltage (#9 pin of micom) and signal of micom. (5V/3.3V/12V). its ambient circuit. Check output Trouble in the Q9 and of Q9. its ambient circuit. Trouble each trouble item. Trouble in the SU1.
  • Page 21 TROUBLESHOOTING HINTS 6. Abnormal video Abnormal video Is LCLK output the Check the output of Is the OSD normal? L1 waveform MX88281. normal? Check the control and Check connection data signal of SDRAM. of 41 pin cable.
  • Page 22 TROUBLESHOOTING HINTS 7. No video No video White Black OUT1 41 pin cable Is OSD normal? Trouble connection. No raster connection check. U8 #2 pin Are the contrast Change the contrast Trouble connection. output 12V check? controls maximum? control value to maximum LVCC 3.3V check Are the video Change the main B'D...

  • Page 23: Block Diagram

    BLOCK DIAGRAM...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM u MAIN88281A...
  • Page 25 SCHEMATIC DIAGRAM u TOP CIRCUIT...
  • Page 26 SCHEMATIC DIAGRAM u BUFFER...
  • Page 27 SCHEMATIC DIAGRAM u POWER DC/DC...
  • Page 28 SCHEMATIC DIAGRAM u MEMORY...
  • Page 29 SCHEMATIC DIAGRAM u MICOM...
  • Page 30 SCHEMATIC DIAGRAM u RGB/SYNC...
  • Page 31 SCHEMATIC DIAGRAM u TDA8752A...

  • Page 32: Exploded View & Mechanical Parts List

    EXPLODED VIEW & MECHANICAL PARTS LIST...

  • Page 33: Information Of Part Description

    INFORMATION OF PART DESCRIPTION Important Safety Notice Components identified with the International Symbol have special characteristics important for safety. When replacing any components, use only manufacturer’ s specified parts. Abbreviation of Description RESISTOR Description Allowance ± ± ± ± ± Example Fig &...

  • Page 34: Electrical Parts List

    ELECTRICAL PARTS LIST The components identified by mark I have special characteristics important for safety and X-ray. These should be replaced only with the types specified in the parts list. PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC AD1 9979720013 ADAPTER POWER ISA50-1 C082 HCFK103ZCA C CHIP CERA 50V Y5V 0.01MF Z 2012...
  • Page 35 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC C120 HCFK474ZCA C CHIP CERA Y5V 50V 0.47MF Z 2012 C273 HCQK102JCA C CHIP CERA 50V CH 1000PF J 2012 C121 HCFK104ZCA C CHIP CERA 50V Y5V 0.1MF Z 2012 HCTBF100MB C CHIP TANTAL 16V 10MF M 3528 TS C122 HCFK104ZCA C CHIP CERA 50V Y5V 0.1MF Z 2012...
  • Page 36 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC DSUB1 9979200209 D-SUB 15P ANGLE 15P DDC BLUE W/IN SCREW TKTC3875SY TR CHIP KTC3875SY(RTK) 5PF1BH471M FILTER LC CFI-06-B-1H-471M TKTC3875SY TR CHIP KTC3875SY(RTK) 1DWM300--- IC MICOM W78E58-24 1K1A7805P1 IC REGULATOR KIA7805API IC1A 9979300500 SOCKET IC WSDIF-40T TKTC3875SY TR CHIP...
  • Page 37 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R801 HRFT750JCA R CHIP 1/10 75 OHM J 2012 SD2 DSK14----- DIODE SCHOTTKY SK14 R811 HRFT750JCA R CHIP 1/10 75 OHM J 2012 SD3 DSK14----- DIODE SCHOTTKY SK14 R821 HRFT750JCA R CHIP 1/10 75 OHM J 2012 HLC220M00E L CHIP COIL 22UH M (BA220)

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