Daewoo 432X Service Manual
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Daewoo 432X Service Manual

Daewoo 432X Service Manual

Xga color monitor
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Service Manual
XGA COLOR MONITOR
Model : 432X / 523X
DAEWOO ELECTRONICS CO., LTD
OVERSEAS SERVICE DEPT.

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Summary of Contents for Daewoo 432X

  • Page 1 Service Manual XGA COLOR MONITOR Model : 432X / 523X DAEWOO ELECTRONICS CO., LTD OVERSEAS SERVICE DEPT.

  • 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 REPLACEMENT PARTS LIST PARTS LIST...

  • 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 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, 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 commonly are called Electrostatically Sensitive (ES) Devices. The examples of typical 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 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 120Hz. 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 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 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: Hot Key

    Key Process MENU Start • When you choose the icon on the OSD window, you can exit the OSD screen. Hot Key BRIGHTNESS CONTRAST...

  • Page 13: Osd Functions

    OSD Functions ICON CONTROL FUNCTIONS Adjust the left and right margins for more convex or more concave margins. PINCUSHION Adjust the trapezoid of the screen by moving the lines inward or outward. TRAPEZOID Adjust the rotation when the screen is tilted left or right (Optional). ROTATION H.

  • Page 14: 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 75Ω terminal positive polarity Synchronizing:TTL level Negative/Positive Separate Deflection frequency Horizontal Frequency : 30KHz - 54KHz Vertical Frequency : 50Hz - 120Hz Pre-Adjustment 1.
  • Page 15 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 16: Troubleshooting Hints

    TROUBLESHOOTING HINTS 1. No Character No Character Are the Contrast & Change the Contrast & Brightness Controls in Brightness control value to OSD menu maximum maximum? Is whole Refer to No Raster screen bright? No Raster Is CRT Check the peripheral circuit Cathode (Rk, Gk, Bk) of CRT signal level...
  • Page 17 2. No Raster No Raster Is Heater Is CRT Trouble in Voltage (CRT PWB) heater red-hot? about 6V? Increase the Brightness Trouble in Refer to trouble in & Contrast control level power supply power supply unit. circuit fully Maximum Is whole Trouble in video screen bright? circuit...
  • Page 18 3. A Missing Color One color is missing Is input signal Check video signal normal? cable or video card. 0.7Vpp Is the output of Trouble in IC801 or its pre-amp IC801 ambient circuit pin 15, 19, 22 all normal? Is video Trouble in output Q801, Q831, Q861 Cathode (Rk, Gk, Bk)
  • Page 19 4. Abnormal OSD Font Abnormal OSD Font * If menu key selected. Is menu key the Fast Trouble in selected? Blanking signal IC204 or its Is OSD Font (IC204 pin 20) ambient circuit exist? normal? Trouble in One color is IC801 and its missing ambient circuit...
  • Page 20 5. Horizontal Output Circuit MODE B+ Voltage Trouble in Horizontal 72Vdc output circuit Super VGA 86Vdc (No Raster) 54KHz 124Vdc Refer to trouble Trouble in power B+ line boltage in power supply supply circuit normal? unit Q506 base Trouble in FBT waveform normal? 14.5Vp-p...
  • Page 21 6. Unstable Picture 6-1. Horizontal Unstable picture Is the Trouble in IC501 pulse of pin 15 of or its ambient the IC501 circuit correct? Is the pulse of pin 33 of Check IC501 and the IC201 its ambient circuit correct? 5Vpp Is the Check IC201 and...
  • Page 22 6-2. Vertical Unstable picture Is the 15Vdc Refer to P. S. U line voltage is correct? Is the pulse of pin 4, 6 of Trouble in the IC401 vertical D. Y correct? 40Vp-p Is the output Check IC401 and of pin 12,13 of IC501 its ambient circuit all normal? Check the IC501 and...
  • Page 23 7. Focus Monitor remains unfocused Check Focus VR in focus acceptable? Trouble in Focus circuit (FBT)
  • Page 24 8. Convergence Poor convergence convergence Adjust static on the center area convergence bad? Refer to Adjustment procedure of convergence convergence on the Adjust D.Y Location fringe area bad?

  • Page 25: Horizontal Size

    9. Abnormal Picture At first, adjust controls in the OSD Menu 9-1. Horizontal Size Abnormal H.Size Check the Q519, the DC level the DC level Q520 and its of the base of Q521 of C221 ambient circuit changeable? changeable ? Is the collector pulse Check the IC201 and...

  • Page 26: Vertical Size

    9-2. Vertical Size Abnormal V.Size the DC Check the IC201 voltage of C219 and its changeable ? ambient circuit Trouble in Vertical Output Circuit Refer to Vertical Output circuit...
  • Page 27 10. Side-Pincushion Circuit Pincusion distortion is excessive or barrel Select the pincushion icon in OSD menu, and adjust acceptable position. Is the Check the Q518, Q522 waveform of IC501 and its ambient circuit (pin 11) correct? Check the IC501 and its ambient circuit...
  • Page 28 11. Power Supply Unit (P.S.U) Trouble in P.S.U power switch Switch on Check the power cord outlet fuse F001 and diode D001,D002,D003,D004 O.K? Is the IC001 Replace IC001 O.K? Trouble in diode voltage of D002 D001,D002,D003,D004 130V (270V)? or peripheral device Trouble in switching Is the power transformer T001...
  • Page 29 Is voltage Trouble in D104, T001 of C108 35Vdc? Trouble in D106, voltage of IC103 Q103, Q104, IC103 pin3 12Vdc? Is voltage Trouble in IC102 of IC102 pin 3 D103 5Vdc? P.S.U O.K...

  • Page 30: Block Diagram

    BLOCK DIAGRAM CONTRAST CLAMP R/B GAIN F-BLK R/G/B OSD V -I H -I...

  • Page 31: Pcb Layout

    PCB LAYOUT Main PCB Component Side...
  • Page 32 Main PCB Solder Side...
  • Page 33 Video PCB Component Side Video PCB Solder Side...

  • Page 34: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 38: Exploded View Diagram

    EXPLODED VIEW DIAGRAM...

  • Page 39: Replacement Parts List

    REPLACEMENT PARTS LIST 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% ± 20% ±...

  • Page 40: Parts List

    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 0001 9979800483 PCB MAIN CMC-432X T=1.6*246*310 C214 HCZK104ZCA C CHIP CERA 50V Z5U 0.1MF Z 2012 0001 9979800484 PCB CRT CMC-432X T=1.6*136*105 C215...
  • Page 41 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC C514 CMXM2A104J C MYLAR 100V 0.1MF J (TP) C867 CXCH1H220J C CERA 50V CH 22PF J (TAPPING) C515 HCZK104ZCA C CHIP CERA 50V Z5U 0.1MF Z 2012 C868 CEXF2A100V C ELECTRO 100V RSS 10MF (6.3X11) TP C516 CCXB2H102K C CERA...
  • Page 42 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC D508 DFMP2FUR-- DIODE FMP-2FUR F001A 9977410900 FUSE CLIP BSP3-H T0.4 SN 5.2 D509 DZN4148--- DIODE 1N4148 AUTO 52MM F001B 9977410900 FUSE CLIP BSP3-H T0.4 SN 5.2 D510 DD1NL20U-- DIODE D1NL20U IC001 1STRF6653- IC POWER STR-F6653 D511 DZN4148---...
  • Page 43 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC Q511 TKTC3200Y- KTC3200Y R111 RD-AZ102J- R CARBON FILM 1/6 1K OHM J Q512 T1RF630A-- IRF630A R112 RD-AZ102J- R CARBON FILM 1/6 1K OHM J Q513 TKTC3200Y- KTC3200Y R120 RN-AZ1503F R METAL FILM 1/6 150K OHM F Q514 T1RF630A-- IRF630A...
  • Page 44 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R255 HRFT562JCA R CHIP 1/10 5.6K OHM J 2012 R511 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R256 HRFT105JCA R CHIP 1/10 1M OHM J 2012 R512 HRFT393JCA R CHIP 1/10 39K OHM J 2012 R257 RD-AZ511J- R CARBON FILM...
  • Page 45 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R572 RD-AZ563J- R CARBON FILM 1/6 56K OHM J R844 RD-4Z220J- R CARBON FILM 1/4 22 OHM J R573 HRFT622JCA R CHIP 1/10 6.2K OHM J 2012 R845 RC-2Z470J- R CARBON COMP 1/2 47 OHM J R574 HRFT203JCA R CHIP...
  • Page 46 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPOGU, SEOUL, KOREA. C.P.O. BOX 8003 SEOUL KOREA TELEX: DWELEC K28177-8 CABLE: "DAEWOOELEC" FAX: 02) 590-6291 TEL: 02) 360-7114/590-6151~5 http://www.dwe.daewoo.co.kr PRINTED DATE:JUNE.1999...

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523x

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