Related Manuals for Daewoo 719B
Summary of Contents for Daewoo 719B
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Page 1: Service Manual
Service Manual XGA COLOR MONITOR Model : 719B 719BF DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr February, 2001... -
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 & MECHANICAL PARTS LIST 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. X-Ray WARNING: The only potential source of X-Ray is the picture tube. -
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.
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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
4. Securely crimp each connection and solder it. 5. Inspect the solder joints of the two “original” leads on the circuit board copper side. If they are not shiny, reheat them and apply additional solder if necessary. TECHNICAL INFORMATION Model 719B 719BF CDT Size 17-inch 17-inch DynaFlat Diagonal visible image area 16.2-inch... -
Page 9: 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 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 719B 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 719BF 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 13: Hot Key
719B Key Process MENU MENU MENU MENU OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. Hot Key BRIGHTNESS CONTRAST... - Page 14 719BF Key Process OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. Hot Key BRIGHTNESS CONTRAST...
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Page 15: 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 parallelogram when the screen is leaning left or right. PARALLELOGRAM Adjust the side balance when the sides of the screen are bowed towards left or right. - Page 16 ICON CONTROL FUNCTIONS STATUS Display horizontal & vertical frequency and polarity. Adjust the horizontal picture moire cancellation. H. MOIRE 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...
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Page 17: Alignment Procedure
ALIGNMENT PROCEDURE Standard Adjustment Conditions 1. Power source voltage : AC 120V, 60Hz/AC 220V, 50Hz. 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/Composite Deflection frequency Horizontal Frequency : 30KHz - 70KHz Vertical Frequency : 50Hz - 160Hz... - Page 18 (h) Select the R, G, B gain on the OSD menu and adjust the key to get the color coordinates in X=0.281±0.02, Y=0.311±0.02. (i) Adjust the sub contrast control to get the screen luminosity to 32Ft/L. 6. Static Convergence Adjustment (a) Apply a magenta cross hatch pattern on display.
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Page 19: Troubleshooting Hints
TROUBLESHOOTING HINTS 1. No Character No Character Are the Change the Contrast & Contrast & Brightness control to Brightness Controls maximum maximum Is whole Refer to No Raster screen bright? No Raster Is CRT Check the peripheral circuit Cathode (Rk, Gk, Bk) of CRT Board signal level Rk, Gk, Bk... - Page 20 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 21 3. A Missing Color One color is missing Check video signal Is input signal cable or video card. normal? 0.7Vpp Is the output of pre-amp Trouble in IC801 or its (IC801, TDA9210) ambient circuit pin 16,18, 20 all normal? Is video Trouble in output IC(IC802, video output...
- Page 22 4. Abnormal OSD Font Abnormal OSD Font * If menu key selected. Is menu Trouble in Is +5V key selected? +5V voltage Voltage about 5V? Is OSD Font line. exist? Refer to trouble in P.S.U One color is Troubie in missing IC803 or its ambient circuit...
- Page 23 5. Horizontal Output Circuit Trouble in Horizontal output circuit (No Raster Is the Trouble in B+ Booster Circuit B+line voltage (Check the B+section of IC501) over 45V? Is the H-out waveform of IC501 Trouble in IC501 normal? Is the Collector wave form of Trouble in Q504 Q504 normal?
- Page 24 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. Is the Check the value of pin 10 of IC501 C513, R522 12V? Trouble in IC501...
- Page 25 6-2. Vertical Unstable or Abnormal picture Check PWR 13V DC line ambient circuit. correct? the output 45Vp-p Check V.DY waveform of IC401 and ambient circuit. (pin 6) normal? Is the output pulse Check the IC401 of IC501 (pin 23) or ambient circuit. normal? Trouble in V.Sync line or IC501 failure.
- Page 26 7. Focus Monitor remains unfocused Check Focus VR in focus acceptable? Trouble in Focus circuit (FBT)
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Page 27: Dynamic Focus
7-1. Dynamic Focus * Check after adjusting the static focus Focus is poor ORION : 300V 120V finely by VR in FBT SAMSUNG : 300V 120V waveform Is the 1. Check the CRT socket waveform of the or connector wire DF pin in FBT 2. - Page 28 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?
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Page 29: Horizontal Size
9. Abnormal Picture 9-1. Horizontal Size Abnormal H.Size When the H.Size on the Check pin 11 of IC501 OSD is changed, is the and its ambient circuit H.size changed? It isn’t out of order. -
Page 30: Vertical Size
9-2. Vertical Size Abnormal V.Size Check the IC401 changeable the the 3.5Vdc of pin DC voltage of and its 23 of the IC501? IC401 pin 6? ambient circuit Check the pin 23 of IC501 Trouble V.OSC/ and its ambient circuit Deflection Circuit Refer to V.OSC/Deflection circuit... - Page 31 10. High Voltage Output Circuit Trouble in H.V circuit (No Raster) Trouble in power B+(45V) line supply circuit voltage normal? Is Q505 Trouble in FBT collector waveform normal? Is IC501 Trouble in IC501 pin 8 ambient circuit normal? Is the Trouble in IC501 IC501 pin15 H.trigger ambient circuit...
- Page 32 11. Side-Pincushion Circuit Side-Pincusion distortion is excessive or barrel Select the side-pincushion icon on OSD menu, and adjust acceptable position. Is the pin 5,10 Check IC803 or waveform of IC803 their ambient circuit correct? Is the Check IC803or waveform of IC803 it’s ambient circuit.
- Page 33 12. 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, O.K? D003, D004, Q001 Trouble in D001, D002, voltage of T001 D003, D004, C004 and pin 7 130V TH001.
- Page 34 Is voltage Trouble in D106 or of C109 13Vdc? horizontal part Trouble in D104 or voltage of C108 vertical part -13Vdc? Is voltage of C106 Trouble in D108 27Vdc? P.S.U O.K...
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Page 35: Block Diagram
BLOCK DIAGRAM... -
Page 36: Pcb Layout
PCB LAYOUT 719B/719BF Main PCB Component Side... - Page 37 719B/719BF Main PCB Solder Side...
- Page 38 719B/719BF CRT PCB Component Side 719B/719BF CRT PCB Solder Side...
- Page 39 719BF Control PCB Component Side 719BF Control PCB Solder Side...
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Page 40: Schematic Diagram
SCHEMATIC DIAGRAM Power & Connection Section... - Page 41 Control & Vert. out Section...
- Page 42 Horizontal Section...
- Page 43 Video Section...
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Page 44: Exploded View & Mechanical Parts List
EXPLODED VIEW & MECHANICAL PARTS LIST 719B 719B... - Page 45 719B 719BF...
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Page 46: Information Of Part Description
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. Parts List for 719B & 719BF PART-CODE PART-NAME PART-DESC... - Page 47 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC C546 CMXM2A682J C MYLAR 100V 6800PF J (TP) C891 CCZB1H221K C CERA 50V B 220PF K C548 CCXF1H104Z C CERA 50V F 0.1MF Z C892 CCZB1H221K C CERA 50V B 220PF K C549 CMXM2A152J C MYLAR 100V 1500PF J (TP) C932 CMXL2E104J C MYLAR MEU 250V 0.1MF J...
- Page 48 DIODE 1N4148 AUTO 52MM P001 9979500022 RECEPTACLE BNS-02AB2L-1 D801 DZN4148--- DIODE 1N4148 AUTO 52MM PCB1 9979800541 PCB MAIN T=1.6*246*247 (719B) D802 DZN4148--- DIODE 1N4148 AUTO 52MM PCB2 9979800543 PCB VIDEO T=1.6*123*95(719B) D803 DZN4148--- DIODE 1N4148 AUTO 52MM PR001 DECPAC140M POSISTOR...
- Page 49 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R001 RC-2Z684J- R CARBON COMP 1/2 680K OHM J R223 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R003 RS01Z513JS R M-OXIDE FILM 1W 51K OHM J SMALL R224 RD-AZ202J- R CARBON FILM 1/6 2K OHM J R004 RS01Z513JS R M-OXIDE FILM 1W 51K OHM J SMALL R225 RD-AZ101J-...
- Page 50 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R521 RD-AZ471J- R CARBON FILM 1/6 470 OHM J R576 RD-AZ223J- R CARBON FILM 1/6 22K OHM J R522 RD-AZ122J- R CARBON FILM 1/6 1.2K OHM J R579 RD-4Z220J- R CARBON FILM 1/4 22 OHM J R523 RD-2Z221J- R CARBON FILM 1/2 220 OHM J...
- Page 51 1/6 3.6K OHM J SW501 5S80303001 SW LEVER P12T21 R890 RD-AZ101J- R CARBON FILM 1/6 100 OHM J T001 5RM0000106 TRANS SMPS DMT-719B R891 RD-AZ101J- R CARBON FILM 1/6 100 OHM J T500 5RH0000120 FBT FFA79014U R892 RD-AZ101J- R CARBON FILM...
- Page 52 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 : djkoo@web.dwe.co.kr...