Related Manuals for Daewoo Lucoms 719B-3
Summary of Contents for Daewoo Lucoms 719B-3
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Page 1: Service Manual
Service Manual XGA COLOR MONITOR Model : 719B-3/719BF-3 DAEWOO LUCOMS CO., LTD. http://www.lucoms.com July, 2003... -
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 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 LUCOMS CO., LTD. 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 SERVICING PRECAUTIONS 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”...
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Page 7: Small-Signal" Discrete Transistor Removal/Replacement
SERVICING PRECAUTIONS 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-3 719BF-3 CDT Size 17-inch 17-inch Flat 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(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 11: Operation And Adjustment
OPERATION AND ADJUSTMENT 719B-3 Control Panel • Move cursor to the right window on the OSD window. • Increase the value of any selected function. • While the OSD screen is off, you can adjust the screen brightness POWER LIGHT according to each situation. - Page 12 OPERATION AND ADJUSTMENT 719BF-3 Control Panel • Move cursor to the right window on the OSD window • Increase the value of any selected function. • While the OSD screen is off, you can adjust the screen brightness according to each situation. •...
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Page 13: Hot Key
OPERATION AND ADJUSTMENT 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 POWER LIGHT GAME MOVIE CONTRAST The screen brightens progressively by 10%. If you carry out general PC works such as document edition on the Movie mode,you may shorten the life span of CRT. - Page 14 OPERATION AND ADJUSTMENT 719BF Key Process OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. Hot Key POWER LIGHT BRIGHTNESS GAME MOVIE The screen brightens progressively by 10%. CONTRAST If you carry out general PC works such as document edition on the Movie mode,you may shorten the life span of CRT.
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Page 15: Osd Functions
OPERATION AND ADJUSTMENT 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 OPERATION AND ADJUSTMENT ICON CONTROL FUNCTIONS Display horizontal & vertical frequency and polarity. STATUS 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 100~240V, 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/Composite Deflection frequency Horizontal Frequency : 30KHz - 70KHz Vertical Frequency : 50Hz - 160Hz Pre-Adjustment... - Page 18 ALIGNMENT PROCEDURE (g) Receive the small square white pattern about 50 x 50mm. (h) Adjust the G-gain control to get the brightness to 50 Ft/L. (i) Adjust the B-gain control to get the y cordinate to 0.311 ± 0.03. (j) Adjust the R-gain control to get the x cordinate to 0.281 ± 0.03. (k) Receive the full white pattern.
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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 TROUBLESHOOTING HINTS 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?
- Page 21 TROUBLESHOOTING HINTS 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 IC201 or its (IC201) pin 19,20,21 ambient circuit all normal? Trouble in Is video video output Cathode (Rk, Gk, Bk)
- Page 22 TROUBLESHOOTING HINTS 4. 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 54V? Is the H-out waveform of IC501 Trouble in IC501 normal? Is the Collector Trouble in Q406 and its waveform of ambient circuit.
- Page 23 TROUBLESHOOTING HINTS 5. Unstable Picture 5-1. 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 29 of IC501 C402, R423. 12~13V? Trouble in IC501.
- Page 24 TROUBLESHOOTING HINTS 5-2. Vertical Unstable or Abnormal picture Check PWR 13V DC line ambient circuit. correct? the output 45Vp-p Check V.DY waveform of IC301 and ambient circuit. (pin 5) normal? Is the output pulse Check the IC301 of IC501 ( pin 13 ) or ambient circuit.
- Page 25 TROUBLESHOOTING HINTS 6. Focus Monitor remains unfocused Check Focus VR in focus acceptable? Trouble in Focus circuit (FBT)
- Page 26 TROUBLESHOOTING HINTS 6-1. 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 27 TROUBLESHOOTING HINTS 7. 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 28: Horizontal Size
TROUBLESHOOTING HINTS 8. Abnormal Picture 8-1. Horizontal Size Abnormal H.Size When the H.Size on the Check pin 24 of IC501 OSD is changed, is the and its ambient circuit H.size changed? It isn’t out of order. -
Page 29: Vertical Size
TROUBLESHOOTING HINTS 8-2. Vertical Size Abnormal V.Size Check the IC301 changeable the the 3.5Vdc of pin DC voltage of and its 23 of the IC501? IC301 pin 5 ? ambient circuit Check the pin 23 of IC501 Trouble V.OSC/ and its ambient circuit Deflection Circuit Refer to V.OSC/Deflection circuit... - Page 30 TROUBLESHOOTING HINTS 9. High Voltage Output Circuit Trouble in H.V circuit (No Raster) Trouble in power B+(54V) line supply circuit. voltage normal? Is Q407 Trouble in FBT. collector waveform normal? Is IC501 Trouble in IC501 pin 26 ambient circuit. normal? Is the Trouble in IC501 IC501 pin 1 H.trigger...
- Page 31 TROUBLESHOOTING HINTS 10. 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 11 Check IC501or waveform of IC501 their ambient circuit correct? Is the Check IC501 or waveform of IC501 it’s ambient circuit.
- Page 32 TROUBLESHOOTING HINTS 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, O.K? D003, D004, Q001 Trouble in D001, D002, voltage of T001 D003, D004, C004 and pin 8 130V TH001.
- Page 33 TROUBLESHOOTING HINTS Is voltage Trouble in D814 or of C827 13Vdc? horizontal part Trouble in D908 or voltage of C908 FBT part. -12Vdc ? P.S.U O.K...
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Page 34: Block Diagram
BLOCK DIAGRAM 719B-3/719BF-3... -
Page 35: Schematic Diagram
SCHEMATIC DIAGRAM 719B-3/719BF-3... -
Page 36: Exploded View & Mechanical Parts List
EXPLODED VIEW & MECHANICAL PARTS LIST 719B 719B-3... - Page 37 EXPLODED VIEW & MECHANICAL PARTS LIST 719B 719BF-3...
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Page 38: 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 39: 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. Parts List for 719B-3 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC BC005 5PB13857—... - Page 40 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC C407 CMXM2A104J C MYLAR 100V 0.1MF J (TP) C913 CMXM2A102J C MYLAR 100V 1000PF J (TP) C408 CMXM2A472J C MYLAR 100V 4700PF J (TP) C915 CEXF1C471V C ELECTRO 16V RSS 470MF (8X12)TP C409 CMXD2A821J C MYLAR...
- Page 41 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC D814 DUG2D——- DIODE UG2D 200V 2A J021 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING D816 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J022 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING D901 DUG1D——- DIODE UG1D...
- Page 42 5MC0000104 COIL CHOKE CH-100 R002 RD-AZ363J- R CARBON FILM 1/6 36K OHM J L901 5MH0000094 COIL H-LINEARITY TRL-719B-3 R003 RS01Z333JS R M-OXIDE FILM 1W 33K OHM J SMALL LED01 DSV50G—— SV50-R32BA570GG(GREEN) R004 RS01Z333JS R M-OXIDE FILM 1W 33K OHM J SMALL...
- Page 43 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R161 RD-AZ122J- R CARBON FILM 1/6 1.2K OHM J R408 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R162 RD-AZ272J- R CARBON FILM 1/6 2.7K OHM J R409 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R163 RD-AZ512J-...
- Page 44 1/2 150 OHM J SW106 5S50101Z01 SW TACT KPT-1115VM 1C-1P R902 RD-2Z151J- R CARBON FILM 1/2 150 OHM J T001 5RM0000119 TRANS SMPS DMT-719B-3 R903 RD-2Z560J- R CARBON FILM 1/2 56 OHM J T401 5RM0000121 TRANS DRIVE DDT-719B-3 R904 RD-4Z331J-...
- Page 45 ELECTRICAL PARTS LIST Difference Components List Between 719B-3 and 719BF-3 719B-3 719BF-3 LOC. Part No. Part Description Part No. Part Description 9979617041 M41KXU200XX021 9979617081 M41QEC200XX021 R468 RD-AZ302J 1/6W 3K ohm RD-AZ222J- 1/6W 2.2K ohm...