Daewoo 531X Service Manual
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Daewoo 531X Service Manual

Xga color monitor
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Service Manual

XGA COLOR MONITOR
Model : 531X
Warning
The data contained within this manual may not
reflect your configuration. Please verify this
information matches your model before making
repairs. For Daewoo technical support call
1-800-245-9870.
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
September, 2000

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Summary of Contents for Daewoo 531X

  • Page 1: Service Manual

    Model : 531X Warning The data contained within this manual may not reflect your configuration. Please verify this information matches your model before making repairs. For Daewoo technical support call 1-800-245-9870. DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr September, 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 AND ADJUSTMENT ALIGNMENT PROCEDURE TROUBLESHOOTING HINTS BLOCK DIAGRAM PCB LAYOUT SCHEMATIC DIAGRAM EXPLODED VIEW DIAGRAM 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.

  • 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.

  • 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

    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 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).

  • Page 10: Pin Connector

    PIN CONNECTOR Signal Green Blue GND - Red GND - Green GND - Blue +5Vdc GND - H.Sync GND - V.Sync Bi-directional Data (SDA) Horizontal Sync Vertical Sync (VCLK) Data Clock (SCL) CAUTIONS FOR ADJUSTMENT AND REPAIR • Degaussing is always required when adjusting purity or convergence. •...

  • Page 11: Operation And Adjustment

    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. •...
  • Page 12 Key Process MENU MENU MENU MENU OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen.

  • Page 13: Osd Functions

    OSD Functions ICON CONTROL 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. Adjust the side balance when the sides of the screen are bowed towards left or right.
  • Page 14 ICON CONTROL H. MOIRE Adjust the horizontal picture moire cancellation. Adjust the vertical picture moire cancellation. V. MOIRE Select language for OSD (5 languages). LANGUAGE Reset the screen to the Factory Preset Display Settings. RECALL FUNCTIONS...

  • Page 15: Alignment Procedure

    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 75 terminal positive polarity Synchronizing : TTL level Negative/Positive Separate Deflection frequency Horizontal Frequency : 30KHz - 54KHz Vertical Frequency : 50Hz - 160Hz Pre-Adjustment...
  • Page 16 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.

  • Page 17: Troubleshooting Hints

    TROUBLESHOOTING HINTS 1. No Character No Character Are the Contrast & Brightness Controls in OSD menu maximum? screen bright? Cathode (Rk, Gk, Bk) signal level output signal of the (pin 14, 16, 18) pre-amp IC801, normal? Is 12V line Is blanking pulse (pin 20 of IC801) Is input signal Trouble in IC801 and...
  • Page 18 2. No Raster No Raster Is CRT heater red-hot? Turn the Brightness & Contrast control to set Maximum Is whole screen bright? Check G1 voltage about -60V? Is CRT G2 (screen) voltage about 730V? Is 100Vdc line normal? Does the Brightness control make screen bright? Raster OK...
  • Page 19 3. A Missing Color One color is missing Is input signal normal? 0.7Vpp Is the output of pre-amp (IC801,TDA9210) pin 14, 16,18 all normal? Cathode (Rk, Gk, Bk) is normal? Each grid (G1, G2) voltage normal? Replace CRT Check video signal cable or video card.
  • Page 20 4. Abnormal OSD Font Abnormal OSD Font Is menu key selected? Is OSD Font exist? One color is missing Is the output of IC204 (pin 13, 14, 15) normal? Refer to Missing Color * If menu key selected. Is Heater Voltage about 6V? Troubie in IC803 or its...
  • Page 21 5. Horizontal Output Circuit MODE B+ Voltage 60Vdc Super VGA 72Vdc 54KHz 110Vdc Trouble in Horizontal output circuit (No Raster Is the B+line voltage over 50V? Is the H-out waveform of IC501 normal? Is the Collector wave form of Q504 normal? Is the Drain waveform of Q507 normal?
  • Page 22 6. Unstable Picture 6-1. Horizontal Unstable pulse of pin 26 of the IC501 pulse of pin 28 of the IC201 input H.Sync Trouble in Signal Cable or 15P D-Sub Connector picture Is the Trouble in IC501 or its ambient circuit correct? Is the Check IC501 and...
  • Page 23 6-2. Vertical -10V 50Vp-p Unstable picture Is the 12V,-12Vdc line voltage is correct? Is the pulse of pin 6 of the IC401 correct? Is the output of pin 8 of IC501 all normal? Check the IC501 and its ambient circuit Refer to P.
  • Page 24 7. Focus Monitor remains unfocused Check Focus VR in focus acceptable? Trouble in Focus circuit (FBT)
  • Page 25 8. Convergence Poor convergence convergence on the center area bad? convergence on the fringe area bad? Adjust static convergence Adjust D.Y Location Refer to Adjustment procedure of convergence...

  • Page 26: Horizontal Size

    9. Abnormal Picture 9-1. Horizontal Size Abnormal H.Size the DC level of the base of Q517 changeable? Is the collector pulse =1100Vp-p of Q505 correct? Is the cathode waveform of D509 80-310Vpp correct? Trouble in H.OSC/ Deflection Circuit Refer to Horizontal Output circuit * At first, adjust controls in the OSD Menu the DC level of IC501 pin 11...

  • Page 27: Vertical Size

    9-2. Vertical Size Abnormal V.Size changeable the DC voltage of IC401 pin 1? Trouble V.OSC/ Deflection Circuit Refer to V.OSC/Deflection circuit the 3.5Vdc of pin 21of the IC501? Check the IC501 and its ambient circuit Check the IC401 and its ambient circuit...
  • Page 28 10. Side-Pincushion Circuit Pincusion distortion is excessive or barrel Select the side-pincushion icon in OSD menu, and adjust acceptable position. Is the Check the Base pin 11 waveform of waveform of the Q515 IC501 correct? Trouble in IC501...
  • Page 29 11. Power Supply Unit (P.S.U) Trouble in P.S.U power switch fuse F001 O.K? Is the IC001 O.K? voltage of D002 130V (270V)? Is the waveform of T001 pin5 correct? voltage of C102 100Vdc? voltage of C104 50Vdc? Switch on Check the power cord outlet and diode D001,D002,D003,D004 Replace IC001 Trouble in diode...
  • Page 30 Is voltage of C109 13Vdc? voltage of C108 -12Vdc? Is voltage of C105 8Vdc? P.S.U O.K Trouble in D106 or horizontal part Trouble in D104 or vertical part Trouble in D103...

  • Page 31: Block Diagram

    BLOCK DIAGRAM...

  • Page 32: Pcb Layout

    PCB LAYOUT Main PCB Component Side...
  • Page 33 Main PCB Solder Side...
  • Page 34 CRT PCB Component Side CRT PCB Solder Side...

  • Page 35: Schematic Diagram

    SCHEMATIC DIAGRAM Power & Connection Section...
  • Page 36 Control & Vert. out Section...
  • Page 37 Horizontal Section...
  • Page 38 Video Section...

  • Page 39: Exploded View Diagram

    EXPLODED VIEW DIAGRAM...

  • Page 40: 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 ± 1% ± 5% ± 10% ±...

  • Page 41: Electrical Parts List

    C205 CCXF1H104Z C CERA C208 CCXB1H102K C CERA C209 CCXB1H102K C CERA have special characteristics important for safety and x-ray PART-DESC PART-CODE T=1.6*246*247 (531X) C210 CCXB1H181K C CERA T=1.6*108*82(531X) C211 CCXB1H181K C CERA 3 H05VV-F 3X0.75 1.8 IV C216 CEXF1H100V C ELECTRO...
  • Page 42 PART-CODE PART-NAME C536 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP C538 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP C541 CMXM2A103J C MYLAR 100V 0.01MF J (TP) C542 CMXM2A152J C MYLAR 100V 1500PF J (TP) C543 CEXD1H339W C ELECTRO 50V RHD 3.3MF(16*25) C550 CMXM2A224J C MYLAR 100V 0.22MF J...
  • Page 43 IC501 1TDA4856-- IC H.OSC IC801 1TDA9210-- IC VIDEO PREAMP TDA9210 IC802 1TDA9536-- IC VIDEO OUTPUT TDA9536 L502 5MH0000079 COIL H-LINEARITY TRL-531X L503 5MC0000060 COIL CHOKE L505 5MC0000060 COIL CHOKE L801 5CPZ568K02 COIL PEAKING L831 5CPZ338K02 COIL PEAKING L861 5CPZ568K02 COIL PEAKING...
  • Page 44 PART-CODE PART-NAME R113 RD-AZ562J- R CARBON FILM R202 RD-AZ101J- R CARBON FILM R203 RD-AZ101J- R CARBON FILM R204 RD-AZ202J- R CARBON FILM R205 RD-AZ101J- R CARBON FILM R206 RD-AZ101J- R CARBON FILM R207 RD-AZ103J- R CARBON FILM R208 RD-AZ105J- R CARBON FILM R209 RD-AZ562J- R CARBON FILM R210 RD-AZ562J-...
  • Page 45 KPT-1115VM 1C-1P SW TACT KPT-1115VM 1C-1P SW TACT KPT-1115VM 1C-1P SW TACT KPT-1115VM 1C-1P SW TACT KPT-1115VM 1C-1P SW TACT KPT-1115VM 1C-1P DMT-531X CF1656 DDT-531X THERMISTOR TP8D13 CCT 063BT 2K OHM B TAP CCT 063BT 1K OHM B TAP EFOEC8004T4...
  • Page 46 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...

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532x

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