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Summary of Contents for Daewoo 531B
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Page 1: Service Manual
Service Manual XGA COLOR MONITOR Model : 531B 532B DAEWOO ELECTRONICS CO., LTD. -
Page 2: General 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 3: 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 4: 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 5: 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 6: General Information
GENERAL INFORMATION This color monitor automatically scans all horizontal frequencies from 30KHz to 70KHz, 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 7: Pin Connector
PIN CONNECTOR Signal Green Blue GND - Red GND - Green GND - Blue +5Vdc (Option) 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 8: Operation And Adjustment
OPERATION AND ADJUSTMENT 531B 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 9 531B Key Process MENU M E N U M E N U U T L T Y MENU E X T U T L T Y D E G A U S S MENU MENU OSD OFF • When you choose the icon...
- Page 10 532B 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. •...
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Page 11: Key Process
532B Key Process MENU M E N U M E N U U T L T Y MENU U T L T Y D E G A U S S E X T MENU MENU OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. -
Page 12: Osd Functions
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. Adjust the side balance when the sides of the screen are bowed towards left or right. - Page 13 ICON CONTROL FUNCTIONS Display horizontal & vertical frequency and polarity. STATUS H. MOIRE Adjust the horizontal picture moire cancellation. V. MOIRE Adjust the vertical picture moire cancellation. Select language for OSD (5 languages). LANGUAGE Reset the screen to the Factory Preset Display Settings. RECALL...
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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 - 70KHz Vertical Frequency : 50Hz - 160Hz Pre-Adjustment... - 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.
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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? 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 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 pre-amp Trouble in IC801 or its (IC801,TDA9210) ambient circuit pin 14, 16,18 all normal? Is video output IC802 Cathode (Rk, Gk, Bk) Trouble in...
- Page 19 4. Abnormal OSD Font Abnormal OSD Font * If menu key selected. Is menu Is Heater Trouble in key selected? Voltage about 6V? Heater voltage Is OSD Font line. exist? Refer to trouble in P.S.U One color is Troubie in missing IC204 or its ambient circuit...
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Page 20: Horizontal Output Circuit
5. Horizontal Output Circuit MODE B+ Voltage 60Vdc Trouble in Horizontal 130Vdc output circuit (No Raster 54KHz 110Vdc Is the B+line voltage Trouble in 50V over 50V? Is the H-out waveform of IC501 Trouble in IC501 normal? Is the Collector wave form of Trouble in Q505 Q504 normal? -
Page 21: Unstable Picture
6. Unstable Picture 6-1. Horizontal Unstable picture Is the Trouble in IC501 pulse of pin 26 of or its ambient the IC501 circuit correct? Is the pulse of pin 28 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 12V,-12Vdc Refer to P. S. U line voltage is correct? Is the pulse of pin 6 of Trouble in the IC401 vertical D. Y -10V correct? 50Vp-p Is the output Check IC401 and of pin 8 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 Adjust D.Y convergence on the fringe area bad? Location...
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Page 25: Horizontal Size
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 Q517 of IC501 pin 11 pin 11 changeable? changeable ? Is the collector pulse =1100Vp-p of Q505 correct? -
Page 26: Vertical Size
9-2. Vertical Size Abnormal V.Size Check the IC401 changeable the the 3.5Vdc of pin DC voltage of and its 21of the IC501? IC401 pin 1? ambient circuit Check the IC501 Trouble V.OSC/ and its ambient circuit Deflection Circuit Refer to V.OSC/Deflection circuit... - Page 27 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...
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Page 28: 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 29 Is voltage Trouble in D106 of C109 13Vdc? or horizontal part Trouble in D104 voltage of C108 or vertical part -12Vdc? Is voltage Trouble in D103 of C105 8Vdc? P.S.U O.K...
- Page 30 TDA9536 RGB H/V (SGS Thompson) CRT : Orion Mini-Neck NT6828 15" (Novatek) H/Def Output H/Linearity TR/Damper Coil NT68P62 C/S Switching TRL-531B (Novatek) KSC5802/ H-Size SDS06F150S TR : BD677A AC INPUT V - Driver (Fairchild) (Fairchild) KA2142B Control (Samsung) H-Driver Drive...
- Page 31 PCB LAYOUT Main PCB Component Side...
- Page 32 Main PCB Solder Side...
- Page 33 CRT PCB Component Side CRT PCB Solder Side...
- Page 34 Power & Connection Section...
- Page 35 Control & Vert. out Section...
- Page 36 Horizontal Section...
- Page 37 Video Section...
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Page 39: 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 Tolerance ± 1% ± 5% ± 10% ±... -
Page 40: 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 9979800540 PCB MAIN T=1.6*246*247 (531X) C209 CCXB1H102K C CERA 50V B 1000PF K (TAPPING) - Page 41 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC C524 CEXF2A331V C ELECTRO 100V RSS 330MF (16X25) TP C833 CCXB1H682K C CERA 50V B 6800PF K (TAPPING) C527 CCXB3A102K C CERA 1KV B 1000PF K (TAPPING) C861 CCXF1H104Z C CERA 50V F 0.1MF Z C528 CMXF2D124J C MYLAR MPP 200V 0.12MF J C862 CCXF1H104Z C CERA...
- Page 42 IC VIDEO PREAMP TDA9210 R013 RD-AZ223J- R CARBON FILM 1/6 22K OHM J IC802 1TDA9536-- IC VIDEO OUTPUT TDA9536 R014 RD-AZ102J- R CARBON FILM 1/6 1K OHM J L502 5MH0000085 COIL H-LINEARITY TRL-531B R015 RS01Z228J- R M-OXIDE FILM 1W 0.22 OHM J...
- Page 43 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R016 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R253 RD-AZ562J- R CARBON FILM 1/6 5.6K OHM J R017 RD-AZ563J- R CARBON FILM 1/6 56K OHM J R255 RD-AZ562J- R CARBON FILM 1/6 5.6K OHM J R018 RD-AZ823J- R CARBON FILM 1/6 82K OHM J...
- Page 44 1/6 18K OHM J SW206 5S50101Z01 SW TACT KPT-1115VM 1C-1P R610 RD-AZ182J- R CARBON FILM 1/6 1.8K OHM J T001 5RM0000109 TRANS SMPS DMT-531B R611 RD-AZ472J- R CARBON FILM 1/6 4.7K OHM J T500 5RH0000129 CF1656 R612 RD-AZ100J- R CARBON FILM...