Related Manuals for Daewoo L500B1
Summary of Contents for Daewoo L500B1
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Page 1: Service Manual
Service Manual XGA COLOR MONITOR Model : L500B1 DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr November, 2000... -
Page 2: Table Of Contents
CONTENTS SAFETY PRECAUTIONS GENERAL SAFETY INFORMATION SERVICING PRECAUTIONS TECHNICAL INFORMATION GENERAL INFORMATION PIN CONNECTOR CAUTIONS FOR ADJUSTMENT AND REPAIR OPERATION & ADJUSTMENT ALIGNMENT PROCEDURE TROUBLESHOOTING HINTS BLOCK DIAGRAM PCB LAYOUT SCHEMATIC DIAGRAM EXPLODED VIEW & MECHANICAL PARTS LIST INFORMATION OF PART DESCRIPTION ELECTRICAL PARTS LIST... -
Page 3: Safety Precautions
X-Ray, shock, fire or other hazards. Do not modify the original design without getting written permission from DAEWOO ELECTRONICS CO. or this will void the original parts and labor warranty. X-Ray WARNING: The only potential source of X-Ray is the picture tube. -
Page 4: General Safety Information
GENERAL SAFETY INFORMATION 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. 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, please 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 Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components are commonly called Electrostatically Sensitive (ES) Devices. The typical examples of ES devices are integrated circuits, some field-effect transistors, and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
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Page 7: Small-Signal" Discrete Transistor Removal/Replacement
FIGURE 1. USE SOLDERING IRON TO PRY LEADS 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: Technical Information
Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as possible to diode body. 2. Bend the two remaining leads perpendicularly to the circuit board. 3. Observing diode polarity, wrap each lead out of the new diode around the corresponding lead on the circuit board. -
Page 9: General Information
GENERAL INFORMATION This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 62KHz, and all vertical 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 5Vdc Arrangement of 15-pin D-sub connector GND - H.Sync GND - V.Sync Bi-directional Data (SDA) Horizontal Sync Vertical Sync (VCLK) Data Clock (SCL) CAUTIONS FOR ADJUSTMENT AND REPAIR •... -
Page 11: Operation & Adjustment
OPERATION & ADJUSTMENT Control Panel AUTO EXIT MENU BRIGHTNESS AUTO • The AUTO button launches the AUTO TRACKING function directly. EXIT • The EXIT button turns the OSD (On-Screen Display) window off. • This button moves from sub menu to top menu in the OSD window. •... - Page 12 Key Process MENU MENU MENU EXIT EXIT EXIT OSD OFF...
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Page 13: Adjustment Procedure
Adjustment Procedure Is the mode 1024x768? Adjust the SCREEN. Is the H.Size Adjust the CLOCK proper? control. Perform the AUTO POSITION. Is the noise displayed on the screen? Perform the AUTO TRACKING. Is the noise displayed on the screen yet? Adjust the CLOCK until the screen is... -
Page 14: Osd Functions
OSD Functions ICON CONTROL FUNCTIONS Select language for OSD (5 languages). LANGUAGE CLOCK Adjust the width (horizontal size) of the screen image. Sharpen the focus by aligning the illuminated pixels and adjust until the screen image looks focused, crisp and sharp. Adjusting the CLOCK FINE CLOCK after the... -
Page 15: Self Diagnosis
Self Diagnosis When the monitor doesn’t display, if you press any key, Self Diagnosis screen is displayed. Self Diagnosis function checks if the status of the monitor is No Signal or Out of range. No Signal screen is displayed when the D-Sub signal connector is not connected or the status of the monitor is on DPMS mode. -
Page 16: Alignment Procedure
ALIGNMENT PROCEDURE 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 75 terminal positive polarity Synchronizing : acceptable negative or positive at TTL level Resolution Horizontal : 1024 max. -
Page 17: Troubleshooting Hints
TROUBLESHOOTING HINTS 1. Abnormal mode detect Abnormal mode detect Is a input Trouble in the H-sync H-sync of ADC input circuit. correct? Is waveform Trouble of pin 84 of ADC in ADC. correct? Trouble in Scalier. - Page 18 2. Trouble in Power on Refer to No video Is Power LED or No raster. on or off? Check the output Trouble voltage in the adapter. of adapter. Is the pulse Trouble in U3 & Q1 of pin 7 and its ambient circuit. -com.
- Page 19 3. No Raster Check the Trouble in Q6 or output of Q6 or pin 3 of -com. pin 3 of CN2. < 2.5 > 2.5 Is 12V Check 12V plugged in pin 1 line of CN3. of CN2? Is the output of Replace the inverter.
- Page 20 4. One color is missing One color is missing Check the output Is the OSD color signal of Scalier. normal? Is the input Check the video signal signal normal? cable or R,G,B con-ass’y. Are the R,G,B Digital values Check the ambient (every eight bits) correct circuit of ADC.
- Page 21 5. No Video Has display image Next page. only white? Is pin 41 cable of CN6 Connection trouble. well connected? Is pin 1 Check Q16, its ambient of Q16 3.3V? circuit and pin 26 of -com. Check the output of scalier (pin 70, 99, 100, 101) and soldering of CN6.
- Page 22 5-1. No Video Black (3) No raster Is OSD normal? or Check SDRAM. Set the contrast Is the contrast up to Max. at its maximum? Is the output of Is the input of ADC correct? ADC correct? Replace the main board Check the video Next Page.
- Page 23 6. Broke graph Is clock Check Scalier of SDRAM pin 35 pin 135. correct? Is 3.3V plugged in Check 3.3V line. VCC pin of SDRAM? After checking the soldering between SDRAM and Scalier, if O.K., replace the SDRAM.
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Page 25: Pcb Layout
PCB LAYOUT Main PCB Component Side... - Page 26 Main PCB Solder Side...
- Page 27 Control PCB Component Side Control PCB Solder Side...
- Page 28 D-sub PCB Component Side D-sub PCB Solder Side...
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Page 29: Schematic Diagram
SCHEMATIC DIAGRAM... -
Page 30: Exploded View & Mechanical Parts List
EXPLODED VIEW & MECHANICAL PARTS LIST... -
Page 31: 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 Tolerance ± 1% ± 5% ± 10% ±... -
Page 32: Electrical Parts List
ELECTRICAL PARTS LIST The components identified by mark have special characteristics important for safety and x-ray radiation. 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 00030 9970800035 CABLE SIGNAL AS 15P+15P/DDC=1.5M(GY275A) HCFK104ZBA C CHIP CERA... - Page 33 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608 HFFTB2601B COIL CHIP BEAD TB321611Z260 HCBK223KBA C CHIP CERA 50V X7R 0.022MF K 1608 HFFTB2601B COIL CHIP BEAD TB321611Z260 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608 HFFTB2601B COIL CHIP BEAD TB321611Z260...
- Page 34 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC HRFS105JBA R CHIP 1/16 1M OHM J 1608 HRFS101JBA R CHIP 1/16 100 OHM J 1608 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608 HFFH4H300E COIL CHIP BEAD HB-4H3216-300JT HRFS000JBA R CHIP 1/16 0 OHM J 1608 RP10 HFFH4M121E COIL CHIP BEAD...
- Page 35 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC 1LM2596S33 IC SD REGULATOR LM2596S3.3 9979300501 SOCKET IC SDIF-42T(1.778) 5S50101Z10 SW TACT KPT-1115AM 1EM636165T IC SDRAM EM636165TS-8 5S50101Z10 SW TACT KPT-1115AM 1EM636165T IC SDRAM EM636165TS-8 5S50101Z10 SW TACT KPT-1115AM 124C08---- IC EEPROM 24C08 5S50101Z10 SW TACT KPT-1115AM 1KA7542---...
- Page 36 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : "DAEWOOELEC" E-mail : G7F00E@web.dwe.co.kr TEL : 82-32-510-7620 FAX : 82-32-510-7630...