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2. No Raster No Raster Is Heater Yes Is CRT No Trouble in Voltage (CRT PWB) heater red-hot? CRT about 6V? Yes No Turn the Brightness Trouble in Refer to trouble in & Contrast control power supply power supply unit. to set Maximum circuit Yes Is whole No Trouble in power screen bright? supply circuit Yes Check No Trouble in G1 G1 voltage about line -60V? Yes Is CRT No Trouble in FBT or its G2 (screen) voltage pin4 ambient circuit about 730V? Yes Trouble in 100Vdc Is 100Vdc No Refer to trouble l
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3. A Missing Color One color is missing No Is input signal Check video signal normal? cable or video card. 0.7Vpp Yes Is the output of pre-amp No Trouble in IC801 or its (IC801,TDA9210) ambient circuit pin 14, 16,18 all normal? Yes Is video CRT No No output IC802 Cathode (Rk, Gk, Bk) Trouble in waveform normal? is normal? RK, GK, BK video output About 40V p-p IC802 or ambient Yes Yes Each grid (G1, G2) Trouble in 100Vdc voltage normal? line Yes No Trouble in G1,G2 line Replace CRT 17
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Service Manual
XGA COLOR MONITOR
Model : 531X
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr September, 2000
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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 AND ADJUSTMENT 9 ALIGNMENT PROCEDURE 12 TROUBLESHOOTING HINTS 15 BLOCK DIAGRAM 29 PCB LAYOUT 30 SCHEMATIC DIAGRAM 33 EXPLODED VIEW DIAGRAM 37 INFORMATION OF PART DESCRIPTION 38 ELECTRICAL PARTS LIST 39
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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 this analog color display because of the high voltages used in the deflection circuits. These voltages are exposed in such areas as the associated flyback and yoke circuits. Fire & Shock Hazard • Insert an isolation transforme
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4. Abnormal OSD Font Abnormal OSD Font * If menu key selected. Is menu Is Heater Trouble in No No key selected? Voltage about 6V? Heater voltage Is OSD Font line. exist? Refer to trouble in P.S.U Yes Yes One color is Troubie in missing IC803 or its ambient circuit Yes Is the Trouble in IC204 No output of IC204 and its ambient (pin 13, 14, 15) circuit normal? Yes Refer to Missing Color 18
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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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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. Solder each device lead and then clip off excess lead. 6. Replace heatsink. 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
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GENERAL INFORMATION This color monitor automatically scans all horizontal frequencies from 30KHz to 54KHz, and all vertical frequencies from 50Hz to 160Hz. This color 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, 8514/A, Super VGA, VESA and XGA and Apple Macintosh Video Card). And so, this color monitor has a maximum horizontal resolution of 1024
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PIN CONNECTOR Pin Signal 1 1 Red 2 Green 3 Blue 4 GND 6 10 5 GND 6 GND - Red 15 7 GND - Green 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 th
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OPERATION AND ADJUSTMENT Control Panel • Move cursor to the right window on the OSD window. • Increase the value of any selected function. • Move cursor to the left window on the OSD window. • Decrease the value of any selected function. • Launch OSD(On-Screen Display) MENU window. • Move cursor to the high window on the OSD window. • Increase the value of V.size or V.center. • Move cursor to the low window on the OSD window. • Decrease the value of V.size or V.center. 9
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Key Process MENU MENU MENU MENU OSD OFF When you choose the icon on the OSD window, you can exit the OSD screen. • 10
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OSD Functions ICON CONTROL FUNCTIONS PINCUSHION Adjust the left and right margins for more convex or more concave margins. TRAPEZOID Adjust the trapezoid of the screen by moving the lines inward or outward. PARALLELOGRAM Adjust the parallelogram when the screen is leaning left or right. PIN BALANCE Adjust the side balance when the sides of the screen are bowed towards left or right. T. PIN CORNER Adjust the pin corner top when the top sides o
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ICON CONTROL FUNCTIONS H. MOIRE Adjust the horizontal picture moire cancellation. V. MOIRE Adjust the vertical picture moire cancellation. LANGUAGE Select language for OSD (5 languages). RECALL Reset the screen to the Factory Preset Display Settings. 12
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ALIGNMENT PROCEDURE Standard Adjustment Conditions 1. Power source voltage : 100-240Vac 50/60Hz 2. Aging : Take at least 20 minutes warm-up time. 3. Signals Video : Analog 0.7Vpp 75Ω terminal positive polarity Synchronizing : TTL level Negative/Positive Separate Deflection frequency Horizontal Frequency : 30KHz - 54KHz Vertical Frequency : 50Hz - 160Hz Pre-Adjustment 1. B+ Adjustment Adjust 50Vdc ± 0.1Vdc between D102 cathode and ground at 31.5KHz mode, varying VR001. Adjust 59Vdc ± 0.1Vd
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6. Static Convergence Adjustment (a) Apply a magenta cross hatch pattern on display. (b) Adjust the focus from the best over all focus on the display. Also adjust the brightness to the desired condition. (c) Vertical red and blue lines are converged by varying the angle between the two tabs of the 4-pole magnets. (d) Horizontal red and blue lines are converged by varying the tabs together, keeping the angle between them constant. (e) Apply a yellow cross hatch pattern on display. (f) Vertical gr
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TROUBLESHOOTING HINTS 1. No Character No Character Are the Contrast & Change the Contrast & No Brightness Controls in Brightness control value to OSD menu maximum maximum? Yes Is whole No Refer to No Raster screen bright? No Raster Yes Is CRT Yes Check the peripheral circuit Cathode (Rk, Gk, Bk) of CRT signal level Rk, Gk, Bk normal? About 30~35Vpp No Is the output signal of the Yes Check the video output (pin 14, 16, 18) pre-amp circuit and its ambient circuit IC801, normal? No No Is 12V line
