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Service Manual
XGA COLOR MONITOR
Model : L510B1
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr September, 2001
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CONTENTS SAFETY PRECAUTIONS 1 GENERAL SAFETY INFORMATION 2 SERVICING PRECAUTIONS 3 TECHNICAL INFORMATION 6 GENERAL INFORMATION 7 PIN CONNECTOR 8 CAUTIONS FOR ADJUSTMENT AND REPAIR 8 OPERATION & ADJUSTMENT 9 ALIGNMENT PROCEDURE 14 TROUBLESHOOTING HINTS 15 BLOCK DIAGRAM 22 PCB LAYOUT 23 SCHEMATIC DIAGRAM 27 EXPLODED VIEW & MECHANICAL PARTS LIST 29 INFORMATION OF PART DESCRIPTION 30 ELECTRICAL PARTS LIST 31
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SAFETY PRECAUTIONS CAUTION: No modifications of any circuits should be attempted. Service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guidelines. Safety Check Care should be taken while servicing the inverter that generates the high voltage to lighten CCFL of the LCD panel. Fire & Shock Hazard • Insert an isolation transformer between the analog color display and AC power line before servicing the chassis. • When ser
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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 marking or a hazard which is properly included on the equipment itself. WARNING Stateme
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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. General Servicing Precautions 1. Always unplug the AC power cord from the AC power source before:
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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. 1. Immediately before handling any semiconduc
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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. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 on the page under the title of general soldering guidelines. Removal 1. De
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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. 4. Securely crimp each connection and solder it. 5. Inspect the solder joints of the two “original” leads on the circuit board copper side. If they are not shiny, reheat them and apply additional sold
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GENERAL INFORMATION This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 62KHz, and all vertical frequencies from 50Hz to 75Hz. 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). And so, this TFT LCD monitor has a maximum horizontal resolution of 1024 do
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PIN CONNECTOR Pin Signal 1 Red 1 2 Green 3 Blue 4 GND 610 5 GND 6 GND - Red 7 GND - Green 15 8 GND - Blue 9 +5Vdc Arrangement of 15-pin D-sub connector 10 GND - H.Sync 11 GND - V.Sync 12 Bi-directional Data (SDA) 13 Horizontal Sync 14 Vertical Sync (VCLK) 15 Data Clock (SCL) CAUTIONS FOR ADJUSTMENT AND REPAIR • Degaussing is always required when adjusting purity or convergence. • The white balance adjustment has been done by a color analyzer in factroy. The adjustment procedure, described in the
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OPERATION AND ADJUSTMENT Control Panel EXIT BRIGHTNESS AUTO MENU 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. MENU • The MENU button turns the OSD window on. • This button moves from top menu to sub menu in the OSD window. BRIGHTNESS • The button moves cursor to the left or high window in the OSD window. • This button decreases the value
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Key Process MENU MENU UT L TY UT L TY OSD OSD MENU MENU EXIT EXIT UT L TY SHARPNESS SHARPNESS EXIT OSD OFF 10
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Adjustment Procedure No Is the H.Size Adjust the CLOCK proper? control. Yes Perform the AUTO Is the POSITION. No noise displayed on the screen? Yes Perform the AUTO TRACKING. Is the No noise displayed on the screen yet? Yes Adjust the CLOCK FINE until the screen is cleared. Is the Yes No noise displayed on End the screen yet? 11
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OSD Functions ICON CONTROL FUNCTIONS LANGUAGE Select language for OSD (6 languages). CLOCK Adjust the width (horizontal size) of the screen image. Sharpen the focus by aligning the illuminated pixels and adjust until the CLOCK FINE screen image looks focused, crisp and sharp. Adjusting the CLOCK FINE after the CLOCK adjustment will produce a clear screen. AUTO TRACKING Adjust the horizontal & vertical picture image quality and size. Choose different preset color temperatures or set your own cu
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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. Out of Range screen is displayed when the applied frequency is under or over normal range. Normal range (Non-interlaced mode only) H : 30 - 62 KHz V : 50 - 75 Hz 13
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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 75Ω terminal positive polarity Synchronizing : acceptable negative or positive at TTL level a Max. Resolution : 1024 x 768 75Hz Frequency Horizontal : 30KHz - 62KHz Vertical : 50Hz - 75Hz (available only non interlace mode) Adjustment 1. Smart scaling set to 69%. 2. Contrast set to 90% 3. Brightness set to 50% 4. Switching to
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TROUBLESHOOTING HINTS 1. Abnormal mode detect Abnormal mode detect Yes Is a input No Trouble in the H-sync H-sync of ADC(pin 90, input circuit. U2) correct? Yes Is waveform No Trouble of pin 81 of ADC(U2) in ADC. correct? Yes Trouble in Scaler(U1). 15
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2. Trouble in Power on Is the On Refer to No video Power LED toggled or No raster. between on and off? Off Check if the power switch Is the power No is on position and cord well Connect the power connected? cord correctly. Yes Check the No Trouble in U6 & Q5 waveform of pin 7 and its ambient circuit. of -com. Yes Is 5VS line No Check the power board normal(pin 8 of CN2)? (5VS of CN2A). Yes Check on Scaler(U1). 16
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3. No Raster Check the Trouble in Q6 or output of Q2 or pin 3 of -com. pin 3 of U3. < 2.5 > 2.5 Is 12V No plugged in pin 1 Check the output of CN4A(power of D811(power board). board)? Yes Is the output of No Replace the inverter. inverter correct? Yes Replace a LCD panal. 17
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4. One color is missing One color is missing Yes No Check the output Is the OSD color signal of Scaler. normal? Yes Is the input Check the video signal No signal normal? cable or R,G,B con-ass’y. Yes Are the R,G,B Digital values No Check the ambient (every eight bits) correct circuit of ADC. on ADC output stage? Yes Trouble in the soldering of R,G,B data lines from output of ADC to Scaler(U1). 18
