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Summary of Contents for Daewoo 526X
- Page 1 Service Manual XGA COLOR MONITOR Model : 526X DAEWOO ELECTRONICS CO., LTD.
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Page 2: Electrostatically Sensitive (Es) Devices
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 3 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.
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Page 4: 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 5: 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 6: 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 7: Operation And Adjustment
OPERATION AND ADJUSTMENT Control Panel SELECT A D J U S T MENU MENU • Launch OSD(On-Screen Display) MENU window. SELECT • Select a sub Menu & function. • Move a sub Menu & function. • Increase the value of any selected function. •... -
Page 8: Key Process
Key Process MENU SELECT MENU MENU MENU OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. -
Page 9: Osd Functions
OSD Functions ICON CONTROL FUNCTIONS Adjust the position of the display horizontally (left or right). H. POSITION V. POSITION Adjust the position of the display vertically (up or down). H.SIZE Adjust the display width (horizontal size). V.SIZE Adjust the display height (vertical size). Adjust the vertical linearity. - Page 10 ICON CONTROL FUNCTIONS Adjust the red gain. RED GAIN Adjust the green gain. GREEN GAIN Adjust the blue gain. BLUE GAIN Adjust the red bias. RED BIAS Adjust the green bias. GREEN BIAS Adjust the blue bias. BLUE BIAS Select language for OSD (5 languages). LANGUAGE Degaussing keeps the monitor free from unwanted magnetism that can result in color DEGAUSS...
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Page 11: 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 - 160Hz Pre-Adjustment... - Page 12 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.
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Page 13: 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 14 2. No Raster No Raster Is Heater Is CRT Trouble in Voltage (CRT PWB) heater red-hot? about 6V? Turn the Brightness Trouble in Refer to trouble in & Contrast control power supply power supply unit. circuit to set Maximum Is whole Trouble in power screen bright? supply circuit...
- Page 15 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 pre-amp Trouble in IC801 or its (IC801, KA2500) ambient circuit pin 21, 24, 26 all normal? Trouble in Is video video output...
- Page 16 4. Abnormal OSD Font Abnormal OSD Font * If menu key selected. Is menu Trouble in Is Heater key selected? Heater voltage Voltage about 6V? Is OSD Font line. exist? Refer to trouble in P.S.U One color is Troubie in missing IC803 or its ambient circuit...
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Page 17: Horizontal Output Circuit
5. Horizontal Output Circuit MODE B+ Voltage Trouble in Horizontal 72Vdc output circuit Super VGA 86Vdc (No Raster) 54KHz 124Vdc Is the B+line voltage Trouble in 175V line. over 175V? Is the H-out waveform of IC501 Trouble in IC501 normal? Is the Gate wave form of Trouble in Q551, Q552... -
Page 18: Unstable Picture
6. Unstable Picture 6-1. Horizontal Unstable picture Is H.Sync Check H.Sync Out of input pin of IC501 Micom or its ambient correct? circuits. Trouble in IC501... - Page 19 6-2. Vertical Unstable picture Is the 12V,-12Vdc Refer to P. S. U line voltage is correct? Is the pulse of pin 5 of Trouble in the IC401 vertical D. Y -10V correct? 50Vp-p Is the output Check IC401 and of pin 4 of IC501 its ambient circuit all normal? Check the IC501 and...
- Page 20 7. Focus Monitor remains unfocused Check Focus VR in focus acceptable? Trouble in Focus circuit (FBT)
- Page 21 8. Convergence Poor convergence convergence Adjust static on the center area convergence bad? Refer to Adjustment procedure of convergence Adjust D.Y convergence on the Location fringe area bad?
- Page 22 9. Abnormal Picture At first, adjust controls in the OSD Menu 9-1. Horizontal Size Abnormal H.Size the DC level the DC level Check IC501 of the base of Q509 of IC501 pin 5 pin 5 changeable? changeable ? Is the collector pulse =1100Vp-p of Q554 correct?
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Page 23: Vertical Size
9-2. Vertical Size Abnormal V.Size Check the IC4 changeable the the 3.5Vdc of pin and its DC voltage of 4 of the IC501? IC401 pin 1? ambient circuit Trouble V.OSC/ Check the IC501 and Deflection Circuit its ambient circuit Refer to V.OSC/Deflection circuit... - Page 24 10. Side-Pincushion Circuit Side-Pincusion distortion is excessive or barrel Select the side-pincushion icon on OSD menu, and adjust acceptable position. Check IC501 or Is the pin 5 their ambient circuit waveform of IC501 (pin 13, 14) correct Trouble in IC501...
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Page 25: Power Supply Unit (Psu)
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 26 Is voltage Trouble in D103 or of C117 14.3Vdc? horizontal Part. Trouble in D643 or vertical voltage of C643 Part. -15Vdc? Is voltage of C112 Trouble in D105 25Vdc? P.S.U O.K...
- Page 27 MAIN BLOCK DIAGRAM VIDEO BLOCK DIAGRAM 15PIN R,G,B RECEPTACLE VIDEO VIDEO D-SUB (02WE4E1) PREAMP OUTPUT (KA2500) (TDA9532) R,G,B BIAS EPROM BRIGHT CONTROL ( 24LC08) SCREEN & FOCUS OSD IC ROTATION (KS2508) (OPTION) DEGAUSSING CIRCUIT H.SYN HIGH VOLTAGE V.SYNC DEGAUSS CONTROL CLAMP&BLANKING PULSE ADJUST...
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Page 30: 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 31: 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 00001 9979800516 PCB MAIN T=1.6*246*310 C206 CEXF1H479V C ELECTRO 50V RSS 4.7MF (5X11) TP... - Page 32 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC C535 CMXA2G474J C MYLAR MPA 400V 0.47MF J C828 CCZB1H391K C CERA 50V B 390PF K C536 CMXM2A223J C MYLAR 100V 0.022MF J TP C829 CCXF1H103Z C CERA 50V F 0.01MF Z (TAPPING) C537 CMYF2D624J C MYLAR 200V MPP 0.62MF J C830 CEXF1C101V C ELECTRO 16V RSS 100MF (6.3X11) TP...
- Page 33 P001 9979500022 RECEPTACLE BNS-02AB2L-1 R101 RD-4Z154J- R CARBON FILM 1/4 150K OHM J 9979800545 PCB CRT T=1.6*61*50 (526X) R102 RS01Z470J- R M-OXIDE FILM 1W 47 OHM J (TAPPING) PR001 DECPAC140M POSISTOR ECPAC140M290 R103 RD-2Z220J- R CARBON FILM 1/2 22 OHM J...
- Page 34 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R114 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R401 RN-AZ1042F R METAL FILM 1/6 10.4K OHM F R115 RD-4Z910J- R CARBON FILM 1/4 91 OHM J R402 RD-AZ332J- R CARBON FILM 1/6 3.3K OHM J R116 RD-4Z471J- R CARBON FILM 1/4 470 OHM J...
- Page 35 SW005 5S50101Z01 SW TACT KPT-1115VM 1C-1P R814 RD-AZ561J- R CARBON FILM 1/6 560 OHM J T001 5RM0000099 TRANS SMPS DMT-526X R815 RD-AZ100J- R CARBON FILM 1/6 10 OHM J T002 5RY0000002 TRANS SYNC DST-603 R816 RD-AZ471J- R CARBON FILM 1/6 470 OHM J...
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